Abstract:
This paper studied the effect of air-entraining agent on strength, bulk density and thermal
conductivity of lightweighted concrete blended with synthetic rice husk ash (sRIJA). sRHA was
used to replace ordinary Portland cement (OPC) type 1 and 3 at 40, 50 and 60 wt.'Yr, of the binders
(OPe, sRHA and quick lime) and quick lime at 20 wt.% of the binders. Lightweight concrete was
prepared using binders and sand at the ration of 2:1 and rhrec types of air entraining agent
Aluminium Powder, Portland foam, and Portland light, were used at 0.5 and I WI.(YiJ of the binders.
Results showed that sample prepared by replacement of OPC type! with sRHA at 60 vvt.% and
containing 1 wt.% of Aluminium Powder gave the lowest bulk density equal to 0.89 kg/em' , a 28-
day strength of 41 kg/cm2and thermal conductivity of 0.70 I W/moK