Kajian karakteristik fisik dan mekanis bata campuran tanah lempung, semen, pasir dan serabut kelapa panjang 2,5 cm dengan variasi 2%, 4% dan 6% dari massa semen = Analysis of phisical and mechanical of brick with composition clay, cement, sand, and 2.5 cm length of coconut fiber and variety of fiber; 2%, 4% and 6% from mass of cement