摘要
在高温干燥环境中,混凝土失水剧烈、凝结过快,易于产生开裂,导致混凝土强度和耐久性能显著降低。试验对比研究了常温和干热环境下,辅助性胶凝材料对C20和C30混凝土力学性能、体积稳定性和耐久性的影响。结果表明:(1)与常温养护相比,高温干燥环境中混凝土抗裂性能显著变差;(2)高温环境更有利于激发辅助性胶凝材料的水化活性,大掺量辅助性胶凝材料混凝土的力学性能下降幅度较小,更重要的是混凝土抗裂性能得到显著改善,使其体积稳定性与耐久性得到大幅度提高。
In dry-hot environment, concrete presents high risk of plastic cracking due to fast hydration and water lose, and eventually leads to reduction of mechanical properties and durability of concrete structures. In this paper, effects of supplementary cementitious materials （SCMs） on mechanical properties, volume stability and durability of C20-C30 concrete were investigated. Particularly, influ- ences of dry-hot and normal curing environment on the properties of concretes were compared. The result shows： （ 1 ） Compared with normal curing environment, the dry-hot environment significantly increases the cracking risk of concrete. （2）However, the reaction ac- tivity of SCMs is enhanced dramatically under dry-hot environment, the mechanical properties of concretes with large amount of SCMs decreased slightly. More importantly, the addition of SCMs led to a superior cracking resistance, resulting in a substantial improvement of volume stability and durability of concrete.
出处
《水泥工程》
CAS
2015年第5期81-84,89,共5页
Cement Engineering
关键词
混凝土
高温干燥环境
体积稳定性
辅助性胶凝材料
concrete
dry-hot environment
volume stability
supplementary cementiitious materials
