锂渣复合粉煤灰混凝土抗氯离子渗透及早期收缩性能的试验研究.pdfVIP

锂渣复合粉煤灰混凝土抗氯离子渗透 及早期收缩性能的试验研究 摘 要 论文结合新疆本地实际，以还未被利用的锂渣和产量很大的粉煤灰作为高性能混凝 土的矿物掺合料配制高性能混凝土，分析水胶比、锂渣掺量和粉煤灰掺量这三种因素对 混凝土抗压强度的影响，找出影响混凝土抗压强度的主要因素；并以抗压强度和主要影 响因素为依据，找出最优的组合进行锂渣复合粉煤灰高性能混凝土的抗氯离子渗透试验 研究和早期收缩试验研究，得出以下结论： 水胶比和锂渣掺量是锂渣复合粉煤灰高性能混凝土 28 天龄期内抗压强度的主要影 响因素，锂渣复合粉煤灰高性能混凝土中锂渣的最佳掺量范围在 10%-15%，在掺量为 50%时，锂渣复合粉煤灰高性能混凝土的抗压强度、氯离子扩散系数和早期收缩性能都 有好的表现；添加锂渣和粉煤灰掺合料的混凝土的早期抗氯离子扩散系数要大大优于普 通混凝土；锂渣掺合料的添加对于减小混凝土的早期收缩贡献很大；锂渣复合粉煤灰高 性能混凝土在耐久性表现优异主要是锂渣和粉煤灰的掺入改善了混凝土界面过渡区的 结构和优化了界面过渡区水化产物的化学成分。 关键词：锂渣；粉煤灰；抗氯离子渗透；早期收缩；微观分析 Ⅰ Experimental Study on Chloride-penetration Resistance and Early Shrinkage in Lithium Slag Composite Fly Ash of High Performance concrete Abstract Based on the project of local practical of Xinj iang, with lithium slag an fly ash as mineral admixture makes concrete, finds major factors on the basis of analyses that influence on water-binder ratio, lithium slag, fly ash; then base on its, finds the optimal have combination that do experiment of Chloride-penetration Resistance and Self-shrinkage, get the following conclusion: Water-blinder ratio and lithium slag are major factors that it impact on compressive strength within 28 days age, lithium slag-saturation in mortar ranges from10% to 15%, when mixing content is 50%, it have a good performance that compressive strength, chloride diffusion coefficient, self-shrinkage; lithium slag composite fly ash of HPC chloride diffusion coefficient is much better than common concrete; lithium contributions to decrease of self-shrinkage for lithium slag composite fly ash of HPC; the durability lithium slag composite fly ash of HPC has