| 摘要: |
| 通过抗折强度、抗压强度、界面弯拉强度、体积变形以及红外光谱测试，研究了苎麻纤维（RF）掺量对硫铝酸盐水泥基材料力学性能与体积变形的影响.结果表明：随着RF掺量（体积分数，下同）的增加，硫铝酸盐水泥净浆的抗折强度和抗压强度均呈现先增加后减小的趋势，并且在纤维掺量为0.50%时同时达到峰值；在约束条件下，掺入RF对硫铝酸盐水泥净浆界面弯拉强度的提升幅度较大，纤维掺量为0.75%试样的28 d界面弯拉强度较无约束条件下提高了31.82%；RF的掺入显著增加了硫铝酸盐水泥净浆的膨胀量，其自生变形和干燥变形均随着RF掺量的增加逐渐增大；改性后的RF可以在硫铝酸盐水泥基材料的碱性环境中稳定发挥作用，提高试样的整体强度. |
| 关键词: 苎麻纤维 硫铝酸盐水泥 抗折强度 抗压强度 界面弯拉强度 体积变形 |
| DOI：10.3969/j.issn.1007-9629.2023.11.004 |
| 分类号:TU502.6 |
| 基金项目:湖北省建设科技计划项目（厅头〔2021〕2075号-38）；国家自然科学基金资助项目（51608402） |
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| Mechanical Properties and Volumetric Deformation of Ramie Fiber Reinforced Calcium Sulfoaluminate Cement-Based Materials |
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LIAO Yishun1,2,3, CHEN Jiawen1, ZHANG Tianxiao1
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1.School of Urban Construction， Wuhan University of Science and Technology， Wuhan 430065， China;2.Institute of High-Performance Engineering Structure， Wuhan University of Science and Technology， Wuhan 430065， China;3.Hubei Provincial Engineering Research Center of Urban Regeneration， Wuhan University of Science and Technology， Wuhan 430065， China
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| Abstract: |
| The evolution of the mechanical properties and volumetric deformation of calcium sulfoaluminate cement-based materials with different contents of ramie fiber（RF） was studied through the flexural strength， compressive strength， interfacial flexural-tensile strength， volumetric deformation and infrared spectroscopy analysis. The results show that the flexural strength and compressive strength of calcium sulfoaluminate cement pastes increase first and then decrease with the increase of RF contents（volume fraction， same as follow）， and reaches their peak values when the fiber content is 0.50%. Under constraint conditions， the addition of RF greatly improves the interfacial flexural tensile-strength of cement paste. At 28 days， the interfacial flexural-tensile strength with a fiber content of 0.75% is increased by 31.82% compared to the unconstrained specimen. The expansion of cement paste is increased by RF addition， and its autogenous deformation and drying deformation both grow with the increase of RF. The modified RF can play a stable role in the alkaline condition of cement-based materials， and improve the overall strength of the sample. |
| Key words: ramie fiber calcium sulfoaluminate cement flexural strength compressive strength interfacial flexural-tensile strength volumetric deformation |
