References of "Michel, Frédéric"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailMarket analysis of recycled sands and aggregates in North-West Europe: drivers and barriers
Delvoie, Simon ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

in Conference Series Earth and Environmental Science (2019, February)

Construction and demolition wastes (C&DW) are estimated at one third of total wastes generated in the European Union (EU) and represent the main flux in volume. Inert materials (e.g. concrete, bricks ... [more ▼]

Construction and demolition wastes (C&DW) are estimated at one third of total wastes generated in the European Union (EU) and represent the main flux in volume. Inert materials (e.g. concrete, bricks, tiles and ceramics) constitute the largest fraction of construction and demolition wastes. These wastes can be recovered as secondary raw materials after a recycling process resulting in the production of recycled sands and aggregates. The market for recycled sands and aggregates is however complex and sensitive. It can be affected by many parameters and may be very variable from one region to another, even in the same country. A quantitative analysis of some market variables is carried out in five NW European countries: Belgium, France, Germany, Luxembourg and the Netherlands. For achieving this analysis, attention is paid to the following data/parameters: generation of inert construction and demolition wastes, production of recycled sands and aggregates and production of natural sands and aggregates. Since the market of recycled products is also governed by transportation costs (mainly transported by road), the study has also compiled data on the density of recycling plants for construction and demolition wastes, the density of pits and quarries extracting natural materials, the density of inert landfills and taxes applied for C&DW landfilling. National/regional legislation and requirements are also included in the analysis. Based on the compiled data and objective reasons, the market of recycled sands and aggregates is more developed and more suitable in the Netherlands and in Flanders (North of Belgium) than in the other investigated countries/regions. [less ▲]

Detailed reference viewed: 52 (19 ULiège)
Full Text
Peer Reviewed
See detailCO2 CAPTURE FOR MINERALIZED MISCANTHUS AGGREGATES
Courard, Luc ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

in CO2 Storage in Concrete (2019)

At a time when the cement industry is largely responsible for the production of CO2 in the construction sector, it is useful to make this production a reverse phenomenon: that’s CO2 capture. The CO2 ... [more ▼]

At a time when the cement industry is largely responsible for the production of CO2 in the construction sector, it is useful to make this production a reverse phenomenon: that’s CO2 capture. The CO2 absorption process called carbonation, improves specific properties of the concrete during the conversion of carbon dioxide CO2 into calcium carbonate CaCO3. Current environmental concerns motivate the study of carbonation in order to maximize the absorption of carbon dioxide. Experimentation has been performed on bio-based and recycled concrete aggregates. The long term stability as well as the reinforcement of bio-based aggregates – miscanthus - may be obtained by means of a mineralization process of the natural product: a preparation with a lime and/or cement-based material is necessary to reinforce the cohesion of the bio-based product. Specific conditions for CO2 capture have been tested and concrete blocks have been produced with aggregates. Performances of aggregates and concrete blocks before and after carbonation are presented and show increasing performances in specific situations of CO2 capture. [less ▲]

Detailed reference viewed: 45 (5 ULiège)
Full Text
Peer Reviewed
See detailOptimizing performances of recycled aggregates for improving concrete properties
Courard, Luc ULiege; Tabarelli, Enrico ULiege; Michel, Frédéric ULiege et al

in Proceedings SMSS 2019 (2019)

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium: recycling has clearly to be promoted and by products to be valorised as secondary raw materials. The influence of the fine recycled concrete aggregates (FRCA) on the mechanical and durability properties of concrete was used for producing concrete. Concretes with different substitution rates (0, 30 and 100%) of natural sand by the FRCA were manufactured. Mechanical properties (compressive strength) and durability properties (capillary absorption, carbonation depth, and freeze/thaw resistance) were investigated. The results show that the compressive strength of concrete decreased as the substitution of FRCA increased. Durability of concrete could be strongly influenced by the high porosity and water absorption of fine recycled concrete aggregates. Brick fillers (BF) have also been studied for producing Self Compacting Mortars (SCM): introduction of 50 and 100% substitution clearly show a reduction of workability properties if particles water absorption is not taken into account. However, mechanical properties at 7 and 28 days didn’t show a clear impact of the substitution of limestone filler by brick filler. [less ▲]

