麦秆纤维增强矿井隔热混凝土性能的试验研究

张逍; 辛嵩; 刘尚校; 骆伟

麦秆纤维增强矿井隔热混凝土性能的试验研究

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出版历程
- 发布日期: 2021-12-19

Experimental research on performance of wheat straw fiber-reinforced thermal insulation concrete for mining

摘要

摘要: 为了进一步改善矿井隔热混凝土的隔热性能，节约能源，目前的研究工作旨在利用1种可循环再生的绿色有机物——麦秆纤维，开发出具有更好的隔热与支撑性能的环保型矿用隔热混凝土；对麦秆纤维进行扫描电子显微镜观察，发现其存在大量的封闭微孔结构，是1种良好的隔热材料；将麦秆纤维以水泥质量的不同百分比（0%、2%、4%、6%、8%、10%）掺加到矿井隔热砂浆中，研制出的隔热混凝土导热系数逐渐降低，最终维持在0.201 0～0.200 2 W/（ｍ·Ｋ）；抗压强度先增高后降低，最大抗压强度为7.14 MPa。优选方案是掺加2%的麦秆纤维，与未掺加麦秆纤维的隔热混凝土相比，隔热性能与抗压强度都得到提升，隔热性能提升7.5%，抗压强度提升5.9%。
关键词：矿用隔热材料；麦秆纤维；导热系数；微观结构；抗压强度
- 矿用隔热材料 /
- 麦秆纤维 /
- 导热系数 /
- 微观结构 /
- 抗压强度
Abstract: To improve the thermal insulation performance of thermal insulation concrete for mining and save energy, we developed an environmentally friendly thermal insulation concrete with better thermal insulation and performance using a recyclable green organic matter wheat straw fiber. Scanning electron microscopy of the wheat straw fiber revealed that it had a large number of closed microporous structures, which are good heat insulation materials. Different percentages of wheat straw fibers（0%, 2%, 4%, 6%, 8%, 10%） and cement quality were mixed into the thermal insulation mortar, and the thermal conductivity of the thermal insulation concrete gradually decreased. When maintained at 0.201 0-0.200 2 W/（ｍ·Ｋ）, the compressive strength first increased and then decreased, and the maximum compressive strength was 7.14 MPa. Adding 2% of wheat straw fiber can improve the thermal insulation performance and compressive strength. Compared with the heat-insulation concrete without straw fiber, the heat-insulation property and compressive strength are improved, and the heat-insulation property and compressive strength are increased 7.5% and 5.9% respectively.
- mining insulation materials /
- wheat straw fiber /
- thermal conductivity /
- microstructure /
- compressive strength

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