- 目录
- 保温材料与建筑节能
- 首页
石墨烯对玻化微珠保温砂浆性能的影响及机理研究
作者：赵彦凯
（兰州新区石化产业投资集团有限公司，甘肃 兰州 730300）
摘要：研究了石墨烯掺量对玻化微珠保温砂浆抗压强度、干密度、导热系数及微观结构的影响，通过SEM分析了石墨烯对基体微观结构的影响机理。结果表明：水固比为0.6时，掺0.3%石墨烯的水泥砂浆抗压强度达到最高，为1.25 MPa，较对照组提高了13.6%；当石墨烯掺量为0.5%，水固比为0.6、0.8、1.0时，保温砂浆的导热系数较对照组分别降低了为16.0%、13.2%、18.3%。微观分析表明，石墨烯可加速水泥的水化反应，生成更多水化产物，使基体内连通微孔隙、微裂纹数量减少，进而提高基体的抗压强度，降低基体的导热系数。
关键词：石墨烯；保温砂浆；抗压强度；导热系数；微观结构
中图分类号：TU55+1.3 文献标识码：A 文章编号：1001-702X（2022）05-0119-04
Effect and mechanism of graphene on properties of glazed hollow beads thermal insulation mortar
ZHAO Yankai
（Lanzhou New Area Petrochemical Industry Investment Group Co. Ltd.，Lanzhou 730300，China）
Abstract：The effects of different graphene content on compressive strength，dry density，thermal conductivity and microstructure of glazed hollow beads thermal insulation mortar were studied in this paper，and the influence mechanism of graphene on microstructure of matrix was analyzed by scanning electron microscope. The results show that the compressive strength of cement mortar with 0.3% graphene reaches the maximum value of 1.25 MPa when the water-solid ratio is 0.6，which is 13.6% higher compared with the control group. The thermal conductivity of cement mortar with 0.5% graphene decreases by 16.0%，13.2% and 18.3%，compared with the control sample at the water-solid ratio of 0.6，0.8 and 1.0，respectively. The SEM photographs shows that graphene can accelerate the hydration reaction of cement，and more hydration products generated，resulting in the reduction of connected micro-pores and micro-cracks in the matrix. Thus，the compressive strength of the cement mortar improved and the thermal conductivity reduced.
Key words：graphene，thermal insulation mortar，compressive strength，thermal conductivity，microstructure