Detailed reference viewed: 72 (16 ULiège)
Full Text
See detailState of the art on recycling techniques for the production of recycled sands and aggregates from construction and demolition wastes
Delvoie, Simon ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

in Nguyen, T.T.; Waldmann, D.; Venditti, S. (Eds.) Circular Concrete - SeRaMCo - Secondary Raw Materials for Concrete Precast Products (2018, November)

Construction and demolition wastes (C&DW) are estimated at one third of total wastes generated in the European Union (EU) and represent the main flux in volume. These wastes can be recycled in suitable ... [more ▼]

Construction and demolition wastes (C&DW) are estimated at one third of total wastes generated in the European Union (EU) and represent the main flux in volume. These wastes can be recycled in suitable recycling facilities which include a series of techniques able to crush and sort materials to finally produce recycled sands and aggregates with required properties. Common sorting techniques consist in ferrous metal sorting, hand-picking sorting and washing or air shifting sorting. Crushing is usually carried out by an impact or a jaw crusher and less frequently by a cone crusher. A combination of different crushers is also common for stationary recycling plants. In order to continuously improve the quality of the produced recycled materials, results obtained from innovative recycling techniques are also increasingly documented in literature. Some of the main innovative techniques related to C&DW recycling purposes are introduced in the study. [less ▲]

Detailed reference viewed: 41 (11 ULiège)
Full Text
Peer Reviewed
See detailUtilisation des sables et granulats recyclés dans le béton préfabriqué : comparaison des exigences réglementaires et techniques en Europe
Delvoie, Simon ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

Conference (2018, November)

L’utilisation des sables et granulats recyclés dans le béton préfabriqué est encore peu fréquente sur le plan industriel, et ce malgré les nombreuses recherches menées sur ce sujet. Dans un premier temps ... [more ▼]

L’utilisation des sables et granulats recyclés dans le béton préfabriqué est encore peu fréquente sur le plan industriel, et ce malgré les nombreuses recherches menées sur ce sujet. Dans un premier temps, cette étude fait le point sur les législations et les réglementations prises par les différents pays du nord-ouest de l’Europe (Allemagne, Belgique, France, Luxembourg et Pays-Bas) en vue de favoriser le recyclage et la valorisation des sables et granulats recyclés issus des déchets de construction et de démolition. Ces pays disposent d’un cadre législatif et réglementaire développé leur permettant d’atteindre l’objectif fixé par la Directive européenne 2008/98/CE visant à recycler et valoriser au moins 70% des déchets non dangereux de construction et de démolition en 2020. Le cadre normatif, en lien avec la production de béton préfabriqué et l’utilisation de sables et granulats recyclés, est ensuite analysé. Les principales normes européennes concernées sont : EN 206:2013+A1:2016 (béton), EN 13369:2018 (produits préfabriqués en béton) et EN 12620:2013 (granulats pour béton). Ces normes ont été, selon les cas, complétées ou non par des annexes nationales. Une attention est portée à la comparaison des différentes normes entre les pays du nord-ouest de l’Europe. Cette analyse comparative se penche (i) sur les taux de substitution maximum définis par la norme EN 206:2013+A1:2016 et les annexes nationales, ainsi que (ii) sur les caractéristiques que doivent avoir les granulats recyclés pour pouvoir être incorporés dans le béton. Les normes belge et française semblent plus restrictives vis-à-vis du taux de substitution maximum par rapport aux autres normes étudiées, tandis que les normes belge et luxembourgeoise semblent plus contraignantes concernant les caractéristiques que doivent avoir les granulats recyclés pour pouvoir être utilisés dans le béton. [less ▲]

Detailed reference viewed: 73 (10 ULiège)
See detailGypsum residues in recycled materials: characterization of fine recycled aggregates
Colman, Charlotte ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

