For a good building stone how much is the required crushing strength?(a) Less than 50 N/mm^2(b) Greater than 100 N/mm^2(c) 155 N/mm^2(d) 10 N/mm^2I got this question in an interview for job.I would like to ask this question from Properties of Stones topic in portion Materials for Construction of Basic Civil Engineering

For a good building stone how much is the required crushing strength?(

1.	For a good building stone how much is the required crushing strength?(a) Less than 50 N/mm^2(b) Greater than 100 N/mm^2(c) 155 N/mm^2(d) 10 N/mm^2I got this question in an interview for job.I would like to ask this question from Properties of Stones topic in portion Materials for Construction of Basic Civil Engineering
Answer» Right option is (b) Greater than 100 N/mm^2 To explain I WOULD say: Crushing strength or COMPRESSIVE strength of a STONE is the load per UNIT area at which the stone starts cracking. It should be greater than 100 N/mm^2 to ensure sufficient strength for use in construction.

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