外掺材料对滨海水泥土压缩特性的影响研究

Study on the Effect of External Blending Materials on the Compressive Properties of Coastal Cement Soil

为探究复合改性水泥土的加固机理,对滨海水泥土,分别掺入纤维、纤维+再生砂、纤维+纳米黏土、纤维+粉煤灰,进行了固结压缩试验和SEM微观测试.试验结果表明:纤维+再生砂复合改性水泥土与单掺纤维改性水泥土相比,反而降低了水泥土的抗压缩性能;纤维+纳米黏土或纤维+粉煤灰复合改性水泥土与单掺纤维改性水泥土相比,均可增强水泥土的抗压缩性能,其中复掺纤维+粉煤灰改性效果最好;从SEM图中可看出掺入纳米黏土或粉煤灰后,土颗粒间孔隙被胶凝物质填充,土体结构更加致密,进而提高了水泥土的抗压缩性能.

In order to investigate the reinforcement mechanism of composite modified cement soil,consolidation tests and SEM microscopic tests were conducted on coastal cement soils,mixed with fiber,fiber+recycled sand,fiber+nano-clay and fiber+fly ash,respectively.The experimental results show that:in comparison with single fiber modified cement soil,the composite modified cement soil with fiber+recycled sand has lower compression resistance;fiber+nano-clay and fiber+fly ash composite modified cement soils can both enhance the compression resistance of the cement soils,and the compound fiber+fly ash modification effect is the better;the SEM diagrams display that the soil pores are filled with cementitious material and the soil structure is more dense when mixed with nano-clay or fly ash,thus improves the compression resistance of the cement soil.