Influence of aggregate type on workability of self-consolidating lightweight concrete

In this study, the effects of aggregate type on the workability of self-consolidating concrete produced with lightweight aggregate (self-consolidating lightweight concrete - SCLC) were investigated. In experiments, three coarse lightweight aggregate (LWA) types, namely pumice, volcanic tuff and diatomite, were used. Different combinations of water/powder ratio and superplasticiser dosage levels were prepared for the self-consolidating lightweight concrete mixtures. The total powder content (cement and mineral additives) was constant in the experiments. Workability tests such as slump flow, restricted slump flow, filling-box, V-funnel, GTM screen stability, L-box and U-box were performed to characterise accurately the flow ability, passing ability and segregation resistance of self-consolidating lightweight concrete in fresh condition. The results, in general, showed that self-consolidating lightweight concrete with lightweight aggregate in low unit weight has higher flow ability and passing ability. The segregation of self-consolidating lightweight concrete was prevented by use of air-entraining admixture in high water/powder ratios. As a result, it was observed that the aggregate type and water/powder ratio has significant influence on the workability properties of self-consolidating lightweight concrete.