Permeability of Peat Soil Solidified by Composite Cement Solidification Agent
In response to the challenges of poor engineering properties and the high difficulty in improving peat soil,a composite cement solidification agent(CCS)comprising ultra-fine cement(UFC)and ordinary Portland cement(OPC)was proposed for the solidification of simulated peat soil.The influence of UFC on the permeability of cement-soil samples was investigated through osmotic pressure tests and X-ray diffraction(XRD)experiments.Osmotic pressure tests results indicate that,under constant CCS dosage,the permeability coefficient k of specimens decreases with increasing UFC mass fraction,with a significant attenuation of the decreasing trend observed when the UFC mass fraction exceeds 12％.For CCS with a UFC mass fraction of 12％,k decreases with increasing CCS dosage,and the declining trend is notably attenuated when the dosage exceeds 25％.XRD results indicate that the diffraction peak intensity of calcium silicate hydrate(C-S-H)in the samples increases with both the increase in the UFC mass fraction and the curing time.Compared to OPC,CCS achieves superior solidification efficiency with a reduced cement dosage,facilitating the attainment of carbon reduction objectives.
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