EFFECT OF LIGNOSULPHONATE SUPERPLASTICIZER FROM RICE STRAW ON PROPERTIES OF CONCRETE CONTAINING SILICA FUME

Abstract

   This work aims to study the effect of the lignosulphonate from rice straw of Vietnam (LSVN) on the slump, compressive strength and microstructure of high peformance concrete containing silica fume (SF). The concrete were prepared from sand, Portland cement PC50 and 5 wt.% SF. The results show that addition of LSVN to the concrete increased their slump and reduced the water/cement ratio. The addition of 0.15-0.2 wt.% LSVN brings higher compressive strength values of concrete containing SF than those of concrete non-containing SF. When dosage was 0.15%, the water reduction was 21.2% in concrete.Keywords: lignosulphonate, high peformance concrete, silica fume, compressive strength, slump