Effect of cement admixture on the physical properties of cement soil under low-pressure curing
In order to investigate the effect of different cement contents on the physical properties of cement soil under low-pressure curing environment,a self-made low-pressure test chamber was used to simulate the curing conditions of cement soil in high-altitude areas.The influence of cement content(12％,15％,18％)on the density,water absorption rate,porosity and unconfined compressive strength of cement soil under different low-pressure gradients(100 kPa,70 kPa,40 kPa)curing for 7 d and 28 d was studied.The re-sults indicate that low-pressure curing has a significant effect on the density,water absorption,porosity,and compressive strength of ce-ment soil.When the cement content is 12％,the cement soil density is highest under different low-pressure curing and different age conditions.At 7 d,the water absorption rate of cement soil decreases with the increase of cement content under the same low pressure.For porosity,appropriate cement dosage can promote a decrease in porosity of cement soil,while low-pressure curing and prolonged ag-ing can lead to an increase in porosity of cement soil.Under low-pressure curing,reducing the amount of cement can increase the com-pressive strength of cement soil,save costs,and enhance the mechanical properties of cement soil.
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