水泥对乳化沥青冷再生材料性能影响的宏微观分析
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摘要
为了研究水泥对乳化沥青冷再生材料性能的作用机理和确定水泥掺量的最佳范围,本研究对不同水泥掺量(0%~5%)的乳化沥青冷再生材料进行了微观形貌观测和化学成分分析,并对乳化沥青混合料性能进行宏观力学测试。通过扫描电镜测试和电子能谱分析表明:(1)扫描电镜观测到的纤维状晶体确实为水泥与混合料中的水相发生水化反应生成的水化产物,这些水泥水化产物和沥青形成的胶浆复合物在空间中呈立体网格结构;(2)水泥掺量为1%~2%时,水泥水化后的产物没有形成棱角分明的纤维晶体,呈圆柱状,纤维较短(<10μm),大多分布在5μm左右,当水泥掺量大于3%时,水化后的晶体分布致密,呈针状,纤维较长(部分水泥水化产物晶体长度> 20μm);(3)这些水泥水化产物对乳化沥青冷再生混合料具有"加筋"作用,能够提高乳化沥青冷再生混合料的早期强度。通过高温车辙试验、小梁低温弯曲试验及抗水损害试验研究发现:(1)乳化沥青冷再生混合料的高温稳定性和水稳定性随着水泥掺量的增加而提高;(2)低温性能随着水泥掺量的增加呈现先升高后降低的变化特性,当水泥掺量在1%~2%范围内,乳化沥青厂拌冷再生混合料性能最佳。
In order to study the interaction of cement on the property of emulsified asphalt cold recycled material and to determine the optimal range of cement content,the morphology and chemical composition of emulsified asphalt cold recycled materials with different cement contents( 0%-5%) are analyzed,and the performance of emulsified asphalt mixture is tested by macro mechanical test. The results of SEM test and electron spectroscopy analysis show that( 1) The fibrous crystals observed by SEM are the hydrated products of hydration of the water phase in cement and mixture,these cement hydrated products and the mortar composite formed by asphalt present a 3 D grid structure in space.( 2) When the cement content is 1%-2%,the products after cement hydration are not angled. The clear fiber crystal is cylindrical,and the fiber is short( < 10 μm),most of them are about 5 m. When the cement content is more than 3%,the crystals are dense,needle like,and the fiber is longer( length of some cement hydration products > 20 μm).( 3) These cement hydrated products have the "reinforcement"effect on emulsified asphalt cold recycled mixture,they can improve the early strength of emulsified asphalt cold recycled mixture. Through high temperature ruttingtest,trabecula low temperature bending test and anti-water damage test,it is found that( 1) The high temperature stability and water stability of emulsified asphalt cold recycled mixture increase with the increase of cement content.( 2) The low temperature performance increases at first and then decreases with the increase of cement content. When the cement content is in the range of 1%-2%,the performance of plantmixed emulsified asphalt cold recycled mixture is the best.
In order to study the interaction of cement on the property of emulsified asphalt cold recycled material and to determine the optimal range of cement content,the morphology and chemical composition of emulsified asphalt cold recycled materials with different cement contents( 0%-5%) are analyzed,and the performance of emulsified asphalt mixture is tested by macro mechanical test. The results of SEM test and electron spectroscopy analysis show that( 1) The fibrous crystals observed by SEM are the hydrated products of hydration of the water phase in cement and mixture,these cement hydrated products and the mortar composite formed by asphalt present a 3 D grid structure in space.( 2) When the cement content is 1%-2%,the products after cement hydration are not angled. The clear fiber crystal is cylindrical,and the fiber is short( < 10 μm),most of them are about 5 m. When the cement content is more than 3%,the crystals are dense,needle like,and the fiber is longer( length of some cement hydration products > 20 μm).( 3) These cement hydrated products have the "reinforcement"effect on emulsified asphalt cold recycled mixture,they can improve the early strength of emulsified asphalt cold recycled mixture. Through high temperature ruttingtest,trabecula low temperature bending test and anti-water damage test,it is found that( 1) The high temperature stability and water stability of emulsified asphalt cold recycled mixture increase with the increase of cement content.( 2) The low temperature performance increases at first and then decreases with the increase of cement content. When the cement content is in the range of 1%-2%,the performance of plantmixed emulsified asphalt cold recycled mixture is the best.
引文
[1]杜少文,王振军.水泥改性乳化沥青混凝土力学性能与微观机理[J].同济大学学报:自然科学版,2009,37(8):1040-1043.DU Shao-wen,WANG Zhen-jun. Mechanical Properties and Microcosmic Mechanism of Cement Modified Asphalt Emulsion Concrete[J]. Journal of Tongji University;Natural Science Edition,2009,37(8):1040-1043.
