砂率：SP= 砂的用量S/(砂的用量S+石子用量G)×100% 是混凝土中砂的质量占砂、石总质量的百分率。 砂率的变动，会使骨料的总表面积有显著改变，从而对混凝土拌合物的和易性有较大影响。 确定砂率的原则是：在保证混凝土拌合物具有的粘聚性和流动性的前提下，水泥浆最省时的最优砂率。
浅析泵送混凝土用粗细砂_建筑工程 关键词】泵送混凝土标号；砂率；细度模数；措施 [gap=1121]Key words】Pumping concrete grade；Percentage of sand；Fineness modulus；Measures
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... probability of ensuring strength of concrete，混凝土强度保证率 sand rate，砂率 unit consumption of water，单位用水量 ...
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Dense aggregate gradation, under the satisfaction of workability, low sand percentage and high content of coarse aggregates plus early strength retarding water reducing agent are found to reduce breakages in cement concrete pavements that of dense aggregate gradation.
采用密实型集料级配、在满足和易性要求前提下采用较低的砂率和较高的粗集料含量、在混凝土中加入缓凝型早强减水剂，能有效减少混凝土路面的早期断板。
参考来源 - 水泥混凝土路面早期断板影响因素与防治技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
具体储层的临界流速，油井出砂率，挡砂层的挡砂率是该技术的成功核心。
The critical flow velocity of reservoir, sand production rate of oil well and sand control rate of sand retention layer are the key of the technology that is successfully used.
在强度和工作性相当的情况下，随着砂率的增大，混凝土出现裂缝的机会增加了。
If the strength and workability are approximate identical, concrete tends more easily to crack with the increasing sand rate.
对于突堤下游的冲刷过程的计算，考虑了由于沿岸波高变化对沿岸输砂率的影响。
In computation of shoreline erosion on the downdrift side of that port breakwater, the influence of the variation of longshore breaker height is considered.
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