路堤填料的无机化学反应可行性研究
发布时间：2018-07-27 18:11
【摘要】：随着高速公路建设的不断发展,路堤填料改良问题越来越受到重视。常见的固化技术中,无机固化剂具有独特优势,但仍存在适用性有限、配比实验繁琐等问题。固化剂存在局限性根本在于迄今尚未形成系统的、实用的固化剂设计理论和方法。因此,开展对路堤填料的无机改性的机理研究有其重大意义。本文选取苏北地区常见的低液限粉土作为研究对象,对该土进行无机化学改性,结合物理化学表征、热力学计算和宏观力学试验对路堤填料的化学改性机理进行了系统研究,主要研究工作和成果如下：(1)通过分析苏北地区经历的沉积历史和沉积环境,分析该地区低液限粉土工程地质性质较差的原因,并结合室内基础土工试验以及XRD、BET等试验对该低液限粉土的基本物理性质、矿物成分及微观结构等进行研究,为粉土的无机化学改性做准备。(2)结合土的化学成分,利用化学反应数据库并结合前人的研究成果,选取能够与土中化学成分发生化学反应并能转化为胶结材料的化学物质作为固化剂；根据固体表面化学、化学热力学、表面自由能理论等基本原理估算固化剂的添加配比,确定试验方案。(3)跟踪不同养护时间的土的成分、浸出液成分及浸出液PH值等的变化情况。对各试验方案中所添加的改性剂组分与素土之间的化学反应速率、反应程度等化学动力学各方面进行综合分析,借此推测改性机理。(4)开展微观宏观试验,对路堤填料的无机改性结果进行研究,验证根据无机化学基本原理确定的试验方案及固化剂配比的有效性。具体内容包括：A颗粒粒径、级配分析。对比包括素土在内的11个不同试验方案的试样的颗粒粒径特征。通过分析各试验方案的各粒组的百分含量、级配曲线图以及最大最小粒径,证明了所选试剂的合理性。B矿物成分分析。采用X射线衍射(XRD)手段,对各组试样的矿物定性定量分析,根据Gibbs自由能原理,计算改性前后各试验方案的△G的变化情况；结合颗粒的粒径大小分析矿物成分与土的粒径之间的关系。C比表面积分析。采用BET比表面积测试手段,对各组试样的比表面积、孔径分布进行测试,根据比表面积的变化情况,分析各试验方案的表面自由能的变化趋势与矿物成分变化之间的关系。D加州承载比(CBR)试验。通过CBR试验模拟在受水浸泡的最不利的情况下土样的强度,分析各组试样的水稳性,结合分析了矿物成分、颗粒级配、比表面积对土的CBR值的影响；并计算了11组样品的吉布斯自由能,通过对比改性前后的自由能的改变,探讨了体系的热力学性质与土的宏观力学特性之间的关系。本文将无机化学中的能量最小原理、Gibbs自由能原理以及固体表面化学的相关原理,应用到路基填料的无机化学改性技术中,利用土的表面积计算得到了添加剂的配比,并通过微观、宏观试验相结合,验证了试验配方及配比的合理性,验证了无机化学反应的基本原理应用到路堤填料改良中的可行性。
[Abstract]:With the continuous development of highway construction, the improvement of embankment packing has been paid more and more attention. In the common curing technology, the inorganic curing agent has unique advantages, but there are still limited applicability and tedious experiment. The limitation of the curing agent is that the curing agent has not yet formed a systematic, practical curing agent design theory and a practical design theory. Therefore, it is of great significance to carry out the study on the mechanism of inorganic modification of embankment fillers. In this paper, the common low liquid limit silt in North Jiangsu is selected as the research object. The inorganic chemical modification, physical and chemical characterization, thermodynamic calculation and macro mechanical test of the soil are carried out to the chemical modification mechanism of embankment fillers. The main research work and achievements are as follows: (1) by analyzing the sedimentary history and sedimentary environment of the northern Jiangsu Province, the reasons for the poor engineering geological properties of the low liquid limit silt in this area are analyzed, and the basic physical properties, mineral composition and microstructure of the low liquid limit silt, including the laboratory foundation soil test and the XRD and BET tests, are combined. Study, prepare for the inorganic chemical modification of silt. (2) combining the chemical composition of soil, using the chemical reaction database and combining the previous research results, the chemical substance which can react with the chemical composition of the soil and can be converted into cemented material is selected as the curing agent; according to the surface chemistry, chemical thermodynamics, surface of the surface The basic principles of free energy theory are used to estimate the adding ratio of the curing agent and determine the test scheme. (3) the changes in the composition of soil, the composition of the leaching solution and the pH value of the leaching solution, and the chemical reaction rate and the degree of reaction between the modifier and the plain soil added in the various test schemes. Comprehensive analysis is carried out to conjecture the modification mechanism. (4) carry out micro macro test, study the inorganic modification results of embankment filling, verify the effectiveness of the test scheme and the ratio of the curing agent determined according to the basic inorganic chemistry principle. The specific content includes: the particle size of A particles, the gradation analysis, and the comparison of 11 different tests including the plain soil. By analyzing the content of the particle size, the gradation curve and the maximum minimum particle size of each test scheme, the mineral composition analysis of the selected reagents is proved by the analysis of the mineral composition of the selected reagents. Using the X ray diffraction (XRD) method, the qualitative and quantitative analysis of the minerals of each sample is made, and the.B is calculated and modified according to the principle of Gibbs free energy. The variation of delta G in each test program before and after sex, and the analysis of the relation between the mineral composition and the particle size of the soil with the particle size of the particles is analyzed. The specific surface area and pore size distribution of each sample are tested by means of BET specific surface area test, and the surface of each test plan is analyzed according to the change of specific surface area. The relationship between the change trend of free energy and mineral composition.D California bearing ratio (CBR) test. Through the CBR test, the strength of soil samples was simulated under the most unfavorable condition of water immersion, the water stability of each sample was analyzed, and the influence of mineral composition, particle size distribution and specific surface area on the CBR value of soil was analyzed, and 11 groups of samples were calculated. The relationship between the thermodynamic properties of the system and the macroscopic mechanical properties of soil is discussed by comparing the changes of the free energy before and after the modification of the Gibbs free energy. In this paper, the principle of energy minimum, the principle of Gibbs free energy and the related principles of solid surface chemistry in the inorganic chemistry are applied to the inorganic chemical modification technology of the subgrade packing. In addition, the ratio of the additives is obtained by the calculation of the surface area of the soil, and the rationality of the formula and proportion is verified through the combination of microcosmic and macroscopic tests. The feasibility of the basic principle of inorganic chemical reaction to the improvement of embankment fillers is verified.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414;U416.12
