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GB/T 9966.9-2021: Test methods for natural stone - Part 9: Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency
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Test methods for natural stone - Part 9: Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency
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GB/T 9966.9-2021
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Basic data | Standard ID | GB/T 9966.9-2021 (GB/T9966.9-2021) | | Description (Translated English) | Test methods for natural stone - Part 9: Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q21 | | Word Count Estimation | 10,173 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 9966.9-2021: Test methods for natural stone - Part 9: Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test methods for natural stone-Part 9.Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency
ICS 91.100.15
Q21
National Standards of People's Republic of China
Natural stone test method
Part 9.By measuring the fundamental frequency of resonance
Determination of dynamic elastic modulus
Released on 2021-05-21
2021-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
GB/T 9966 "Natural Stone Test Method" is divided into 18 parts.
---Part 1.Compressive strength test after drying, water saturation, freeze-thaw cycles;
---Part 2.Bending strength test after drying, water saturation, freeze-thaw cycles;
---Part 3.Water absorption, bulk density, true density, true porosity test;
---Part 4.Abrasion resistance test;
---Part 5.Hardness test;
---Part 6.Acid resistance test;
---Part 7.Hanging strength test of stone pendant combination unit;
---Part 8.Test method for testing the structural strength of stone hanging system with uniform static pressure difference;
---Part 9.Determine the dynamic elastic modulus by measuring the fundamental frequency of resonance;
---Part 10.Determination of the seismic performance of pendant assembly units;
---Part 11.Determination of accelerated aging strength by chilling and heating;
---Part 12.Determination of static elastic modulus;
---Part 13.Determination of Capillary Water Absorption Coefficient;
---Part 14.Determination of resistance to fracture energy;
---Part 15.Determination of resistance to salt spray aging;
---Part 16.Determination of Linear Thermal Expansion Coefficient;
---Part 17.Determination of salt crystal strength;
---Part 18.Lithofacies analysis.
This part is Part 9 of GB/T 9966.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the China Building Materials Federation.
This part is under the jurisdiction of the National Stone Standardization Technical Committee (SAC/TC460).
Drafting organizations of this section. Sinoma IOL Research Institute Co., Ltd., Beijing Sinoma IOL Research Institute Co., Ltd., China Building Materials Inspection
Certification Group Co., Ltd., Shandong Global Curtain Wall Engineering Co., Ltd., Guizhou Chenchun Stone Industry Co., Ltd.
The main drafters of this section. Zhou Junxing, Bao Yiwang, Zhong Wenbo, Qiu Yan, Zhao Haibo, Li Chenchun.
Natural stone test method
Part 9.By measuring the fundamental frequency of resonance
Determination of dynamic elastic modulus
1 Scope
This part of GB/T 9966 specifies the principles and instruments for determining the dynamic elastic modulus of natural stone by measuring the fundamental frequency of resonance.
Equipment, sample preparation, test procedures, test results and test reports.
This section applies to the determination of dynamic elastic modulus of natural stone.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 9966.3 Natural stone test method Part 3.Water absorption, bulk density, true density, true porosity test
GB/T 17670 Unified numbering of natural stone
3 Principle
The dynamic elastic modulus is calculated by measuring the fundamental frequency of natural stone resonance. There are two sample excitation methods for measuring the fundamental frequency of resonance
Formula. One is continuous excitation, the other is instantaneous excitation. Each excitation method causes the stone sample to vibrate longitudinally, and then determine the corresponding total
Vibration fundamental frequency.
4 Equipment
4.1 Continuous excitation mode equipment
4.1.1 Frequency generator with variable frequency. The minimum frequency range should be 20kHz.
4.1.2 For the transmitter and receiving sensor in contact with the sample, it is recommended to use adhesive materials (rubber, plaster, etc.) for slight fixation.
And the natural frequency of the receiver should be more than twice the fundamental frequency of the predicted sample resonance.
4.1.3 A device that can record or display the resonance of the sample.
4.1.4 Instruments and equipment that can accurately measure or calculate the fundamental frequency of the sample resonance. such as a frequency meter, the accuracy should not be less than 0.5%.
4.1.5 A working surface away from external vibration and easy to measure.
4.1.6 Rigid metal specimen support. the length is at least equal to the side length (b) or diameter (d) of the specimen section, and the width should be less than the specimen length (l)
5%; The support can be a column with a square or rectangular cross-section. If the sample is cylindrical, the support should have a notch. The position of support such as
figure 1.
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