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本文采用内约束收缩应力方法研究了轻集料混凝土表观密度、水灰比、轻集料品种、不同矿物掺合料对混凝土收缩开裂的影响。结果显示,轻集料混凝土表观密度的降低增大了干燥收缩开裂趋势,过低过高的水灰比对干燥收缩开裂均有不利影响,粉煤灰、磨细矿渣粉、硅灰的掺入降低了收缩开裂风险,混凝土收缩开裂概率随着限制程度提高明显增大。
In this paper, the internal restraint shrinkage stress method was used to study the effect of apparent density, water-cement ratio, light aggregate varieties and different mineral admixtures on shrinkage and cracking of concrete. The results show that the decrease of apparent density of light aggregate concrete increases the tendency of shrinkage and cracking. Drying and shrinkage cracking is adversely affected by too low water / cement ratio. Fly ash, ground slag powder, Into reduces the risk of shrinkage cracking, concrete shrinkage cracking probability increases significantly with the limit increased.