Thermal conductivity of cement composites containing rubber waste particles: Experimental study and modelling

Benazzouk, Amar; Douzane, Omar; Mezreb, K.; Laidoudi, Boubker; Quéneudec, M.

doi:10.1016/j.conbuildmat.2006.11.011

Cited by 200 publications

(96 citation statements)

References 22 publications

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“…The use of industrial by-products to reduce the thermal conductivity of cement-based materials has significant advantages associated with improved resource efficiency. Relevant research has included work on lightweight cement-based materials containing waste glass, fly ash, silica fume, tyre rubber, expanded clay, wood and paper (44)(45)(46)(47)(48).…”

Section: Introductionmentioning

confidence: 99%

Lightweight mortars containing expanded polystyrene and paper sludge ash

Ferrándiz-Mas

Bond

García-Alcocel

et al. 2014

Construction and Building Materials

131

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The objective of this research was to develop lightweight cement mortars with good thermal-insulation properties by incorporating expanded polystyrene (EPS) and paper sludge ash (PSA), both of which are problematic waste materials. The mortars formed had low thermal conductivity and low bulk density compared to control samples. Ground EPS produced lower thermal conductivity samples than powdered EPS. Resource efficient mortars containing up to 20% PSA, and 60% of EPS are considered suitable for use in rendering and plastering applications.

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Section: Introductionmentioning

confidence: 99%

Lightweight mortars containing expanded polystyrene and paper sludge ash

Ferrándiz-Mas

Bond

García-Alcocel

et al. 2014

Construction and Building Materials

131

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“…Innovative solutions for recycling of tyres have been the focus of much research, such as the addition of the scrap tyre rubber in asphalt, concretes and polymers [8][9][10][11] ; as well as incineration for vapour production and energy production 8,12 .…”

Section: Introductionmentioning

confidence: 99%

Investigations on cementitious composites based on rubber particle waste additions

et al. 2012

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The amount of waste rubber has gradually increased over recent years because of over-growing use of rubber products. The disposal of waste rubber has caused serious environmental problems. The incorporation of recycled materials into cementitious composites is a feasible alternative that has gained ground in civil construction. The performance of such materials is much affected not only by the rubber addition, but also the particle size which has been controversially reported in the literature. In order to investigate the single effect of rubber particles into cement based materials, rubber cementitious composites were prepared with no silica particle additions. A full factorial design has been conducted to assess the influence of the rubber particle size (0.84/0.58 mm and 0.28/0.18 mm); mass fraction used (5, 15 and 30%); and water/cement ratio (0.35 and 0.50) on the physic-mechanical properties of the composites. The materials were characterized through apparent density, porosity, compressive strength, flexural strength, modulus of elasticity and microstructural analysis. The interactions of rubber particle size, rubber fraction and water/cement ratio affected significantly the density and compressive strength of the composites. The apparent porosity was influenced mainly by the rubber particle size. The flexural strength was affected by the main factors and the modulus of elasticity was affected by the interaction factors rubber particle size and fraction, and rubber fraction and w/c ratio.

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“…Even in small quantities, its addition significantly alters the heat transfer properties of mortars. Several previous studies have shown that the use of LWA results in a reduction of the thermal conductivity [40][41][42][43][44][45][46] and that there is a strong correlation between the thermal conductivity and the dry density of lightweight cement composites. This correlation mainly depends on the type of LWA used (cenospheres, pumice aggregates, wood shavings, rubber waste, expanded perlite, or shale, etc.).…”

Section: Effect Of Pur Foam Aggregatesmentioning

confidence: 99%

Transient Thermal Response of Lightweight Cementitious Composites Made with Polyurethane Foam Waste

2012

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International audienceThe development of low-cost lightweight aggregate (LWA) mortars and concretes presents many advantages, especially in terms of lightness and thermal insulation performances of structures. Low-cost LWA mainly comes from the recovery of vegetal or plastic wastes. This article focuses on the characterization of the thermal conductivity of innovative lightweight cementitious composites made with fine particles of rigid polyurethane (PU) foam waste. Five mortars were prepared with various mass substitution rates of cement with PU-foam particles. Their thermal conductivity was measured with two transient methods: the heating-film method and the hot-disk method. The incorporation of PU-foam particles causes a reduction of up to 18 % of the mortar density, accompanied by a significant improvement of the thermal insulating performance. The effect of segregation on the thermal properties of LWA mortars due to the differences of density among the cementitious matrix, sand, and LWA has also been quantified. The application of the hot-disk method reveals a gradient of thermal conductivity along the thickness of the specimens, which could be explained by a non-uniform repartition of fine PU-foam particles and mineral aggregates within the mortars. The results show a spatial variation of the thermal conductivity of the LWA mortars, ranging from 9 % to 19 %. However, this variation remains close to or even lower than that observed on a normal weight aggregate mortar. Finally, a self-consistent approach is proposed to estimate the thermal conductivity of PU-foam cement-based composites

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Thermal conductivity of cement composites containing rubber waste particles: Experimental study and modelling

Cited by 200 publications

References 22 publications

Lightweight mortars containing expanded polystyrene and paper sludge ash

Lightweight mortars containing expanded polystyrene and paper sludge ash

Investigations on cementitious composites based on rubber particle waste additions

Transient Thermal Response of Lightweight Cementitious Composites Made with Polyurethane Foam Waste

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