Scientific conference (2018, August 26)

Globally, half of all generated waste is produced by the building sector. The finer fraction of this construction and demolition waste (C&DW) is often polluted with substances harmful for the durability ... [more ▼]

Globally, half of all generated waste is produced by the building sector. The finer fraction of this construction and demolition waste (C&DW) is often polluted with substances harmful for the durability of concrete, which is why their incorporation into a new structure is generally avoided. The most important contamination present in these materials consists of gypsum (CaSO4.2H2O) residues from the construction or demolition site. The presence of sulfates from this gypsum may complicate and accelerate the sulfate attack reaction, which is a deteriorating process that causes the expansive formation of the mineral ettringite. The high volume of this ettringite will cause an expansive stress within the concrete, with degradation and cracking of the structure as a result. Additionally, the leaching of sulfates can give rise to environmental problems. In this project, the fine fraction of C&DW from different industrial sources was investigated, to establish the gypsum contamination of actual recycled materials. Ion chromatography was used to determine the concentration of water soluble sulfates. Results showed a variable sulfate content, depending heavily on the source of the materials. Nevertheless, the total amounts surpassed the acceptable sulfate contents specified in the European standard EN 206. The obtained information about the concentration and size distribution of sulfate contamination in fine recycled materials (FRA) will help the development of a testing protocol for the effects of internal sulfate attack caused by gypsum residues. [less ▲]

Detailed reference viewed: 34 (4 ULiège)
Full Text
See detailEffects of limestone filler on the behaviour of recycled aggregate concrete
Zhao, Zengfeng ULiege; Courard, Luc ULiege; Michel, Frédéric ULiege et al

Scientific conference (2018, August 26)

According to the concept of sustainable development, sustainable construction is becoming a hot topic. Large amounts of construction and demolition wastes, especially concrete wastes, are generated ... [more ▼]

According to the concept of sustainable development, sustainable construction is becoming a hot topic. Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Meanwhile, large quantities of natural aggregates are needed for the construction of roads, buildings or civil engineering infrastructures. Until now, only a small part of concrete wastes is re-used as recycled concrete aggregates (RCA) in the manufacture of mortar and concrete. The issue of recycling construction and demolition wastes in the concrete industry has been widely explored by many researchers. RCA are mainly composed of an intimate mix between natural aggregates and adherent hardened cement paste or mortar. The later possesses a large water demand which makes it harder to recycle into concrete than natural aggregates. Limestone powder, which is a by-product of calcareous aggregate production, if not used, has to be disposed of in the landfills at a considerable cost. In this paper, the effect of limestone filler on the properties of recycled aggregate concrete (RAC) was studied. Recycled aggregates were produced in the laboratory from the crushing of concrete blocks and were then used as aggregates into new concretes. Concretes were manufactured by adding different percentages of limestone filler (0%, 10% and 20% of the mass of cement) and by replacing 30% of natural aggregate with recycled aggregates. Then, fresh properties and mechanical properties of these concretes were investigated. The results showed that the compressive strength of concrete with the addition of 10% limestone was 47.2 MPa after 28 days, which was larger than the reference concrete (43.1 MPa). [less ▲]

Detailed reference viewed: 30 (5 ULiège)
Full Text
See detailFeasible use of construction and demolition waste in concrete production: SeRaMCo project
Zhao, Zengfeng ULiege; Delvoie, Simon ULiege; Michel, Frédéric ULiege et al

Conference (2018, August 09)

About 850 million tons of construction and demolition waste (C&DW) are produced yearly in European Union. The Waste Framework Directive 2008/98/EC aims to a minimum target of reuse, recycling, and ... [more ▼]

