乳化沥青及混合料水中浸出性能研究

发布时间：2018-03-31 10:28

本文选题：乳化沥青　切入点：浸出性能　出处：《长安大学》2014年硕士论文

【摘要】：为研究乳化沥青及混合料水中浸出性能，利用红外光谱（IR）分析、比色分析、滴定分析、重量分析、交流阻抗技术等研究乳化沥青浸出性能，同时分别以浸泡液水样化学耗氧量（COD）值、固体悬浮物颗粒（SS）值、总硬度值、乳化剂含量值和交流阻抗(EIS)图谱作为乳化沥青水中浸出和抗渗性能性能评价指标，结合IR图谱判定乳化沥青浸出后材料构成变化，以重量分析技术测定乳化沥青浸出速率并建立乳化沥青浸出动力学方程。另外，进行了阳离子乳化沥青、阴离子乳化沥青和阳离子乳化沥青冷再生混合料在酸性水体和碱性水体中进行浸泡实验，通过COD、SS、EIS、IR等测试手段对浸泡液和浸泡后乳化沥青进行分析研究，研究结果表明： 1）SS值可用于评价浸出悬浮沥青组分量，滤前COD值可用于评价浸出有机组分总量，滤后COD值可用于评价浸出可溶性有机组分量，而乳化剂含量试验可用于评价浸出乳化剂量；酸性水环境会加剧阳离子乳化沥青的组分浸出特性，，碱性环境会加剧阴离子乳化沥青的组分浸出特性，阴离子乳化沥青耐水侵蚀性较差，阳离子乳化沥青耐水侵蚀性能相对较好； 2）通过EIS测试结果可将乳化沥青试件在酸性水体的浸泡过程分为三个阶段，第一阶段为浸泡初期，浸泡时间为0h-36h；第二阶段为浸泡中期，浸泡时间为39h-78h；第三阶段为浸泡后期，浸泡时间为78h后；浸泡初期时水溶液通过沥青膜中微通道向沥青膜内部扩散，浸出中期时水溶已扩散至界面处，当浸泡进入浸泡后期后，沥青膜开始大面积起泡、肿胀，并剥离金属电极表面，已基本失去粘附性； 3）结合浸出动力学分析将乳化沥青试件浸出过程分为三阶段，通过动力学分析第一阶段浸出速率函数可用线性函数模拟，其方程为vI16.980.33t；第二阶段浸出速率函数同样可用线性函数模拟为vII8.950.11t；第三阶段浸出速率函数用二次多项式函数模拟较为准确，其方程为vIII209.345.94t0.04t2； 4）通过IR分析表明，阳离子乳化沥青浸出前后组分组成并未变化，但组分比例却有一定改变；阳离子乳化沥青三大指标试验结果表明阳离子乳化沥青浸出前后针入度、延度和软化点都有所变化，其中针入度和延度随浸泡时间的延长而呈减小变化，软化点则随浸泡时间的延长而呈增加变化趋势；乳化沥青冷再生混合料劈裂强度、低温弯曲及高温车辙试验结果表明浸泡对乳化沥青冷再生试件有一定影响，随浸泡时间的延长混合料的劈裂强度、低温性能和高温性能都会有所降低。
[Abstract]:In order to study the leaching performance of emulsified asphalt and its mixture in water, the leaching performance of emulsified asphalt was studied by IR, colorimetry, titration, gravimetric analysis and AC impedance technique. At the same time, the chemical oxygen consumption (COD), solid suspended particle (SS), total hardness, emulsifier content and AC impedance EISs were used as indicators to evaluate the leaching and impermeability of emulsified asphalt. The composition of emulsified asphalt was determined by IR spectra, the leaching rate of emulsified asphalt was determined by gravimetric analysis and the kinetic equation of emulsified asphalt leaching was established. In addition, cationic emulsified asphalt was carried out. The cold recycled mixture of anionic emulsified asphalt and cationic emulsified asphalt was immersed in acidic water and alkaline water. The soaking solution and emulsified asphalt after soaking were analyzed by means of CODX SSEIS-IR. The results showed that:. The 1)SS value can be used to evaluate the components of suspended asphalt, the COD value before filtration can be used to evaluate the total amount of leaching organic components, the COD value after filtration can be used to evaluate the soluble unit components of leaching, and the emulsifier content test can be used to evaluate the amount of emulsifier. The acidic water environment will aggravate the component leaching characteristics of cationic emulsified asphalt, the alkaline environment will aggravate the component leaching characteristics of anionic emulsified asphalt, and the water erosion resistance of anionic emulsified asphalt will be poor. The water erosion resistance of cationic emulsified asphalt is relatively good. 2) the soaking process of emulsified asphalt in acidic water can be divided into three stages by EIS test, the first stage is the initial stage of soaking, the time of soaking is 0h-36h, the second stage is the middle period of soaking, the soaking time is 39h-78h, the third stage is the later stage of soaking. After the immersion time was 78 h, the aqueous solution diffused through the microchannel in the asphalt film at the beginning of immersion, and the water solution had diffused to the interface in the middle stage of leaching. When the soaking was in the late stage of immersion, the asphalt membrane began to bubble in a large area and became swollen. The surface of the metal electrode has lost its adhesion. 3) the leaching process of emulsified asphalt samples is divided into three stages, and the leaching rate function of the first stage can be simulated by linear function. The equation is vI16.980.33t, the second stage leaching rate function can also be simulated as vII8.950.11t, the third stage leaching rate function is simulated by quadratic polynomial function, its equation is vIII209.345.94t0.04t2. 4) IR analysis shows that the composition of cationic emulsified asphalt has not changed before and after leaching, but the proportion of component has changed to a certain extent, and the results of three indexes of cationic emulsified asphalt show that the penetration of cationic emulsified asphalt before and after leaching, The ductility and softening point have some changes, in which the penetration and ductility decrease with the prolongation of soaking time, and the softening point increases with the prolongation of soaking time. The results of low temperature bending and high temperature rutting test show that soaking has a certain influence on the cold regenerated samples of emulsified asphalt. With the prolonging of immersion time, the splitting strength of the mixture will be decreased, and the low temperature and high temperature properties will be decreased.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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