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Novel composites of clay/iron sand/rice husk ash (RHA) have been developed. Electric furnace was used  to perform heat treatment on the composites to study the effect of sintering temperature on their apparent porosity and compressive strength. Two types of  RHA  with different bulk density  were prepared to gain an  understanding of  the influence of apparent porosity on compressive strength of the heat-treated composites over a range of sintering temperatures. Heattreated  composites,  made  of clay/iron  sand  and  clay/RHA,  were  also  prepared  as  a referenced  material.  X-ray diffraction (XRD) analysis was further performed tocomprehensively discuss the role of iron sand on apparent porosity and compressive  strength of the  heat-treated composites. The results show that the increase of  sintering temperature reduces apparent porosity of the heat-treated composites. Reducing on the apparent porosity was then followed by the increase of compressive strength of the heat-treated composites. Compressive strength of the heat-treated composites was not sensitive to the sintering temperature up to 800 °C, and it would be more improved at the sintering temperature above  800  °C.  This  study  concludes  that  such sintering  temperature  significantly  improved  apparent  porosity  and compressive strength of the composites due to use of iron sand

Apparent Porosity and Compressive Strength of Heat-Treated Clay/Iron Sand/Rice Husk Ash Composites over a Range of Sintering Temperatures