| Title |
Properties of Strength Development of Concrete at Early Age with Water Cement Ratio and Cement Factor |
| Authors |
Han Cheon-Goo ; Hwang Yin-Seong ; Lee Seung-Hoon ; Kim Gyu-Dong |
| Keywords |
물시멘트비(W/C) ; 시멘트 요인 ; 초기압축강도 ; P형 슈미트햄머물시멘트비(W/C) ; 시멘트 요인 ; 초기압축강도 ; P형 슈미트햄머 |
| Abstract |
This study discusses compressive strength development of concrete at early age with water cement ratio(W/C) and cement factors. According to the results, as W/C decreases, compressive strength at early stage increases. It takes about 15 hours, 17.5 hours and 21 hours in W/C of 40%, 45% and 50%, respectively, to gain 5MPa of concrete strength, so it can be shortened by about 3 hours with every decrease of W/C of 5%. Compressive strength of ordinary portland cement(OPC) A at early age is larger than that of OPC B, and so it proves that the strength variances among the cement manufacturing company exist to some degree. As for the kinds of cement, compressive strength shows larger value in order of alumina cement(ALC), high-early- strength portland cement(HPC) and OPC. When OPC is replaced with HPC by 50%, compressive strength at early age increases in comparison with that of OPC. When OPC is replaced with ALC by 5% and 10%, setting time is shortened, but compressive strength at early age decreases in comparison with OPC. As fineness of cement increases, compressive strength at early age also increases. As compressive strength development at early age increases, the time to gain 5MPa |