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过去曾经确定,在构筑物滑模施工过程中,混凝土出模时的结构强度以0.1～0.25为宜。而且,在这一硬化期限内,构筑物外部混凝土的结构强度与其内部混凝土强度相差很大。这种差别不仅因为外部气温,而且和水泥品种,水泥用量、化学外加剂的种类与数量、构筑物的平面几何尺寸以及结构中的混凝土体积有关。构筑物采用滑模施工时,混凝土强度的测定,对确定混凝土的最佳浇灌速度致为必要。当混凝土的浇灌速度大于最佳值时,钢筋爬杆可能发生变形,混凝土保护层可能剥落;当混凝土的浇灌速度小于最佳值时,混凝土结构往往产生裂缝和破损现象。
It has been determined in the past that during the construction of the sliding form of the structure, the structural strength of the concrete at the time of mold ejection is preferably 0.1 to 0.25. Moreover, within this hardening period, the structural strength of the concrete outside the structure differs greatly from the strength of its internal concrete. This difference is not only due to external air temperature, but also related to the type of cement, the amount of cement, the type and amount of chemical admixture, the plane geometry of the structure, and the volume of concrete in the structure. When the structure is constructed using sliding mode, the determination of the concrete strength is necessary to determine the optimal watering rate of the concrete. When the concrete grouting speed is greater than the optimal value, the steel reinforcement rods may be deformed, and the concrete protection layer may peel off. When the concrete grouting speed is less than the optimal value, the concrete structure often produces cracks and breakage.