GB/T 24175-2026 Test method for stability of steel slag English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 24175-2026
Test method for stability of steel slag
钢渣稳定性试验方法
Issue date: 2026-03-31 Implementation date: 2026-10-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Instruments and Equipment
5 Determination of Immersion Expansion Ratio of Steel Slag
6 Determination of Autoclave Chalked Ratio of Steel Slag
7 Determination of Atmospheric Chalked Ratio of Steel Slag
8 Test Report
Test method for stability of steel slag
1 Scope
This document specifies the instruments and equipment, determination of immersion expansion ratio, determination of autoclave chalked ratio, determination of atmospheric chalked ratio and test report for the stability test method of steel slag.
This document applies to converter steel slag and electric arc furnace steel slag stability. Among them, the method for determining the immersion expansion ratio applies to steel slag used for road subgrade and base course materials, asphalt pavement aggregates, and engineering backfill; the autoclave chalked ratio method applies to steel slag used for building mortar and building materials products; the atmospheric chalked ratio method applies to steel slag used for engineering backfill.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6003.1 Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
GB/T 6003.2 Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 50123 Standard for geotechnical testing method
JC/T 955 Boiling box for cement soundness test
YB/T 804 Terminology of iron and steel slag — Processing and utilization
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in YB/T 804 and the following apply.
3.1 immersion expansion ratio
The volume change rate of a compacted steel slag specimen after continuous immersion in a specified hot water bath for 10 days.
3.2 autoclave chalked ratio
The percentage, by mass, of steel slag aggregate particles that chalk to a size smaller than 1.18 mm after autoclaving in saturated steam at 2 MPa.
3.3 atmospheric chalked ratio
The percentage, by mass, of steel slag aggregate particles that chalk after boiling in water.
4 Instruments and Equipment
4.1 Weighing equipment
Range not less than 20 kg, minimum scale division not greater than 10 g.
Range not less than 5 kg, minimum scale division not greater than 1 g.
Range not less than 0.5 kg, minimum scale division not greater than 0.01 g.
4.2 Compaction test equipment
Includes a metal cylinder with an internal diameter of 152 mm and a height of 170 mm, a collar with a height of 50 mm, a metal cylindrical pad with a diameter of 151 mm and a height of 50 mm, a base, a compaction rammer, etc. The compaction hammer has a bottom diameter of 50 mm and a total mass of 4.5 kg. The total travel of the hammer in the guide tube is 450 mm.
4.3 Perforated base plate
With brackets on both sides, the middle perforated plate is filled with 2 mm diameter holes.
4.4 Perforated top plate
148 mm in diameter, filled with 2 mm diameter holes, made of stainless steel or brass, with a threaded centre hole.
4.5 Semi circular load plates
Concentric semi circular stainless steel plates with a diameter of 150 mm, a thickness of 10 mm, a central hollow diameter of 52 mm, each weighing 1.25 kg.
4.6 Dial gauge stand and dial gauge
Dial gauge accuracy: 0.01 mm.
4.7 Constant temperature water bath
Minimum dimensions of the water bath: length 1100 mm × width 330 mm × height 350 mm, with temperature control above 90 °C.
A schematic diagram of the apparatus for determining the immersion expansion ratio is shown in Figure 1.
4.8 Oven
Capable of controlling temperature at 105 °C, with an accuracy not less than 5 °C.
4.9 Filter paper
152 mm in diameter.
4.10 Spatula
4.11 Autoclave
Design pressure: 2.5 MPa; working pressure: 2.0 MPa; working medium: saturated steam; minimum volume: 0.0085 m³.
4.12 Test sieves
Conforming to the provisions of GB/T 6003.1 and GB/T 6003.2, with sieve apertures of 31.5 mm, 26.5 mm, 19.0 mm, 16.0 mm, 13.2 mm, 9.5 mm, 4.75 mm, 2.36 mm, 1.18 mm, 0.3 mm and 0.075 mm.
4.13 Sieve shaker
Vibration frequency: 221 times/min.
