Pengaruh Abu Terbang terhadap Karakteristik Mekanik Beton Mutu Tinggi

Abstract

The hight strength concrete has known and use in many construction in Indonesia.This is proven with many contruction such as high rise building and long spanbridge that use it. Right now many research about hight strenght concrete combinewith fly ash. PT. RAPP as one of pulp and paper industries in Riau provience usecoal as energy resources. The waste material from burning process produce flay ashthat can be used. In this research, fine and coarse aggregate was take local sourcethat easy find in Pekanbaru market. The basis material for the establishment ofconcrete mixed with fly ash with various compositions and also assisted with thesuperplasticizer to increase workabilty. Variation content of fly ash used 0%, 15%,20%, 25%, and 30% by weight of cement. The type of specimens was a cylinderwith size 150 mm x 300 mm. The compressive strength is 40 MPa were tested at 28days with a curing process. The test results showed that the highest compressivestrength contained in concrete mixtures with fly ash usage 20% at 41.03 MPa. Thehighest value of splitting tensile strength is 3.18 MPa with 20% fly ash content.Value modulus of Elasticity was 4.27 x 104 MPa. The results of this study indicatethe use of fly ash in concrete mixtures optimal in 20%. These were indicated withincrease compressive strength, tensile strength, and modulus of elasticity, while theuse of fly ash above 20% would be decline.