硅石沥青混合料的路用性能研究

郭乃胜,王聪,赵颖华

大连海事大学学报 ›› 2014, Vol. 40 ›› Issue (2) : 65.

大连海事大学学报 ›› 2014, Vol. 40 ›› Issue (2) : 65.
材料科学与工程

硅石沥青混合料的路用性能研究

  • 为了提高公路沥青路面的抗滑性能,解决高质量集料短缺问题,使酸性集料在沥青路面的表面层中更好的应用,采用水煮法分析了添加不同掺量消石灰的硅石与沥青的黏附性,根据级配型抗滑沥青混合料设计理论,筛孔4.75mm以上的粗集料采用硅石,4.75mm以下的集料采用石灰岩,基于马歇尔设计法进行了硅石沥青混合料配合比设计及路用性能检验,并选择具有代表性的路段进行了硅石沥青路面试验路的铺筑和跟踪检测。结果表明,添加2%消石灰可以有效地提高沥青与硅石的黏附性,且添加2%消石灰的硅石沥青混合料配合比设计的各项性能检验结果均满足《规范》(JTG F40-2004)的技术要求,特别是水稳定性能表现较好;试验路段的路面使用状况良好,构造深度及摆值均较同路线普通沥青路面的高,且其随着使用时间的增长衰减较慢。这表明硅石作为一种酸性集料,以其合理的混合料配合比设计和采取适当的抗剥落措施,在公路沥青路面中的应用是可行的,且改善了路面的抗滑性能。

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Pavement performance of asphalt mixtures containing silica

  • To increase anti-skidding performance of highway asphalt pavement and solve scarcity of high quality aggregates, and then acid aggregates can be widely used in anti-skidding layer of asphalt pavement. The boiling water test was used to investigate adhesiveness between silica and asphalt added different contents of hydrated lime. Based upon the design theory of graded anti-skidding asphalt mixtures, the coarse aggregates retained on the 4.75mm sieve were adopted by silica, fine aggregates passing the 4.75mm sieve and filler were utilized by limestone. Marshall design method was performed to determine gradation composition design of asphalt mixtures containing silica, the laboratory performance tests were conducted to verify the gradation composition design of the mixtures. Then, the experimental section of asphalt pavement containing silica is chosen for construction and tracking detection at a typical region. The results show adhesiveness between silica and asphalt can be improved by the addition of hydrated lime at 2% by the weight of asphalt. The performance test results of asphalt mixtures containing silica added 2% hydrated lime replacing the same weight of filler can meet the requirements of the technical specifications (JTG F40-2004) especially that presents favorable moisture susceptibility. The experimental pavement conditions display an appreciable usage. The texture depth and British pendulum numbers of experimental pavement is higher than that of common asphalt pavement at the same route. Moreover, the texture depth and British pendulum numbers along with increasing time exhibit lower decrease than that of common asphalt pavement in terms of tracking detection results. This means silica, as a kind of acid aggregate, may be used in the highway asphalt pavement using appropriate gradations composition design and anti-stripping agent, ant that can improve the skidding resistance of asphalt pavement.

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摘要

为了提高公路沥青路面的抗滑性能,解决高质量集料短缺问题,使酸性集料在沥青路面的表面层中更好的应用,采用水煮法分析了添加不同掺量消石灰的硅石与沥青的黏附性,根据级配型抗滑沥青混合料设计理论,筛孔4.75mm以上的粗集料采用硅石,4.75mm以下的集料采用石灰岩,基于马歇尔设计法进行了硅石沥青混合料配合比设计及路用性能检验,并选择具有代表性的路段进行了硅石沥青路面试验路的铺筑和跟踪检测。结果表明,添加2%消石灰可以有效地提高沥青与硅石的黏附性,且添加2%消石灰的硅石沥青混合料配合比设计的各项性能检验结果均满足《规范》(JTG F40-2004)的技术要求,特别是水稳定性能表现较好;试验路段的路面使用状况良好,构造深度及摆值均较同路线普通沥青路面的高,且其随着使用时间的增长衰减较慢。这表明硅石作为一种酸性集料,以其合理的混合料配合比设计和采取适当的抗剥落措施,在公路沥青路面中的应用是可行的,且改善了路面的抗滑性能。

Abstract

To increase anti-skidding performance of highway asphalt pavement and solve scarcity of high quality aggregates, and then acid aggregates can be widely used in anti-skidding layer of asphalt pavement. The boiling water test was used to investigate adhesiveness between silica and asphalt added different contents of hydrated lime. Based upon the design theory of graded anti-skidding asphalt mixtures, the coarse aggregates retained on the 4.75mm sieve were adopted by silica, fine aggregates passing the 4.75mm sieve and filler were utilized by limestone. Marshall design method was performed to determine gradation composition design of asphalt mixtures containing silica, the laboratory performance tests were conducted to verify the gradation composition design of the mixtures. Then, the experimental section of asphalt pavement containing silica is chosen for construction and tracking detection at a typical region. The results show adhesiveness between silica and asphalt can be improved by the addition of hydrated lime at 2% by the weight of asphalt. The performance test results of asphalt mixtures containing silica added 2% hydrated lime replacing the same weight of filler can meet the requirements of the technical specifications (JTG F40-2004) especially that presents favorable moisture susceptibility. The experimental pavement conditions display an appreciable usage. The texture depth and British pendulum numbers of experimental pavement is higher than that of common asphalt pavement at the same route. Moreover, the texture depth and British pendulum numbers along with increasing time exhibit lower decrease than that of common asphalt pavement in terms of tracking detection results. This means silica, as a kind of acid aggregate, may be used in the highway asphalt pavement using appropriate gradations composition design and anti-stripping agent, ant that can improve the skidding resistance of asphalt pavement.

关键词

路面工程 / 沥青混合料 / 硅石 / 消石灰 / 抗滑性能

Key words

pavement engineering / asphalt mixtures / silica / hydrated lime / skidding resistance

引用本文

导出引用
郭乃胜,王聪,赵颖华. 硅石沥青混合料的路用性能研究[J]. 大连海事大学学报. 2014, 40(2): 65
GUO Nai-sheng, WANG Cong, ZHAO Ying-hua. Pavement performance of asphalt mixtures containing silica[J]. Journal of Dalian Maritime University. 2014, 40(2): 65

基金

国家自然科学基金项目(51308084);大连市交通科技项目(2009-7);中央高校基本科研项目(3132014223)

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