4.14 Autoclave basket
Circular sieve with a 1.18 mm aperture at the bottom, with a diameter of 100 mm and a height of 90 mm, with a cloth on the sieve mesh.
4.15 Boiling box
Boiling box conforming to the requirements of JC/T 955.
4.16 Crusher
Small jaw crusher.
5 Determination of Immersion Expansion Ratio of Steel Slag
5.1 Principle
Using a water bath curing method at 80 °C, the free calcium oxide and free magnesium oxide in the steel slag are slaked over a certain period, causing volume expansion. The stability of the steel slag is evaluated by the volume change rate.
5.2 Preparation of test specimens
5.2.1 Take 100 kg of a representative sample, dry it, and crush it until it completely passes through a 31.5 mm square hole sieve for use.
5.2.2 Pass the crushed sample through square hole sieves of 31.5 mm, 26.5 mm, 13.2 mm, 4.75 mm, 2.36 mm, 0.3 mm and 0.075 mm. Place the sieve stack on a sieve shaker and vibrate for 10 min. Remove the sieve stack and, in order of decreasing sieve aperture size, hand shake each sieve individually until the amount passing through per minute is less than 0.1 % of the total sample mass. The fraction passing through is combined with the sample in the next smaller sieve, and the combined sample is sieved together. This procedure is carried out sequentially until all sieves have been completed.
5.2.3 Prepare compacted specimens using the actual project particle size distribution. If not specified, prepare the specimens according to the particle size distribution in Table 1. If the maximum natural particle size of the steel slag sample is smaller than the maximum particle size in the first column of Table 1, prepare the specimens according to the particle size distribution for the maximum particle size in the second column, and so on.
5.3 Test procedure
5.3.1 Carry out the heavy compaction test according to the compaction test method in GB/T 50123 to determine the optimum moisture content and maximum dry density.
5.3.2 Weigh three portions of steel slag, 7 kg each, according to the particle size distribution requirements of Table 1. Add water to achieve the optimum moisture content, mix thoroughly and evenly, and prepare three steel slag specimens in airtight containers.
Standard
GB/T 24175-2026 Test method for stability of steel slag (English Version)
GB/T 24175-2026 Test method for stability of steel slag English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 24175-2026
Test method for stability of steel slag
钢渣稳定性试验方法
Issue date: 2026-03-31 Implementation date: 2026-10-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Instruments and Equipment
5 Determination of Immersion Expansion Ratio of Steel Slag
6 Determination of Autoclave Chalked Ratio of Steel Slag
7 Determination of Atmospheric Chalked Ratio of Steel Slag
8 Test Report
Test method for stability of steel slag
1 Scope
This document specifies the instruments and equipment, determination of immersion expansion ratio, determination of autoclave chalked ratio, determination of atmospheric chalked ratio and test report for the stability test method of steel slag.
This document applies to converter steel slag and electric arc furnace steel slag stability. Among them, the method for determining the immersion expansion ratio applies to steel slag used for road subgrade and base course materials, asphalt pavement aggregates, and engineering backfill; the autoclave chalked ratio method applies to steel slag used for building mortar and building materials products; the atmospheric chalked ratio method applies to steel slag used for engineering backfill.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6003.1 Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
GB/T 6003.2 Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 50123 Standard for geotechnical testing method
JC/T 955 Boiling box for cement soundness test
YB/T 804 Terminology of iron and steel slag — Processing and utilization
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in YB/T 804 and the following apply.
3.1 immersion expansion ratio
The volume change rate of a compacted steel slag specimen after continuous immersion in a specified hot water bath for 10 days.
3.2 autoclave chalked ratio
The percentage, by mass, of steel slag aggregate particles that chalk to a size smaller than 1.18 mm after autoclaving in saturated steam at 2 MPa.
3.3 atmospheric chalked ratio
The percentage, by mass, of steel slag aggregate particles that chalk after boiling in water.
4 Instruments and Equipment
4.1 Weighing equipment
Range not less than 20 kg, minimum scale division not greater than 10 g.
Range not less than 5 kg, minimum scale division not greater than 1 g.
Range not less than 0.5 kg, minimum scale division not greater than 0.01 g.
