内源氯盐混凝土建筑耐久性寿命预测  

Prediction of Durability Life for Chloride-admixed Concrete Structures

作　　者：余立智 YU Li-zhi(WISDRI Wuhan Architecture Design Co,Ltd,Wuhan 430077,China)

机构地区：[1]中冶南方武汉建筑设计有限公司,武汉430077

出　　处：《建材世界》2024年第6期106-110,115,共6页The World of Building Materials

摘　　要：目前环境因素对钢筋混凝土结构耐久性的影响主要为碳化作用和氯盐侵蚀,其中氯盐侵蚀的影响机制更为复杂,需要进一步完善量化的评定方法,为混凝土结构的后期运维提供决策依据。我国有三项国家标准和一项行业标准可指导含氯盐混凝土构件耐久性评定,但均有适用性范围,应用经验还比较有限。为满足工程应用需要,分析了当前技术标准的逻辑关系。遵循现行标准,依据钢筋破损检测锈蚀情况和碳化深度初步判断锈蚀机制。综合运用标准规则,按大气温湿度修正混凝土电阻率、钢筋锈蚀电流密度关键参数,细化评估模式。依托某沿海城市工程案例,对结构进行系统检测,对氯离子和碳化共同作用下锈蚀模式进行探讨,按建议框架分析混凝土构件的锈胀开裂年限和耐久性裕度,表明了分析模式的有效性。At present,the influence of environmental factors on the durability of reinforced concrete structures is mainly carbonation and chloride salt erosion.Among them,the influence mechanism of chloride salt erosion is more complex,and a quantified evaluation method needs to be further improved to provide a decision-making basis for the later operation and maintenance of concrete structures.Currently,there are three state standards and one industry standard available to guide the durability assessment of concrete components containing chloride salts,but all of them have application scopes and relatively limited application experience.To meet the needs of engineering applications,the logical relationship of current technical standards was analyzed.Following the current standards,the corrosion mechanism was preliminarily judged based on the detection of steel bar damage and corrosion conditions and the carbonization depth.The key parameters of concrete resistivity and steel bar corrosion current density were corrected in accordance with the atmospheric temperature and humidity by comprehensively applying the standard rules,and the assessment mode was refined.Relying on an engineering case in a coastal city,a systematic inspection of the structure was carried out,and the corrosion mode under the combined action of chloride ions and carbonization was discussed.The rust expansion cracking years and durability margin of concrete components were analyzed according to the proposed framework,demonstrating the effectiveness of the analysis mode.

关 键 词：氯盐侵蚀 碳化 耐久性评定 锈胀开裂 

分 类 号：TU973.1[建筑科学—结构工程] TU528