- 劉 立，趙順增，李 娟，曹淑萍，吳 勇
引用本文摘 要：采用測試內約束收縮應力的方法研究了表觀密度、水灰比、輕集料品種、不同礦物摻合料及約束程度對輕集料混凝土干燥收縮開裂的影響。結果顯示，輕集料混凝土表觀密度的降低增大了干燥收縮開裂的趨勢，過低或過高的水灰比對干燥收縮開裂均有不利影響，輕集料種類則對收縮應力有一定影響；粉煤灰、磨細礦渣粉、硅灰的摻入降低了收縮開裂風險，混凝土收縮開裂概率隨著約束程度提高明顯增大。 Abstract: By using of the method of measuring the contracted stresses in restraint condition the influences of several factors, including apparent density, water cement ratio, type of lightweight aggregate, different mineral admixture and restraint degree, on the shrinkage cracking of lightweight aggregate concrete were studied by tests. And the rezults show that, the decrease of apparent density of lightweight aggregate concrete can increase the risk of dry shrinkage cracking, and too low or too high water/cement ratio also has negative influence on preventing the dry shrinkage cracking. The type of light aggregate has some effects on the shrinkage stress. The addition of fly ash, ground slag powder and silica fume will reduce the risk of shrinkage and cracking. And the cracking probability increases obviously with the increasing restraint degree.