Rice husk and fly ash concrete blocks

Abstract This paper forms part of a project on materials, technology and prototypes of very low cost housing, carried out at the Instituto Eduardo Torroja (Spain). Results are presented of 40 × 20 × 20 cm blocks, with a concrete made up of an agricultural waste product, rice husk, and an industrial by-product, fly ash, and formed by means of a manual placement machine. The blocks have a density of about 1100kg/m 3 , a K value of 0·20 W/m°C and failure loads of 7000 to 8000 kp.