摘要
针对现有碱激发修补材料无法适应于海洋工程高湿、高盐环境下混凝土腐蚀修复的难题,通过掺加聚丙烯酸乳液(PAA)调控固结体的柔韧性,研制出一种高强低缩高耐久的PAA改性碱激发矿渣修补材料,并分析其性能形成机理。结果表明:当水玻璃模数大于1.2时,碱激发矿渣修补材料的力学性能与水玻璃掺量呈正相关。水玻璃模数1.2、掺量15%是矿渣修补材料的最佳激发配比。PAA填充在碱激发矿渣修补材料无定形胶凝物质的间隙,显著增强其力学性能、粘结性能、体积稳定性能和抗硫酸盐性能。
Introduction The existing alkali-activated repair materials cannot adapt to the corrosion repair of concrete in marine engineering with high humidity and high salt environments.In this paper,a polyacrylic acid lotion(PAA)modified alkali-activated slag repair material with high strength,low shrinkage and high durability was developed by adding PAA to regulate the flexibility of the consolidation body,and its performance formation mechanism was analyzed.The results indicate that the mechanical properties of alkali-activated slag repair materials are positively correlated with the content of sodium silicate added when the modulus of sodium silicate is greater than 1.2.The optimal activating ratio for slag repair materials is 1.2 modulus and 15% content of sodium silicate.PAA filling in the gaps of amorphous cementitious substances in alkali-activated slag repair materials significantly enhances its mechanical properties,bonding properties,volume stability,and sulphate resistance.Methods A powder used was cement(i.e.,P·Ⅱ 52.5 grade Portland cement)mixed with slag(i.e.,a granulated blast furnace slag)with a hydraulic coefficient of 2.18,an activity coefficient of 0.25,an alkalinity coefficient of 1.11,and a quality coefficient of 2.07.Alkali activator used was sodium silicate(with a modulus of n=3.3 and a Baume degree of 40)and sodium hydroxide(granular sodium hydroxide with a purity of≥98%).The organic lotion was a polyacrylic lotion with a molecular weight of 3000-5000 and a solid content of≥30%.The aggregate was river sand with the maximum particle size of of 2.5 mm,the bulk density of 1.6 g/cm^(3),and the apparent density of 2.5 g/cm^(3).Water used was tap water.Sodium hydroxide weighed was fully dissolved in sodium silicate under stirring magnetically.The solution was colourless and transparent,and there were no suspended sodium hydroxide particles in the solution.Subsequently,a beaker with the solution was covered with a thin film to prevent the evaporation of water due to the dissolution and heat release
作者
刘志勇
蒋金洋
李洋
石锦炎
刘淦
LIU Zhiyong;JIANG Jinyang;LI Yang;SHI Jinyan;LIU Gan(Jiangsu Key Laboratory of Civil Engineering Materials,Southeast University,Nanjing 211189,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2024年第2期498-512,共15页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划项目(2021YFB2601200)
国家自然科学基金重大项目(52293431)
江苏省杰出青年基金项目(BK20220071)。
