The cement-mixed soils technique is an efficient solution to improve the ground geomechanical properties in infrastructures and construction projects. This paper presents a systematic laboratory study to investigate the optimum water-to-cement ratio existence on the unconfined compressive strength. The soil compaction is controlled during these tests. The results showed that the maximum unconfined compressive strength was not only controlled by the porosity but also the water-to-cement ratio. The results indicated that the optimum range of water-to-cement ratio to mobilize the maximum strength is between 0.75 and 1.25 while the optimum water content is around 15%, and is quite stable for various cement content. Besides, the unconfined compressive strength decreased with increasing the water-to-cement ratio, and the reduction is more significant for higher cement contents. It seems that high cement content could be not sufficient for a large water-to-cement ratio. Finally, a new index, namely, the combined volume ratio is proposed for the strength analysis of cement-mixed sands. Using this index, the unconfined compressive strength of cement-mixed soils can be reasonably predicted. The combined volume ratio allows selecting the ratio of water and cement volume to ensure that the void volume is minimized, and the strength is therefore maximized.

水泥混合土技术是改善基础设施和建设项目中地面地质力学性能的有效解决方案。本文提供了系统的实验室研究，以研究无侧限抗压强度的最佳水灰比。在这些测试中控制土壤压实度。结果表明，最大无侧限抗压强度不仅受孔隙度的影响，还受水灰比的控制。结果表明，调高最大强度的水灰比的最佳范围在0.75至1.25之间，而最佳水含量在15％左右，并且对于各种水泥含量都相当稳定。此外，随着水灰比的增加，无侧限抗压强度降低，对于更高的水泥含量，减少幅度更大。似乎高水泥含量不足以实现大的水灰比。最后，提出了一种新的指标，即混合体积比，用于水泥搅拌砂的强度分析。使用该指标，可以合理地预测水泥混合土的无侧限抗压强度。组合体积比允许选择水与水泥体积的比例，以确保将空隙体积最小化，并因此使强度最大化。可以合理地预测水泥土的无侧限抗压强度。组合体积比允许选择水与水泥体积的比例，以确保将空隙体积最小化，并因此使强度最大化。可以合理地预测水泥土的无侧限抗压强度。组合体积比允许选择水与水泥体积的比例，以确保将空隙体积最小化，并因此使强度最大化。