A number in parentheses indicates the year of lastreapproval. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Significance and Use3.
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A number in parentheses indicates the year of lastreapproval. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.
Combining values from the two systems may result in non-conformance with the standard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Significance and Use3. Nonrepeti-tive static plate load tests are performed on soils and unboundbase and subbase materials to determine the modulus ofsubgrade reaction or a measure of the shear strength ofpavement components.
The supporting points wheels in thecase of a truck or trailer shall be at least 2. The jack shall have sufficient capacity for applyingthe maximum load required, and shall be equipped with anaccurately calibrated gage that will indicate the magnitude ofthe applied load.
The diameters of adjacent plates in the pyramid arrangementshall not differ by more than mm [6 in. For evaluation purposes alone, asingle plate may be used, provided that its area is equal to the tire-contactarea corresponding to what may be considered as the most criticalcombination of conditions of wheel load and tire pressure.
For the purposeof providing data indicative of bearing index for example, the determi-nation of relative subgrade support throughout a period of a year , a singleplate of any selected size may be used.
It shall be at least 5. Current edition approved Jan. Published January Originallyapproved in Replaces D — Last previous edition approved in asD — 93 DOI: United States1entire deflection measuring system shall be adequately shadedfrom direct rays of the sun. Set the remaining plates of smallerdiameter concentric with, and on top of, the bearing plate. Setthe bearing plate level in a thin bed of a mixture of sand andplaster of paris, of plaster of paris alone, or of fine sand, usingthe least quantity of materials required for uniform bearing.
Toprevent loss of moisture from the subgrade during the load test,cover the exposed subgrade to a distance of 1. For confined tests thediameter of the excavated circular area shall be just sufficient toaccommodate the selected bearing plate. When using two dial gages, they shall be set neareach extremity of a diameter of the bearing plate, Each individualset of readings shall be averaged, and this value is recorded asthe average settlement reading.
When the dial needles come to rest followingrelease of this load, reseat the plate by applying one half of therecorded load producing the 0. When the dial needles have then again come torest, set each dial accurately at its zero mark. The magnitude of each load increment shall besmall enough to permit the recording of a sufficient number ofload-deflection points to produce an accurate load-deflectioncurve not less than six. After each increment of load has beenapplied, maintain the load until a rate of deflection of not morethan 0.
Record load and deflection readings for each load increment. Continue this procedure until the selected total deflection hasbeen obtained, or until the load capacity of the apparatus hasbeen reached, whichever occurs first.
At this point, maintainthe load until an increased deflection of not more than 0. Record thetotal deflection, after which release the load to load at whichthe dial gages were set at zero, and maintain this zero-settingload until the rate of recovery does not exceed 0. Record the deflection at thezero-setting load. Record of Tests6. Calculation and Plotting of Load-DeflectionRelationships7. Also plot the recovery after full release ofload.
Correction should be made for the zero deflection point,taking into account the dead weight of the equipment and theseating load. From this graph, the relation of load and totaldeflection for that load, and the relation of rebound andresidual deflection for the maximum load used, may beobtained.
Precision and Bias8. Soilsand flexible pavement components at the same location mayexhibit significantly different load deflection relationships. Nomethod presently exists to evaluate the precision of a group ofnonrepetitive plate load tests on soils and flexible pavementcomponents because of the variability of these materials.
Thesubcommittee is seeking pertinent data from users of this testmethod that may be used to develop meaningful statements ofprecision and bias. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend.
If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Plate Load Test Standard ASTM D1196 D1196M-12
A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. Scope 1. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
ASTM D1196/D1196M - 12(2016)
ASTM D1193 Water