修补砂浆抗盐冻性能的试验研究
发布时间：2018-12-31 15:10
【摘要】：季冻区水泥混凝土路面、桥梁防撞墙等部位常受到除冰盐引起的盐冻破坏,修补材料的抗盐冻性能影响修补工程的长期质量。制备了水泥基聚合物修补砂浆,通过掺加憎水剂和聚丙烯纤维来改善修补砂浆的抗渗性、韧性和体积稳定性,综合提升修补砂浆的抗盐冻性能。试验结果表明,掺加1.5%的有机硅憎水剂和0.2%的聚丙烯纤维均可明显提高修补砂浆的折压比,降低收缩率,使修补砂浆的抗裂能力得以提升;电通量降低明显,28次单面盐冻试验后,试件单位面积剥落物明显降低,修补砂浆的耐久性得到改善。
[Abstract]:In quarter-frozen area cement concrete pavement and bridge anti-collision wall are often damaged by salt freezing caused by deicing salt. The long-term quality of repair works is affected by the salt frost resistance of repair materials. Cement-based polymer mortar was prepared to improve the impermeability, toughness and volume stability of the modified mortar by adding hydrophobic agent and polypropylene fiber. The experimental results show that the addition of 1.5% silicone hydrophobic agent and 0.2% polypropylene fiber can obviously increase the ratio of broken to pressure of repaired mortar, reduce the shrinkage, and improve the crack resistance of the repaired mortar. After 28 times of single side salt freezing test, the spalling matter per unit area of the specimen was obviously reduced, and the durability of the repaired mortar was improved.
【作者单位】： 沈阳建筑大学材料科学与工程学院;
【基金】：住房与城乡建设部项目(2014-K4-021)
【分类号】：U414;U444
本文编号：2396756
[Abstract]:In quarter-frozen area cement concrete pavement and bridge anti-collision wall are often damaged by salt freezing caused by deicing salt. The long-term quality of repair works is affected by the salt frost resistance of repair materials. Cement-based polymer mortar was prepared to improve the impermeability, toughness and volume stability of the modified mortar by adding hydrophobic agent and polypropylene fiber. The experimental results show that the addition of 1.5% silicone hydrophobic agent and 0.2% polypropylene fiber can obviously increase the ratio of broken to pressure of repaired mortar, reduce the shrinkage, and improve the crack resistance of the repaired mortar. After 28 times of single side salt freezing test, the spalling matter per unit area of the specimen was obviously reduced, and the durability of the repaired mortar was improved.
【作者单位】： 沈阳建筑大学材料科学与工程学院;
【基金】：住房与城乡建设部项目(2014-K4-021)
【分类号】：U414;U444
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