GB/T 42272-2022The method for determining the chloride diffusion coefficient for cement mortar (English PDF)
水泥胶砂氯离子扩散系数检测方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 30, 2022
Implementation date
April 1, 2023
Scope
GB/T 42272-2022 is the English-translated version of 水泥胶砂氯离子扩散系数检测方法.
GB/T 42272-2022 is the Chinese national test method for the chloride ion diffusion coefficient of cement mortar. It covers the equipment and materials, the laboratory conditions, the forming and curing of the specimens, the measurement itself, the treatment of the results, the detection tolerance and the performance evaluation.
Specimens are made at a fixed lime-sand and water-cement ratio, cured for 28 days, held under negative pressure in vacuum salt-saturation equipment, soaked in sodium chloride solution for 18 hours and dried, after which their conductivity is measured and the coefficient calculated from the Nernst-Einstein equation.
Clause 1 applies it to general Portland cement, marine Portland cement and the other cements the document specifies. It quotes GB 175, GB/T 17671 and the JC/T standards for the mixer, vibrating table and moulds. Issued on 30 December 2022, applicable since 1 April 2023.
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Document preview — GB/T 42272-2022
National Standard of the People's Republic of China
- ICS
- 91.100.10
- Classification
- Q 11
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Summary of method
- 5 Instruments and equipment
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.
1 Scope
This document specifies the equipment, materials, laboratory conditions, test body forming, and test body cultivation of the test method for the chloride ion diffusion coefficient of cement mortar.
Protection, chloride ion diffusion coefficient detection, test results and processing, detection tolerance and performance evaluation.
This document is applicable to general Portland cement, marine Portland cement and other cements specified in this document.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references Only the version corresponding to that date applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB 175 General Portland cement
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 17671 Test method for cement mortar strength (ISO method)
JC/T 681 planetary cement mortar mixer
JC/T 723 cement mortar vibrating table
JC/T 726 cement mortar test mold
3 Terms and Definitions
This document does not have terms and definitions that need to be defined.
4 Summary of method
The cement mortar test body formed according to the fixed lime-sand ratio and water-cement ratio and cured for 28 days was left to stand under the negative pressure condition of vacuum saturated salt equipment for a period of time.
After a certain time, soak in a certain concentration of sodium chloride (NaCl) solution for 18 hours. After drying the specimen, the conductivity of the specimen was detected, based on The chloride ion diffusion coefficient of cement mortar was calculated by Nernst-Einstein equation.
5 Instruments and equipment
5.1 Cement Mortar Mixer
Should comply with the provisions of JC/T 681.
5.2 Cement mortar vibrating table
Should comply with the provisions of JC/T 723.
5.3 Die trial
The test mold consists of partitions, end plates, bottom plates, fastening devices and positioning pins, as shown in Figure 1. Trial mold can form 3 strips of 100mm× at the same time
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 175-2023 — Common portland cement
GB 17501-1998 — Specification for marine engineering topographic surveying
GB 17509-2008 — Photometric characteristics of direction indicators for motor vehicles and their trailers
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GB/T 42272-2022
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