Study Properties of Concrete Manufactured with Multi-Recycled Concrete Aggregate

Abstract

This research aimed to reduce environmental problems caused by the fraction of waste concrete, by studying properties of concrete which mixed with recycled aggregate concrete (RCA) and concrete which mixed with repetitive recycled concrete aggregate (MRCA), including density testing, water absorption testing, compressive strength testing and the corrosion performance testing of reinforcing steel which used half-cell potential test, and comparing the results of the tests with the results of natural mixed concrete (NCA). The calculation of the mixture used RCA and MRCA replacement NCA in mixing ratios percentages 25, 50, 75, and 100 by volume, respectively. Compressive strength was designed at 240 kg/cm². The experiment showed that when replacing 25% of RCA and MRCA, it has the highest density and compressive strength, and have highest water absorption when replaced by 100. The corrosion performance testing using half-cell potential test would have the slowest rust on reinforcement steel and highest half-cell electric potential which make concrete cracks at 17 days when replaced by 25. And it would have the highest rust on reinforcement steel and highest half-cell electric potential which make concrete cracks at 5 days when replaced by 100. The results revealed that the density and compressive strength would decrease as the replacement ratio of RCA and MRCA increases. The water absorption would increase with the increasing ratio of RCA and MRCA. And the rate of rusting of the reinforcement steel would increase with the increasing replacement ratio of RCA.

This research aimed to reduce environmental problems caused by the fraction of waste concrete, by studying properties of concrete which mixed with recycled aggregate concrete (RCA) and concrete which mixed with repetitive recycled concrete aggregate (MRCA), including density testing, water absorption testing, compressive strength testing and the corrosion performance testing of reinforcing steel which used half-cell potential test, and comparing the results of the tests with the results of natural mixed concrete (NCA). The calculation of the mixture used RCA and MRCA replacement NCA in mixing ratios percentages 25, 50, 75, and 100 by volume, respectively. Compressive strength was designed at 240 kg/cm². The experiment showed that when replacing 25% of RCA and MRCA, it has the highest density and compressive strength, and have highest water absorption when replaced by 100. The corrosion performance testing using half-cell potential test would have the slowest rust on reinforcement steel and highest half-cell electric potential which make concrete cracks at 17 days when replaced by 25. And it would have the highest rust on reinforcement steel and highest half-cell electric potential which make concrete cracks at 5 days when replaced by 100. The results revealed that the density and compressive strength would decrease as the replacement ratio of RCA and MRCA increases. The water absorption would increase with the increasing ratio of RCA and MRCA. And the rate of rusting of the reinforcement steel would increase with the increasing replacement ratio of RCA.