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A.S.T.M. C-90 specifies the following tests for load-bearing concrete
masonry units (for both TRENDSTONE® and TRENDSTONE PLUS® units)
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| Compressive Strength and Moisture Absorbancy |
A test to ensure that blocks meet strength and moisture requirements,
and are free of cracks and other defects. |
Complies |
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A.S.T.M. C-744 specifies the following tests for TRENDSTONE® ground
face concrete masonry units
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| Cracking and Crazing |
A test to ensure that the units are free from cracking and/or crazing. |
Complies |
| Adhesion |
A test to determine the adhesion of the finished facing to the block
substrate. |
Complies |
| Abrasion |
A test to measure the abrasion resistance of the finished facing. |
Complies |
| Color Change |
A test by accelerated weathering apparatus to measure change. |
Complies |
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A.S.T.M. C-744 Specifies the following tests for TRENDSTONE PLUS®
ground face concrete masonry units
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| Cracking and Crazing |
A test to ensure that the units are free from cracking and/or crazing. |
Complies |
| Resistance to Staining and Chemicals |
Testing of various chemical, i.e. detergents, solvents, and Chemicals
etc., in concentrations set by ASTM standards and A.S.T.M. requirements. |
Complies |
| Adhesion |
A test to determine the adhesion of the finished facing to the block
substrate. |
Complies |
| Abrasion |
A test to measure the abrasion resistance of the finished facing. |
Complies |
| Flame Spread Index† |
A test to determine how much the finished facing will allow flame to
spread in a fire. |
Complies |
| Smoke Development†† |
A test to determine the amount of smoke given off by the finished facing
in a fire. |
Complies |
| Color Change |
A test by accelerated weathering apparatus to measure color fading or
change. |
Complies |
| Soiling and Cleansability |
A test to determine how easily the finished surface can be cleaned. |
Complies |
| Efflorescence |
A test to ensure that soluble salts do not migrate to the surface when
moisture is present. |
Complies |
| Dimensional Tolerances |
A test to ensure that variations in the sizes of the blocks in all dimensions
are less than 1/16". |
Complies |
| Face Variation |
A test to ensure that the finished facing dimensions do not vary more
than 1/16". |
Complies |
| Depth Variation |
A test by measurements to ensure that the thickness of the prefaced
block are within 1/16" of the specified size. |
Complies |
| Distortion of Facing |
A test by measurements to ensure that the finished facing is straight,
true, and in plane within 1/16". |
Complies |
| Surface |
A laboratory inspection for quality of the facing (no imperfections). |
Complies |
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Other Tests: (for both TRENDSTONE® and TRENDSTONE PLUS® units)
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| Freeze/Thaw Test |
A test to ensure that the finished facing does not crack or craze when
exposed repeatedly to freeze thaw cycles |
Complies |
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†The test method specified in ASTM E-84 is used to determine surface
burning characteristics.
††In this test, red oak is given a value of 100 and asbestos cement
board is given a value of 0 to calibrate the test equipment.
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