【作者】 陈科；

【导师】 杨长辉；

【作者基本信息】 重庆大学 ， 材料学， 2002， 硕士

【摘要】 目前，建筑物的维修和加固改造技术已成为现代建筑技术的重要组成部分，倍受国内外的高度重视。国外的建筑物维修改造业已成为建筑业的重要组成部分。总体而言，建筑业将由“大兴土木阶段”逐渐步入维修维护阶段。植筋技术是一种新型的建筑物加固改造技术，由于特有的技术优点，其研究开发已成为现代建筑结构加固改造技术中极具活力的分支。由于已有研究对后植钢筋粘结锚固的失效形式、破坏机理未作出明确回答，对后植钢筋粘结锚固性能的影响因素未进行系统研究，对后植钢筋粘结锚固的长期有效性未予以试验证实，不利于植筋技术这种新型结构加固技术的推广应用，同时现有植筋锚固材料存在品种少、价格高、性能需要进一步改进和提高等局限性，已成为植筋技术发展的瓶颈，制约了植筋技术的进一步应用和发展，因此开发价格合理、性能优良的新型高性能无机质类锚固材料就显得尤为重要和迫切。本文采用硅酸盐水泥熟料、水淬高炉矿渣和复合激发剂组成的特种胶凝材料体系，以标准砂或特细砂为细集料制备了一种新型无机锚固材料，讨论了熟料/矿渣比，胶砂比、溶胶比、溶液配比等组成对新型无机锚固砂浆强度、凝结时间、收缩性能的影响；研究了新型无机锚固材料的抗渗性能、耐热性能、碳化性能、护筋性能；此外还研究了新型无机锚固材料与后植钢筋和被锚固混凝土的界面粘结性能，分析了后植钢筋粘结锚固的破坏机理和过程，确定了后植钢筋的失效形式与临界锚固长度，探讨了植筋锚固性能的影响因素；通过工程试用，研究了其工程应用效果。上述分析研究得出以下结论：①新型无机锚固材料具有早强、快硬、高强特点，10 h.抗压强度可达26.5MPa， 365天强度可达144.0MPa；初凝时间在40min.～3h.之间,且初终凝时间差在15分钟以内；在保湿条件下具有微膨胀性，膨胀率在0.5%以内。②可通过调整熟料/矿渣比、胶砂比、溶胶比、复合外加剂用量以改变新型无机锚固材料的性能，从而制备能满足C60～C100强度等级钢筋混凝土结构加固需要的锚固材料。③新型无机锚固材料的强度热稳定性、抗渗性、护筋性能良好。④在植筋锚固长度足够的条件下，混凝土与锚固砂浆的界面粘结强度大小直接决定了植筋锚固的控制荷载，粘结界面成为受力的薄弱环节。⑤钢筋的临界锚固长度受锚固材料抗拉强度、钢筋的相对保护层厚度和钢筋净间距、钢筋的直径和外形等诸多因素的影响，有效锚固深度一般为10d～15d。更多还原

【Abstract】 Nowadays the appraiser, maintenance and reinforcement techniques have become important parts in field of modern civil engineering and have been highly regarded at home and abroad. At abroad the buildings’ maintenance and rebuilding has become an important part of construction. Generally speaking, civil engineering will gradually step from ’large-scale construction period’ to maintenance period.Post-embedding steel technique is a new type of building reinforcing and rebuilding technique with excellent technical advantages, the research development of which has become a very active part of modern building structure reinforcing and rebuilding techniques. Since the existed research hasn’t illuminated the failure form of post-embedded reinforcing steel bar bonding anchor and its mechanism, hasn’t systematic research on factors influencing the function of post-embedded reinforcing steel bar bonding anchor, and also failed to test on the long period validity of post-embedded reinforcing steel bar bonding anchor, it is very unfavorable for the spread and application of post-embedding technique. In the meantime, the fact that the present post-embedding anchoring material is of few kinds, high prices and still-to-be-improved performance has become the bottleneck of the post-embedding technique’s development, which has restricted its further application and development. Therefore, it is of great importance to develop a new type high-performance inorganic anchoring material with reasonable price and improved performance.In the study, a new kind inorganic anchoring material was developed, which consisted of special binder and aggregate, the former is made from clinker, blast furnace slag and compound admixture, and the later is superfine sand. Effects of the factors such as clinker/slag, binder/sand, solution/binder and constituent of solution on the strength, set-time and contraction of the matrix made from the anchoring material were studied. Durability’s of the material such as permeability, heat-resistance, carbonation and steel bar-protection were tested. The bonding characters between anchoring material matrix and post-embedding steel bar, the matrix and the concrete structures were studied. The failure mechanism of anchoring system was analysed, and the failure form and chitical length of anchoring steel bar were determined, factors influencing the properities of anchoring were discussed, and engineering application was carried cent. On the basis of<WP=6>above mentioned, it can conclude as follows:①The new anchoring material has the character of high strength, high early strength and fast-setting, strength of the matrix at age of 10h and 365-day could reach to 26.5MPa and 144.0MPa respectively, the initial set of the paste is in the range of 40min-3h. and interval between initial set and finial set is lower than 15min. In the saturated meadium, the matrix exhibites expansion, and expansion ratio is lower than 0.5%.②The material could meet the require mart for anchoring of concrete constructure designed strength grade in the range of C60~C100 by way of adjusting the composition of admixture.③The material has excellent durability such as heat-resistance, impermeability and steel-protection.④The limit Load of the post-embedding steel ban is determined by the bonding strength between concrete and anchoring matrix, when length of embedding steel bar is enough, and the interface is the poor link. ⑤The critical Length of embedding steel bar is controlled by the factors such as flexture strength of the matrix, thickness of matrix covering on surface of steel ban, interval of the steel bar, diameter and surface character of steel bar, and the efficient embedding Length of steel bar is in the range of 10d~15d (d-diameter) of steel bar in most case.更多还原