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针对目前应用混凝土平板法试验、抗裂系数评价高性能混凝土的抗裂性能过程中,尚存在的不足之处,从吹风起始时间、抗裂系数计算参数选取等角度,对低水胶比粉煤灰混凝土、大掺量磨细矿渣混凝土的抗裂性能进行比较。结果表明:平板法试验时,吹风起始时间对混凝土的表面裂缝状况有显著的影响,在混凝土初凝之前,吹风起始时间越早,混凝土表面出现的开裂现象越严重,不同掺合料混凝土所表现出来的抵抗塑性开裂能力的差距越明显;抗裂系数计算时,养护龄期,特别是混凝土干缩龄期对混凝土的抗裂性评判结果影响显著。
In view of the current application of concrete slab test and crack resistance evaluation of anti-cracking performance of high-performance concrete, there are still some shortcomings. From the starting time of hair blowing and the selection of calculation parameters of anti-cracking coefficient, Crack resistance of coal-ash concrete and high-volume ground slag concrete were compared. The results show that the initial blowing time has a significant influence on the surface cracks of concrete during the flat plate test. Before the initial setting of the concrete, the earlier the blowing start time, the more serious cracking occurs on the concrete surface. Different admixture concrete The more obvious the difference between them is. The longer the curing age, especially the dry age of concrete, has a significant influence on the crack resistance evaluation of concrete.