Every stone intended for building purposes that does not come from some well-known quarry should be tested by chemical analysis, and the results compared. Building stones of Edinburgh: tests on building stones. " it is the properties of these common rock-forming minerals, together with their mode of. In the course of the latter considerable mate- r~al relating to building stones has accumulated. Some of the most important quarry regions in the state havA been'.


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Transverse strength test A specimen of the stone whose length is ten times its depth is placed on wedge-shaped supports near its ends.

Building Stone & Rock Tests

A vertical load applied at the centre is gradually increased until failure occurs. Test on building stones approximate values for ordinary stone are: Granite 10 — Impact test A steel hammer of 20 N is allowed to fall axially in the specimen.

The blow at which the specimen breaks represents the toughness of the stone. Maximum number of specimen to be tested is three. Such specimen should be placed in test on building stones for about 72 hours prior to test and therefore tested in saturated condition.

Load bearing surface is then covered with plaster of paris of about 5mm thick plywood.

  • Building stones of Edinburgh: tests and properties - Earthwise
  • Tests on Building Stones - Strength and Properties of Stones
  • Tests on Building Stones – Strength and Properties of Stones
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Load is applied axially on the cube in a crushing test machine. Crushing strength of the stone per unit area is the maximum load at which the sample crushes or fails divided by the area of test on building stones bearing face of the specimen.

Building stones of Edinburgh: tests and properties

They are dried for 72 hrs and weighed. They are dried at degree C and weighed.


Difference in weight is noted. This procedure of drying, weighing, immersion and reweighing is repeated at least 5 times. Each time, change in weight is noted and it is expressed as a test on building stones of original weight. Crystallization of CaSO4 in pores of stone causes decay of stone due to weathering.

But as CaSO4 has low solubility in water, it is not adopted in this test. Freezing and thawing test Stone specimen is kept immersed in water for 24 hours.

It is then placed in a freezing machine at degC for 24 hours. Then it is thawed or warmed at atmospheric temperature.

This should be done in shade to prevent any effect due to wind, sun rays, rain etc. A cylinder of diameter 25mm and height 25mm is taken out from the sample of stone.

Testing of Building Stones - Rock Tests on Lab & Field

Annular steel disc machine is then rotated at a speed of 28 rpm. During the rotation of the disc, coarse test on building stones of standard specification is sprinkled on the top of disc.

After revolutions, specimen is taken out and weighed. Beare also subjected some of the specimens to a freezing test for which he had to rely upon natural conditions; freezing previously soaked specimens by placing them out of doors overnight and thawing them indoors during the day.


The test was terminated by a thaw. Beare obtained his samples for testing by the simple expedient of inviting quarry owners to submit three specimens of stone in the form of two and one quarter inch cubes.


We may presume that these were very likely selected samples of the best stone that the quarry could produce and therefore not representative samples.