1. TESTS ON STONES HARDNESS TEST Scratching of stone
Moh’s scale of hardness

2. TESTS ON STONES 2. CRUSHING TEST To determine strength (?)
Cube size – 40mmx40mmx40mm
Placed in water – 72 hours
Compression testing machine

3. TESTS ON STONES 3. HARDNESS TEST (DORRY ABRASION)
To find coefficient of hardness
Cylinder – dia 25mm & height 25mm
Load gm
Speed – 28rpm
After 1000 revolution it is weighed
Coefficient of hardness = 20 – loss in wgt 3

4. TESTS ON STONES 4. IMPACT TEST To determine toughness index
Cylinder – dia 25mm & height 25mm
Steel hammer – 20N

5. TESTS ON STONES 5. FIRE RESISTANCE TEST Presence of Calcium carbonate
Sulphuric acid –Bubbles
6. ACID TEST
Presence of Lime & Alkaline content
Sulphuric acid - Efflorescence

6. TESTS ON STONES
7. ATTRITION or ABRASION TEST(Deval’s attrition machine)
To determine rate of wear of stones
50N sample taken
Dia = 200mm, Length = 340mm
5hrs at 30rpm
Sieve size = 1.5mm
Retained material weighed
Percentage wear = loss in wgt
Initial wt

7. TESTS ON STONES 8. WATER ABSORPTION TEST
To determine Electrical resistance
0.5N Cube
W1, W2
Percentage absorption = W2 – W1 X 100 W

8. TESTS ON STONES 9. SMITH’S TEST
To determine presence of earthly matter
10. CRYSTALLIZATION TEST
To determine durability or weathering quality
Sodium sulphate
Difference in weight

9. TESTS ON STONES 11. MICROSCOPIC TEST: Geologist test
12. FREEZING & THAWING TEST:
120C