冷拌冷铺混合料组成设计与强度关系研究
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摘要
基于固化剂、油石比和含水率对冷拌冷铺混合料性能的影响,研究分析了掺固化剂的冷拌冷铺混合料的微观结构和硬化机理。结果表明:含硫铝酸钙型固化剂的冷拌冷铺混合料比掺PO52. 5水泥的冷拌冷铺混合料的性能优越,前者4 h抗压强度和抗折强度分别是后者的2倍和1. 6倍,两者皆以固化剂掺量5. 5%、油石比5. 5%、含水率4%为最佳配合比;与PO52. 5水泥相比,含硫铝酸钙型固化剂形成钙矾石固相可吸收更多水分,从而加速乳化沥青破乳,其水化产物能改善冷拌冷铺混合料的微观网络结构。
The beneficial effects of PO52. 5 cement,curing agent containing calcium sulpho aluminate,asphalt-aggregate ratio and water ratio on performance properties of normal temperature asphalt mixture including marshall stability,compressive strength,flexural strength,were studied in the laboratory. The hydration-hardening mechabsim and microstructures of normal temperature asphalt mixture were analyzed with scanning electron microscope( SEM) and DTA/TG. The results indicate that the mixtures prepared with curing agent containing calcium sulphoaluminate have better performance than those containing PO52. 5. 5. 5% cement,5. 5% asphalt emulsion and 4% water contents are recommended. The influencing mechanism of curing agent can be summarized as: curing agent promotes emulsified asphalt de-emulsion and its hydrations improves pastes structure.
The beneficial effects of PO52. 5 cement,curing agent containing calcium sulpho aluminate,asphalt-aggregate ratio and water ratio on performance properties of normal temperature asphalt mixture including marshall stability,compressive strength,flexural strength,were studied in the laboratory. The hydration-hardening mechabsim and microstructures of normal temperature asphalt mixture were analyzed with scanning electron microscope( SEM) and DTA/TG. The results indicate that the mixtures prepared with curing agent containing calcium sulphoaluminate have better performance than those containing PO52. 5. 5. 5% cement,5. 5% asphalt emulsion and 4% water contents are recommended. The influencing mechanism of curing agent can be summarized as: curing agent promotes emulsified asphalt de-emulsion and its hydrations improves pastes structure.
引文
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[8]ORUC S,CELIK F,AKPINAR M V. Effect of cement onemulsified asphalt mixtuers[J]. Journal of materials engi-neering and performance,2007,15(6):578-583.
[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.
[3]周源.水泥含量对乳化沥青冷再生混合料疲劳性能的影响[J].中外公路,2013(1):226-229.
[4]王振军,杜少文,肖晶晶,等.水泥乳化沥青混合料性能的影响因素[J].建筑材料学报,2011(4):497-501,511.
[5]肖晶晶,沙爱民,蒋玮,等.基于细微观试验的水泥乳化沥青混合料空隙特征[J].同济大学学报(自然科学版),2013(9):1398-1403.
[6]杜少文.外加材料对乳化沥青冷再生混合料路用性能的影响[J].建筑材料学报,2013(3):534-538.
[7] Al NAGEIM H,Al-BUSALTAN S F,ATHERTON W,etal. A comparative study for improving the mechanicalproperties of coldbituminous emulsion mixtures with ce-ment and waste materials[J]. Construction and buildingmaterials,2012(36):743-748.
[8]ORUC S,CELIK F,AKPINAR M V. Effect of cement onemulsified asphalt mixtuers[J]. Journal of materials engi-neering and performance,2007,15(6):578-583.