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NB/T 11535-2024Test method of rebound rate of shotcrete (English PDF)

喷射混凝土回弹率测定试验方法

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

May 24, 2024

Implementation date

November 24, 2024

Scope

NB/T 11535-2024 is the English-translated version of 喷射混凝土回弹率测定试验方法.

NB/T 11535-2024 sets the Chinese energy industry test for measuring how much shotcrete bounces off the surface during spraying. It defines rebound material, the rebound rate as a mass ratio, the sheet laid to collect the rebound, and separate rebound from the side walls and from the roof of a tunnel.

The document covers the test principle, basic requirements, instruments, test steps, data processing and the test report, with an informative rebound test record form.

It applies to cement concrete sprayed during shotcrete construction, where the rebound and the material bonded to the wall are weighed to obtain the rate. Issued on 24 May 2024, it has applied since 24 November 2024.

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Document preview — NB/T 11535-2024

National Standard of the People's Republic of China

ICS: 13.030
Classification: D 09

Issued by: National Energy Administration of the People's Republic of China

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

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 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 material

During the concrete spraying process, the splashed materials that are ejected through the nozzle and not bonded to the sprayed wall surface.

3.2 Rebound rate

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 Rebound collection sheet

A non-absorbent plastic film or tarp used to collect rebound material.

3.4 Side wall rebound

Material rebound caused by concrete spraying on both sides of the tunnel.

3.5 Roof rebound

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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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

Normative references

GB 50086Technical code for engineering of ground anchorages and shotcrete support

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