| Title |
A Study on the Estimation of Compressive Strength of Concrete by P Type Schmidt Hammer |
| Authors |
Han Cheon-Goo ; Lee Yong-Sung ; Kim Ki-Jeong |
| Keywords |
P Type Schmidt Hammer ; Estimation of Compressive Strength ; Rebound Value ; Age Factor |
| Abstract |
This study is intended to analyze the relationship between the rebound value of P type schmidt hammer and the compressive strength for a quality control of concrete by estimating compressive strength by use of P type schmidt hammer. According to the results, the compressive strength of standard curing specimen increases in proportion to age, but that of air curing specimen hardly increases after 28 days. The rebound value of P type schmidt hammer, however, increases due to carbonation of concrete in air curing specimen. The correlativity between the rebound value and the compressive strength is very favorable in the case of standard curing specimen, but drops remarkably in the case of air curing specimen. And, it is favorable in the range of 5-60MPa, so it is thought that estimation of compressive strength is possible even in high strength. According to the regulation of specifications in which water sprinkling curing should be conducted for 7 days, assuming air curing after that, the standard estimation formulas of compressive strength, which is derived from the basis of air curing at 28 days, are presented in this study, and the age coefficient is suggested. |