there are many test specified in IS code for testing of M sand.
You need to test properties which you are looking for to have it in that.
There is nothing special in M sand. M sand means crush sand, manufactured by crushing rocks, same way as how metals are made (Aggregates often called as Metal)
Below are the IS codes for doing tests on aggregates along with detailed descriptions.
IS Code | Description of code |
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IS 2386-1
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Methods of Test for Aggregates for Concrete, Part I: Particle Size and Shape
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IS 2386-2
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Methods of test for aggregates for concrete, Part 2: Estimation of deleterious materials and organic impurities
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IS 2386-3
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Methods of test for aggregates for concrete, Part 3: Specific gravity, density, voids, absorption and bulking
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IS 2386-4
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Methods of test for aggregates for concrete, Part 4: Mechanical properties
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IS 2386-5
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Methods of Test for Aggregates for Concrete, Part V: Soundness
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IS 2386-6
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Methods of test for aggregates for concrete, Part 6: Measuring mortar making properties of fine aggregates
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IS 2386-7
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Methods of Test for Aggregates for Concrete, Part VII: Alkali Aggregate Reactivity
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IS 2386-8
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Methods of Test for Aggregates for Concrete, Part VIII: Petrographic Examination
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So according to your requirement and purpose for which you are making use of M sand, select tests and check parameters of material are within the acceptable limits or not.