胶粉掺量对橡胶粉改性沥青性能的影响研究

2017-09-25 15:11:43汪昭宇��
中华建设科技 2017年8期

汪昭宇��

【摘要】为探究橡胶粉掺量对其改性沥青胶结料及混合料性能的影响,以指导实体工程应用,本文在试验室制备不同胶粉掺量的橡胶沥青及混合料,进行了相关试验研究,结果表明:(1)橡胶粉的掺入对沥青胶结料的性能指标有显著影响,其25℃针入度随胶粉掺量的增大而减小,软化点、延度及弹性恢复指标均随胶粉掺量的增大而增大;这4项指标的变化均与胶粉掺量的变化趋势呈线性相关,且相关系数较高;(2)21~24%胶粉掺量对软化点指标改善较好;18~24%胶粉掺量对延度和弹性恢复指标改善比较稳定,综合考虑,认为21~24%比较合适。(3)21%与24%胶粉掺量的60℃车辙动稳定度指标与真空饱水马歇尔残留稳定度指标无明显差异,但24%胶粉掺量的低温改善效果却优于21%胶粉掺量。

【关键词】胶粉掺量;橡胶沥青;沥青混合料;性能影响

Study on the properties influence of rubber powder content for rubber powder modified asphalt

Wang Zhao-yu

(China Merchants Chongqing Communications Research & Design InstituteChongqing400067)

【Abstract】In order to explore the properties influence of rubber powder content for modified asphalt binder and mixture, rubber asphalt and mixtures of different colloidal powder was prepared in the laboratory,and the relevant experimental was studied in this paper.The results shows:(1)The mixed rubber powder for asphalt cement has remarkable effect on the performance indexes of the 25 ℃ penetration decreases with increasing the powder content, softening point, ductility and elastic recovery index with the increases of the rubber powder content;The changes of these four indexes are linearly correlated with the variation trend of the amount of colloidal powder, and the correlation coefficient is high;(2)21 ~ 24% of the amount of rubber powder is better for softening point index;The improvement of extension and elastic recovery index is relatively stable of 21 ~ 24% of the amount of rubber powder; comprehensive consideration, think 21 ~ 24% is appropriate;(3)The dosage of 21% and 24% rubber powder 60 ℃ the rut dynamic stability index and vacuum filling water residue Marshall stability index has no obvious difference,however, the effect of the low temperature improvement of 24 percent of the powder was better than that of 21 percent.

【Key words】Rubber powder content;Rubber asphalt;Asphalt mixture;Influence on performances

1. 前言

(1)隨着社会经济的快速发展,高速公路的交通量显著增加,尤其是重载交通越来越多,此对高速公路沥青路面的质量和使用耐久性提出了更高的要求,因此,为了提高路面的使用耐久性,改性沥青技术被广泛应用,如SBS改性沥青、橡胶改性沥青等。不同于SBS改性沥青,橡胶改性沥青的改性作用主要表现在对石油沥青的增柔增韧方面,可显著改善沥青胶结料的弯曲变形和低温抗裂性能[1,2]。目前,橡胶粉改性沥青及其混合料多用在冬季低温地区和干刚性基层或刚性基层的应力吸收层等方面。

(2)橡胶粉改性沥青是将一定量的废旧轮胎胶粉掺入到石油沥青中,在一定的物理化学条件下混合形成橡胶沥青混合料,可见,在橡胶沥青制备的过程中,影响其性能的参数较多,比如胶粉掺量、搅拌时间以及反应温度等[3]。……

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