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时间:2019-05-13
《含铝固化剂固化软土的试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第26卷第1期岩石力学与工程学报Vol.26No.12007年1月ChineseJournalofRockMechanicsandEngineeringJan.,2007含铝固化剂固化软土的试验研究黄新,许晟,宁建国(北京航空航天大学土木工程系,北京100083)摘要:用普通硅酸盐水泥、石膏和一种含铝膨胀组分构成的复合固化剂(PC+G+Al固化剂),选取2种有代表性的试样,进行软土固化试验研究,并与单纯使用水泥(PC)和水泥–石膏(PC+G)固化剂加固软土的效果进行比较分析。研究结果表明:对2种试样,PC+G+Al固化剂加固效果优于
2、其他2种固化剂;PC+G固化剂只对孔隙比大、含水率高的试样加固效果优于PC固化剂的加固效果。PC+G+Al和PC+G固化剂的水化物中都产生钙矾石,利用钙矾石生成的固相膨胀作用填充孔隙,而钙矾石的生成在固化土中是否产生增强效果,主要取决于钙矾石与水化硅酸钙凝胶生成过程的协调性。关键词:土力学;固化土;水化硅酸钙凝胶;协调性;强度中图分类号:TU43;TU528.042文献标识码:A文章编号:1000–6915(2007)01–0156–06EXPERIMENTALRESEARCHONSTABILIZEDSOFTSOILSBYALUMI
3、NABEARINGMODIFIERHUANGXin,XUSheng,NINGJianguo(DepartmentofCivilEngineering,BeihangUniversity,Beijing100083,China)Abstract:TheexperimentalinvestigationwascarriedoutwiththepurposeofmakingacontrastofstrengtheffectsoftwoclaysoilspeciesstabilizedbyPortlandcement(PC),portlan
4、dcement-gypsum(PC+G)andcompoundmodifier(PC+G+Al),whichconsistofPortlandcement,gypsumandaluminaexpansiveagent.Theresultillustratesthatthestrengtheffectofstabilizedsoftsoilsdifferstrikinglyduetotheirrespectiveaddition.PC+G+Almodifierinbothstabilizedsoilsamplesproducesmor
5、esignificantimprovementinstrengthdevelopmentthantheothertwomodifiers.ThePC+Gmodifierproducespositiveeffectonstrength,comparedwithPCmodifier,onlyinonestabilizedsoilsample,whichisinhighwatercontentratioandporosityandcontainsactivesoilmineralogicalcomposition.BothPC+G+Ala
6、ndPC+Gmodifiers,inbothsoftsoilsamples,formettringiteintheirhydrates.Theformationofettringiteprovidespronouncedsolid-phaseexpansiontofilluptheporosityofsoftsoils.Whethertheformationofettringiteenhancesthestrengthofstabilizedsoildependsontheconcordanceinformationofettrin
7、giteandcalciumsilicatehydrate(CSH)gel.ThestrengthofthestabilizedsoilsamplesincreasesmarkedlywhentheformationofettringiteispriortotheformationofCSHgelstructure,whichbenefitstheporefillingaswellasmitigatestheexpansiondamagetotheCSHgelstructure.Keywords:soilmechanics;stab
8、ilizedsoil;calciumsilicatehydrate(CSH);concordance;strength收稿日期:2005–12–20;修回日期:2006–02–08基金项目:国家自然科学基金资助项目(50278007)
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