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引用本文:	刘海鹏,蒋应军,胡永林,叶伟奇,曹正道,蔡永涛.级配对乳化沥青冷再生混合料强度的影响[J].建筑材料学报,2018,21(3):503-510

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级配对乳化沥青冷再生混合料强度的影响
刘海鹏¹, 蒋应军¹, 胡永林², 叶伟奇³, 曹正道², 蔡永涛¹
1.长安大学特殊地区公路工程教育部重点实验室，陕西西安710064;2.金华市金东区公路管理段，浙江金华321000;3.金华市公路管理局，浙江金华321000

摘要:

采用垂直振动成型方法制备圆柱体试件，研究了矿粉、机制砂和95～190mm粗集料掺量对乳化沥青冷再生混合料强度的影响.结果表明：矿粉掺量（质量分数，下同）小于5%时，随矿粉掺量增加，冷再生混合料力学强度增大，但增大速率逐渐变缓，矿粉掺量大于3%时，与不掺加新集料乳化沥青冷再生混合料相比，其力学强度至少可提高5%；随机制砂掺量增加，冷再生混合料力学强度先增大后减小，机制砂掺量为20%时，混合料马歇尔稳定度、干湿劈裂强度和冻融劈裂强度均达到峰值，力学强度至少可提高17%；随95～190mm粗集料掺量增加，冷再生混合料干湿劈裂强度先增加后减小，当95～190mm粗集料掺量为20%时，冷再生混合料力学强度至少提高19%.因此，考虑材料经济性问题，建议冷再生混合料中矿粉掺量为3%，机制砂掺量为20%，95～190mm粗集料掺量为20%.

关键词: 乳化沥青冷再生混合料垂直振动法级配力学强度

DOI：103969/j.issn.1007 9629201803025

分类号:

基金项目:浙江交通科技项目（2016 2 17）

Influence of Gradation on Strength of Emulsified Asphalt Cold Recycled Mixture

LIU Haipeng¹, JIANG Yingjun¹, HU Yonglin², YE Weiqi³, CAO Zhengdao², CAI Yongtao¹

1.Key Laboratory for Special Area Highway Engineering of Ministry of Education, Changan University, Xian 710064, China;2.Jindong Highway Management Section, Jinhua 321000, China;3.Jinhua Highway Administration Bureau, Jinhua 321000, China

Abstract:

Cylindrical specimens were prepared by vertical vibration molding method. The effects of mineral powder, machine made sand and 95190mm coarse aggregate content on the strength of cold recycled asphalt mixture(CRM) were studied. The results show that the mineral powder content(by mass) is less than 5%, with the increase of the mineral powder content, CRM strength increases, but the increase rate gradually lowers. When mineral powder content is greater than 3%, compared to emulsified asphalt cold recycled mixture without new aggregate, the mechanical strength increases at least 5%. Adding machine made sand, CRM strength increases first, then decreases. When the sand content is 20%, the Marshall stability of mixture, dry wet splitting strength and freeze thaw splitting strength reach the peak, and the mechanical strength can be increased by more than 17%. With the 95190mm coarse aggregate content increasing, the dry wet splitting strength of mixture increases first and then decreases. When the 95190mm of coarse aggregate content is 20%, CRM strength increases by at least 19%. Therefore, considering the material cost, it is suggested that the content of mineral powder in CRM is 3%, the content of machine made sand is 20%, and the content of 95190mm coarse aggregate is 20%.

Key words: emulsified asphalt cold recycling mixture vertical vibration method gradation mechanical strength