Development of controlled low-strength from recycled concrete activated by alkali for pavement engineering application

Abstract

Nowadays, the amount of waste generated from the demolition of buildings is increasing and tends to cause environmental problems in the future. Therefore, this research aims to study the mixture ratio of controlled low strength material (CLSM) using industrial waste materials. It consists of fly ash from Mae Moh Power Plant, natural sand, and recycled concrete from demolition building structures. and a solution of sodium hydroxide with high base properties as a solvent. for use in pavement engineering It will study the basic properties of engineering. And the power properties of the CLSM are in accordance with the ACI229R-99 standard and the road construction standards of the Department of Highways of Thailand. A solution of 10 molar sodium hydroxide was used as a leaching agent, and natural sand and recycled concrete were used as fine aggregate in the ratio of recycled concrete to 0, 25, 50, 75 and 100 percent of the CLSM samples . The basic CLSM engineering of the CLSM include slum loss, slum flow, setting time, bleeding, unit weight and unconfined compressive strength properties were tested. This is a key parameter for pavement design.