摘要
本研究探讨了聚羧酸(PCE)、三聚氰胺(SM)和萘系(NF)减水剂掺量对镁渣-粉煤灰基流态固化土流变性及抗压强度的影响。通过流动度测试、流变性分析及抗压强度评估,探讨了减水剂类型和掺量对流态固化土流动性、屈服应力、塑性粘度、表观粘度、触变性及抗压强度的作用机制。结果表明,三种减水剂均能改善流态固化土的流动度和流变性,SM和NF减水剂提升效果显著,PCE减水剂提升效果相对较弱。当减水剂掺量为1%(质量分数)时,掺SM和NF减水剂的流态固化土的流动度分别提高了25%和37%。减水剂的掺入显著降低了浆体的屈服应力、塑性粘度及触变性,尤其是NF和SM减水剂具有较强的颗粒分散作用,能有效减少颗粒间的聚集和絮凝。流态固化土流动度与屈服应力呈线性负相关,减小屈服应力是提高流动性的关键。适量掺入SM减水剂可以提高流态固化土全龄期抗压强度,增强材料均匀性和致密性,而NF减水剂则会对抗压强度产生不利影响。
In this study,the effects of polycarboxylic acid(PCE)content,melamine(SM)content and naphthalene(NF)water-reducing agent content on the rheological properties and compressive strength of magnesium slag-fly ash based flowable solidified soil were discussed.Through fluidity test,rheological properties analysis and compressive strength evaluation,the mechanism of action of the type and content of water-reducing agent on the fluidity,yield stress,plastic viscosity,apparent viscosity,thixotropy and compressive strength of flowable solidified soil was discussed.The results show that the three types of water-reducing agents can improve the fluidity and rheological properties of flowable solidified soil.The effects of SM and NF water-reducing agents are significant,and the effect of PCE water-reducing agent is relatively weak.When the water-reducing agent content is 1%(mass fraction),the fluidity of flowable solidified soil with SM and NF water-reducing agent increases by 25% and 37%,respectively.The addition of water-reducing agent significantly reduces the yield stress,plastic viscosity and thixotropy of paste,especially NF and SM water-reducing agent,which has a strong particle dispersion effect and can effectively reduce the aggregation and flocculation between particles.The fluidity of flowable solidified soil is negatively correlated with yield stress,and reducing yield stress is the key to improve fluidity.Appropriate addition of SM water-reducing agent can improve the full-age compressive strength of flowable solidified soil,enhance the uniformity and compactness of material,while NF water-reducing agent will have an adverse effect on the compressive strength.
作者
赫明胜
秦庆金
高慧
曲春雨
秦永
房奎圳
郝建帅
HAO Mingsheng;QIN Qingjin;GAO Hui;QU Chunyu;QIN Yong;FANG Kuizhen;HAO Jianshuai(China Railway 14th Bureau Group Corporation Limited,Jinan 250014,China;School of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《硅酸盐通报》
北大核心
2025年第7期2710-2719,共10页
Bulletin of the Chinese Ceramic Society
基金
国家资助博士后研究人员计划C类(GZC20231354)
国家自然科学基金(52178225)。
关键词
减水剂
流态固化土
镁渣
流变性
强度
water-reducing agent
flowable solidified soil
magnesium slag
rheological property
strength
