| 摘要: |
| 研究了CA砂浆（水泥乳化沥青砂浆）力学性能和体积对温度的稳定性.结果表明：温度从-10℃增加到40℃时，CA砂浆的抗压强度和弹性模量均呈降低趋势；对采用SBS改性乳化沥青的CA砂浆而言，乳化沥青/水泥质量比越大，其抗压强度随温度升高下降越快；相同乳化沥青/水泥质量比条件下，随着温度升高，采用未改性乳化沥青的CA砂浆抗压强度下降幅度大于采用SBS改性乳化沥青的CA砂浆.CA砂浆热膨胀系数随水泥/砂质量比和龄期的增大而降低，随外加水用量和乳化沥青/无机材料（水泥+砂）体积比增大而升高；采用改性剂对乳化沥青进行改性，能够降低CA砂浆的热膨胀系数，改善CA砂浆体积对温度的稳定性，其中以SBS改性剂的改善效果最好. |
| 关键词: CA砂浆 温度 强度 体积 稳定性 |
| DOI：10.3969/j.issn.1007 9629.2013.01.024 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（50602033） |
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| Temperature Stability of Mechanical Properties and Volume of CA Mortar |
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WANG Tao
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Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
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| Abstract: |
| The temperature stability of mechanical properties and volume of CA mortar（cement asphalt mortar） was studied. Results indicate that the compressive strength and elastic modulus of CA mortars decrease when temperature increases from -10℃ to 40℃. The compressive strength of CA mortar with SBS modified asphalt emulsion decreases significantly with increase of temperature when mass ratio of asphalt emulsion to cement is higher. The decrease range of compressive strength of CA mortar with asphalt emulsion is greater than that of CA mortar with SBS modified asphalt emulsion at same mass ratio of asphalt emulsion to cement when temperature increases. The thermal expansion coefficient（TEC） of CA mortar decreases with increasing mass ratio of cement to sand and curing time, whereas it increases with increasing water amount and volume ratio of asphalt emulsion to inorganic material（cement and sand）. After asphalt emulsion is modified, the TEC of CA mortar decreases, the temperature stability of volume of CA mortar is improved, and SBS modifier is the best for the improvement. |
| Key words: CA mortar temperature strength volume stability |
