Physical changes of low quality of clay bricks due to sandy-soil mixture under combustion performance

This research studies the physical properties of low quality bricks mixed with sandy -soil in home industries located Gunung Sarik Padang City. The ratio mixture brick making material was not measured proper measurement; as a result poor. used 5 x cm and 180 cubes to see changes. materials between soil clay are 0.11.025, 0.43,0.67,1.0, 1.50. procedure for same factory without changing method. process burning three days two nights using wood. From test results, density did change significantly direct indirect fire exposure but decreased proportion addition soil. reduces percentage damage acceptable is range 0.43.-0.6.