GB/T 29417-2012 English PDF

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GB/T 29417-2012: Standard test methods for drying shrinkage stress and cracking possibility of cement mortar and concrete
Status: Valid

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Basic data

Standard ID: GB/T 29417-2012 (GB/T29417-2012)
Description (Translated English): Standard test methods for drying shrinkage stress and cracking possibility of cement mortar and concrete
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q12
Classification of International Standard: 91.100.30
Word Count Estimation: 9,949
Quoted Standard: GB/T 17671; GB/T 50081; GB/T 50082
Regulation (derived from): National Standards Bulletin 2012 No. 42
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the cement mortar, concrete drying shrinkage stress and cracking resistance test methods. This standard applies to calculate the Laboratory drying shrinkage due to stress-induced cracking of cement mortar and concrete performance r

GB/T 29417-2012: Standard test methods for drying shrinkage stress and cracking possibility of cement mortar and concrete

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
dard test methods for drying shrinkage stress and cracking possibility of cement mortar and concrete ICS 91.100.30 Q12 National Standards of People's Republic of China Cement and concrete drying shrinkage Cracking Resistance Test Method Issued on. 2012-12-31 2013-08-01 implementation Quality Supervision and Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard proposed by China Building Materials Federation. This standard by the National Standardization Technical Committee cement products (SAC/TC197) centralized. This standard is drafted by. China Building Materials Academy, fourteen Yunnan Metallurgical Construction Group Third Construction Company Limited. Participated in the drafting of this standard. Shandong Academy of Building Research, Chongqing University, Tianjin leopard Ming Co., Ltd., Chongqing Trinity special construction Materials Co., Ltd., the country Chang Holdings Limited, chief industry Construction Group Co., Ltd., Jiangsu Bot New Materials Co., Ltd., Shenzhen, Lu Based Building Materials Technology Co., Ltd., Wuhan three sources of special building materials limited liability company, Ltd. Xiamen Yi Siou standard sand. The main drafters of this standard. Zhaoshun increase, Liu, Xie golden, Wang Yongwei, Yang Changhui, Liu Fu-wide, Jiang Lizhen, Li Guangming, Tan Fengguo, Shenjian Hai Tian Qian, Dong Gang with, Wucui E, Jiafu Jie, Li Changcheng, Wu Xunan. Cement and concrete drying shrinkage Cracking Resistance Test Method

1 Scope

This standard specifies the cement mortar, concrete drying shrinkage and stress cracking resistance test methods. This standard applies to the determination of the laboratory result calculated by drying shrinkage stress cracking cement mortar and concrete reference index.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 17671 cement mortar strength test method (ISO method) GB/T 50081 mechanical properties of ordinary concrete test method standards GB/T 50082 ordinary concrete long-term performance and durability test method standards

3 PRINCIPLE OF THE METHOD

The method is to use longer than the measured length to limit the amount of change in the pouring cement mortar or concrete Specimen expansion and contraction means. According to the principle of action and reaction are equal, and the amount of change in terms of length measurement of drying shrinkage of cement mortar or concrete should Strength, splitting tensile strength ratio of the percentage of its drying shrinkage stress using a predetermined period represented age cracking index.

4 Terms and Definitions

The following terms and definitions apply to this document. 4.1 Drying shrinkage stress dryingshrinkagestress Cement mortar or concrete due to drying shrinkage tensile stress generated under constraints. 4.2 Expansion stress expansionstress Cement mortar or concrete compressive stress due to volume expansion produced under constraints. 4.3 Cracking Index (dryingshrinkage) crackingindex Characterization of the possibility of cracking in the cement mortar or concrete drying shrinkage conditions, drying shrinkage stress in the same test age and Splitting Tensile strength ratio expressed as a percentage.

5 Equipment

5.1 tryout Cement drying shrinkage stress test body and splitting tensile strength test specimen are used prism triple test mode, test mode for the cross-sectional dimension ......

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