使用水泥材料对现有混凝土结构进行结构干预 第 3 部分：底面（拱腹）底层

[中文适用范围]： 本文件规定了采用底面（拱腹）垫层方法的设计和施工标准。底面（拱腹）垫层是一种将增强材料放置在性能低于要求的板或梁底面上的方法，通过增强材料和现有构件之间的完整性来提高构件的耐久性、使用性、安全性和其他性能。本文件规定了使用胶凝材料设计和执行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；c)物理作用，例如冻融、热开裂、水分移动、盐结晶、火灾和侵蚀；e)从施工时起未解决的原始施工缺陷。b)来自环境的化学和生物作用，例如硫酸盐侵蚀、碱骨料反应；d)钢筋腐蚀； [外文原描述]： This document specifies the standards for design and construction using the bottom-surface (soffit) underlaying method. Bottom-surface (soffit) underlaying is a method whereby reinforcing materials are placed on the bottom surface of the slabs or beams whose performance is lower than required and the improvement of durability, serviceability, safety and other performance of the members is achieved by the integrity between the reinforcing materials and existing members. 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.