Authors : Jamil Matarul, Chiew Fei Ha, Md. Abdul Mannan, Azmi Ibrahim and Ezze Elma binti Mohd. Yusof
Abstract: Non-destructive method monitoring or service life prediction of concrete structures is becoming crucial interest to engineers. The good conceptual understanding between non-destructive method and destructive method is essential to ensure that optimum concrete performance is achieved before a costly repair to the structure becomes necessary. This study was conducted to determine the relationship between the compressive strength and the Ultra-sonic Pulse Velocity (UPV) on the concrete partially replaces the cement content (by mass percentages) with local fly ash. Furthermore, R2 was indicating the advantages of UPV against compressive strength. The experiment was investigated using grade concrete of G35 and G45 supplied by local ready mixed concrete in Kuching Sarawak. The cement content for each concrete grade was replaced with fly ash about 10% percentage increment from 20- 60%. Waste material (Fly ash) used as cementitious material were collected from single main local supplier in Pending Sarawak. The specimens used in the studies were made of 150 mm concrete cube. Specimens tested for UPV then followed by compressive strength at the age of 14, 28, 56, 90 and 180 days. In which curing age extended to 56 and 90 days to participated delay setting time of ready mixed concrete enhance by fly ash. Meanwhile, 180 days conducted for long term correlation between compressive strength and UPV purpose. Based on the compressive strength and UPV tests conducted in both concrete grades, clear linear regression relationship was drawn to describe highly agreement between two parameters measured. Compressive strength vs. UPV correlation curves were recorded R2 values of 0.776 and 0.807 for G35 and G45, respectively. Therefore, the higher values of R2 indicate using UPV as non-destructive method was develops greater confidence to replace destructive method (compressive strength) for long term strength monitoring with fastest and low cost testing method.
Jamil Matarul, Chiew Fei Ha, Md. Abdul Mannan, Azmi Ibrahim and Ezze Elma binti Mohd. Yusof, 2019. Relationship Between Compressive Strength and Ultra-Sonic Pulse Velocity (UPV) of Local Fly Ash Concrete. Journal of Engineering and Applied Sciences, 14: 6085-6088.