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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19766-2005 Specification for natural marble for building slab. In addition to a number of editorial changes, the following main technical changes have been made with respect to GB/T 19766-2005:
——The term “abrasion resistance” is deleted and those standard terms listed in GB/T 13890 and JC/T 202 are cited and apply to this standard (see Clause 3; Clause 3 of Edition 2005);
——The categories of marble stones and requirements for their corresponding physical property indexes are refined (see 4.1.1 and 6.3; 5.6.2 of Edition 2005);
——Product classification, technical requirements and inspection methods for original gloss bat slabs are added (see 4.1.2, 6.1.1, 7.1.1 and 7.1.2);
——Product classification for irregular slabs and requirements for their processing quality are added (see 4.1.2 and 6.1.11);
——Classification for surface working and requirements for the flatness, straightness and line profile of roughing slabs are added (see 4.1.3, 6.1.4 and 6.1.5; 5.1.3 and 5.1.4 of Edition 2005);
——The grade names are modified (see 4.2; 4.2 of Edition 2005);
——The rule for naming stone is modified, i.e. stone is named by its name given in relevant standard or by its number (see 4.3.1; 4.3.1 of Edition 2005);
——General requirements are added, including the recommended size for normal slabs and requirements for back net glue and stone protective agent (see Clause 5);
——The thickness requirements for dry hanging slabs are deleted (see 6.1.2; 5.2.1 of Edition 2005);
——The requirements for measurement accuracy of flatness and straightness are modified (see 7.1.5 and 7.1.6; 6.2.1 and 6.2.2.1 of Edition 2005);
——Method for petrographic analysis of stone is added (see 7.3.1);
——Methods for testing bulk density, water absorption and compressive strength under special conditions are added (see 7.3.2 and 7.3.3);
——The Annex with respect to abrasion resistance test method is deleted and those specified in standard with respect to test methods for stones are adopted (see 7.3.5; 6.5.5 of Edition 2005).
This standard was proposed by China Building Materials Federation.
This standard is under the jurisdiction of SAC/TC 460 the National Technical Committee on Stone of Standardization Administration of China.
Building slab of natural marble
1 Scope
This standard specifies the terms and definitions, classifications, grades and marks, material requirements, technical requirements, measurement methods, inspection rules as well as marking, packaging, transport and storage of natural marble building slabs (hereinafter referred to as slabs).
This standard is applicable to natural marble slabs for architectural ornament. It may also serve as a reference for natural marble slabs used for other purposes.
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 document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 9966.1 Test methods for natural facing stones - Part 1: Dry, wet and after freezing test methods for compressive strength
GB/T 9966.2 Test methods for natural stone - Part 2: Determination of dry, wet and after freezing flexural strength
GB/T 9966.3 Test methods for natural facing stones - Part 3: Test methods for bulk density, true density, true porosity and water absorption
GB/T 9966.4 Test methods for natural facing stones - Part 4: Test method for abrasion resistance
GB/T 13890 Terms for natural stone
GB/T 13891 Test methods of specular gloss for decorative building materials
GB/T 17670 Unified catalogue for natural stone
GB/T 18601-2009 Natural granite for building slab
GB 24264 Adhesives for facing stones
GB/T 32837 Protectant for natural stone
JC/T 202 Quarry stone of natural marble
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 13890 and JC/T 202 apply.
4 Classifications, grades and marks
4.1 Classifications
4.1.1 By mineral composition, they are divided into:
a) Calcite marble (code: FL);
b) Dolomite marble (code: BL);
c) Serpentine marble (code: SL).
4.1.2 By shape, they are divided into:
a) Original gloss bat slab (code: MG);
b) Normal slab (code: PX);
c) Arc slab (code: HM);
d) Irregular slab (code: YX).
4.1.3 By surface working, they are divided into:
a) Polished slab (code: JM);
b) Roughing slab (code: CM).
4.2 Grades
They are divided into Grades A, B and C based on the processing quality and appearance quality.
4.3 Marks
4.3.1 Name: Use the name or number specified in GB/T 17670.
4.3.2 Sequence: name, category, specification/dimension, grade and standard number.
4.3.3 Examples:
Grade A normal polished slab processed with Fangshan Hanbaiyu quarry marble stone, with a dimension of 600mm×600mm×20mm, is marked as follow:
Mark: Fangshan Hanbaiyu marble (or M1101) BL PX JM 600×600×20 A GB/T 19766-2016.
5 Material requirements
5.1 See Table 1 for the full dimension range of normal slab. And the specification/dimension of arc slab, irregular slab and normal slab with special requirements shall be determined by both the supplier and the demander through negotiation.
Table 1 Full dimension range of normal slab In: mm
Full dimension range of side length 300a, 305a, 400, 500, 600a, 700, 800, 900, 1,000, 1,200
Full dimension range of thickness 10a, 12, 15, 18, 20a, 25, 30, 35, 40, 50
a Refer to common specification.
5.2 Slabs poor in ruggedness shall be reinforced with back nets. And adhesives for back nets shall be those for facing stones, and their performances shall meet the requirements of GB 24264, in addition, measures to enhance cohesiveness shall be taken.
5.3 The slab surface shall be treated with suitable protective agent, which shall meet the requirements of GB/T 32837.
6 Technical requirements
6.1 Processing quality
6.1.1 Flatness tolerance and thickness deviation of original gloss bat slab shall meet the requirements of Table 2.
Table 2 Requirements for flatness and thickness of original gloss bat slab In: mm
Item Technical index
A B C
Flatness 0.8 1.0 1.5
Thickness ≤12 ±0.5 ±0.8 ±1.0
>12 ±1.0 ±1.5 ±2.0
6.1.2 The permissible deviation of specification and dimension of the normal slab shall meet those specified in Table 3.
6.1.3 The minimum wall thickness of the arc slab shall not be less than 20mm, and see Table 4 for the permissible deviation of specification and dimension of the arc slab. The names of different parts of the arc slab are shown in Figure 1.
6.1.4 See Table 5 for allowable tolerances for flatness of normal slabs.
6.1.5 See Table 6 for allowable tolerances for straightness and line profile of arc slabs.
6.1.6 See Table 7 for allowable tolerances of angle of normal slabs.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classifications, grades and marks
5 Material requirements
6 Technical requirements
7 Measurement method
8 Inspection rules
9 Marking, packaging, transport and storage
Bibliography
