Any soils that can be excavated with handtools is suitable provided that the void or pore openings in the soil mass are small enough to prevent the calibrated sand used in the test from getting into the natural voids.
Moreover, the soils being tested should have sufficient cohesion or particle interlocking to maintain side stability during excavation of the test pit. Furthermore, it should also be firm enough not to deform or slough due to the pressures exerted in digging the hole and pouring the sand.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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It is noted that the initial setting time of cement is 30 min(minimum).Is there any upper limit? and if suppose i am getting a value more than 200 min ,is it suitable for site condition?