高含水率软土固化剂材料的性能研究
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摘要
以上海高含水率的淤泥质粉质黏土为研究对象,通过试验方法分析不同固化剂的固化性能。试验中采用石灰、石膏、矿渣微粉、超细水泥等部分替代水泥以组成不同配比的固化剂,以固化软土的UCS为主要指标,研究不同配比固化剂对高含水率软土早期固化效果和破坏特点。研究结果表明:(1)当高含水率软土中固化剂总掺入比为20%时,超细水泥对固化土的抗压强度性能影响最大;(2)随着超细水泥掺量的增加,固化软土抗压强度逐渐增大,但对于含水率50%的固化土由于二次水化反应的不充分抗压强度增长缓慢,超细水泥掺量存在一定的阈值。
The experimental study is carried out to investigate the mechanical behavior of soft soil with high water content cured by different curing agents. The different portion of lime, gypsum, slag powder and ultra-fine cement are used to partly replace the cement in curing agent to form the different curing agents. Then the unconfined compression test is adopted to obtain the unconfined compressive strength(UCS) and failure pattern of the treated soft soil cured by different curing agents at early age. The results show that:(1) when the ratio of curing agent to solid particle of soft soil is 20%, the addition of ultra-fine cement(UFC) in curing agent performed the greatest influence on the UCS of the cured soft soil;(2) with the increase of the content of UFC, the UCS of cured soft soil increases. However, for the soft soil with 50% water content, the UCS of the treated soft soil cured by the UFC agent enhanced slowly due to the insufficient secondary hydration reaction, and hence, there is a certain threshold for the amount of UFC added in the curing agent.
The experimental study is carried out to investigate the mechanical behavior of soft soil with high water content cured by different curing agents. The different portion of lime, gypsum, slag powder and ultra-fine cement are used to partly replace the cement in curing agent to form the different curing agents. Then the unconfined compression test is adopted to obtain the unconfined compressive strength(UCS) and failure pattern of the treated soft soil cured by different curing agents at early age. The results show that:(1) when the ratio of curing agent to solid particle of soft soil is 20%, the addition of ultra-fine cement(UFC) in curing agent performed the greatest influence on the UCS of the cured soft soil;(2) with the increase of the content of UFC, the UCS of cured soft soil increases. However, for the soft soil with 50% water content, the UCS of the treated soft soil cured by the UFC agent enhanced slowly due to the insufficient secondary hydration reaction, and hence, there is a certain threshold for the amount of UFC added in the curing agent.
引文
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[14]黄雨,周子舟,柏炯,等.石膏添加剂对水泥土搅拌法加固软土地基效果影响的微观试验分析[J].岩土工程学报,2010,32(8):1 179-1 183.
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[16]Shi C J,Krivenko P V,Roy D.Alkali-activated cements and concretes[M].London:Taylor&Francis,2006.
[2]任葳葳.高分子材料改性淤泥质土及其机理研究[D].重庆:重庆大学,2015.
[3]李贞.生物酵素酶土壤固化技术在道路工程中的试验研究[D].沈阳:沈阳大学,2017.
[4]邓伟军.EN-1离子土壤固化剂改性膨胀土试验研究[J].中外公路,2015,35(2):248-25.
[5]杨林,刘雨彤,宋玉鑫.外加剂改性水泥石灰土力学及收缩特性试验研究[J].中外公路,2018,38(1):288-293.
[6]米吉福,汪浩,刘晶冰,等.土壤固化剂的研究及应用进展[J].材料导报,2017,31(z1):388-391,401.
[7]Aly Ahmed.Compressive strength and microstructure of soft clay soil stabilized with recycled basanite[J].Applied Clay Science,2015(104):27-35.
[8]Phetchuay C,Horpibulsuk S,Arulrajah A,et al.Development in soft marine clay stabilized by fly ash and calcium carbide residue based geopolymer[J].Applied Clay Science,2016(127/128):134-142.
[9]邢维忠.GGBS固化合肥湖积软土的力学特性试验研究[D].合肥:安徽建筑大学,2015.
[10]易耀林,卿学文,庄焱,等.粒化高炉矿渣微粉在软土固化中的应用及其加固机理[J].岩土工程学报,2013(z2):829-833.
[11]中华人民共和国国家标准.SL 237-1999土工试验规程[S].北京:中国水利水电出版社,1999.
[12]中华人民共和国国家标准.GB/T50123-1999土工试验方法标[S].北京:中国计划出版社,1999.
[13]黄新,宁建国,郭晔,等.水泥含量对固化土结构形成的影响研究[J].岩土工程学报,2006,28(4):436-441.
[14]黄雨,周子舟,柏炯,等.石膏添加剂对水泥土搅拌法加固软土地基效果影响的微观试验分析[J].岩土工程学报,2010,32(8):1 179-1 183.
[15]李战国,赵永生,黄新,等.工业废渣制备软土地基固化剂设计方法探讨[J].北京航空航天大学学报,2009,35(4):497-500.
[16]Shi C J,Krivenko P V,Roy D.Alkali-activated cements and concretes[M].London:Taylor&Francis,2006.