28 Nov 2019
Unfired composite clay brick is being investigated. Amendment with bamboo fibers are considered for bending strength, and waste linseed oil is considered for protection from moisture. The fiber used in this study was extracted from Guadua angustifolia bamboo and treated with 4% Lye for 24 hours. The composite brick was
made by adding soil (clay and sand), 0–7% treated bamboo’s fibers, and 8% mixing liquids (water and oil) to make water-fiber-brick (WFB) and oil-fiber-brick (OFB).
The mixture was confined using a hydraulic jack. The specimens were air-dried for 45 days. The tendency to absorb water was measured by soaking the bricks in water for 24 hours. The results showed a decrease of water absorption by 71% due to the incorporation of linseed oil. At 3% ratio of bamboo fiber to clay, the bending and
compression strength of the OFB composite reached an optimum value of 2.50 Mpa (357 psi) and 23.4 Mpa (3400 psi), respectively. Linseed oil contributed to increasing the strength of the brick. This is due to the fact that unsaturated linseed oil reacts with oxygen to form a stable polymer with strong bonds.
By Aubin Fossouo, SJ and Alan Hoback
Keywords: alkaline, clay, oil, fiber, composite