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1 前 言混凝土的开裂主要是由于混凝土中拉应力超过了抗拉强度 ,或者说是由于拉伸应变达到或超过了极限拉伸值而引起的 .混凝土干缩、降温冷缩及自身体积收缩等收缩变形 ,受到基础及周围环境的约束时 (限制收缩 ) ,在混凝土内产生拉应力 ,并可能引起混凝土裂缝 .沙牌碾压混凝
1 Introduction Cracking of concrete is mainly due to the tensile stress in concrete exceeds the tensile strength, or because the tensile strain reaches or exceeds the ultimate tensile value caused by concrete shrinkage, cooling shrinkage and contraction of its own volume contraction Deformation, subject to the constraints of the foundation and the surrounding environment (restricted shrinkage), tensile stress in the concrete, and may cause concrete cracks. Sand licensing RCC