UTILIZATION OF SOLID WASTE (FLY-ASH) AND RUBBER LATEX MIXED WITH CLAY AND ACID SOLVENT TO PRODUCE CONCRETE BRICK USING SOLIDIFICATION PROCESS

Muhammad Hatta Dahlan, Dwi Avinda Rani, Farhah Ayu Fajrin

Abstract


The use of coal as a fuel for steam power plants (PLTU) in the mine is increasing along with the increasing demand of electricity from manufacturing and household industries. The optimization of coal combustion in steam power plants has a negative impact on the environment due to increased of solid coal ash containing hazardous and toxic materials). The use of coal as a raw material for steam power plants leaves approximately 30% ash which is discarded and unprocessed as waste. This encourages researchers to use coal ash to make concrete bricks in more economical and efficient way. In order to make concrete bricks more solid and lightweight, sap rubber mixer which is widely produced in the area of southern Sumatra, was used as a mixture. Rubber prices are not aligned to rubber farmers where the price of rubber is regulated by the rubber market trader so the price is very low. Thus, it is also one of the solutions to diversify the potential of rubber products other than rubber for the tire and automotive industries. The objective of this research is to know the compressive strength of concrete brick with modulus of rupture parameters, cold crushing test of bricks and absorption of bricks according to Indonesian National Standard (SNI); and the amount of acid solvent of ants as rubber clotting. Composition of rubber latex and coal fly ash as follows: 300: 700; 400: 600; 500: 500; 400: 600; 700: 300 with an acid solvent such as: 15ml; 20 ml and 30 ml. The highest MOR and Cold Crushing test values were obtained on the ratio of abubara and 500: 500 rubber glues and the lowest MOR and Cold crushing test values were 15.117kgf / cm2 and 50 kgf / cm2 while the lowest absorbency in the 500: 500 composition.

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