Management process study of educational waste concrete materials to interlocking bricks under community products standards

Abstract

The aim of this research is to study the management of concrete waste from education institutions. Concrete is recycled as a mixture of interlocking brick blocks and developed to meet Thai standards for Community Products. This process reduces the cost of disposal, raises awareness of the cost-effective use of resources, and can transfer knowledge to nearby communities. The data on the purchase of educational materials (rock) and the contract for the disposal of concrete waste from the fiscal year 2020 to 2022 were analyzed. Then, concrete waste was ground to small sizes for recycling and using in the classroom. Concrete fragments smaller than 4.75 mm (rock dust) were used as a mixture of interlocking brick blocks. It was found that in the case of using the traditional management method an average of 11,013.30 baht per year will be spent on purchasing and disposal fees. If this research process is applied to manage concrete waste. The budget for disposal will be not spent and the number of purchases of educational materials (rock) will be reduced by approximately 3 tons per year. Rock dust that cannot be used in its original form was processed into interlocking brick blocks by using a ratio of cement to rock dust equal to 1:6 by weight, then adding water at a ratio of 20 percent of the cement content. Samples were molded and cured in water for 28 days. Testing for compressive strength and water absorption found that interlocking brick blocks made from concrete waste passed the Thai standards for Community Products no. 602/2004.