Curing Mechanism and Influencing Factors of Cement Mixing Piles Reinforcing Peat Soil
The cement mixing pile is used to reinforce the deep peat soil foundation in Malaysia's east coast railway construction.The key in this project is to determine the cement mix proportion and additives.Considering the high organic matter content and strong environmental acidity of coastal peat soil,physical and mechanical tests of peat soil and laboratory uniaxial compression tests of cement soil under different mix proportions and influencing factors were conducted.Test results show that the mean compressive strength decreases by 0.35 MPa with the increase in cement-water from 0.5 to 0.9.Adding mineral powder gives a relatively poor curing effect while adding fly ash or gypsum contributes an obvious improvement.The curing agent increases the early strength by about 189.29%with strength beginning to increase from 7 d.Compared with ordinary Portland cement,sulfate-resistant cement increases the curing effect on peat soil by 9.5%,and this technique shows a better curing effect on peat soil with an increase of the mean compressive strength by 127%compared with soft plastic silty clay.
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