早期养护温度对气凝胶水泥浆体涂层自密实混凝土隧道耐火性的影响

Effect of Early Curing Temperature on the Tunnel Fire Resistance of Self-Compacting Concrete Coated with Aerogel Cement Paste.

作者信息

Huang Kai-Lin, Li Shu-Jin, Zhu Ping-Hua

机构信息

School of Civil and Architectural Engineering, Changzhou Institute of Technology, Changzhou 213032, China.

Department of Civil Engineering, School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China.

出版信息

Materials (Basel). 2021 Oct 3;14(19):5782. doi: 10.3390/ma14195782.

DOI:10.3390/ma14195782

PMID:34640179

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8510061/

Abstract

In this paper, the effect of early curing temperature on the tunnel fire resistance of self-compacting concrete (SCC) coated with aerogel cement paste (ACP) was studied. The physical properties in terms of the compressive strength, flexural strength, and thermal conductivity of ACP were tested under different early curing temperatures. The tunnel fire resistance of ACP and SCC coated with ACP was determined, and the microstructure of ACP and SCC after a tunnel fire were characterized by scanning electron microscopy. The results show that the strength of ACP initially increased (by 10-40 °C) and then later decreased (by 40-60 °C) with the increase in early curing temperature. ACP under 40 °C early curing exhibited the minimum number of cracks and mass loss after the tunnel fire. Too high or too low early curing temperature reduced the thermal conductivity of ACP but accelerated the formation and expansion of microcracks during the tunnel fire. The residual compressive strength of SCC coated with ACP under 40 °C early curing after the tunnel fire was the highest, demonstrating the best tunnel fire resistance.

摘要

本文研究了早期养护温度对涂有气凝胶水泥浆体（ACP）的自密实混凝土（SCC）隧道耐火性能的影响。在不同早期养护温度下测试了 ACP 的抗压强度、抗折强度和导热系数等物理性能。测定了 ACP 及涂有 ACP 的 SCC 的隧道耐火性能，并通过扫描电子显微镜对隧道火灾后 ACP 和 SCC 的微观结构进行了表征。结果表明，随着早期养护温度的升高，ACP 的强度最初增加（10 - 40°C），随后降低（40 - 60°C）。40°C 早期养护的 ACP 在隧道火灾后出现的裂缝数量最少且质量损失最小。过高或过低的早期养护温度都会降低 ACP 的导热系数，但会加速隧道火灾期间微裂纹的形成和扩展。40°C 早期养护的涂有 ACP 的 SCC 在隧道火灾后的残余抗压强度最高，表明其隧道耐火性能最佳。