大连理工大学学报
大連理工大學學報
대련리공대학학보
JOURNAL OF DALIAN UNIVERSITY OF TECHNOLOGY
2014年
6期
604-611
,共8页
赵春吉%赵红华%常艳%龚壁卫
趙春吉%趙紅華%常豔%龔壁衛
조춘길%조홍화%상염%공벽위
强膨胀土%水泥改性%自由膨胀率%一维无荷膨胀率%XRD%SEM%阳离子交换量
彊膨脹土%水泥改性%自由膨脹率%一維無荷膨脹率%XRD%SEM%暘離子交換量
강팽창토%수니개성%자유팽창솔%일유무하팽창솔%XRD%SEM%양리자교환량
highly expansive soil%cement treatment%free swelling ratio%one-dimensional non-load swelling ratio%XRD%SEM%cation exchange capacity
膨胀土是一种特殊的黏性土，具有遇水膨胀、崩解、软化，失水收缩、干裂、硬化等工程特性，膨胀土掺入水泥后其工程特性会发生改良。选取南水北调工程中河北邯郸地区的强膨胀土，在较长的养护龄期内，进行了水泥改性的试验研究。主要进行了基本物理性质试验、自由膨胀率试验、矿物分析试验、XRD 和 SEM 显微结构试验和阳离子交换量试验，从不同角度说明了不同龄期下水泥改性强膨胀土的物理化学特性、矿物组成和微观结构的变化，分析了水泥改性膨胀土的机理。发现阳离子交换量不能作为判断水泥改性后膨胀土膨胀性能的有效指标，为膨胀土现场水泥改性的设计施工提供了科学的、有价值的依据。
膨脹土是一種特殊的黏性土，具有遇水膨脹、崩解、軟化，失水收縮、榦裂、硬化等工程特性，膨脹土摻入水泥後其工程特性會髮生改良。選取南水北調工程中河北邯鄲地區的彊膨脹土，在較長的養護齡期內，進行瞭水泥改性的試驗研究。主要進行瞭基本物理性質試驗、自由膨脹率試驗、礦物分析試驗、XRD 和 SEM 顯微結構試驗和暘離子交換量試驗，從不同角度說明瞭不同齡期下水泥改性彊膨脹土的物理化學特性、礦物組成和微觀結構的變化，分析瞭水泥改性膨脹土的機理。髮現暘離子交換量不能作為判斷水泥改性後膨脹土膨脹性能的有效指標，為膨脹土現場水泥改性的設計施工提供瞭科學的、有價值的依據。
팽창토시일충특수적점성토，구유우수팽창、붕해、연화，실수수축、간렬、경화등공정특성，팽창토참입수니후기공정특성회발생개량。선취남수북조공정중하북함단지구적강팽창토，재교장적양호령기내，진행료수니개성적시험연구。주요진행료기본물이성질시험、자유팽창솔시험、광물분석시험、XRD 화 SEM 현미결구시험화양리자교환량시험，종불동각도설명료불동령기하수니개성강팽창토적물이화학특성、광물조성화미관결구적변화，분석료수니개성팽창토적궤리。발현양리자교환량불능작위판단수니개성후팽창토팽창성능적유효지표，위팽창토현장수니개성적설계시공제공료과학적、유개치적의거。
The expansive soil is a special type of clay with the engineering properties of swelling, disintegrating and softening when absorbing water and shrinkaging,desiccating and hardening when losing water.The engineering properties of expansive soil can be improved when treated with cement. The highly expansive soil in South-to-North Water Diversion Project was selected from Handan region,Hebei Province.A series of tests on the cement-treated Handan clay were carried out,mainly including the basic physical-chemical properties test,free swelling ratio test,mineralogy analysis and microstructure test by XRD,SEM test and cation exchange capacity test at different curing time over a long curing time.From different aspects,the variations of physical-chemical properties,mineralogy composite and microstructure were analyzed,and the mechanisms of cement treatment on highly expansive soil were discussed.Experimental results show that it is not reasonable to use cation exchange capacity to evaluate the swelling potential of cement-treated expansive soil.These results provide a scientific and valuable basis for design and construction of cement treatment on highly expansive soil.
