乳化沥青对钢筋混凝土梁抗裂性能影响试验研究*
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（1 沈阳工业大学建筑工程学院， 沈阳 110870； 2 中冶焦耐工程技术有限公司， 大连 116085）［摘要］为了研究掺乳化沥青钢筋混凝土梁的弯曲抗裂性能，通过四点弯曲试验对不同乳化沥青掺量的5组共计10根钢筋混凝土梁进行试验测试，观察并记录了从加载开始至破坏整个过程中钢筋混凝土梁的裂缝开展、变形、承载力等情况，并与普通钢筋混凝土梁做对比。试验结果表明：较低乳化沥青掺量（1%～3%）能够明显改善钢筋混凝土梁的整体变形能力，提高钢筋混凝土梁的初裂荷载、跨中挠度，且对混凝土抗压强度影响较小；较高乳化沥青掺量（5%～7%）使钢筋混凝土梁的极限荷载降低较多，不能改善其韧性和整体变形能力。［关键词］乳化沥青; 钢筋混凝土梁; 极限荷载; 耐久性中图分类号：TU377 文献标识码：A 文章编号：1002-848X(2014)19-0092-03Experimental research on the crack resistance ability of reinforced concrete beam mixed with emulsified asphaltNing Baokuan1, Hu Haitao1, Zhang Simiao1, Mao Jianwei2（1 School of Architecture and Civil Engineering , Shenyang University of Technology, Shenyang 110870, China; 2 ACRE Coking and Refractory Engineering Consulting Corporation, MCC, Dalian 116085, China）Abstract: In order to research the bending crack resistance ability of reinforced concrete beam mixed with emulsified asphalt, four-point bending tests were carried out on 5 groups of 10 reinforced concrete beams with different quantities of mixed emulsified asphalt. Cracks, deformation and bearing capacity of the beams were observed and recorded from loading to destructive state, and then a comparison of experimental results was made between reinforced concrete beams mixed with emulsified asphalt and ordinary reinforced concrete beams. The experimental results show that lower emulsified asphalt dosages (from 1% to 3% )can significantly improve the overall deformation ability of the reinforced concrete beam, increase initial crack loading and midspan deflection, and influence little on compressive strength of the concrete. While higher asphalt emulsified asphalt dosages ( from 5% to 7% ) can reduce the ultimate load of the reinforced concrete beam sharply and fail to improve its toughness and overall deformation capacity.Keywords:emulsified asphalt; reinforced concrete beam; ultimate load; durability*国家自然科学基金（51279109），辽宁省教育厅资助项目（201364088）。作者简介：宁宝宽，教授，博士，Email：ningbk@126.com。参考文献［1］徐世烺，李庆华. 超高韧性复合材料控裂功能梯度复合梁弯曲性能理论研究［J］. 中国科学E辑:技术科学, 2009, 39(6):1081-1094.［2］张秀芳，徐世烺. 采用超高韧性水泥基复合材料提高钢筋混凝土梁弯曲抗裂性能研究(I):基本理论［J］.土木工程学报, 2008, 41(12): 48-54.［3］孙东根,汪波,朱新实,等. 水泥乳化沥青碎石基层材料性能与应用［J］.公路交通科技. 2007, 24（8）:27-31.［4］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.［5］沙爱民,王振军. 水泥乳化沥青混凝土胶浆-集料界面微观结构［J］.长安大学学报：自然科学版，2008，28（4）:1-6.
