Abstract
The influence of chemical admixtures on early shrinkage cracking of concrete with different water cement ratio was studied by using flat shrinkage die. Plate method is an excellent way to investigate the effect of admixture on the shrinkage crack of fresh concrete from the early state to hardening, which is in line with the actual engineering situation. Early shrinkage cracking of concrete is influenced by the factors of early shrinkage and strength. When the water cement ratio is lower, the early shrinkage of concrete dominates the early cracking resistance of concrete. On the contrast, when the water cement ratio is higher, the strength development of concrete is the dominant factor affecting the cracking. The effect of high efficiency water reducing agent on the early shrinkage and cracking resistance performance of concrete is depend on its water cement ratio; when the water cement ratio is high, more high efficiency water reducing agent would correspond to a better early shrinkage and cracking resistance properties of concrete; when the water cement ratio is low, more high efficiency water reducing agent would correspond to a worse early shrinkage and cracking resistance properties of concrete.
