NB/T 11535-2024 English PDF

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NB/T 11535-2024: Test method of rebound rate of shotcrete
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Basic data

Standard ID: NB/T 11535-2024 (NB/T11535-2024)
Description (Translated English): Test method of rebound rate of shotcrete
Sector / Industry: Energy Industry Standard (Recommended)
Classification of Chinese Standard: D09
Classification of International Standard: 13.030
Word Count Estimation: 11,155
Date of Issue: 2024-05-24
Date of Implementation: 2024-11-24
Issuing agency(ies): National Energy Administration

NB/T 11535-2024: Test method of rebound rate of shotcrete

---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.
ICS 13.030 CCSD09 Energy Industry Standards of the People's Republic of China Test method for determination of rebound rate of shotcrete Released on 2024-05-24 Implementation on November 24, 2024 The National Energy Administration released

Table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test Principle 1 5 Basic Requirements 2 6 Instruments 2 7 Test Step 3 8 Data Processing 5 9 Test Report 5 Appendix A (Informative) Rebound Test Record Report 6

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. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Coal Industry Association. This document is under the jurisdiction of the Coal Industry Coal Mine Safety Standardization Technical Committee. This document was drafted by. Shandong University of Science and Technology, China Coal Technology and Engineering Group Chongqing Research Institute Co., Ltd., Qingdao University of Technology, Shandong Energy Group Co., Ltd., Shandong Yanbotech Electromechanical Technology Co., Ltd., Shandong Weitlipang Mining Equipment Co., Ltd., Shandong Yaruite Electromechanical Engineering Co., Ltd. Technology Co., Ltd., China Coal Technology and Engineering Group Nanjing Design and Research Institute Co., Ltd. The main drafters of this document are. Chen Lianjun, Pan Gang, Sui Jinjun, Cheng Weimin, Liu Guoming, Wang Naiguo, Zhang Shaobo, Liu Zhaoxia, Cui Xiangfei, Li Pengcheng, Zhou Zhi, Fan Jianguo, Sun Zhenjiao, Shi Zhiwei, Sun Jiahao, Jia Wenfeng. Test method for determination of rebound rate of shotcrete

1 Scope

This document specifies the test principle, basic requirements, instruments, test procedures, data processing and test methods for the determination of the rebound rate of shotcrete. Report. This document is applicable to the determination of the rebound rate of cement concrete during shotcrete construction.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB 50086 Technical specification for rock and soil anchor bolts and shotcrete support engineering

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Rebound materials reboundmaterials During the concrete spraying process, the splashed materials that are ejected through the nozzle and not bonded to the sprayed wall surface. 3.2 The mass ratio of the rebound material to the total mass of the bonding material and the rebound material on the sprayed wall. 3.3 A non-absorbent plastic film or tarp used to collect rebound material. 3.4 Material rebound caused by concrete spraying on both sides of the tunnel. 3.5 Material rebound caused by concrete spraying at the top of the tunnel.

4 Test Principle

Using the shotcrete construction process, the rebound material mass Wt, the bonded material mass Ws on the sprayed wall and the rebound material mass Wt are obtained. ......

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