水泥稳定土的长期强度与耐久性研究

Long-term Strength and Durability of Soil Cement

研究如何评价长期暴露于含盐量很高的地下水的水泥稳定土的耐久性和抗压强度。研究发现,除用传统的质量损失率衡量水泥稳定土的耐久性外,还可以利用抗压强度作为评价其耐久性的指标。尽管水泥稳定土暴露于盐水约90天,其早期强度仍能保持增长,残余抗压强度随时间的发展趋近于定值,强度损失率变小。

This paper deals with durability characteristics and compressive strength of soil cement after prolonged exposure to saline ground water. The study was confined to three A-2-4 soils. In the analysis of the result the writer emphasizes the utilization of compressive strength as a competent indicator of durability in addition to the conventional percent mass loss. It was found that early ages compacted soil-cement mixtures continue to gain strength despite exposure to saline water up to about 90 days, then the strength deteriorates. The results also show that as time goes on the residual compressive strength converges to a certain value, and afterwards the rate of deterioration becomes very small. This value occurred at about 270 days for the tested soils. On the other hand, unconfmed compressive strength samples immersed in the saline ground water for up to 6 months continue to gain strength, although it was very slow after 28 days.