固化土道路基层路用性能试验研究

发布时间：2018-02-26 04:18

本文关键词： 土壤固化剂固化机理固化土基层强度影响因素耐久性指标　出处：《沈阳建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着社会的不断发展,我国对道路建设的投入日益加大,砂、石等传统筑路材料的开采已严重破坏环境,造成大量浪费,工程建设的快速增长使整个社会付出了太多的代价。节约资源、保护环境已是世界各国共同关心的重大课题。土壤固化剂这一新型环保材料具有良好的经济性、工程性质稳定,必将给道路建设带来一场革命。本文开篇阐明了研究固化土路面基层材料具有的经济效益和可持续发展意义,土壤固化剂技术的发展起源,目前国内外的研究成果和研究现状。国内外科研人员对固化土路面基层的研究现状和近年来国内的部分试验路应用情况。提出固化土基层的技术指标,从经济性和综合性两方面描述了固化土基层现阶段发展面临的困难。固化土的分类形式多种多样,本文从高聚物类土壤固化剂、表面活性剂类土壤固化剂、生物酶类土壤固化剂和粉状土壤固化剂4个方面深入分析了它们的固化机理,并将之与传统土壤加固材料作对比。本文依托辽宁省内的土质分布情况,选取有代表性的3种土壤并搭配5种分别来自3个厂家的土壤固化剂,首先进行原材料试验,包括筛分、测定液塑限值等,给土样定名。通过击实试验研究固化土基层材料含水率干密度的影响因素,并得出3种土样和3种混合土的最佳含水率和最大干密度。通过7d无侧限抗压强度试验作为配合比设计的依据,研究不同固化剂与结合料对不同土质的强度影响差异。选取配合比方案后,对不同龄期试件的无侧限抗压强度、劈裂强度、抗压回弹模量进行试验研究,探究固化剂与结合料的综合作用是怎样影响这些强度指标的,并对制件过程中压实度与延迟时间对材料强度的影响也进行了分析。从固化土基层的耐久性方面,对水稳定性、干湿循环、吸水性、渗透系数、冻融循环进行试验分析,总结出固化剂对干湿循环性、抗渗性、抗冻融循环性有较好的改良作用,而对水稳定性和吸水性没有明显的作用效果。
[Abstract]:With the development of society, the investment in road construction in our country is increasing day by day. The exploitation of traditional road building materials, such as sand and stone, has seriously damaged the environment and caused a lot of waste. The rapid growth of engineering construction has made the whole society pay too much price. Saving resources and protecting the environment has become a major issue of common concern in the world. Soil curing agent, a new type of environmental protection material, has good economy and stable engineering properties. It will surely bring a revolution to the road construction. In the beginning of this paper, the economic benefit and sustainable development significance of the study of the solidified soil pavement base material and the origin of the development of the soil curing agent technology are expounded. The present research results and research status at home and abroad, the research status of solidified soil pavement base at home and abroad and the application of some domestic test roads in recent years, the technical indexes of solidified soil base are put forward. In this paper, the difficulties in the development of solidified soil base are described in terms of economy and comprehensiveness. The classification of solidified soil is varied. In this paper, polymer soil curing agent and surfactant soil curing agent are introduced. In this paper, four aspects of soil curing agents such as biological enzymes and powdery soil curing agents are analyzed in depth, and compared with traditional soil strengthening materials. The distribution of soil quality in Liaoning Province is relied on in this paper. Three kinds of soils were selected and five kinds of soil curing agents from three factories were used to test the raw materials, including screening, measuring the limit value of liquid and plastic, and so on. Name the soil sample. Through compaction test, study the influencing factors of moisture content and dry density of solidified soil base material, The optimum moisture content and maximum dry density of three soil samples and three mixed soils were obtained. The effects of different curing agents and binders on the strength of different soils were studied. This paper explores how the comprehensive action of curing agent and binder affects these strength indexes, and analyzes the influence of compaction degree and delay time on the strength of the material in the process of making parts. The dry and wet cycle, water absorption, permeability coefficient and freeze-thaw cycle were tested and analyzed. It was concluded that the curing agent had a better effect on dry-wet circulation, impermeability and anti-freeze-thaw cycle, but had no obvious effect on water stability and water absorption.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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