橡胶沥青老化机理及其再生性能研究

发布时间：2018-03-26 06:35

本文选题：橡胶沥青　切入点：高温湿热　出处：《广西大学》2015年硕士论文

【摘要】：目前国内外针对橡胶沥青以及改性橡胶沥青已经开展了许多研究。广西地处亚热带季风气候区,是全国最高积温省区之一,广西也是全国降水量最丰富的地区之一。本文主要研究的是在这种亚热带高温、多雨湿热环境下,橡胶沥青的老化规律、老化机理以及其再生性能。以70#和90#橡胶沥青作为研究对象,采用控制变量法分别改变老化时间和老化温度,测试老化前后橡胶沥青的针入度、软化点、延度和粘度,测试SHRP指标。分析结果表明,对各个性能指标进行线性回归分析后,粘度的相关系数最大,而且变化的规律较为稳定,故选择粘度作为建立老化动力学方程的参数。通过试验数据与公式推导,得到橡胶沥青的老化动力学方程。在室内模拟广西高温湿热多雨的气候环境下,橡胶沥青的老化情况。在组合环境条件下老化,通过比较分析,得出了以下结论：由于高温湿热和雨水的影响,相同老化时间下,橡胶沥青的老化程度更严重,由于湿热和压力作用,雨水会进一步渗入橡胶沥青路面内部,使橡胶沥青的老化不断的加剧。通过红外光谱仪对橡胶沥青进行老化机理分析,结果表明在广西高温湿热多雨气候环境下,随着老化的进行,羰基含量进一步增加,老化加剧。而有水加入反应时,亚砜基指数稍微有所降低,这是由于橡胶沥青分子中的硫酸基与水发生作用生成了氢键,而具有亲水性,降低了被氧化硫化物的浓度,从而影响了亚砜基指数。分别采用基质沥青和再生剂对老化后的橡胶沥青进行再生,试验结果表明,当掺入基质沥青的比例为80%的时或者再生剂掺量为9%时,再生橡胶沥青就能够恢复其大部分性能。再生橡胶沥青再次老化后,通过再生剂再生的橡胶沥青,由于其老化破坏的交联结构没有得到恢复,再次老化后的各项性能指标相比掺入基质沥青的再生橡胶沥青要稍差,但两种再生橡胶沥青都能达到使用要求
[Abstract]:At present, many researches have been carried out at home and abroad on rubber asphalt and modified rubber asphalt. Guangxi is located in the subtropical monsoon climate zone and is one of the highest accumulated temperature provinces in China. Guangxi is also one of the most abundant precipitation areas in China. This paper mainly studies the aging law of rubber asphalt in this subtropical high temperature, wet and humid environment. Taking 70# and 90# rubber asphalt as the research object, using the control variable method to change the aging time and aging temperature respectively, the penetration, softening point, ductility and viscosity of rubber asphalt before and after aging were tested. The SHRP index is tested. The results show that the correlation coefficient of viscosity is the largest and the law of variation is more stable after linear regression analysis of each performance index. Therefore, the viscosity is chosen as the parameter to establish the aging kinetic equation. Through the experimental data and formula derivation, the aging dynamic equation of rubber asphalt is obtained. In the indoor simulation of the high temperature, humid and rainy climate of Guangxi, the aging dynamic equation is obtained. Aging of rubber asphalt. Through comparison and analysis, the following conclusions are drawn: due to the influence of high temperature, humidity and Rain Water, the aging degree of rubber asphalt is more serious under the same aging time. Due to the effect of damp, heat and pressure, Rain Water will further penetrate into the interior of rubber asphalt pavement, which will make the aging of rubber asphalt become more and more serious. The aging mechanism of rubber asphalt is analyzed by infrared spectrometer. The results showed that the carbonyl content increased and the aging increased with aging in high temperature, humid and rainy climate of Guangxi, and the sulfoxide index decreased slightly with the addition of water. This is because the sulphate group in the rubber pitch molecules acts with water to form a hydrogen bond, which is hydrophilic and reduces the concentration of the sulfide oxide. Therefore, the sulfoxide group index is affected. The rubber asphalt after aging is regenerated by using matrix asphalt and regenerative agent respectively. The results show that when the proportion of matrix asphalt is 80% or the amount of regeneration agent is 9%, The recycled rubber asphalt is able to recover most of its properties. After the recycled rubber asphalt is aged again, the rubber asphalt regenerated by the regenerating agent has not been restored because of its aging damaged cross-linking structure. The performance indexes after re-aging are slightly worse than those of recycled rubber asphalt mixed with matrix asphalt, but both kinds of recycled rubber asphalt can meet the requirements of application.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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