[2]钟梦武,吴超凡,于永生,等.掺加水泥的乳化沥青冷再生沥青混合料设计方法研究[J].公路,2008(1):195-199.ZHONG Meng-wu,WU Chao-fan,YU Yong-sheng,et al.A Study on Design Method of Cold Reclaimed Mixture Using Emulsion Asphalt and Cement[J]. Highway,2008(1):195-199.
[3]袁文豪,沙爱民,胡立群,等.水泥、乳化沥青及其用量对水泥-乳化沥青混合料性能的影响[J].筑路机械与施工机械化,2005,22(1):32-35.YUAN Wen-hao, SHA Ai-min, HU Li-qun, et al.Cement,Emulsified Asphalt and Their Quantities Impact on Performance of Cement and Emulsified Asphalt Mixture[J]. Road Machinery&Construction Mechanization,2005,22(1):32-35.
[4]徐金枝,郝培文,刘丽.泡沫沥青冷再生混合料力学特性试验[J].公路交通科技,2011,28(12):10-15.XU Jin-zhi,HAO Pei-wen,LIU Li. Test of Mechanical Property of Cold Recycled Mixture with Foamed Bitumen[J]. Journal of Highway and Transportation Research and Development,2011,28(12):10-15.
[5]杨彦海,杨野,温俊生,等.基于正交试验的乳化沥青冷再生材料成型养生方法试验研究[J].辽宁省交通高等专科学校学报,2014,16(2):1-5.YANG Yan-hai, YANG Ye, WEN Jun-sheng, et al.Experimental Research on Molding and Curing for Emulsified Asphalt Cold Recycling Mixture Using Orthogonal Test[J]. Journal of Liaoning Provincial College of Communications,2014,16(2):1-5.
[6]肖晶晶,沙爱民,蒋玮,等.水泥乳化沥青混合料性能试验[J].长安大学学报:自然科学版,2014,34(2):22-28.XIAO Jing-jing, SHA Ai-min, JIANG Wei, et al.Performance Test of Cement Emulsified Asphalt Mixture[J]. Journal of Chang'an University:Natural Science Edition,2014,34(2):22-28.
[7]严金海,倪富健,陶卓辉,等.水泥对乳化沥青就地冷再生混合料的作用机理研究[J].交通运输工程与信息学报,2009,7(4):38-44.YAN Jin-hai, NI Fu-jian, TAO Zhuo-hui, et al.Mechanism of Cement to the Cold In-place Recycled Mixture of Asphalt Emulsion[J]. Journal of Transportation Engineering and Information, 2009, 7(4):38-44.
[8] DB21/T 2448—2015,沥青路面厂拌冷再生设计与施工技术规范[S].DB21/T 2448—2015,Technical Specifications for Central Plant Cold Recycling Design and Construction of Asphalt Pavement[S].
[9] JTG F30—2014,公路水泥混凝土路面施工技术细则[S].JTG F30—2014,Technical Guidelines for Construction of Highway Cement Concrete Pavements[S].
[10]关宏信,张起森,徐暘,等.沥青混合料中温车辙试验研究[J].公路交通科技,2010,27(11):38-42.GUAN Hong-xin, ZHANG Qi-sen, XU Yang, et al.Laboratory Rutting Test for Bituminous Mixture at Medium Temperature[J]. Journal of Highway and Transportation Research and Development,2010,27(11):38-42.
[11] JTG F40—2011,公路沥青路面施工技术规范[S].JTG F40—2011,Technical Specifications for Construction of Highway Asphalt Pavements[S].
[12]董泽蛟,谭忆秋,曹丽萍,等.乳化沥青冷再生混合的室内设计与性能评价研究[J].公路交通科技,2006,23(2):43-47.DONG Ze-jiao, TAN Yi-qiu, CAO Li-ping, et al.Research on Indoor Design and Performance Evaluation of Cold Recycled Mixture with Emulsified Asphalt[J].Journal of Highway and Transportation Research and Development,2006,23(2):43-47.
[13]杨彦海,董帅,杨野,等.基于神经网络冷再生层最大剪应力预测[J].沈阳建筑大学学报:自然科学版,2017,33(3):467-474.YANG Yan-hai,DONG Shuai,YANG Ye,et al. The Maximum Shear Stress Prediction Research of Cold Regeneration Based on Neural Network[J]. Journal of Shenyang Jianzhu University:Natural Science Edition,2017,33(3):467-474.
