泡沫沥青冷再生混合料抗剪性能的试验研究.pdfVIP

学兔兔 第 13卷第 1期 建 筑 材 料 学 报 V0l_13，No．1 2010年 2月 JOURNAL OF BUII DING MATERIALS Feb．，2010 文章编号：1007—9629(2010)01—0027—06 泡沫沥青冷再生混合料抗剪性能的试验研究 李秀君 (上海理工大学 环境与建筑学院，上海 200093) 摘要：采用单轴贯入试验，测定了泡沫沥青再生混合料在不同条件下的抗剪强度．研究表明：集料 级配在规定范围内时，泡沫沥青冷再生混合料抗剪强度最高；加入 1．5 (质量分数)的水泥可以使 泡沫沥青冷再生混合料抗剪强度提高5倍左右；沥青的发泡效果决定了对应最大抗剪强度的沥青 用量，发泡效果越好，对应最大抗剪强度的沥青用量越小；沥青黏度越高，相同沥青含量下泡沫沥青 冷再生混合料的抗剪强度就越高；采用40℃烘箱养生3 d的试件其抗剪强度与自然养生10 d的试 件相当；温度从4O℃升至6O℃，泡沫沥青冷再生混合料抗剪强度则下降一半． 关键词：泡沫沥青；冷再生混合料；抗剪强度；级配；养生 中图分类号：U4l6．217 文献标志码：A doi：10．3969／j．issn．1007—9629．2O10．01．006 Experimental Study on Shearing Properties of Cold_Recycled Mixtures Using Foamed Asphalt LI Xiu-j (School of Environment and Architecture，University of Shanghai for ScienceTechnology，Shanghai 200093，China) Abstract：By using uniaxial penetration test，shearing strength of cold—recycled mixtures of foamed asphalt (CRMFA)under different conditions was determined．The test result shows that the shearing strength of CRMFA is the highest when the gradation of the mixture is in the specified range．With 1．5 (by mass)of cement，shearing strength of CRMFA is increased 5 times．The asphalt content corresponding to the high— est shearing strength is dependent on the asphalt foam effect．The better the foam effect is，the less the as- phalt content can be．The higher the asphalt viscosity is，the higher the shearing strength is．The shearing strength of CRMFA that iS cured in oven of 40℃ for 3 d iS equivalent to that cured for 10 d under the nat ural environment．The shearing strength under 6O℃ iS about half of that under 4O℃． Key words：foamed asphalt；cold—recycled mixtures；she