Shen Jiansheng, Xu Yidong, Chen Jian, Wang Yao
School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China.
School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, China.
Materials (Basel). 2019 Mar 11;12(5):826. doi: 10.3390/ma12050826.
The use of desulfurization gypsum and steel/furnace slag composite cementitious material (DGSC) to solidify soft soil can fully utilize industrial wastes, reduce cement use and protect natural resources. By studying the unconfined compressive strengths of DGSC-solidified soil with different mix ratios, water-binder ratios and curing periods, the influence of those factors on the unconfined compressive strength of the soil can be analyzed. Furthermore, the quasi-water-cement ratio is introduced to predict the strength of the DGSC-solidified soil. The results show that the higher the DGSC content is, the better its effect on the soft soil. The variation in the unconfined compressive strength of DGSC-solidified soil overtime can be described by the same trend as that of cement-solidified soil but its early strength is lower than that of cement-solidified soil. When the water-binder ratio of the DGSC-solidified soil is the same as that of the cement-solidified soil, after a28-day curing period, the content of DGSC is higher than that of the 5% cement content, so the DGSC solidification effect is comparable to that of cement. Therefore, using DGSC instead of cement as a soft soil solidifying agent can meet the strength requirements of solidified soil.
利用脱硫石膏与钢渣/炉渣复合胶凝材料（DGSC）固化软土能够充分利用工业废弃物，减少水泥用量并保护自然资源。通过研究不同配合比、水胶比和养护龄期的DGSC固化土的无侧限抗压强度，可分析这些因素对土的无侧限抗压强度的影响。此外，引入准水灰比来预测DGSC固化土的强度。结果表明，DGSC含量越高，其对软土的固化效果越好。DGSC固化土的无侧限抗压强度随时间的变化趋势与水泥固化土相同，但其早期强度低于水泥固化土。当DGSC固化土的水胶比与水泥固化土相同时，养护28天后，DGSC的含量高于5%水泥含量时的情况，因此DGSC的固化效果与水泥相当。所以，用DGSC代替水泥作为软土固化剂能够满足固化土的强度要求。
