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目前,设计普通混凝土配合比,采用确定砂率的方法计算砂石用量,应用较为普遍。而砂率的确定,又以查表法和公式计算法应用较广。这两种方法各有所长,但均需根据砂子的粗细程度及水泥用量等进行修正。本文介绍的砂率速算公式,是传统的计算砂率公式的简便算法,并根据经验加以改进,应用效果较好。一、速算公式推导常用计算砂率公式如下: S=k eγs/γ_g+eγ_s (1) 式中S——砂率,即砂与砂石的重量比; k——拨开系数,机械振捣时k=
At present, the design of ordinary concrete mix ratio, the use of sand determination method to calculate the amount of sand, the application is more common. The determination of the sand rate, in turn, the use of table lookup method and formula calculation method is wider. Both methods have their own merits, but they all need to be corrected according to the thickness of the sand and the amount of cement used. The sand rate calculation formula introduced in this paper is a simple and convenient algorithm for calculating the formula of sand rate, and it is improved based on experience. The application effect is good. First, the formula for calculating the commonly used calculation sand rate derivation is as follows: S = k e γ s / γ _g + e γ s (1) where S - sand ratio, that is, the weight ratio of sand and gravel; k - open coefficient, mechanical vibration Time k=