| 不同集料混凝土抗冻性能与孔结构的关系 |
| Relationship Between the Pore Structure and Frost resistance of Concrete with Different Types of Aggregate |
| 投稿时间：2013-05-21 |
| 中文关键词:普通混凝土 集料 孔结构 抗冻性 |
| 英文关键词:ordinary concrete aggregate pore structure frost resistance |
| 基金项目:国家自然科学基金（51108282）；河北省自然科学基金（E2011210025）；河北省高等学校科学技术研究优秀青年基金(Y2011111) |
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| 中文摘要: |
| 研究了不同品种粗集料配制的不同水灰比混凝土的抗冻性能以及水泥石孔结构，并对两者之间的关系进行了分析。结果表明，吸水率较大的集料有利于降低水泥石孔隙率，而活性较高的集料则有利于降低其最可几孔径和大孔含量。本研究条件下，玄武岩集料附近水泥石的这三个参数均较低，故配制的混凝土抗冻性最优。花岗岩集料附近水泥石虽然最可几孔径和大孔含量均最低，但孔隙率最高，故配制的混凝土抗冻性较差，特别是当水灰比较高时。而在低水灰比条件下，较大的最可几孔径和较高的大孔含量对混凝土抗冻性的不利影响更为显著，有着较高大孔含量的石灰岩集料 |
| 英文摘要: |
| The frost resistance and pore structure of concrete prepared with different water cement ratios containing different types of coarse aggregates were tested, and the relationship between them was studied. The results show that, the aggregate with a higher water absorption is beneficial to reduce the porosity of the cement paste around it, whereas the most probable pore size and the volume content of the macropore content can be reduced by the high activity of the aggregates. Under the condition of this study, all the three pore parameters in the paste around basalt aggregate are lower, so the frost resistance of concrete is the best. Although the most probable pore size and macropore content of the cement paste around granite aggregate are the lowest, the porosity is the highest, so the concrete frost resistance is worse, especially for concrete with a higher water cement ratio. However, under the low water cement ratio condition, the adverse effect of the paste with a larger most probable pore size and higher macropore content on the frost resistance of concrete is more significant. After 200 freeze thaw cycles, the increase rate of the porosity of the paste around limestone is about 4 times of that around granite and basalt due to its higher macropore content, thus leading to the worst concrete frost resistance. |
| 孔丽娟,许旭栋,杜渊博.不同集料混凝土抗冻性能与孔结构的关系[J].石家庄铁道大学学报(自然科学版),2014,(1):88-94. |
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