The Utilization of Crushed Clay Brick as Coarse Aggregate on Eco-Green Lightweight Foamed Concrete

Abstract

Lightweight Concrete has advantages in its weight, so as to minimize bending moment and mitigate earthquakes. Lightweight Concrete can be made by changing its aggregate with a lightweight aggregate or foaming the mortar, so that the concrete becomes porous and lightweight. But, porosity, density and compression strength concrete have relation. This research aims to obtain the value of density, porosity and compression strength from Lightweight foamed concrete that use crushed clay bricks as coarse aggregate. Testing was conducted to 96 samples of concrete with diameter of 15 cm and height of 30 cm. Foam Agent added is varied 0%-3.5% to the water weight. Before compressive strength testing, the samples were first cured and tested after age 7; 14; 21 and 28 days. From the testing result, it is obtained that crushed clay bricks can be made as coarse aggregate in eco-green lightweight concrete. If foam agent added are 2-3.5% then it is categorized as Moderate Strength Concrete, while if foam agent added is < 2% it is categorized as Structural Concrete, based on specification of Indonesian National Standard (SNI 03-3449-2002)