矿物掺合料对混凝土塑性收缩裂缝的影响  

Influence of mineral admixtures on plastic shrinkage cracks in concrete

作　　者：曾国东 周敏 杨腾宇 邱冰 ZENG Guodong;ZHOU Min;YANG Tengyu;QIU Bing(Foshan Road and Bridge Upervision Corporation Limited.,Foshan 528000,China)

机构地区：[1]佛山市公路桥梁工程监测站有限公司,广东佛山528000

出　　处：《混凝土》2020年第3期105-107,116,共4页Concrete

摘　　要：针对高胶凝材料用量泵送混凝土早期塑性收缩开裂现象普遍存在并导致混凝土结构耐久性衰减的问题,进行了掺合料对混凝土早期塑性开裂的影响效果比对试验,研究了花岗岩石粉、粉煤灰对混凝土工作性、抗压强度、早期塑性抗裂性能的影响规律,结果表明:掺合料品种、掺量对混凝土早期塑性开裂性能影响差异显著,15%~20%掺量的粉煤灰或15%掺量的花岗岩石粉能有效降低混凝土早期开裂风险。Aiming at the problem of the durability attenuation of concrete structure in the early plastic shrinkage cracking phenomenon of high cementitious materials,the effect of admixture on the early plastic cracking of concrete is studied,and the effect of granite powder and fly ash on concrete workability,compressive strength and the effect of early plastic crack resistance,the results show that the mixed material varieties,dosage of concrete early plastic cracking performance difference significantly,15%~20%content of fly ash or 15%content of granite stone powder can effectively reduce the risk of early cracking of concrete.

关 键 词：混凝土 粉煤灰 花岗岩石粉 塑性开裂 

分 类 号：TU528.041[建筑科学—建筑技术科学]