SHALE ASH CONCRETE

This paper describes the use of an industrial waste product oil shale ash as a pozzolana and as a carrier for superplasticizer to form carri er fluidifying agent. For a series of concrete mixes with a wide range of w/c ratios, test results indicated that the partial replacement of cement by an equal weight of shale ash could effect an increase in th e compressive strength. For 10% replacement, the compressive strength of the concrete could be increased by 5 to 10% at 28 days and 10 to 15 % at 56 days. When shale ash was used to act as the carrier for a supe rplasticizer, the resulting carrier fluidifying agent could control th e loss of slump of concrete mixes. For a 1.5% dosage of the carrier fl uidifying agent, the slump of concrete was maintained for 90 minutes. (C) 1997 Elsevier Science Ltd.