About 850 million tons of construction and demolition waste (C&DW) are produced yearly in European Union. The Waste Framework Directive 2008/98/EC aims to a minimum target of reuse, recycling, and material recovery of non-hazardous C&DW at 70% by weight until 2020. Recycling of C&DW is quite important and has to be promoted. Up to now, most of recycled C&DW has been used as a base and sub-base materials in road construction, while only a small quantity of C&DW is reused in concrete. Interreg North-Western Europe project SeRaMCo (Secondary Raw Materials for Concrete Precast Products) aims to replace primary raw materials with the high-quality materials recycled from C&DW, e.g. concrete, bricks, tiles and ceramics (CBTC), in production of the cement and concrete products for use in North-Western Europe. To attain this goal, the project will: a) analyse and improve sorting of C&DW; b) develop and test new concrete mixes and technologies for the production of concrete precast products (CPPs) made from the recycled CBTC; c) establish a market niche for CPPs, leading to the economic advantages for the producers and generating new jobs in the construction sector. [less ▲]

Detailed reference viewed: 40 (8 ULiège)
Peer Reviewed
See detailInternal sulfate attack caused by gypsum contamination of recycled aggregates: development of a swelling test protocol
Colman, Charlotte ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

Conference (2018, July 12)

Sulfate attack is a deteriorating process for concrete, where the formation of expansive minerals such as ettringite causes the swelling of a material. The sulfates necessary for this reaction can come ... [more ▼]

Sulfate attack is a deteriorating process for concrete, where the formation of expansive minerals such as ettringite causes the swelling of a material. The sulfates necessary for this reaction can come from an external (such as sea- or groundwater) or an internal (such as cement or aggregates) source. A specific situation within this problematic is the contamination of recycled aggregates with gypsum from the demolition site. To assess the extent of the damage that this gypsum contamination can cause, the length of cementitious mixes that incorporated recycled aggregates needs to be monitored. The challenge in this research exists in finding the right testing protocol to follow the development of sulfate attack. Being a slow reaction which can take several months, accelerating procedures could be necessary. Different methods are described, but do not seem to be applicable in this specific context of gypsum contamination. In this paper, fine recycled aggregates contaminated with different levels of gypsum are subjected to a set of various storage conditions and/or aging cycles. The results show that existing protocols, set up specifically for internal sulfate attack, do not provide the acceleration or aggravation of the reaction as might have been shown before. A definitive testing protocol, to be used in this specific situation, is eventually proposed. [less ▲]

Detailed reference viewed: 29 (6 ULiège)
Full Text
See detailWPT1 - Market analysis and formal regulations in NWE
Delvoie, Simon ULiege; Zhao, Zengfeng ULiege; Michel, Frédéric ULiege et al

Report (2018)

In the European Union construction and demolition wastes are estimated at one third of all wastes generated and represent the main flux in volume. Inert materials (e.g. concrete, bricks, tiles and ... [more ▼]

In the European Union construction and demolition wastes are estimated at one third of all wastes generated and represent the main flux in volume. Inert materials (e.g. concrete, bricks, tiles and ceramics) constitute the largest fraction of construction and demolition wastes. However these wastes can be recovered as secondary raw materials after a recycling process resulting in the production of recycled sands and aggregates. An in-depth market analysis of recycled sands and aggregates in NW European countries (Belgium, France, Germany, Luxembourg and the Netherlands) has been performed in the framework of the Interreg NWE project SeRaMCo (Secondary Raw Materials for Concrete precast products). Market of recycled sands and aggregates is complex to understand. It can be affected by many parameters and may be very variable from one region to another, even in the same country. To achieve this analysis, attention has been paid to the following data/parameters: generation of inert construction and demolition wastes, production of recycled sands and aggregates and production of natural sands and aggregates. Since the market of recycled products is also governed by transportation costs (mainly transported by road), the study has also compiled data on the density of recycling plants for construction and demolition wastes, the density of pits and quarries extracting natural materials, the density of inert landfills and taxes applied for CDW landfilling. National/regional legislation and requirements have also been included in the analysis. [less ▲]

Detailed reference viewed: 17 (4 ULiège)
Full Text
Peer Reviewed
See detailImproving the properties of recycled concrete aggregates by accelerated carbonation
Zhao, Zengfeng ULiege; Remond, Sébastien; Damidot, Denis et al

in Proceedings of the Institution of Civil Engineers. Construction Materials (2018)

Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Until now, only a small fraction of concrete wastes has been reused as recycled concrete aggregates ... [more ▼]

Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Until now, only a small fraction of concrete wastes has been reused as recycled concrete aggregates (RCA) in the manufacture of mortar and concrete. In order to optimise the use of RCA for new concrete, it is important to improve the properties of RCA. RCA are mainly composed of an intimate mix of natural aggregates and adherent hardened cement paste, which has a much larger porosity than natural aggregates. The influence of accelerated carbonation on the properties of RCA was studied in this work. Original concrete was manufactured and crushed by a jaw crusher in the laboratory. The different fractions of laboratory-produced RCA were stored in an accelerated carbonation room. The mass loss, density, porosity and water absorption of the RCA were tested before and after carbonation. Industrial RCA were also studied for comparison with the laboratory-produced RCA. The results clearly showed that, after accelerated carbonation, the density of the RCA increased due to the transformation of portlandite into calcite. The water absorption and porosity of the RCA decreased after carbonation. [less ▲]

Detailed reference viewed: 25 (5 ULiège)
Full Text
Peer Reviewed
See detailInfluence of granular fraction and origin of recycled concrete aggregates on their properties
Zhao, Zengfeng ULiege; Courard, Luc ULiege; Michel, Frédéric ULiege et al

in European Journal of Environmental and Civil Engineering (2018)

Large quantities of construction and demolition wastes are produced each year. In order to make good use of recycled concrete aggregates (RCA) in concrete, it is very important to study the influence of ... [more ▼]

Large quantities of construction and demolition wastes are produced each year. In order to make good use of recycled concrete aggregates (RCA) in concrete, it is very important to study the influence of the granular fraction and the origin of RCA on their properties. In this study, RCA from industrial produced blocks (RCA_Blocks) and slabs (RCA_Slabs) were crushed and then separated into four granular fractions (0/2, 2/6.3, 6.3/14, 14/20 mm). Each granular fraction of RCA was physically characterised. Real RCA from recycling plant were also used for comparison. The results showed that recycled sands offered significantly higher cement paste content (higher bound water content) than coarse recycled aggregates. The fine RCA had therefore a higher water absorption coefficient compared to coarser fractions of RCA. The water absorption of finer fraction of RCA could be extrapolated precisely from the relationship between water absorption and cement paste content (or bound water content) of three coarse fractions of RCA. The values of hardened cement paste content obtained for the RCA_Blocks were lower than those measured on the RCA_Slabs, which was due to a smaller amount of initial cement paste content in blocks. The results showed that RCA_Slabs were more angular than RCA_Blocks. [less ▲]

Detailed reference viewed: 64 (31 ULiège)
Full Text
Peer Reviewed
See detailProperties of concrete with recycled construction and demolition wastes: a research experience in belgium
Zhao, Zengfeng ULiege; Courard, Luc ULiege; Michel, Frédéric ULiege et al

in Xiao, Jianzhuang (Ed.) Sustainable Structures and Materials (2018)

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium; recycling has clearly to be promoted. Concrete block wastes were crushed in the laboratory by a jaw crusher and the different fractions of laboratory produced RCA were characterized by measuring the hardened cement paste content, the density, the porosity and the water absorption. Results clearly show that, the recycled sands possessed significantly higher cement paste content and higher water absorption than coarse RCA. Then, concrete blocks with different substitutions (0%, 30%, 100%) of natural aggregate by the same volume fraction of RCA were manufactured. The fresh properties (slump, density, air content), and mechanical properties (compressive strength) were studied. The compressive strength of concrete decreased as the substitution of RCA increased. Results show that the compressive strength of concrete made with 100% RCA could reach 8 MPa after 28 days. Therefore, the use of RCA obtained from old block wastes in the production of new blocks can be envisaged depending on their class of exposure and the grade requirement. Moreover, the influence of the fine recycled concrete aggregates (FRCA) on the mechanical and durability properties of concrete was studied. The industrial FRCA produced from recycling center was used into concrete. The concretes with different substitutions (0%, 30%, 100%) of natural sand by the FRCA were manufactured. Mechanical properties (compressive strength) and durability properties (capillary absorption, carbonation depth, and freeze/thaw resistance) were investigated. The results show that the compressive strength of concrete decreased as the substitution of FRCA increased. Durability of concrete could be strongly influenced by the high porosity and water absorption of fine recycled concrete aggregates. [less ▲]

