| Title |
A Study on the Estimation of Compressive Strength of Concrete by Non-Destructive Tests |
| Keywords |
Non-destructive test ; Rebound number ; Ultrasonic pulse velocity ; Compressive strength ; |
| Abstract |
The purpose of this study is to suggest the non-destructive equation for the estimation of compressive strength of concrete by rebound hammer, ultrasonic pulse velocity and combined method. To improve the proposed non-destructive equation under domestic situation in Korea, more than 1,700 test data domestically available in the literature and having the range of 100 to 1,200kgf/cm2 as compressive strength of concrete were collected and analyzed statistically.
As a rusult of this study, it is possible to predict the compressive strength of concrete and the equations for prediction are following.
1) Fc≤600kgf/cm2
① Fc = 9.2R + 10 ② Fc = 210.7Vp - 608 ③ Fc = 6.7R + 183Vp - 692 ④ Fc = k1R + k2Vp + k3(W/C) + k4B + k5AGE + k6CRC + k7(S/a) +k8BS+ k9G + k10
2) Fc≤1200kgf/cm2
① Fc = 0.56R2 - 17.7R + 322 ② Fc = 350.3Vp2 - 2502Vp + 4620 ③ Fc = 0.0176C2 - 1.1C + 148
④ Fc = k1C2 + k2C + k3(W/C) + k4BS + k5CRC + k6AGE + k7G +k8(S/a)+ k9B + k10
Where, Fc : compressive strength(kgf/cm2), R : rebound number, Vp : ultrasonic pulse velocity(km/s),
C, W/C, B, AGE, CRC, S/a, BS, G, k1-k10 : see equation (10), (11) |