STONES Flashcards
STONES
Blasting powder - 65 % saltpetre, 20% sulphur, 15% charcoal
method to construct tunnels in rocks - drift method
jumper tool - for quarrying
spalling hammer - rough dressing
cross cut saw - cutting of stones
boasted finish of dressing - making non continuous parellel marks
6 to 12 months in open air for removing quarry sap
crushing strength of stone does not depend upon workability
retaining walls - heavy stones are used
rubble masonry - hard stones
compr stength of sandsone - 650kg/cm2
crystallization test - to find durability
smiths test - to find durability and presence of muddy substance
schimdt hammer test - to find hardness
Test to be conducted on stones in docks and harbours - weight test
for slabs - slate
for piers,abutments , ballast - granite
for ornamental work - marble
cement making - chalk
white marble found in jabalpur
black marble found in jaipur
extremely fine grained - basalt
slate - damp proofing
highest bearing cap - hard rocks
least bearing cap - loose gravel
most weatering characteristics- quartzite(made from sandstone)
compact sandstone - fire resistant
sandstone - siliceous, aqueous, sedimentary rock
gypsum - chemically precipitated sedimentary rock
shingle - crushed granite
pegmatite - intrusive igneous rock
quartz, mica - minerals
syenite- plutonic rock
