Behaviour of lightweight extruded concrete subjected to high temperatures

Status	已發表Published
	Behaviour of lightweight extruded concrete subjected to high temperatures
	Zhou X.; Zongjin L.
	2003-12-01
Source Publication	Role of Cement Science in Sustainable Development - Proceedings of the International Symposium - Celebrating Concrete: People and Practice
Pages	499-508
Abstract	Lightweight concrete manufactured by extrusion technique has been investigated for resistance to high temperatures. The concrete contains a large amount of perlite and a small percentage of fibres. The samples, thin plates and cylinders, were subjected to different thermal treatment with maximal exposure temperatures T up to 600°C and exposure periods T from 1 hour to 10 hours. The residual mechanical properties, flexural strength f , compressive strength f and modulus of elasticity E, were measured and normalized to the values of those without thermal treatments. The microstructure of these composites was studied by SEM while the pore structure by MIP. It was found that f , f and E significantly decreased as T and T increased due to fibres melting and softening, cement hydrates degenerating and porosity increasing during thermal heating. f decreased more remarkably than f and E. The thin sheets reinforced by PVA fibres showed a more significant decrease in f than those reinforced by glass fibres, due to PVA fibres having much lower melting point. Besides, the composites, incorporating silica sand as aggregates, showed systematically more significant degeneration of mechanical properties than those using perlite as aggregates, which could be attributed to the greater specific heat, lower thermal conduction coefficient, and the better thermal insulation property of perlite.
Keyword	Extrudate Fibre reinforced High temperatures Microstructure Perlite Porosity Residual mechanical properties Thermal insulation
URL	View the original
Language	英語English
Fulltext Access	View Full-Text via Scopus
Document Type	Conference paper
Collection	University of Macau
Affiliation	Hong Kong University of Science and Technology
Recommended Citation GB/T 7714	Zhou X.,Zongjin L.. Behaviour of lightweight extruded concrete subjected to high temperatures[C], 2003, 499-508.
APA	Zhou X.., & Zongjin L. (2003). Behaviour of lightweight extruded concrete subjected to high temperatures. Role of Cement Science in Sustainable Development - Proceedings of the International Symposium - Celebrating Concrete: People and Practice, 499-508.

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