Study on Mechanical Properties and Microscopic Characteristics of FPCC Improved Over-Wet Soil
In order to improve the strength of over-wet soil and make rational use of industrial solid waste,coal ash-phosphorus slag-carbide slag-cement cementitious material(referred to as FPCC material)prepared by fly ash,phosphorus slag,carbide slag and cement was used to improve over-wet soil.The unconfined compressive strength test,California bearing ratio(CBR)test,compressive rebound modulus test and scanning electron microscope(SEM)test were carried out on the FPCC over-wet soil with the content of 4%,6%,8%,and 10%respective-ly.The pore characteristics and distribution were observed by Matlab software and Image-Pro Plus(IPP)software,and the mechanical prop-erties and microscopic characteristics of FPCC cementitious materials and improved over-wet soil were analyzed.The results show that the FPCC cementitious material has a significant effect on the improvement of overwet soil.When 6%FPCC is added,all indexes of 28 d age meet the requirements of use.A large number of hydration products are produced in FPCC over-wet soil at 28 d age,and the hydration prod-ucts increase with the increase of dosage.With the increase of FPCC cementitious material,the internal porosity of the soil decreases,the pore diameter decreases,the pore abundance increases and the pore orientation angle is ordered.It can be seen that the FPCC cementitious material and the improved over-wet soil have good strength and bearing capacity.Considering the saving of cement dosage and the more ration-al use of industrial solid waste,it is recommended that the FPCC content is 6%.
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