GB/T 9966.11-2021Test methods for natural stone—Part 11: Determination of resistance to ageing by cold and thermal shock (English PDF)

Foreword

GB/T 9966 "Test Methods for Natural Stone" is divided into 18 parts.

Part 1: Compression strength test after drying, water saturation, and freeze-thaw cycles;

Part 2: Bending strength test after drying, water saturation, and freeze-thaw cycles;

Part 3: Water absorption, bulk density, true density, and true porosity tests;

Part 4: Abrasion Resistance Test;

Part 5: Hardness Test;

Part 6: Acid Resistance Test;

Part 7: Strength Test of Stone Hanging Component Assembly Unit.

Part 8: Test Method for Structural Strength Testing of Stone Hanging Systems Using Uniform Static Pressure Difference;

Part 9: Determination of dynamic elastic modulus by measuring the fundamental resonant frequency;

Part 10: Determination of the seismic performance of the hanger assembly unit;

Part 11: Determination of Accelerated Aging Strength Due to Rapid Cooling and Heating;

Part 12: Determination of Static Modulus of Elasticity;

Part 13: Determination of capillary water absorption coefficient;

Part 14: Determination of fracture resistance energy;

Part 15: Determination of Salt Spray Aging Resistance;

Part 16: Determination of the linear thermal expansion coefficient;

Part 17: Determination of Salt Crystallization Strength

Part 18: Lithofacies Analysis.

This part is Part 11 of GB/T 9966.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 9966 specifies the principle, equipment, sample preparation, and testing procedures for accelerated aging tests on natural stone to withstand cold and heat shock. Procedures, test results, and test report

This section applies to the determination of changes that may occur in natural stone under conditions of intense temperature changes (thermal shock).

4 Instruments and Equipment

4.1 Forced air drying oven. capable of maintaining the temperature at (105±5)°C.

4.2 Flat-bottomed container with lid. contains a sample holder that does not oxidize or adsorb the sample.

4.3 Balance. accurate to 0.01% of the weighed mass.

4.4 A set of equipment for measuring the dynamic modulus of elasticity.

4.5 Desiccant. A sealed container capable of holding at least one set of samples, with a built-in desiccant.

5 Sample Preparation

6 Experimental Procedure

7 Test Results

7.1 Record visually observable changes (compared to the reference sample), such as. Oxidation status. Color changes, the appearance of stains; Swelling; crack; Peeling.

7.3 Calculate the change in dynamic elastic modulus according to equation (2), accurate to 0.1%.

8 Test Reports

The test report should include at least the following information.

a) The commercial name of the stone as specified in GB/T 17670;

b) Sample quantity, dimensions, surface treatment (as required for testing), and orientation of anisotropic surfaces;

c) The name and address of the laboratory where the test was conducted; if the test was not conducted in a testing laboratory, the location of the test should be noted.

d) The standard number followed in the test (GB/T 9966.11-2021);

e) Observable changes in the appearance of each sample.

f) The percentage change in mass for each sample and the average percentage change in mass;

g) Percentage change in dynamic elastic modulus.

h) Uncertainty in the determination (where appropriate).