水泥改良细砂类土延迟时间对强度和干密度的影响

以东北某新建Ⅰ级国铁项目特定的细砂类土为研究对象,在特定的水泥掺量下,做了不同延迟时间下的室内击实试验,并在标准养护7 d后,做饱和无侧限抗压试验。根据大量室内试验数据,分析了特定水泥掺量下水泥改良细砂类土的延迟时间对最大干密度以及7 d饱和无侧限抗压强度的影响,得到了最大干密度以及7 d饱和无侧限抗压强度随延迟时间的变化规律,给出了简便适用的计算公式,对此类土的科学施工及质量控制起到了较好的指导作用。

Impact of the Cement Improved Fine Sandy Soil Delay Time upon Its Strength and Dry Density

In this paper, the specific fine sandy soil of a new northeast grade I national railway project was used for the study. In particular cement dosage, the author made indoor compaction tests under different delay time, and did saturated unconfined compression tests 7 days later after the standard curing. According to a large number of laboratory test data, this paper analyzed the impact of the cement improved fine sandy soil＇ delay time on its maximum dry density and saturated un- confined compressive strength 7 days later after the standard curing under the particular cement dosage, then elicited the maximum dry density and 7-day saturated unconfined compressive strength with the variation of the delay time. A simple and applicable formula was given, which played a good guide to on scientific construction and quality control of this type soil.