GB/T 42277-2022Test method for carbonation of cement mortar (English PDF)

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 principle, test conditions, instruments and equipment, test materials, test procedures and data of the cement mortar carbonation test method. deal with.

This document is applicable to the determination of the degree of carbonization of cement mortar specimens in a certain concentration of carbon dioxide gas medium.

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 For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 6052 Industrial Liquid Carbon Dioxide

GB/T 17671 Test method for cement mortar strength (ISO method)

GB/T 50082 Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete

JC/T 724 cement mortar electric flexural testing machine

JG/T 247 Concrete Carbonation Test Chamber

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Principles

After the hardened cement mortar specimens were subjected to the carbonization of carbon dioxide, the alkalinity in the carbonized area decreased and tended to be neutral.

The neutral and alkaline interface of the test piece section is used to measure the carbonation zone depth of the cement mortar test piece subjected to the action of carbon dioxide, so as to characterize the carbon resistance of the cement Chemical.

5 Test conditions

5.1 The environmental conditions of the laboratory for the preparation of cement mortar test pieces shall comply with the provisions of GB/T 17671.

5.2 The temperature of the carbonization test room is controlled at 15°C~30°C, and the relative humidity is within (60±15)%.

6 Instruments and equipment