9214_k_value

Cially wetting the test area hence correction should

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Unformatted text preview: 1979 DEFORMATION CORRECTED In 2 In (v 0 0 s: in - mm DEFORMATION P 0 0 . 0 -7 hl E u ‘, NOTB - 1’4 2*1 0 In 6 0 . Corrected curve may lie above or below nctual curve. FIG. 4 CORRECTION OF LOAD-DEFLECTION 12 CURVE IS t 9214- 1979 0 Kb FIG. 5 16 8 kg PER 24 CUBIC 32 cm CHART FOR CORRECTION FOR Ku FOR BENDING OF THE PLATE 5.1.4.1 The correction of subgrade saturation shall consist of loading two samples of the undisturbed subgrade materials in a consolidometer as follows: a) One at the in situ moisture content, content; and that is, at natural moisture b) The other at a saturated condition. 5.1.4.2 The two specimens in the consolidometer shall be applied the same seating load that was used in the field plate bearing tests ( see 4.3.1 ). The seating load shall be allowed to remain’ on the specimen having in situ water content until the vertical movement becomes stable, at Now apply an additional this time a ‘ zero ’ reading should be taken. 31 kN ( 3 100 kgf) load. The total load should then be allowed to remain until the vertical dial gauge reading becomes stable. 13 IS I9214 - 1979 5.1.4.3 The second specimen should be allowed to saturate under the seating load, After the vertical dial gauge does not show any movement, a ‘ zero ’ reading should be taken and an additional 31 kN ( 3 100 kgf) load should now be applied. Take down the readings when vertical dial shows stable reading. 5.1.4.4 The corrections for saturation should be applied in proportion to the deformations of the two specimens under a unit load of 31 kN ( 3 100 kgf) in addition to the seating load as follows: x,-c 2 x uncorrected & value of modulus subgrade where X, = corrected value of subgrade for saturation. d t= deformation of a specimen with natural moisture content under unit load of 3 1 kN ( 3 100 kgf ). d, - deformation of a specimen when saturated under unit load of 31 kN ( 3 100 kgf). If< 8 = 1, this correction is inapplicable. 5.2 The corrections and order in which these explained on a flow chart given in Appendix C. should be applied are 5.2.1 For easy understanding of all the necessary corrections required to be applied in determination of K-value, a sample observations and calculations are given in Appendix D. 6. REPORT 6.1 The value shall be reported corrected to the second decimal place. 14 IS : 9214- 1979 APPENDIX A ( Clause 4.3.1 ) PRO ZORiUA FOR IN-PLACE K-VALUE - TEST METHOD Tested Location ................................................... Material of test point ................................. I by ................................................ Date ........................................................ Depth of test ............................................. Soaked Condition of test surface : -unsoaked . . . . . . . . . . . . Period of soaking, if any . , . . . . . . . . . . . . . . . . . . . . . . . . . . Moisture content . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . ._. Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Method used for determination of density . . . . . . . . Dia of plate used : PROVINQ RINQDIAL GAUGE READINGS -- (1) DG i I.;;, DG DG 2 3 DG 4 AVERAQE DEFLECTION, mm (3) (4) (6) (7) DEFLECTIONDIAL GAUGEREADINGS (W) (2) (5) (8) K-value, kgf /cmS/cm MPa/cm ____ CUMULATIVE DEFLECTION, mm Uncorrected Value, KU Corrected for Bending, Kb (10) (9) Corrected for Load af Deflection, Kd (11) Corrected for Saturatiop,KS (12) Corrected for Size of Plate, KP Corrected K-value (13) (14) Rejected test with reason .............................. Result of repeat 15 test if conducted .................. APPENDIX ( Clause 4.3.2) B &VALUE ( MODULUS OF SUBGRADE REACTION )TEST METHOD 11 PRO FORMA FOR IN-PLACE _. . . . . ....
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