COMPRESSION TEST
1"
8 lb. Nominal: With
mat:
1. 11/32" = 22/64" 9/32" = 18/64"
2. 23/64" = 23/64" 19/64" = 19/64"
3. 23/64" = 23/64" 17/64" = 17/64"
4. 25/64" = 25/64" 5/16" = 20/64"
5. 13/32" =
26/64" 21/64" = 21/64"
FOR 12 SQ. IN.
SURFACE AREA
Using
a 50 lb steel rod of 27/16" diameter and 2.237 sq. in. of surface area
gave us much more measurable compression differences to work with; however, on
2" tests and 100 lbs tests on 1", a block 3"x4" for a total
surface of 12 square inches had to be used, as the 2.237 square inch surface of
the end of the rod ripped through the mat and destroyed and broke down the core
material. Increasing the square
inches of surface gave us a more accurate compressive strength test.
2"
8 lb. Nominal: With
mat:
1. 3/16" = 3/16" 3/16" = 12/64"
2. 1/4" = 4/16" 1/8" = 8/64"
3. 1/4" = 4/16" 7/32" = 14/64"
4. 5/16" = 5/16" 1/8" = 8/64"
5. 1/4" = 4/16" 5/32" = 10/64"
Average: 4/16" or 1/4" Average: 10/64" or 5/32"
50 LBS ON 12 SQ. IN.
ACHIEVED 12.5% COMPRESSION ON 2" AND 10% COMPRESSION ON 1" WITHOUT
MAT. THESE TABLES SHOW LBS
OF COMPRESSION NECESSARY TO ACHIEVE 12.5% COMPRESSION WITH MAT.
1"
8 lb Nominal 2"
8 lb Nominal
1. 90 lbs 90.5 lbs
2. 100 lbs 105 lbs
3. 100 lbs 90 lbs
4. 105 lbs 105 lbs
5. 90 lbs 100 lbs
Average: 99 lbs Average: 98 lbs
CONCLUSION: THE FIBERGLAS MAT INCREASES THE COMPRESSIVE STRENGTH OVER THAT OF THE MINERAL WOOL BOARD ALONE BY 98% IN THE 1" TEST AND 96% IN THE 2" TEST.