石灰土和水泥土的减水剂改性效果

发布时间：2018-06-30 21:48

本文选题：软土 + 萘系高效减水剂　；参考：《建筑材料学报》2017年02期

【摘要】：测试了萘系高效减水剂对软土无侧限抗压强度、抗剪强度、压缩性和水稳定性的改性效果,研究了减水剂作为添加剂对石灰改良软土(石灰土)和水泥改良软土(水泥土)无侧限抗压强度的影响,并采用扫描电镜观测了软土改性前后的微观结构.结果表明:萘系高效减水剂能改善软土的力学性能和水稳定性,进一步提高石灰土的无侧限抗压强度;减水剂掺入顺序对水泥土无侧限抗压强度影响很大,先在软土中掺入水泥,闷料6h后再掺入减水剂的顺序能提高水泥土的无侧限抗压强度,特别是其早期强度提高显著;经萘系高效减水剂改性后,软土呈相互交错的不规则结构,石灰土和水泥土中水化产物变得更丰富且分布更均匀.
[Abstract]:The modification effects of naphthalene superplasticizer on the unconfined compressive strength, shear strength, compressibility and water stability of soft soil were tested. The effect of water reducer as additive on the unconfined compressive strength of lime modified soft soil and cement modified soft soil was studied. The microstructure of soft soil before and after modification was observed by scanning electron microscope. The results show that naphthalene superplasticizer can improve the mechanical properties and water stability of soft soil, and further improve the unconfined compressive strength of lime soil, and the mixing order of water reducer has a great influence on the unconfined compressive strength of cement soil. The unconfined compressive strength of cement soil can be improved by adding cement into soft soil at first and then by adding water reducer after stuffing for 6 hours, especially in early stage, and the soft soil is interlaced with irregular structure after modified by naphthalene superplasticizer. Hydration products in lime soil and cement soil become richer and more evenly distributed.
【作者单位】：同济大学道路与交通工程教育部重点实验室;重庆大学山地城镇建设与新技术教育部重点实验室;
【分类号】：TU521.3

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