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 33373 Anticorrision - Electrochemical protection - Terminology
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
鋼筋混凝土腐蝕監檢測技術規范
1 范圍
本文件規定了鋼筋混凝土腐蝕監檢測系統(以下簡稱“監檢測系統”)的組成、測試點布設、安裝、調試、驗收、運行，描述了鋼筋混凝土腐蝕的評價方法。
本文件適用于鋼筋混凝土結構鋼筋腐蝕的監檢測、腐蝕評價和工程驗收，可用于無陰極保護和有陰極保護的鋼筋混凝土結構。
2 規范性引用文件
下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件，僅該日期對應的版本適用于本文件；不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。
GB/T 7665 傳感器通用術語
GB/T 10123 金屬和合金的腐蝕 術語
GB/T 33373 防腐蝕 電化學保護 術語
GB/T 38894-2020 無損檢測 電化學檢測 總則
GB 50168 電氣裝置安裝工程電纜線路施工及驗收標準
GB/T 50344-2019 建筑結構檢測技術標準
JGJ/T 152 混凝土中鋼筋檢測技術標準
3 術語和定義
GB/T 7665、GB/T 10123和GB/T 33373界定的以及下列術語和定義適用于本文件。
3.1
鋼筋混凝土腐蝕 corrosion of steel reinforced concrete
在環境作用下，混凝土結構中鋼筋發生退化的過程。
3.2
鋼筋自腐蝕電位 self-corrosion potential of steel reinforcement
在無外加電流極化條件下，鋼筋在混凝土中腐蝕電池的混合電位。
3.3
鋼筋腐蝕速率 corrosion rate of steel reinforcement
混凝土中鋼筋單位面積、單位時間內腐蝕的量。
注：鋼筋腐蝕速率有三種表示方法：
a) 單位面積、單位時間內鋼筋損失的質量；
b) 單位面積、單位時間內鋼筋直徑減薄量；
c) 單位而積、單位時間內的腐蝕電流。
3.4
保護電位 protection potential
對鋼筋混凝土施加陰極保護后，鋼筋受陰極極化的電極電位。
3.5
測試區 test area
在一個結構或構件上，按檢測方法要求，選擇在重點或代表性區域布置的一個或者若干個檢測區域。
3.6
測試點 test point
在一個測區內，按檢測方法要求，選擇在重點或代表性位置埋設一個或者若干個傳感器的點位。
4 一般規定
4.1 監檢測程序和工作內容
4.1.1 鋼筋混凝土腐蝕監檢測程序流程如圖1所示。
