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

Content Provider	Springer Nature Link
Author	Kismi, M. Poullain, P. Mounanga, P.
Copyright Year	2012
Abstract	The 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.
Starting Page	1239
Ending Page	1258
Page Count	20
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	33
Issue Number	7
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2012-07-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lightweight aggregate mortars Polyurethane foam Segregation Self-consistent modeling Thermal conductivity Transient method Industrial Chemistry/Chemical Engineering Condensed Matter Physics Mechanics Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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