| Title |
An Experimental Study on the Early Strength Estimation of High Strength Concrete by Microwave Heating Technique |
| Authors |
Kim Min-Suk ; Jung Keun-Ho ; Paik Min-Su ; Kim Sung-Sik ; Jung Jae-Wook ; Jung Sang-Jin |
| Keywords |
Early Strength Estimation ; Microwave Heating Technique ; High Strength Concrete |
| Abstract |
Compressive strength of concrete is considered it's most valuable property among the mechanical properties of concrete. but, If 28 days passes by, there is a quality badness in concrete. That concrete building is mandatory to repair, reinforce or remove after 28days. The early strength estimation method is required on the placing time. The new early strength estimation method solved that kinds of problems is Microwave use method. In this study, it is analyzed that factors and correlation of early strength estimation using high strength concrete. This experimental study gives the fundamental data which help a efficient quality control of real construction field. The result of this study is belows.
(1) Both high strength concrete and normal, Strength develops in accelerating strength as W/C goes lower and as curing time is increase, the more accelerating strength develops.
(2) In case of high strength concrete, the determination coefficient that between accelerated compressive strength and 28 days strength are 0.97 and the other case of normal, it that between accelerated compressive strength and 28 days strength is 0.94.
(3) The determination coefficient that between accelerated compressive strength in the job mixing proportion that is applied to concrete experiment, 7 days strength and 28 days strength are 0.87, 0.92.
Above result of the experiment shows that the strength estimation method with microwave can be appied to high strength concrete. It needs a many experiments to supplement correlations. The effort to reduce the deflection and increase the accelerating strength is required that have consideration to depend on. |