粗集料接触参数对沥青混合料力学性能影响分析

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牛冬瑜,谢希望,窦晖,颉俊杰,徐华鑫,熊锐.粗集料接触参数对沥青混合料力学性能影响分析[J].,2021,61(3):265-271

粗集料接触参数对沥青混合料力学性能影响分析

Impact analysis of contact parameters of coarse aggregate on mechanical properties of asphalt mixture

DOI：10.7511/dllgxb202103006

中文关键词:骨架结构混合料粗集料接触参数力学性能灰熵分析

英文关键词:skeleton structure mixture coarse aggregate contact parameters mechanical properties grey entropy analysis

基金项目:公路建设与养护技术、材料及装备交通运输行业研发中心(甘肃路桥建设集团有限公司)开放基金资助项目(GLKF201812)；国家自然科学基金资助项目(5160804551608046)；中国博士后科学基金资助项目(2017M613035)；福建省科技计划引导性项目(2019y0048).

作者	单位
牛冬瑜,谢希望,窦晖,颉俊杰,徐华鑫,熊锐

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中文摘要:

为了揭示骨架结构粗集料接触参数对力学性能的影响规律，采用SAC方法设计12种级配，分析其对应不同粗集料接触状态混合料的力学性能．首先提出颗粒接触主力链配位数(npfc)计算方法；其次，基于抗压、抗拉及抗剪试验结果，分析npfc对其影响规律，并通过灰熵分析研究传统指标参数、贝雷法中的CA比、主骨架干扰因子和npfc对力学性能相关性影响程度．结果表明：随着npfc的增大，抗压强度与抗剪强度先增大后减小，抗拉强度总体呈上升趋势；对于不同粗集料接触状态的混合料，当npfc在6.33~7.73时，混合料综合力学性能较优．同时，灰熵分析结果表明：npfc与力学性能指标的相关度相对较高．选取合理的npfc可优化沥青混合料内部主骨架接触状态，提高骨架结构的稳定性与混合料力学性能．

英文摘要:

In order to reveal the influence of the coarse aggregate contact parameters of the skeleton structure on the mechanical properties, the SAC method is used to design 12 different gradations, and the mechanical properties of the mixtures corresponding to different coarse aggregate contact states are analyzed. Firstly, the calculation method of coordination number of particle contact main chain force (npfc) is proposed. Secondly, based on the compression, tensile and shear test results, the influence of npfc is analyzed. The grey entropy analysis is carried out to study the influence of traditional index parameters, CA ratio in the Bailey method, disruption factor of dominant skeleton and npfc on the correlation of mechanical properties. The results show that with the increase of npfc, the compressive strength and shear strength first increase and then decrease, and the tensile strength generally shows an upward trend. For the mixture with different coarse aggregate contact states, when npfc is 6.33-7.73, the mixture comprehensive mechanical properties are better. At the same time, the results of grey entropy analysis show that the correlation between npfc and mechanical performance indicators is relatively high. So choosing a reasonable npfc can optimize the contact state of the dominant skeleton inside the asphalt mixture. The stability of the skeleton structure and the mechanical properties of the mixture will be improved as a result.

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粗集料接触参数对沥青混合料力学性能影响分析

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