Detailed reference viewed: 78 (22 ULiège)
Full Text
See detailUse of biomass fly ash as partial replacement in the manufacture of mortars
Zhao, Zengfeng ULiege; Courard, Luc ULiege; Michel, Frédéric ULiege et al

Scientific conference (2018)

Biomass is widely used as a renewable energy source, which accounts for more than 4% of the total energy consumption in the European Union and it will be increased in the future. The combustion of biomass ... [more ▼]

Biomass is widely used as a renewable energy source, which accounts for more than 4% of the total energy consumption in the European Union and it will be increased in the future. The combustion of biomass or co-combustion of biomass with coal can reduce coal consumption and minimize the global CO 2 emissions. However, the storage of biomass fly ash occupies land area and increases the risk of contamination of groundwater. Biomass fly ash has been used for several purposes such as fertilization in agriculture and atmospheric pollution control.In this paper, the feasibility of using biomass fly ash as a supplementary cementitious material was investigated. The biomass fly ash from combustion of 100% wood pellets were collected from industrial power plant located in Belgium. The physicochemical properties of fly ashes were characterized by different techniques such as laser diffraction spectroscopy, X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The biomass fly ash was irregular in shape. Mortars with different percentages of substitution (0%, 10%, 20%, 30% and 50%) of cement by biomass fly ash were manufactured, and then the fresh properties (slump) and mechanical properties (compressive strength and flexural strength) were studied. [less ▲]

Detailed reference viewed: 27 (5 ULiège)
Full Text
Peer Reviewed
See detailCompatibility of superplasticizers with fly ash and limestone fillers ternary blended cements
Courard, Luc ULiege; Michel, Frédéric ULiege; Pierre, Christian et al

in Cement and Concrete Composites (2018)

Ternary blended cement is more and more used for technical, environmental and economical purposes. Depending on availability, blast furnace slags, fly ashes and limestone fillers are mixed in large ... [more ▼]

Ternary blended cement is more and more used for technical, environmental and economical purposes. Depending on availability, blast furnace slags, fly ashes and limestone fillers are mixed in large proportions for cement production, allowing reduction of CO2 production and use of natural resources. As limestone fillers are largely produced in Wallonia because of quarries and aggregate delivery, this product has been incorporated in concrete up to 35% and properties of concrete containing also fly ashes have been evaluated. This paper presents the results of the study of the compatibility between ternary blended cements and superplasticizers. Tests are realized on mortars and concrete. They clearly show that concrete containing the highest limestone fillers rate, have a low initial setting and zero setting after 30 minutes when a superplasticizer is not used. Impure fillers seem to have a very negative impact on the loss of consistency after 30 min. Air content systematically increases with the use of superplasticizer type polycarboxilate; the naphthalene type seems to have a lower impact on air content. Finally, cement having higher clinker contents exhibit higher compressive strengths and many of ternary blended cements are fulfilling standard requirements. [less ▲]

Detailed reference viewed: 54 (2 ULiège)
Full Text
Peer Reviewed
See detailINCREASING PROPERTIES OF CONCRETE WITH RECYCLED CONSTRUCTION AND DEMOLITION WASTES
Courard, Luc ULiege; Michel, Frédéric ULiege; Bouarroudj, Karim et al

in Betoni z Izboljsanimi lastnostmi (2018)

