流态淤泥固化土力学特性及流动性研究OA

To address the problems of low utilization efficiency and environmental pollution caused by dredged sludge engineering,this study adopts a mixture of magnesium oxide,slag,and polypropylene fiber to prepare flowable solidified soil.Flowability tests,unconfined compressive strength tests,scanning elec-tron microscopy(SEM),and X-ray diffraction(XRD)tests were conducted on flowable solidified soil speci-mens prepared with different moisture contents and various curing agent ratios.The results show that both wa-ter content and curing agent ratio have significant regulatory effects on the fluidity of solidified soil.Specifi-cally,increasing water content and slag content can improve the fluidity of solidified soil.When the mass ra-tio of magnesia to slag is 10∶10 and the water content is 70%,the fluidity of the sample reaches 188 mm.With the increase of magnesia content and the decrease of water content,the strength of solidified soil shows an overall linear growth trend,and its 28-day compressive strength can reach a maximum of 1.34 MPa.Microscopic analysis indicates that hydration products such as Mg(OH)2,C-S-H and C-A-H formed in the solidification system,together with the three-dimensional network structure interwoven by polypropylene fibers,exert a synergistic effect and jointly improve the mechanical strength of solidified soil.