USING ADHESIVE MATTER FOR AGRICULTURAL WASTES AS BUILDING BRICKS

Abstract

This research aims at studying the use of some adhesive materials for rice straw in building bricks. It also studies the physical and mechanical properties of these bricks to know their potential practical use. The study of bricks was evaluated using bulk density, thermal conductivity, acoustic insulation and compressive strength. Two particle sizes (small and large), two formation pressures (1.3 and 2.5 MPa) and three different mixing ratios were chosen for binding material in mixture (45, 60 and 75%). The obtained data showed that bulk density increases with increasing binding material percentage. Bulk density was higher at small chops than large chops. The value of thermal conductivity increases with increasing of binding material percentage. The minimum and maximum values of thermal conductivity were 0.077 W/m.°c at 1.3 MPa and mixture percentage of 45% for large chops with By-Pass cement dust, and 0.315 W/m.°c at 2.5 MPa and mixture percentage of 75%  for small chops with clay (respectively). Acoustic insulation percentage decreased with increasing binding material percentage for both small and large chops, while minimum and maximum values of acoustic insulation percentage were 4.8 % at 1.3 MPa and mixture percentage of 75% for large chops with clay, and 10.09 % at 2.5 MPa and ratio of 45% for small chops with By-Pass cement, respectively. The results of compressive strength test indicated that mixing of small rice straw with By-Pass cement for all ratiosat different pressures and mixing of large rice straw with By-Pass cement for ratio of 75% is accepted as a carrying brick, and also mixing of small rice straw with clay for ratios 60 and 75% and mixing of large rice straw with clay for ratio 75% at different pressures is accepted as a carrying brick.