本文编号：2148722
[Abstract]:With the continuous development of highway construction, the improvement of embankment packing has been paid more and more attention. In the common curing technology, the inorganic curing agent has unique advantages, but there are still limited applicability and tedious experiment. The limitation of the curing agent is that the curing agent has not yet formed a systematic, practical curing agent design theory and a practical design theory. Therefore, it is of great significance to carry out the study on the mechanism of inorganic modification of embankment fillers. In this paper, the common low liquid limit silt in North Jiangsu is selected as the research object. The inorganic chemical modification, physical and chemical characterization, thermodynamic calculation and macro mechanical test of the soil are carried out to the chemical modification mechanism of embankment fillers. The main research work and achievements are as follows: (1) by analyzing the sedimentary history and sedimentary environment of the northern Jiangsu Province, the reasons for the poor engineering geological properties of the low liquid limit silt in this area are analyzed, and the basic physical properties, mineral composition and microstructure of the low liquid limit silt, including the laboratory foundation soil test and the XRD and BET tests, are combined. Study, prepare for the inorganic chemical modification of silt. (2) combining the chemical composition of soil, using the chemical reaction database and combining the previous research results, the chemical substance which can react with the chemical composition of the soil and can be converted into cemented material is selected as the curing agent; according to the surface chemistry, chemical thermodynamics, surface of the surface The basic principles of free energy theory are used to estimate the adding ratio of the curing agent and determine the test scheme. (3) the changes in the composition of soil, the composition of the leaching solution and the pH value of the leaching solution, and the chemical reaction rate and the degree of reaction between the modifier and the plain soil added in the various test schemes. Comprehensive analysis is carried out to conjecture the modification mechanism. (4) carry out micro macro test, study the inorganic modification results of embankment filling, verify the effectiveness of the test scheme and the ratio of the curing agent determined according to the basic inorganic chemistry principle. The specific content includes: the particle size of A particles, the gradation analysis, and the comparison of 11 different tests including the plain soil. By analyzing the content of the particle size, the gradation curve and the maximum minimum particle size of each test scheme, the mineral composition analysis of the selected reagents is proved by the analysis of the mineral composition of the selected reagents. Using the X ray diffraction (XRD) method, the qualitative and quantitative analysis of the minerals of each sample is made, and the.B is calculated and modified according to the principle of Gibbs free energy. The variation of delta G in each test program before and after sex, and the analysis of the relation between the mineral composition and the particle size of the soil with the particle size of the particles is analyzed. The specific surface area and pore size distribution of each sample are tested by means of BET specific surface area test, and the surface of each test plan is analyzed according to the change of specific surface area. The relationship between the change trend of free energy and mineral composition.D California bearing ratio (CBR) test. Through the CBR test, the strength of soil samples was simulated under the most unfavorable condition of water immersion, the water stability of each sample was analyzed, and the influence of mineral composition, particle size distribution and specific surface area on the CBR value of soil was analyzed, and 11 groups of samples were calculated. The relationship between the thermodynamic properties of the system and the macroscopic mechanical properties of soil is discussed by comparing the changes of the free energy before and after the modification of the Gibbs free energy. In this paper, the principle of energy minimum, the principle of Gibbs free energy and the related principles of solid surface chemistry in the inorganic chemistry are applied to the inorganic chemical modification technology of the subgrade packing. In addition, the ratio of the additives is obtained by the calculation of the surface area of the soil, and the rationality of the formula and proportion is verified through the combination of microcosmic and macroscopic tests. The feasibility of the basic principle of inorganic chemical reaction to the improvement of embankment fillers is verified.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414;U416.12
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