THE EFFICIENCY OF FLY ASH AND CEMENT SLAG TO DEVELOPMENT BUILDING

Abstract

In world construction, the construction of high-rise buildings almost entirely uses concrete. This
study uses fly ash and cement slag as a cement substitute as a reduction in cement requirements. This is due to
the limited amount of cement in the market and the binding function of cement and the increasing cement
prices. The use of fly ash and cement slag is toxic hazardous waste material that must be handled so that it can
be used properly. From the results of the age strength of concrete 1-3 days, the compressive strength of fly ash
is higher than that of cement slag but from a mixture of 28 days, it reaches 100% in accordance with the
specified standard. In this laboratory test for the use of fly ash and slag cement, 50%, in the future it is necessary
to research that the use of fly ash and slag cement can be up to 70% so that the use of fly ash material and
cement slag can replace the function of concrete mixed cement as a binder of coarse and fine material to get
concrete compressive strength with specified standards. Production costs can be minimized so that if this
applied can avoid the company from potential billions/year losses.