GB/T 2997-2015 in English

《GB/T 2997-2015致密定形耐火制品体积密度、显气孔率和真气孔率试验方法》由TC193（全国耐火材料标准化技术委员会）归口，TC193SC3（全国耐火材料标准化技术委员会试验方法分会）执行，主管部门为国家标准化管理委员会。
本标准规定了致密定形耐火制品体积密度、显气孔率和真气孔率测定的术语和定义、原理、设备和材料、试样、试验步骤、结果计算、试验误差及试验报告。
本标准适用于致密定形耐火制品体积密度、显气孔率和真气孔率的测定。

1 Scope

This standard specifies the terms and definitions, principles, apparatus and materials, test piece, test steps, result calculation, test error and test report for the determination of the bulk density, apparent porosity and true porosity of dense shaped refractory products.

This standard is applicable to the determination of the bulk density, apparent porosity and true porosity of dense shaped refractory products.

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 (including any amendments) applies.

GB/T 5071 Refractory materials - Determination of true density (GB/T 5071-2013, ISO 5018:1983, MOD)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10325 Shaped refractory products - Rule of acceptance, sampling and inspection (GB/T 10325-2012, ISO 5022:1979, NEQ)
GB/T 22230 Liquid chemical products for industrial use - Determination of density at 20℃ (GB/T 22230-2008, ISO 758:1976, IDT)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1
bulk density
ρb
ratio of the mass of the dry material of a porous body to its bulk volume

 
3.2
bulk volume
Vb
sum of the volumes of the solid material, the open pores and the closed pores in a porous body

Note: The roughness of the surface limits the accuracy of definition of the bulk volume and consequently, that of the bulk density. Also, the concept of bulk density becomes less precise when the volume of the sample diminishes below certain limits or when its texture (size of pores and grains) is too coarse.

3.3
true density
ρt
ratio of the mass of the dry material of a porous body to its true volume

3.4
true volume
volume of the solid material in a porous body

Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatuses and materials
6 Test pieces
7 Test procedure
8 Result calculation
9 Test error
10 Test report
Annex A (Informative) Comparison of the numbering of clauses in this standard with that in ISO 5017:2013
Annex B (Informative) Technical differences and their causes between this standard and ISO 5017:2013