4.2 Compaction test equipment
Includes a metal cylinder with an internal diameter of 152 mm and a height of 170 mm, a collar with a height of 50 mm, a metal cylindrical pad with a diameter of 151 mm and a height of 50 mm, a base, a compaction rammer, etc. The compaction hammer has a bottom diameter of 50 mm and a total mass of 4.5 kg. The total travel of the hammer in the guide tube is 450 mm.
4.3 Perforated base plate
With brackets on both sides, the middle perforated plate is filled with 2 mm diameter holes.
4.4 Perforated top plate
148 mm in diameter, filled with 2 mm diameter holes, made of stainless steel or brass, with a threaded centre hole.
4.5 Semi circular load plates
Concentric semi circular stainless steel plates with a diameter of 150 mm, a thickness of 10 mm, a central hollow diameter of 52 mm, each weighing 1.25 kg.
4.6 Dial gauge stand and dial gauge
Dial gauge accuracy: 0.01 mm.
4.7 Constant temperature water bath
Minimum dimensions of the water bath: length 1100 mm × width 330 mm × height 350 mm, with temperature control above 90 °C.
A schematic diagram of the apparatus for determining the immersion expansion ratio is shown in Figure 1.
4.8 Oven
Capable of controlling temperature at 105 °C, with an accuracy not less than 5 °C.
4.9 Filter paper
152 mm in diameter.
4.10 Spatula
4.11 Autoclave
Design pressure: 2.5 MPa; working pressure: 2.0 MPa; working medium: saturated steam; minimum volume: 0.0085 m³.
4.12 Test sieves
Conforming to the provisions of GB/T 6003.1 and GB/T 6003.2, with sieve apertures of 31.5 mm, 26.5 mm, 19.0 mm, 16.0 mm, 13.2 mm, 9.5 mm, 4.75 mm, 2.36 mm, 1.18 mm, 0.3 mm and 0.075 mm.
4.13 Sieve shaker
Vibration frequency: 221 times/min.
4.14 Autoclave basket
Circular sieve with a 1.18 mm aperture at the bottom, with a diameter of 100 mm and a height of 90 mm, with a cloth on the sieve mesh.
4.15 Boiling box
Boiling box conforming to the requirements of JC/T 955.
4.16 Crusher
Small jaw crusher.
5 Determination of Immersion Expansion Ratio of Steel Slag
5.1 Principle
Using a water bath curing method at 80 °C, the free calcium oxide and free magnesium oxide in the steel slag are slaked over a certain period, causing volume expansion. The stability of the steel slag is evaluated by the volume change rate.
5.2 Preparation of test specimens
5.2.1 Take 100 kg of a representative sample, dry it, and crush it until it completely passes through a 31.5 mm square hole sieve for use.
5.2.2 Pass the crushed sample through square hole sieves of 31.5 mm, 26.5 mm, 13.2 mm, 4.75 mm, 2.36 mm, 0.3 mm and 0.075 mm. Place the sieve stack on a sieve shaker and vibrate for 10 min. Remove the sieve stack and, in order of decreasing sieve aperture size, hand shake each sieve individually until the amount passing through per minute is less than 0.1 % of the total sample mass. The fraction passing through is combined with the sample in the next smaller sieve, and the combined sample is sieved together. This procedure is carried out sequentially until all sieves have been completed.
5.2.3 Prepare compacted specimens using the actual project particle size distribution. If not specified, prepare the specimens according to the particle size distribution in Table 1. If the maximum natural particle size of the steel slag sample is smaller than the maximum particle size in the first column of Table 1, prepare the specimens according to the particle size distribution for the maximum particle size in the second column, and so on.
5.3 Test procedure
5.3.1 Carry out the heavy compaction test according to the compaction test method in GB/T 50123 to determine the optimum moisture content and maximum dry density.
5.3.2 Weigh three portions of steel slag, 7 kg each, according to the particle size distribution requirements of Table 1. Add water to achieve the optimum moisture content, mix thoroughly and evenly, and prepare three steel slag specimens in airtight containers.
