Basic Civil & Mechanical Engineering: UNIT II: i. Stones
Testing of building stones
1. Hardness Test: Hardness of a stone is tested by a pen knife which should not produce a scratch on a hard stone. Hardness Number is determined using Mohr's scale of hardness.
TESTING OF BUILDING STONES
1.
Hardness Test: Hardness of a stone is tested by a pen
knife which should not produce a scratch on a hard stone. Hardness Number is
determined using Mohr's scale of hardness.
2.
Impact Test: It is carried out on Impact Testing
Machine to find the toughness of a stone.
3.
Test for Crushing Strength: This test is carried out
in a Compression Testing Machine.
4.
Fire Resistance Test: The stone, which is free from
Calcium Carbonate, can resist fire. The presence of Calcium Carbonate in the
stone can be detected by dropping a few drops of dilute Sulphuric Acid which
will produce bubbles.
5.
Abrasion Test: It is carried out to determine the
percentage of wear of stones used for the construction of road. It is carried
out in Deval's Attrition Testing Machine.
6.
Acid Test: In this test, a specimen stone is kept
for 1 week in the solution of Sulphuric Acid and Hydrochloric Acid. The corners
of stones with high alkaline content turn roundish. Also, loose particles will
get deposited on its surface.
7.
Microscopic Test: This is a Geologist’s test. In this
test, the sample of stone is subjected to microscopic examination to study the
properties, namely, Mineral Constituents, Texture of Stone, Average Grain Size
and Presence of Pores, Fissures and Veins.
Basic Civil & Mechanical Engineering: UNIT II: i. Stones : Tag: : - Testing of building stones
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Basic Civil and Mechanical Engineering
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