使用水泥材料对现有混凝土结构进行结构干预 第 2 部分：顶面覆盖

[中文适用范围]： 本文件规定了使用顶面覆盖法进行设计和施工的标准，该方法通过将胶凝材料整合到构件的顶面上来增加现有混凝土构件的厚度，从而提高混凝土结构的安全性、适用性、耐久性和其他性能。本文件规定了使用胶凝材料设计和实施原则对现有混凝土结构进行结构干预，以及针对缺陷和持续劣化的策略，包括但不限于：a)机械作用，例如疲劳、冲击、超载、沉降引起的移动、爆炸、振动和地震作用；b)环境的化学和生物作用，例如硫酸盐侵蚀、碱骨料反应；c)物理作用，例如冻融、热开裂、水分移动、盐结晶、火灾和侵蚀；d)钢筋腐蚀；e)自施工时起未解决的原始施工缺陷。 [外文原描述]： This document specifies the standards for design and construction using the top-surface overlaying method, which increases the thickness of existing concrete members by integrating cementitious materials onto the top surface of the members so as to improve the safety, serviceability, durability and other properties of a concrete structure. This document specifies structural intervention of existing concrete structures using cementitious materials design and execution principles, and strategies for defects and on-going deterioration including, but not limited to: a) mechanical actions, e.g. fatigue, impact, overloading, movement caused by settlement, blast, vibration, and seismic actions; b) chemical and biological actions from environments, e.g. sulfate attack, alkali-aggregate reaction; c) physical actions, e.g. freeze–thaw, thermal cracking, moisture movement, salt crystallization, fire, and erosion; d) reinforcement corrosion; e) original construction defects that remained unaddressed from the time of construction.