The Effects of Cold Lava Aggregate as A Filler Material of Concrete

Abstract

An alternative concrete material is needed in conjunction with the concern of environment and economical concrete material. Reducing the content of cement in concrete material and substituting a part of cement content in concrete will indirectly reduce the air pollution due to the process of cement production. In this study, cold lava aggregate (Malang aggregate) is used as a filler material that has the characteristic partly like cement to substitute a part of cement content in concrete. The substitution of cement is varied as 10%, 20%, 30% and 40%. The purpose of study is to investigate the effects of cold lava aggregate on the compressive strength in the age of 1-28 days. As the comparison, the normal concrete without the content of cold lava aggregate is prepared. The results indicated that the concrete with 10% cold lava aggregate has the compressive strength close to normal concrete.