[14]李金平,章金钊,盛煜.冻土区水泥和沥青路面病害分布规律探讨[J].公路交通科技,2010,27(7):18-24.LI Jin-ping, ZHANG Jin-zhao, SHENG Yu. Study on Distribution Patterns of Distresses in Cement Concrete Pavement and Asphalt Pavement in Permafrost Regions[J]. Journal of Highway and Transportation Research and Development,2010,27(7):18-24.
[15]孙岩松.水泥掺量对乳化沥青冷再生混合料性能的影响[J].武汉理工大学学报,2013,35(4):45-48.SUN Yan-song. Influence of Portland Cement on the Performance of Emulsified Asphalt Cold Regeneration[J]. Journal of Wuhan University of Technology,2013,35(4):45-48.
[16]严金海,倪富健,陶卓辉,等.水泥对乳化沥青就地冷再生混合料的作用机理研究[J].交通运输工程与信息学报,2009,7(4):38-44.YAN Jin-hai, NI Fu-jian, TAO Zhuo-hui, et al.Mechanism of Cement to the Cold In-place Recycled Mixture of Asphalt Emulsion[J]. Journal of Transportation Engineering and Information, 2009, 7(4):38-44.
[17]王振军,沙爱民.水泥乳化沥青复合胶浆微观结构特征[J].长安大学学报:自然科学版,2009,29(3):11-14.WANG Zhen-jun,SHA Ai-min. Microstructure Characters of Cement Emulsified Asphalt Composite Mastics[J].Journal of Chang'an University:Natural Science Edition,2009,29(3):11-14.
[18]吴旷怀,李燕枫,杨国梁,等.乳化沥青冷再生沥青混合料的研究[J].暨南大学学报:自然科学与医学版,2008,29(3):281-285.WU Kuang-huai,LI Yan-feng,YANG Guo-liang,et al.Experimental Research on the Cold Recycled Asphalt Mixtures with Emulsified Asphalt[J]. Journal of Jinan University:Natural Science Edition, 2008, 29(3):281-285.
[19]李志刚,郝培文,徐金枝.冻融循环作用对乳化沥青冷再生混合料抗剪性能的影响[J].材料导报,2016,27(10):121-125.LI Zhi-gang,HAO Pei-wen,XU Jin-zhi. Study on Impacts of Freeze-thaw Cycles on the Shear Performances of Emulsified Asphalt Cold Recycle Mixture[J]. Materials Review,2016,27(10):121-125.
[20] JTGE20—2011,公路工程沥青及沥青混合料试验规程[S].JTGE20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].
[2]钟梦武,吴超凡,于永生,等.掺加水泥的乳化沥青冷再生沥青混合料设计方法研究[J].公路,2008(1):195-199.ZHONG Meng-wu,WU Chao-fan,YU Yong-sheng,et al.A Study on Design Method of Cold Reclaimed Mixture Using Emulsion Asphalt and Cement[J]. Highway,2008(1):195-199.
[3]袁文豪,沙爱民,胡立群,等.水泥、乳化沥青及其用量对水泥-乳化沥青混合料性能的影响[J].筑路机械与施工机械化,2005,22(1):32-35.YUAN Wen-hao, SHA Ai-min, HU Li-qun, et al.Cement,Emulsified Asphalt and Their Quantities Impact on Performance of Cement and Emulsified Asphalt Mixture[J]. Road Machinery&Construction Mechanization,2005,22(1):32-35.
[4]徐金枝,郝培文,刘丽.泡沫沥青冷再生混合料力学特性试验[J].公路交通科技,2011,28(12):10-15.XU Jin-zhi,HAO Pei-wen,LIU Li. Test of Mechanical Property of Cold Recycled Mixture with Foamed Bitumen[J]. Journal of Highway and Transportation Research and Development,2011,28(12):10-15.
[5]杨彦海,杨野,温俊生,等.基于正交试验的乳化沥青冷再生材料成型养生方法试验研究[J].辽宁省交通高等专科学校学报,2014,16(2):1-5.YANG Yan-hai, YANG Ye, WEN Jun-sheng, et al.Experimental Research on Molding and Curing for Emulsified Asphalt Cold Recycling Mixture Using Orthogonal Test[J]. Journal of Liaoning Provincial College of Communications,2014,16(2):1-5.
[6]肖晶晶,沙爱民,蒋玮,等.水泥乳化沥青混合料性能试验[J].长安大学学报:自然科学版,2014,34(2):22-28.XIAO Jing-jing, SHA Ai-min, JIANG Wei, et al.Performance Test of Cement Emulsified Asphalt Mixture[J]. Journal of Chang'an University:Natural Science Edition,2014,34(2):22-28.
