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Effect of Powder-to-Voids Ratio on Bleeding Process of Fresh Concrete

机译：粉末到空隙率对新混凝土渗流过程的影响

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Part of free water in fresh concrete bleeds out and results in problems of hardened concrete. In order to explore the determinant factors to control bleeding process and effecting mechanism, a series of mix samples in various water-to-cement ratios and sand ratios for different slump requirements were prepared to test their bleeding rates. Then the parameters to control bleeding process of fresh concrete and their influencing factors were investigated by regression analysis. The results reveal that percent volume of powder in mix (β_p) and the ratio of powder to voids between sand particles (p/v) are key factors to control bleeding speed, and p/v also controls the dormant time of bleeding. The sand ratio influences the bleeding process by changing the value of p/v. Both β_p and p/v have their critical values and optimum ranges. When p/v=0.78~0.87, the bleeding can be regulated to Late-Slow type with the least harm to properties of hardened concrete.
机译：新鲜混凝土出血的一部分自由水，并导致硬化混凝土问题。 为了探讨控制出血过程和效应机制的决定因素，制备了一系列用于不同坍落度要求的各种水与水泥比和砂比的一系列混合物样品以测试它们的出血率。 然后通过回归分析研究了控制新鲜混凝土的出血过程的参数及其影响因子。 结果表明，混合物（β_P）中粉末百分比和粉末颗粒（P / V）之间的粉末与空隙的比例是用于控制出血速度的关键因素，P / V还控制出血的休眠时间。 砂比通过改变p / v的值来影响出血过程。 β_P和P / V都具有它们的临界值和最佳范围。 当P / V = 0.78〜0.87时，出血可以调节到后慢型，对硬化混凝土的性能最小危害。

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