Zhang Xiao, Liu Weitao, Zhang Shuo, Hou Jiaoyun
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
State Key Laboratory of Mining Disaster Prevention and Control Co-Found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
Materials (Basel). 2023 Mar 11;16(6):2266. doi: 10.3390/ma16062266.
The current research aimed to develop lightweight, environmentally friendly mortar materials using crop straw fibers with better insulation properties. The lightweight mortar samples were tested for moisture content, thermal conductivity and compressive strength on days 3, 7 and 28, respectively. Scanning electron tomography (SEM) was performed on the fiber-matrix bonding interface and internal fiber structure. The permeability rating was also measured to check the impermeability of the lightweight fiber mortar. Due to the high hygroscopicity of plant fibers, the thermal conductivity of the mortar was high at the initial molding stage; the thermal conductivity measured at day 28 decreased with increasing fiber content, while the mechanical properties gradually decreased. The impermeability test showed that the straw fiber mortar had better impermeability than the standard mortar. However, with the addition of 2% of 10 mm long fibers, we increased the compressive strength and thermal insulation properties. Numerical simulations verified that the fiber insulation mortar has good thermal insulation properties in high-temperature tunnels.
当前的研究旨在利用具有更好隔热性能的作物秸秆纤维开发轻质、环保的砂浆材料。分别在第3天、第7天和第28天对轻质砂浆样品进行了含水量、热导率和抗压强度测试。对纤维-基体粘结界面和内部纤维结构进行了扫描电子断层扫描（SEM）。还测量了渗透等级以检查轻质纤维砂浆的抗渗性。由于植物纤维的高吸湿性，砂浆在初始成型阶段的热导率较高；第28天测得的热导率随纤维含量的增加而降低，而机械性能逐渐下降。抗渗性测试表明，秸秆纤维砂浆的抗渗性优于标准砂浆。然而，添加2%的10毫米长纤维后，抗压强度和隔热性能得到了提高。数值模拟验证了纤维隔热砂浆在高温隧道中具有良好的隔热性能。