[7]严金海,倪富健,陶卓辉,等.水泥对乳化沥青就地冷再生混合料的作用机理研究[J].交通运输工程与信息学报,2009,7(4):38-44.YAN Jin-hai, NI Fu-jian, TAO Zhuo-hui, et al.Mechanism of Cement to the Cold In-place Recycled Mixture of Asphalt Emulsion[J]. Journal of Transportation Engineering and Information, 2009, 7(4):38-44.
[8] DB21/T 2448—2015,沥青路面厂拌冷再生设计与施工技术规范[S].DB21/T 2448—2015,Technical Specifications for Central Plant Cold Recycling Design and Construction of Asphalt Pavement[S].
[9] JTG F30—2014,公路水泥混凝土路面施工技术细则[S].JTG F30—2014,Technical Guidelines for Construction of Highway Cement Concrete Pavements[S].
[10]关宏信,张起森,徐暘,等.沥青混合料中温车辙试验研究[J].公路交通科技,2010,27(11):38-42.GUAN Hong-xin, ZHANG Qi-sen, XU Yang, et al.Laboratory Rutting Test for Bituminous Mixture at Medium Temperature[J]. Journal of Highway and Transportation Research and Development,2010,27(11):38-42.
[11] JTG F40—2011,公路沥青路面施工技术规范[S].JTG F40—2011,Technical Specifications for Construction of Highway Asphalt Pavements[S].
[12]董泽蛟,谭忆秋,曹丽萍,等.乳化沥青冷再生混合的室内设计与性能评价研究[J].公路交通科技,2006,23(2):43-47.DONG Ze-jiao, TAN Yi-qiu, CAO Li-ping, et al.Research on Indoor Design and Performance Evaluation of Cold Recycled Mixture with Emulsified Asphalt[J].Journal of Highway and Transportation Research and Development,2006,23(2):43-47.
[13]杨彦海,董帅,杨野,等.基于神经网络冷再生层最大剪应力预测[J].沈阳建筑大学学报:自然科学版,2017,33(3):467-474.YANG Yan-hai,DONG Shuai,YANG Ye,et al. The Maximum Shear Stress Prediction Research of Cold Regeneration Based on Neural Network[J]. Journal of Shenyang Jianzhu University:Natural Science Edition,2017,33(3):467-474.
[14]李金平,章金钊,盛煜.冻土区水泥和沥青路面病害分布规律探讨[J].公路交通科技,2010,27(7):18-24.LI Jin-ping, ZHANG Jin-zhao, SHENG Yu. Study on Distribution Patterns of Distresses in Cement Concrete Pavement and Asphalt Pavement in Permafrost Regions[J]. Journal of Highway and Transportation Research and Development,2010,27(7):18-24.
[15]孙岩松.水泥掺量对乳化沥青冷再生混合料性能的影响[J].武汉理工大学学报,2013,35(4):45-48.SUN Yan-song. Influence of Portland Cement on the Performance of Emulsified Asphalt Cold Regeneration[J]. Journal of Wuhan University of Technology,2013,35(4):45-48.
[16]严金海,倪富健,陶卓辉,等.水泥对乳化沥青就地冷再生混合料的作用机理研究[J].交通运输工程与信息学报,2009,7(4):38-44.YAN Jin-hai, NI Fu-jian, TAO Zhuo-hui, et al.Mechanism of Cement to the Cold In-place Recycled Mixture of Asphalt Emulsion[J]. Journal of Transportation Engineering and Information, 2009, 7(4):38-44.
[17]王振军,沙爱民.水泥乳化沥青复合胶浆微观结构特征[J].长安大学学报:自然科学版,2009,29(3):11-14.WANG Zhen-jun,SHA Ai-min. Microstructure Characters of Cement Emulsified Asphalt Composite Mastics[J].Journal of Chang'an University:Natural Science Edition,2009,29(3):11-14.
[18]吴旷怀,李燕枫,杨国梁,等.乳化沥青冷再生沥青混合料的研究[J].暨南大学学报:自然科学与医学版,2008,29(3):281-285.WU Kuang-huai,LI Yan-feng,YANG Guo-liang,et al.Experimental Research on the Cold Recycled Asphalt Mixtures with Emulsified Asphalt[J]. Journal of Jinan University:Natural Science Edition, 2008, 29(3):281-285.
[19]李志刚,郝培文,徐金枝.冻融循环作用对乳化沥青冷再生混合料抗剪性能的影响[J].材料导报,2016,27(10):121-125.LI Zhi-gang,HAO Pei-wen,XU Jin-zhi. Study on Impacts of Freeze-thaw Cycles on the Shear Performances of Emulsified Asphalt Cold Recycle Mixture[J]. Materials Review,2016,27(10):121-125.
[20] JTGE20—2011,公路工程沥青及沥青混合料试验规程[S].JTGE20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].