钢筋砼建筑物的裂缝原因,属于由温度、收缩、膨胀、不均匀沉降等变形变化引起的约占80%,属于由于荷载引起的约占20%。为了控制砼的裂缝,国内外从不同的角度已有很多裂缝控制措施,如设计上留置永久伸缩缝;在易产生裂缝的区域提高构造配筋率;设置临时性伸缩缝,即后浇缝,或采用“跳仓打”的办法;在大体积砼工程中,采用低热矿渣水泥、掺加粉煤灰、缓凝剂、预埋水管和冷却骨料等,以降低砼的水化热温 The cause of cracks in reinforced concrete buildings is about 80% due to changes in temperature, shrinkage, expansion, differential settlement, etc., and is about 20% due to loads. In order to control cracks in concrete, there have been many crack control measures from different angles at home and abroad, such as designing permanent expansion joints; increasing the structural reinforcement ratio in areas where cracks are likely to occur; setting temporary expansion joints, ie, post-sealing joints, Or use the method of “being to jump and fight”; in the large volume concrete project, low-heat slag cement, fly ash, retarder, pre-buried water pipe and cooling aggregate are adopted to reduce the heat of hydration of the crucible.