TESTS ON STONES HARDNESS TEST Scratching of stone

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Presentation transcript:

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

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

TESTS ON STONES 3. HARDNESS TEST (DORRY ABRASION) To find coefficient of hardness Cylinder – dia 25mm & height 25mm Load - 1250gm Speed – 28rpm After 1000 revolution it is weighed Coefficient of hardness = 20 – loss in wgt 3

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

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

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

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

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

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