| 膨胀剂对水泥稳定碎石温缩性能及干缩性能的影响研究 |
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| 引用本文： | 柴海成.膨胀剂对水泥稳定碎石温缩性能及干缩性能的影响研究[J].路基工程,2018,0(3):95-99. |
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| 作者姓名： | 柴海成 |
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| 作者单位： | 中铁十八局集团第四工程有限公司, 天津 300350 |
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| 摘 要： | 半刚性基层材料为我国最主要的基层类型，具有强度高、造价低廉等众多优点，然而只有保证期结构完整性的条件下，才能发挥其承载及传力作用。为此，选取钙矾石类膨胀剂，拟定5%，10%，15%，20%共4个膨胀剂掺量，采用干缩试验、温缩试验以及抗折强度试验，研究膨胀剂对水泥稳定碎石抗裂性能的影响。结果表明:添加膨胀剂后，水泥稳定碎石的温缩应变及温缩系数显著降低；随着膨胀剂掺量的增大，膨胀剂掺量对水泥稳定碎石温缩性能影响的敏感性降低；随其养生龄期的延长，水泥稳定碎石的干缩应变逐步增大，添加膨胀剂后，干缩应变和干缩系数显著降低。稳定剂掺量与抗折强度回归分析表明，当稳定剂掺量为7.0%时，抗折强度最大，为最佳掺量。
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| 关 键 词： | 半刚性基层 水泥稳定碎石 膨胀剂 温缩开裂 干缩开裂 |
| 收稿时间： | 2019-11-10 |
Research on the Influence of Expansive Agent on the Temperature Shrinkage and Dry Shrinkage Performance of the Cement Stabilized Macadam |
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| Abstract: | Semi-rigid base material has many virtues, such as high strength and low cost, so it is the main basic type in China. However, Semi-rigid base material can play a role of the bearing and transmit force only under the condition of the structure integrity. Selected the ettringite expansive agent and designed four contents, namely 5%, 10%, 15% and 20% to research on the influence of the expansive agent on the crack resistance of the cement stabilized macadam mixture based on the dry shrinkage test, the temperature shrinkage test and flexural strength test. The test results show that the temperature shrinkage strain and temperature shrinkage coefficient of the cement stabilized macadam decrease significantly by adding the expansive agent; The effect susceptibility on the temperature shrinkage performance reduces with the increase content of the expansive agent; with the extension of the keeping time, the dry shrinkage strain of the cement stabilized macadam increases gradually, after adding expansive agent, the dry shrinkage strain and the dry shrinkage coefficient decrease significantly. Regression analysis of the expansive agent dosages and flexural strength shows that the flexural strength is the maximum when the dosage of stabilized agent is 7.0%, so it is the optimum content of the expansive agent. |
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