DefinePK

Abstract

This paper presents the study on the volcanic ash as replacement of cement on compression strength of concrete. Preliminary study at the early stage were conducted with the specific gravity and sieve analysis of the volcanic as replacement of cement material of concrete. This paper presents about the influence of addition palm shells ash to mineralogy and physical properties of clay soil located in the sub district of Percut Sei Tuan, district of Deli Serdang, North Sumatera Province, Indonesia. This study aims to improve physical properties and to analyze mineralogical content from poor soils into good soil called soil stabilization. Alternative materials used are palm shells ash obtained from solid waste palm factory whose numbers continue to increase and not yet utilized properly. The addition of palm shells ash is useful to stabilize clay soil, which is expected to improve the quality of the soil. The tests performed are the original soil characteristics test and the soil after mixing with palm shells ash which includes mineralogical test, chemical element test, grain tes gradation, specivic gravity test, clay soil consistency limits before and after mixed with palm shell ash. The addition of palm shell ash in clay soil caused a change of mineralogy in clay soil, which before stabilized the original clay mineralogy element for Illite 54% and after stabilized decreased to 51%, while for the original soil liquid limit (LL) of 56.73%, after stabilization there was a decrease of liquid limit of 47.23%, and the value of plasticity index (PI) of original clay soil of 25.60% and after stabilization PI value decreased to 21, 60%.