高强低自收缩复合骨料混凝土早期开裂倾向的预估--高强低自收缩复合骨料混凝土的研究之三

通过对混凝土依时的自收缩应变和弹性模量测定,求得依时自收缩应力。结果表明，复合骨料混凝土的自收缩应力比基准混凝土以及硅灰混凝土和矿粉混凝土小得多，与混凝土的依时抗拉强度比较，复合骨料混凝土的早期开裂倾向显著降低.

Study on high strength low auto-shrinkage concrete with composite aggregate Ⅲ--Predication of early age cracking tendency of high strength low auto-shrinkage concrete with composite aggregate

On the basis of t of time-dependent auto-shrinkage strains and elastic modulus of concretes, the time-dependent auto-shrinkage stresses may be calculated. The results show that the auto-shrinkage stress in the concrete with the composite aggregate is much less than that in the reference concrete, especially in concrete containing silica fume and ground slag, Comparing with its time-dependent tensile strength the early age cracking tendency is reduced significantly by the composite aggregate in concrete.