Effect of silica fume and MIRHA on thermal conductivity of cement paste

Farhan, S. A. and Khamidi, M. Faris and Murni, M. H. and Nuruddin, F and Idrus, Arazi and Al Yacouby, A. M. (2011) Effect of silica fume and MIRHA on thermal conductivity of cement paste. In: Third International Conference on Management of Natural Resources, Sustainable Development and Ecological Hazards (Ravage of the Planet III), 13-15 December 2011, Shah Alam. (In Press)

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Increased usage of air-conditioners in buildings leads to higher levels of electricity and energy consumption. Thermal insulation improves energy-efficiency of buildings by retarding heat flow through building envelopes and thus reducing indoor cooling load. This research investigates the potential of two cement replacement materials, which are silica fume and Microwave Incinerated Rice Husk Ash (MIRHA), incorporated in cement paste as thermal insulation. Samples of cement paste with varying volumes of silica fume and MIRHA were prepared and evaluated on their thermal conductivity values. Their viability as building materials were then evaluated by measuring their permeable porosities and compressive strengths at three (3), seven (7) and 28 days of curing. Results show that higher dosage of silica fume and MIRHA in cement paste lead to lower thermal conductivity but negatively affect compressive strength and permeable porosity. MIRHA reduces thermal conductivity more efficiently than silica fume but leads to a faster decline in compressive strength and increase in permeable porosity. The lowest thermal conductivity value obtained in this experiment was 0.4273 Wm-1K-1, which was achieved by samples with MIRHA incorporated at 25% of cement paste volume.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Departments / MOR / COE:Departments > Civil Engineering
ID Code:7233
Deposited By: Prof Ir Dr Muhd Fadhil Nuruddin
Deposited On:19 Dec 2011 00:54
Last Modified:19 Jan 2017 08:22

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