Abstract
Qinghai Province is located in a high-cold and high-altitude area, with low average annual temperature, large daily temperature difference, strong ultraviolet irradiation, and arid climate with little rain in some places, which greatly exacerbates the deterioration of the material and structural performance, especially the frequent occurrence of earthquakes, mudslides, landslides, and other geologic hazards have also resulted in structural damage. However, common emergency repair materials have decreased strength at low temperatures and require complex maintenance conditions to harden, which increases the difficulty of repair. Based on the characteristics of high-cold and high-altitude areas, this study systematically investigated the working performance, mechanical properties, and durability of repair mortar in low-temperature environments using magnesium phosphate cement as a cementitious material. The practicality and applicability of engineering were verified through field applications. The research was applied in practice on the Gongyu Heka section of the Xili Expressway in Gonghe County, Hainan Tibetan Autonomous Prefecture, Qinghai Province. Two winter maintenance rapid repair demonstration projects were completed, with road repairs completed, and traffic reopened in less than three hours. This confirmed that the research results are of great significance for emergency rescue and rapid repair of damaged infrastructure, as well as the daily maintenance of infrastructure in the high-cold and high-altitude environment of Qinghai Province.
Keywords
high cold, high altitude, emergency, repair, mortar.
DOI
10.5703/1288284318150
Recommended Citation
Hou, Tiejun; Jing, Hao; Zhang, Chenchen; Bai, Shuxuan; Yuan, Yuan; Liu, Leqing; and Hou, Pengkun, "Performance Optimisation and Field Application Research of Emergency Repair Mortar in High-cold and High-altitude Areas" (2025). International Conference on Durability of Concrete Structures. 2.
https://docs.lib.purdue.edu/icdcs/2025/rrm/2
Performance Optimisation and Field Application Research of Emergency Repair Mortar in High-cold and High-altitude Areas
Qinghai Province is located in a high-cold and high-altitude area, with low average annual temperature, large daily temperature difference, strong ultraviolet irradiation, and arid climate with little rain in some places, which greatly exacerbates the deterioration of the material and structural performance, especially the frequent occurrence of earthquakes, mudslides, landslides, and other geologic hazards have also resulted in structural damage. However, common emergency repair materials have decreased strength at low temperatures and require complex maintenance conditions to harden, which increases the difficulty of repair. Based on the characteristics of high-cold and high-altitude areas, this study systematically investigated the working performance, mechanical properties, and durability of repair mortar in low-temperature environments using magnesium phosphate cement as a cementitious material. The practicality and applicability of engineering were verified through field applications. The research was applied in practice on the Gongyu Heka section of the Xili Expressway in Gonghe County, Hainan Tibetan Autonomous Prefecture, Qinghai Province. Two winter maintenance rapid repair demonstration projects were completed, with road repairs completed, and traffic reopened in less than three hours. This confirmed that the research results are of great significance for emergency rescue and rapid repair of damaged infrastructure, as well as the daily maintenance of infrastructure in the high-cold and high-altitude environment of Qinghai Province.
