摘要
为解决季节性冰冻地区高速公路混凝土护栏因雨雪天气抛洒融雪剂发生剥蚀破坏问题,在常规修补砂浆配方基础上,分别掺入高分子聚合物、硅灰、磨细粉煤灰、防水剂4种改性剂,采用正交试验方法进行配方优选,以试验前后试件的抗压强度比、质量损失率为考核指标。试验过程中盐溶液采用4%浓度的NaCl溶液,冻融循环次数为200次。研究结果表明:掺入修复材料总质量1.0%的高分子聚合物,水泥质量7.0%的硅灰,水泥质量5.0%的磨细粉煤灰和修复材料总质量0.7%的防水剂,可显著提高修复材料的抗盐冻性能,抗压强度较未冻融试件降低8.3%,质量损失3.1%,可显著提高耐久性,降低养护成本。
To solve the problem of erosion and damage of the expressway concrete guardrail caused by the snowmelt agent thrown in seasonal frozen areas,based on the conventional formula of repair mortar,four modifiers including high-molecular polymer,silica fume,pulverized fly ash,and water-repellent admixture were added,respectively.The orthogonal experiment was used to optimize the formula,and the compressive strength ratio and mass loss rate of the specimens before and after the experiment were used as the assessment indexes.The NaCl solution with a concentration of 4%was adopted and the number of the freeze-thaw cycle was 200 times.The study results showed that the addition of 1.0%high-molecular polymer of total mass of repair materials,7.0%silica fume and 5.0%pulverized fly ash of cement mass,and 0.7%water-repellent admixture of total mass of repair materials could significantly increase the salt scaling resistance.Compared with the specimens without freeze-thaw,the compressive strength decreased by 8.3%and the mass loss was 3.1%,which can effectively improve durability and reduce maintenance costs.
作者
郭东红
GUO Donghong(Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan,Shanxi 030032,China)
出处
《山西交通科技》
2024年第1期59-62,共4页
Shanxi Science & Technology of Transportation
关键词
高速公路
混凝土护栏
修复材料
耐久性
正交试验
expressway
concrete guardrail
repair material
durability
orthogonal experiment
