滨海氯盐盐渍土加固工程特性  

Engineering Characteristic of Reinforcement Chlorine Saline Soil in Coastal

作　　者：张真怡[1] 罗阳楚君 裴向军[1] ZHANG Zhen-yi LUO Yang-chu-jun PEI Xiang-jun(College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《土木工程与管理学报》2017年第4期59-63,共5页Journal of Civil Engineering and Management

摘　　要：盐渍土广泛分布于我国东部沿海地区,在工程建设中常出现溶陷、盐胀及腐蚀性等病害,对工程建设造成了极大地危害。试验采用成都理工大学自主研制新型抗盐胀固化材料SD作为固化剂对人工配置氯盐盐渍土进行室内试验,研究固化剂对氯盐盐渍土工程特性的影响。试验表明,抗盐胀固化剂可有效提高氯盐盐渍土强度,降低盐渍土膨胀性,固化剂掺量为2.5%,5%的试样28 d抗压强度相较于纯水泥试样分别增加56.72%,95.52%,抗折强度分别增加48.11%,52.53%;添加了固化剂试样线膨胀量约为纯水泥加固试样的的0.2倍。该固化剂有效提高了工程质量,延长其使用寿命,大大提高了工程经济效益。抗盐胀固化剂主要是通过抑制盐渍土中的盐离子与铝酸钙的反应即抑制Friedel盐和钙矾石的生成来达到固化氯盐盐渍土的目的。Saline soil is widely distributed in the eastern coastal areas in China, and dissolving depression, expension salt and corrosive and other diseases which often appear in engineering construction, caused the harm greatly on construction engineering. Laboratory experiment of artificial preparation of chlorine saline soil was carried with resistance to salt expansion curing agent which independently developed by Chengdu University of Technology. The effects of the curing agent chlorine saline soil engineering properties is analyzed, and the curing agent for curing mechanism of chlorine saline soil is researched. The experiment shows, resistance to salt expansion curing agent can effectively improve the strength of chlorine saline soil, and lower dilatability of saline soil. Curing agent content is 2.5%, 5% of the sample of 28 d compressive strength than the pure cement specimens respectively increased by 56.72%, 95.52%, the flexural strength were increased by 48.11%, 52.53% ; Add the amount of curing agent sample linear expansion is about 0.2 times of pure cement sample. The curing agent effectively improves the engineering quality and prolong its service life, greatly improving the economic benefits of the project. Salt expansion curing agents by inhibiting the reaction of sait ions in saline soil and calcium aluminate, namely suppression the generation of Friedel and ettringite to achieve purposes of curing chlorine soil.

关 键 词：氯盐盐渍土 抗盐胀固化剂 工程特性 固化机理 

分 类 号：TU472.5[建筑科学—结构工程]