浇注式沥青混合料施工流动性研究
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摘要
流动性与高温稳定性的平衡是浇注式沥青混合料施工质量控制的关键.通过材料配合比试验和Cooker搅拌试验,对施工阶段流动性的影响因素、变化规律进行研究,解释流动性变化机理并提出了改善方案.研究表明,流动性响应敏感性排序为:油石比、矿粉用量、3～5 mm碎石用量,调整3～5 mm碎石用量可同时改善流动性和综合路用性能;调整油石较调整矿粉用量对综合路用性能的损害更小.Cooker搅拌4h内流动性略有改善,而更长时间的Cooker搅拌使流动性趋于两种截然相反的变化可能;轻质组分、小分子生成有利于流动,挥发则阻碍流动,流动性变化方向取决于组分挥发速度;初始流动性较好的混合料因挥发更慢而趋于流动性改善.应采取增加Cooker装载数量、降低搅拌转速等措施,限制组分挥发.
The balance between fluidity and high temperature stability is the key to construction quality control of gussasphalt. Through the material mix ratio test and Cooker mixing test, the influence factors and change rules of fluidity in construction stage were studied. The change mechanism of fluidity was explained and the improvement measures were put forward. The rwsearch shows that the order of sensitivity of fluidity response is as follows: asphalt content, amount of mineral powder and amount of 3-5 mm crushed stone. Adjusting the dosage of 3-5 mm crushed stone could simultaneously improve fluidity and comprehensive performance. Cooker stirring improves fluidity slightly within 4 hours, while longer time of Cooker stirring makes fluidity tend to two completely opposite changes. The formation of light components and small molecules is conducive to flow, while volatilization hinders flow, and the change direction of fluidity depends on the volatilization speed of components. The mixture with better initial fluidity tends to improve fluidity due to slower volatilization. Measures such as increasing Cooker loading quantity and reducing stirring speed should be taken to limit volatilization of components.
The balance between fluidity and high temperature stability is the key to construction quality control of gussasphalt. Through the material mix ratio test and Cooker mixing test, the influence factors and change rules of fluidity in construction stage were studied. The change mechanism of fluidity was explained and the improvement measures were put forward. The rwsearch shows that the order of sensitivity of fluidity response is as follows: asphalt content, amount of mineral powder and amount of 3-5 mm crushed stone. Adjusting the dosage of 3-5 mm crushed stone could simultaneously improve fluidity and comprehensive performance. Cooker stirring improves fluidity slightly within 4 hours, while longer time of Cooker stirring makes fluidity tend to two completely opposite changes. The formation of light components and small molecules is conducive to flow, while volatilization hinders flow, and the change direction of fluidity depends on the volatilization speed of components. The mixture with better initial fluidity tends to improve fluidity due to slower volatilization. Measures such as increasing Cooker loading quantity and reducing stirring speed should be taken to limit volatilization of components.
引文
[1] 张晓强.再生沥青混合料中旧沥青再生程度影响因素研究[J].武汉理工大学学报(交通科学与工程版),2018,42(4):667-670+675.
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[13] 李璐,郝增恒,盛兴跃.基于红外光谱的浇注式沥青超热低氧老化机理[J].公路交通科技,2016,33(11):20-25.
[2] 王民,张锋,李玉龙,等.Sasobit改性剂对浇注式沥青混合料性能的影响[J].中外公路,2007,27(4):285-288.
[3] 张肖宁,陈剑华,邹桂莲,等.基于使用性能的浇注式沥青混凝土设计[J].中南大学学报(自然科学版),2016,47(8):2828-2834.
[4] 杨锡武,刘威勤,刘克.CRP改性浇注式沥青混凝土路用性能试验研究[J].公路,2016(5):15-19.
[5] 盛兴跃,李睿,郝增恒,等.有机降温剂对聚合物改性浇注式沥青的性能影响[J].中国公路,2016(1):140-143.
[6] 赵国云,邵强,闫东波.钢桥面铺装浇注式沥青混合料级配性能[J].公路交通科技,2013,30(6):75-81.
[7] 陈仕周,闫东波.钢桥面浇注式沥青混凝土铺装技术[M].北京:人民交通出版社,2015.
[8] 山宏宇,李倩,秘林源,等.浇筑式钢桥面铺装层推挤变形病害机理分析[J].土木建筑与环境工程,2016,38(3):104-109.
[9] 重庆交通科研设计院.公路钢箱梁桥面铺装设计与施工技术指南[M].北京:人民交通出版社,2006.
[10] 中华人民共和国交通运输.公路工程沥青及沥青混合料试验规程:JTG E20—2011[S].北京:人民交通出版社,2011.
[11] 郝增恒.微观尺度下浇筑式沥青混合料超热老化机理[J].建筑材料学报,2013,16(3):521-524.
[12] 盛兴跃,李璐,李睿.运输时间对浇注式沥青混合料性能的影响[J].公路工程,2015,40(2):97-99.
[13] 李璐,郝增恒,盛兴跃.基于红外光谱的浇注式沥青超热低氧老化机理[J].公路交通科技,2016,33(11):20-25.