This article analyzes the causes of the lower surface strength in some practical concrete projects, discusses the influence of fly ash on the concrete surface strength.
对部分混凝土工程实例中表面强度偏低的原因进行分析，论述了粉煤灰对混凝土表面强度的影响。
Expansive cement paste and joint concrete are next. And the bond splitting tensile strength of joint surface without bond material is least.
其次是水泥膨浆和接缝混凝土，接缝面不铺筑任何接缝面材料的试块，劈裂抗拉强度最小。
A simple formula for calculating pure shear strength of concrete is derived on the basis of the verified mathematical model of concrete failure surface, the elliptic paraboloid.
本文根据已论证过的混凝土破坏面，即椭圆抛物面的数学模型，报导出一个用以计算混凝土纯剪强度的简单公式。
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