麦秆纤维增强矿井隔热混凝土性能的试验研究

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

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0.2010~0.2002 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%。

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 0.2010-0.2002 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.