GB/T 28990-2012 in English

《GB/T 28990-2012古建筑木构件内部腐朽与弹性模量应力波无损检测规程》由TC41（全国木材标准化技术委员会）归口，TC41SC1（全国木材标准化技术委员会基础标准分会）执行，主管部门为国家林业和草原局。

Test methods of steel for reinforcement of concrete

1 Scope

This standard specifies the test methods of steel for reinforced concrete, covering tensile test, bending test, rebending test, axial fatigue test, chemical analysis, geometric dimension measurement, determination of specific projected rib area, determination of mass deviation and metallographic examination of steel bar.

This standard is applicable to steel bar products for reinforced concrete.

This standard is not applicable to prestressed steel.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.

GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1:2009, MOD)
GB/T 232-2010 Metallic materials - Bend test (ISO 7438:2005, MOD)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 12160 Calibration of extensometers used in uniaxial testing (GB/T 12160-2002, ISO 9513:1999, IDT)
GB/T 13298 Inspection methods of microstructure for metals
GB/T 16825.1 Verification of static uniaxial testing machines - Part 1: Tension/ compression testing machines - Verification and calibration of the force measuring system (GB/T 16825.1-2008, ISO 7500-1:2004, IDT)

3 Symbols

The symbols used in this standard are shown in Table 1.

Foreword i
1 Scope
2 Normative references
3 Symbols
4 General provisions concerning specimens
4.1 Preparation
4.2 Straightening
4.3 Artificial aging
5 Tensile test
5.1 Specimen
5.2 Apparatus
5.3 Test procedure
6 Bend test
6.1 Specimen
6.2 Test apparatus
6.3 Test procedure
6.4 Judgment of test results
7 Rebend test
7.1 Specimen
7.2 Test apparatus
7.3 Test procedure
7.4 Judgment of test results
8 Axial force fatigue test
8.1 Principle of test
8.2 Specimen
8.3 Test apparatus
8.4 Test procedure
9 Chemical analysis
10 Measurement of the geometrical characteristics
10.1 Specimen
10.2 Test apparatus
10.3 Test procedure
11 Determination of the specific projected rib area (fR)
11.1 Introduction
11.2 Measurements
11.3 Calculation of fR
12 Determination of mass deviation
12.1 Specimen
12.2 Accuracy of measurement
12.3 Test procedure
13 Metallographic examination of steel bar
13.1 Specimen
13.2 Test procedure
Annex A (Informative) Technical differences between this standard and ISO 15630-1: 2010 and their causes