The hazardous nature of cement due to CO2 emissions and depletion of natural raw material resources causes a lot of challenges to the construction industry. The cost of cement production increases due to increased green tax and scarcity of raw materials. Owing to these challenges, this research aimed at replacing cement with waste plastic and laterite soil for the production of paving interlock blocks. Specific objectives included the determination of the compressive strength of the laterite/polyethylene composites; the melting point and subsequent effects of temperature on polyethylene; assessing the performance of paving interlock blocks made of laterite/polyethylene composite in terms of physicochemical properties such as flexural strength; and the mix ratio of the material components that gives the highest compressive strength. Thus, waste plastics and laterite soil which are relatively abundant were identified for this project. An invented auto-mechanical densifier machine is used in melting plastic and mixing with laterite for efficient mass production of interlocking bricks. Different proportions of plastic wastes and laterite soil were mixed and processed into composite bricks, it was observed that the maximum compressive and flexural strengths sustained by the composite bricks are 10.06 N/mm2 and 7.14 N/mm2 respectively. The paving interlock blocks made from polyethylene/laterite composite registered high relative performance. If made and put into use, these blocks will reduce construction costs, assist in environmental conservation, and improve economic growth. Utilization of these waste plastics as alternatives for cement in road pavement interlock production will lead to a paradigm shift in the sector since it is both an environmentally and economically friendly choice, considering the waste management challenge and the road infrastructure gaps existing in our municipalities.

Leave a Comment