Analysis on the strength of abandoned soil improved by composite cement solidification curing agent

Aiming at the problem that the abandoned soil after engineering excavation is difficult to reuse, a Composite Cement Solidification curing agent is proposed (CCS) is proposed. It is a mixture of 10% superfine cement and 90% ordinary Portland cement, which improves organic silty clay spoil and clay spoil respectively. Based on the unconfined compressive strength test results, the strength development law of CCS-modified organic silty clay spoil and clay spoil was explored. The results show that the compressive strength development law of the two types of spoils shows certain similarities. That is, the compressive strength of the sample increases with the increase of CCS content and curing age. And when the CCS content increases to 17.5%, the compressive strength growth rate is the fastest. Comprehensive analysis shows that 17.5% CCS content is the best content. There are also differences in the effects of improved silty clay and clay. That is, the compressive strength growth rates of the two are different, and they are divided into a rapid strength increase stage (within 28 days) and a steady strength increase stage (28 days to 90 days) to analyze the mechanism of the compressive strength change of the two samples.