外加剂对商品混凝土早期收缩开裂有一定影响。极低的水灰比,较长时间的缓凝,会使混凝土长期处于塑性状态,加大混凝土的早期收缩。控制一定减水率及缓凝时间,并提前进行保湿养护有利于防止商品混凝土早期收缩开裂。 Admixture of commercial concrete early shrinkage cracking have a certain impact. Very low water-cement ratio, longer setting retardation, will make the concrete in long-term plastic state, increase the concrete early contraction. Control of a certain water reduction and retarding time, and early moisturizing conservation is conducive to preventing early commodity shrinkage cracking.