Choi Heesup, Inoue Masumi, Choi Hyeonggil, Lim Myungkwan, Kim Jihoon
Department of Civil and Environmental Engineering, Kitami Institute of Technology, Kitami 090-8507, Japan.
School of Architecture, Civil Environment and Energy Engineering, Kyungpook National University, Daegu 41566, Republic of Korea.
Materials (Basel). 2023 Mar 26;16(7):2632. doi: 10.3390/ma16072632.
This study aimed to develop a cementitious repair material that can be constructed in cold weather conditions. The addition of nitrite/nitrate-based antifreezing agents has been shown to increase the initial strength of cementitious repair materials in cold weather. However, increasing the amount of these agents may lead to an increase in deformation behavior and shrinkage cracking. In this study, the effects of different types and amounts of nitrite/nitrate-based antifreezing agents on the strength development and deformation behavior of cementitious repair materials under low-temperature conditions were evaluated. As a result, it was found that the addition of a large amount of calcium nitrite can promote hydration and improve the initial strength of the repair material, irrespective of the type of antifreezing agent. However, this also leads to an increase in shrinkage and the concern of shrinkage cracking. Therefore, a repair material that is repairable in winter was developed by balancing the initial strength and deformation behavior through the appropriate selection of antifreezing agents. The developed repair material can be used to repair structures in cold weather conditions, which is of great significance for the construction industry in Hokkaido, Japan.
本研究旨在开发一种可在寒冷天气条件下施工的水泥基修复材料。已表明添加亚硝酸盐/硝酸盐基防冻剂可提高寒冷天气下水泥基修复材料的早期强度。然而，增加这些剂的用量可能会导致变形行为增加和收缩开裂。在本研究中，评估了不同类型和用量的亚硝酸盐/硝酸盐基防冻剂对低温条件下水泥基修复材料强度发展和变形行为的影响。结果发现，无论防冻剂类型如何，添加大量亚硝酸钙均可促进水化并提高修复材料的早期强度。然而，这也会导致收缩增加以及收缩开裂的问题。因此，通过适当选择防冻剂来平衡早期强度和变形行为，开发出了一种冬季可修复的修复材料。所开发的修复材料可用于寒冷天气条件下的结构修复，这对日本北海道的建筑业具有重要意义。
