| 冻融循环作用下玄武岩纤维-矿渣粉-粉煤灰混凝土压拉强度试验与细观结构 |
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| 引用本文： | 吴倩云,马芹永,王莹. 冻融循环作用下玄武岩纤维-矿渣粉-粉煤灰混凝土压拉强度试验与细观结构[J]. 复合材料学报, 2021, 38(3): 953-965. DOI: 10.13801/j.cnki.fhclxb.20200722.002 |
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| 作者姓名： | 吴倩云 马芹永 王莹 |
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| 作者单位： | 安徽理工大学土木建筑学院,淮南232001;安徽理工大学矿山地下工程教育部工程研究中心,淮南232001 |
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| 基金项目： | 安徽省高校领军人才团队资助项目(No.2016-16) |
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| 摘 要： | 对玄武岩纤维-矿渣粉-粉煤灰混凝土(BF-SP-FAC)进行了单轴抗压试验、劈裂抗拉试验、冻融循环试验、气孔结构测试试验和SEM分析.研究了不同冻融次数下BF-SP-FAC冻融损伤量、抗压强度、抗拉强度的变化,分析了气孔结构参数(含气量、气孔比表面积、气泡间距系数和气泡平均弦长)与BF-SP-FAC抗压强度、抗拉强度、...
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| 关 键 词： | 玄武岩纤维 矿渣粉 粉煤灰混凝土 损伤量 力学性能 微观结构 气孔结构参数 灰熵关联度 |
| 收稿时间： | 2020-05-14 |
Compression-tensile tests and meso-structure of basalt fiber-slag powder-fly ash concrete under freeze-thaw cycles |
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| Affiliation: | 1.School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China2.Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China |
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| Abstract: | The test on uniaxial compression, split tension, freeze-thaw cycle, air-void and SEM analysis were carried out on basalt fiber-slag powder-fly ash concrete (BF-SP-FAC). The changes of damage amount, compressive strength and tensile strength of BF-SP-FAC were studied under different freeze-thaw cycles. The relationships of air-void structure parameters (air content, specific surface area, spacing factor and average chord length) with compressive strength, tensile strength of BF-SP-FAC were analyzed. The effects of the air-void structure parameters on the compressive strength, tensile strength and damage amount were investigated by grey correlation entropy analysis. The results show that under the same freezing and thawing times, compared with other fiber dosage, BF-SP-FAC mixed with basalt fiber of 0.18vol% has the best frost resistance and the highest compressive strength and tensile strength. Under the same fiber content, the compressive and tensile strength of BF-SP-FAC decrease with the increase of air content, spacing factor, and average chord length, while the damage amount increases. The compressive strength and tensile strength of BF-SP-FAC increase with the increase of specific surface area, while the damage amount decreases. The most important factor to the compressive strength and tensile strength of BF-SP-FAC is specific surface area, the main factor to the damage amount of BF-SP-FAC is the average chord length. The minimum grey entropy correlations are 0.998 and 0.993, respectively. The establishment of relationships among air-void structure parameters, strength and freeze-thaw damage can predict the strength and freeze-thaw damage of concrete. |
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