Technical specification for corrosion monitoring and testing of steel reinforced concrete
1 Scope
This document specifies the composition, test point distribution, installation, commissioning, acceptance, and operation of the corrosion monitoring and testing system for steel reinforced concrete (hereinafter referred to as the "monitoring and testing system"), and describes the corrosion evaluation methods for steel reinforced concrete.
This document is applicable to the corrosion monitoring and testing, corrosion evaluation, and engineering acceptance of steel reinforcement in steel reinforced concrete structures. It can be used for steel reinforced concrete structures without cathodic protection and those with cathodic protection.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 7665 General terminology for transducers
GB/T 10123 Corrosion of metals and alloys - Vocabulary
GB/T 38894-2020 Non-destructive testing - Electrochemical testing - General principles
GB 50168 Standard for construction and acceptance of cable line - Electric equipment installation engineering
GB/T 50344-2019 Technical standard for inspection of building structure
JGJ/T 152 Technical standard for test of reinforcing steel bar in concrete
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 7665, GB/T 10123 and GB/T 33373 as well as the following apply.
3.1
corrosion of steel reinforced concrete
degradation process of steel reinforcement in concrete structures under environmental action
3.2
self-corrosion potential of steel reinforcement
mixed potential of corrosion cell of steel reinforcement in concrete under the condition of no applied current polarization
3.3
corrosion rate of steel reinforcement
amount of corrosion per unit area and per unit time of steel reinforcement in concrete
Note: The corrosion rate of steel reinforcement can be expressed in the following three forms:
a) Loss in mass of steel reinforcement per unit area and per unit time;
b) Diameter thinning of steel reinforcement per unit area and per unit time;
c) Corrosion current per unit area and per unit time.
3.4
protection potential
electrode potential of steel reinforcement subjected to cathodic polarization after cathodic protection is applied to steel reinforced concrete
3.5
test area
one or more test areas on a structure or member to be arranged in a key or representative area according to the requirements of the testing method
3.6
test point
one or more sensor points buried in a key or representative location within a test area according to the requirements of the testing method
4 General requirements
4.1 Procedures and contents for monitoring and testing
4.1.1 The flow chart of the procedure for corrosion monitoring and testing of steel reinforced concrete is shown in Figure 1.
Contents Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 System 6 Test point distribution 7 Installation 8 Commissioning 9 Acceptance 10 Operation 11 Corrosion evaluation of steel reinforced concrete Annex A (Informative) Construction acceptance record of monitoring and testing system for steel reinforced concrete Bibliography
GB/T 7665、GB/T 10123和GB/T 33373界定的以及下列术语和定义适用于本文件。 3.1 钢筋混凝土腐蚀 corrosion of steel reinforced concrete 在环境作用下，混凝土结构中钢筋发生退化的过程。 3.2 钢筋自腐蚀电位 self-corrosion potential of steel reinforcement 在无外加电流极化条件下，钢筋在混凝土中腐蚀电池的混合电位。 3.3 钢筋腐蚀速率 corrosion rate of steel reinforcement 混凝土中钢筋单位面积、单位时间内腐蚀的量。 注：钢筋腐蚀速率有三种表示方法： a) 单位面积、单位时间内钢筋损失的质量； b) 单位面积、单位时间内钢筋直径减薄量； c) 单位而积、单位时间内的腐蚀电流。 3.4 保护电位 protection potential 对钢筋混凝土施加阴极保护后，钢筋受阴极极化的电极电位。 3.5 测试区 test area 在一个结构或构件上，按检测方法要求，选择在重点或代表性区域布置的一个或者若干个检测区域。 3.6 测试点 test point 在一个测区内，按检测方法要求，选择在重点或代表性位置埋设一个或者若干个传感器的点位。