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium; recycling has clearly to be promoted. Concrete block wastes were crushed in the laboratory by a jaw crusher and the different fractions of laboratory produced RCA were characterized by measuring the hardened cement paste content, the density, the porosity and the water absorption. Results clearly show that, the recycled sands possessed significantly higher cement paste content and higher water absorption than coarse RCA. Then, concrete blocks with different substitutions (0%, 30%, 100%) of natural aggregate by the same volume fraction of RCA were manufactured. The fresh properties (slump, density, air content), and mechanical properties (compressive strength) were studied. The compressive strength of concrete decreased as the substitution of RCA increased. Results show that the compressive strength of concrete made with 100% RCA could reach 8 MPa after 28 days. Therefore, the use of RCA obtained from old block wastes in the production of new blocks can be envisaged depending on their class of exposure and the grade requirement. Moreover, the influence of the fine recycled concrete aggregates (FRCA) on the mechanical and durability properties of concrete was studied. The industrial FRCA produced from recycling center was used into concrete. The concretes with different substitutions (0%, 30%, 100%) of natural sand by the FRCA were manufactured. Mechanical properties (compressive strength) and durability properties (capillary absorption, carbonation depth, and freeze/thaw resistance) were investigated. The results show that the compressive strength of concrete decreased as the substitution of FRCA increased. Durability of concrete could be strongly influenced by the high porosity and water absorption of fine recycled concrete aggregates [less ▲]

Detailed reference viewed: 73 (30 ULiège)
Full Text
Peer Reviewed
See detailHygro-themal and durability properties of a lightweight mortar made with foamed plastic waste aggregates
Coppola, Bartolomeo; Courard, Luc ULiege; Michel, Frédéric ULiege et al

in Construction and Building Materials (2018), 170

In the present study, hygro-thermal and durability related properties of a cementitious mortar containing highly porous foamed aggregates obtained from polymeric end-of-waste materials were investigated ... [more ▼]

In the present study, hygro-thermal and durability related properties of a cementitious mortar containing highly porous foamed aggregates obtained from polymeric end-of-waste materials were investigated. The evaluation of capillary water absorption, thermal conductivity, water vapour permeability and sulfate attack resistance of samples where natural quartz sand was replaced by 10%, 25% and 50% in volume with foamed aggregates was carried out. Experimental investigations showed that the presence of plastic aggregates decreased mortar density (up to 36%, compared to the reference sample, for the maximum investigated natural sand volume replacement) as well as thermal conductivity (10% for the 50% volume replacement). Moreover, water vapour transmission rate increased at increasing natural sand replacement while capillary water absorption decreased. Finally, after fifteen cycles of sulfate attack test, lightweight mortars evidenced a lower mass loss compared to the reference sample. The results were related to morphological modifications in the mortars bulk porosity, demonstrating by mercury intrusion porosimetry investigations, that polymeric foamed aggregates determine a variation of the pores microstructure, resulting in an increased pores dimension. [less ▲]

Detailed reference viewed: 36 (12 ULiège)
Full Text
Peer Reviewed
See detailData on thermal conductivity, water vapour permeability and water absorption of a cementitious mortar containing end-of-waste plastic aggregates
Di Maio, Luciano; Coppola, Bartolomeo; Courard, Luc ULiege et al

in Data in Brief (2018)

The data presented in this article are related to the research article entitled “Hygro-thermal and durability properties of a lightweight mortar made with foamed plastic waste aggregates ” (Coppola et al ... [more ▼]

The data presented in this article are related to the research article entitled “Hygro-thermal and durability properties of a lightweight mortar made with foamed plastic waste aggregates ” (Coppola et al., 2018). This article focuses the attention on thermal conductivity, water vapour permeability and water absorption of a lightweight cementitious mortar containing foamed end-of-waste plastic aggregates, produced via foam extrusion process. Thermal conductivity, water vapour permeability and water absorption data are made available to allow comparison and/or extend the analysis. Experimental investigations showed that the presence of plastic aggregates decreased thermal conductivity,water vapour resistance and capillary water absorption. [less ▲]

Detailed reference viewed: 32 (4 ULiège)