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The impact of dry unit weight and cement content on the durability of sand-cement blends

机译：干燥单位重量和水泥含量对砂水泥混合物耐久性的影响

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摘要

Increasing the dry unit weight (γ_d) through vibration/compaction and the addition of Portland cement are among promising ground improvement procedures to enhance the endurance performance of granular materials. The present investigation intends to compute the impact of cement content (C) and γ_d on the durability of Osorio sand-Portland cement blends. An experimental programme of wetting-drying cycle tests considering distinct γ_d and C was carried out to assess that influence. A steadiness of the characteristic loss of mass (CLM) during 12 wetting-drying cycles for distinct specimens (of each particular γ_d and C) is observed and suggests a possibility of carrying out just a few cycles, making possible to extrapolate the results up to the required 12 cycles, reducing the time needed to assess the durability of such blends. It is also shown that the CLM of each specimen is reduced on increasing the γ_d and C. The CLM and accumulated loss of mass of compacted sand-cement mixes during wetting-drying cycles were originally perceived in the present research to be directly associated with the porosity/cement index. This broadens the applicability of such index, demonstrating that it controls not only the strength but also endurance performance of sand-cement blends.
机译：通过振动/压实增加干重（γ_d）和添加硅酸盐水泥是改善颗粒材料的耐久性能的有希望的地面改良方法。本研究旨在计算水泥含量（C）和γ_d对Osorio砂-波特兰水泥共混物耐久性的影响。进行了考虑不同γ_d和C的干湿循环试验的实验程序，以评估该影响。观察到了不同样本（每个特定γ_d和C）在12个干湿循环中的特征质量损失（CLM）的稳定性，并暗示了仅进行几个循环的可能性，因此有可能将结果外推至所需的12个循环，减少了评估此类混合物的耐久性所需的时间。还表明，随着γ_d和C的增加，每个样品的CLM降低。在本研究中，最初认为在干湿循环中压实的砂水泥混合物的CLM和累积质量损失是与水泥干度直接相关的。孔隙率/水泥指数。这拓宽了该指数的适用范围，表明它不仅控制了砂水泥混合物的强度，而且还控制了其耐久性能。

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