Standard No.:	GB/T 2997-2015
English Name:	Test method for bulk density, apparent porosity and true porosity of dense shaped refractory products
Chinese Name:	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
Chinese Classification:	Q40    Fireproof material in general
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ;SAC
Issued on:	2015-12-10
Implemented on:	2017-1-1
Status:	valid
Superseding:	GB/T 2997-2000 Test Method for Bulk Density, Apparent Porosity and True Porosity of Dense Shaped Refractory Products
Target Language:	English
File Format:	PDF
Word Count:	5500 words
Translation Price(USD):	100.0
Delivery:	via email in 1 business day

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