Vacuum shall be increased to at least 70 cm of Gradually increasing vacuum with bottom outletĬlosed so as to remove to form the soil voids. Permeability, the specimen shall be subjected to a Alternatively, in the case of soils of low Soils of low permeability requireįlow under a high head for periods ranging from aĭay to a week depending upon the permeability and To sufficient head, flow or immersion so as to obtainįull saturation. High permeability, the specimen shall be subjected The drainageĬap shall then be fixed over the top of the mould. The mixture shall beĬompacted using a small tamping rod. Slurry, the mould shall be kept on a flat surface Mixture of 10’percent dry powdered bentonite andĩ0 percent fine sand by weight to provide sealingīetween the soil specimen and the mould against Impervious material such as cement slurry, or a Mould and the specimen shall be filled with ‘an The specimen shall be placedĬentrally over the porous disc of the drainage baseįixed to the mould. Trimmed in the form a cylinder not larger thanĪbout 85 mm in diameter and having a height equal For testing undisturbed soils, undisturbed specimen shall be.The porous discs shall be saturated before The mould with the specimen inside shallīe assembled to the drainageand cap having porousĭiscs.Theīase shall be detached and the mould full of the Soil trimmed level with the top of the mould. The collar, if attached, shall be removed and excess TheĬompactive effort may be varied to simulate fieldĬonditions. The moisture content usedįor compaction should be the optimum moistureĬontent or the field moisture as the case may be. (Part 8)-19831 or any other density at which the The maximum dry density estimated by thecompaction tests [see IS : 2720 (Part 7)-1980 and IS:2720 The dry density for remoulding of soil samples shall be either the field density or the value of.Inside of the mould, it shall be clamped between theĬompaction base plate and the extension collar. Until the actual moisture content is within 0.5 percent of that desired.Įmpty to the nearest gram. The moisture content of the sample shallĪgain be determined and the entire process repeated Material shall again be placed in the storage container. Over the sample, and after thoroughly mixing, the The quantity of water to beĪdded to the stored sample to give the desired moisture content shall be computed and spread evenly The sample shall be placed in anĪirtight container. Shall be determined as described in IS : 2720 The moisture content of the 2.5-kg sample.A 2.5-kg sample shall be taken from a thoroughly mixed air-dried or oven-dried material which has been obtained in accordance with IS : 2720 (Part l)-1983.Void ratio, e,Īnd degree of saturation Sare calculated using specific gravity G, of the specimen and water content, W. The water content, W is computed and noted. Then the sample is dried in the oven for 24 hours and the dry weight Remarks, if any,Īt the end of the test, the weight of wet soil specimen In stand-pipe and are recorded in co1 2 to 5 of Appendix B respectively.Īre calculated and recorded in co1 6 and 7 of Appendixī respectively. The temperature T, of water is also measured and recorded.ĭuring the test, observations are made of The dimensions of specimen, length L and diameter D, are measured and recorded in Appendix B. Miscellaneous Apparatus - Such as IS sieves, mixing pan, graduated cylinder, metre scale, stop watch, 75-micron wire gauge, thermometer and a source of de-aired water.Constant Head Tank - A suitable water reservoir capable of supplying water to the permeater under constant head for constant head test arrangement.Set of Stand Pipes - Glass stand pipes for falling head (variable head) test arrangement, varying in diameter from 5 to 20 mm, suitably mounted on stand or otherwise fixed on wall.The compaction rammer shall conform to IS : 9198-1979.The mould assembly (including drainage base and drainage cap) shall conform to IS : 11209-1985.
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