百年服役后的混凝土宏观和微观性能  

Macro-and Micro-Properties of Concrete for Century-Long Service

作　　者：韩建国[1] 廉慧珍[1] 郭保林 HAN Jianguo;LIAN Huizhen;GUO Baolin(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Transportation Research Institute of Shandong Province,Jinan 250100,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]山东省交通科学研究院,济南250100

出　　处：《硅酸盐学报》2025年第1期16-26,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51678343);清华大学国强研究院项目(2022GQC0007)。

摘　　要：硅酸盐水泥长龄期服役能力研究,对于水泥矿物组成控制、混凝土配合比设计、建筑结构运维均具有重要的指导价值。对1916年建造于南京的国内首批钢筋混凝土建筑“和记洋行”的钢筋混凝土梁进行钻芯取样。对提取的混凝土芯样进行力学性能、抗渗透性能、微观形貌、化学组成、矿物组成、热稳定性能等测试,并进行了混凝土配合比的反解析,旨在探究由硅酸盐水泥制备的混凝土经历百年服役后,其宏观和微观性能现状以及混凝土性能的演变规律。结果表明:虽然和记洋行建造时所用混凝土的水灰比较大,但经历百年的服役历程后,混凝土的力学性能和抗渗透性能良好。混凝土水化产物中,除含有常规的C-S-H凝胶、CH晶体、AFt晶体、AFm晶体之外,还含有大量的碳酸钙晶体(包括方解石、文石、球霰石3种类型),说明混凝土在服役历程中逐渐被碳化。经历百年服役历程后,混凝土中依然含有未水化的Belite熟料矿物(水化度为69.4%),为混凝土强度的持续提升提供了物质基础,也说明由硅酸盐水泥制备的混凝土具有超百年的服役能力。Introduction A long-term service capacity of Portland cement is important for cement mineral composition manipulating,concrete mix proportion design,and building maintenance.In 2017,beam cores were sampled on the Hugee building as one of the first reinforced concrete structures in China built in 1916.Macro-and micro-properties of concrete core samples were tested,i.e.,mechanical properties,anti-permeability properties,microscopic morphology,chemical composition,mineral composition and thermal stability properties.Meanwhile,concrete mix proportion parameters were disclosed by a reverse analyze method.In this paper,the macro-and micro-properties of concrete after a century of service and the evolution law of concrete properties were investigated.The results show that although the water-cement ratio of the concrete used in the construction of the Hugee building is relatively large,the mechanical properties and anti-permeability properties of the concrete are satisfying after a century of service.In addition to conventional C-S-H gel,CH crystals,AFt crystals,and AFm crystals,the concrete hydration products also contain a large amount of calcium carbonate crystals(i.e.,calcite,aragonite and vaterite),indicating that the concrete is gradually carbonized during its service.The results of SEM and quantitative XRD analysis show that after a century of service,the concrete still contains unhydrated Belite clinker minerals(hydration degree of 69.4%),which provides a material basis for the continuous improvement of concrete strength,showing that concrete prepared with Portland cement has a service capacity of more than 100 years.Methods Chemical composition,mineral composition,microscopic morphology,mechanical properties,anti-penetration ability of century-long service Hugee building concrete were systematically measured.Especially,the mix proportion of Hugee concrete was analyzed by a reverse analysis method in the absence of historical records of the material and mix proportion for the Hugee concrete.Core specimen obtained

关 键 词：硅酸盐水泥 混凝土 百年服役 力学性能 抗渗透性能 微观性能 

分 类 号：TU528.44[建筑科学—建筑技术科学]