It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The test specimen shall be supported on a lower bearing of two parallel longitudinal strips and the load applied through an upper bearing Figs. At the option of the manufacturer, either or both the lower bearing and the upper bearing may 2. Current edition approved June 10, Published March Originally published as C 62 T.
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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The test methods described are usedin production testing and acceptance testing to evaluate theproperties provided for in the specifications. It is theresponsibility of the user of this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use. Referenced Documents2.
Current edition approved Oct. Published September Originallyapproved in Last previous edition approved in as CM — United States The test specimen shall be supported on a lower bearingof two parallel longitudinal strips and the load applied throughan upper beam Fig. At the optionof the manufacturer, either or both the lower bearing and theupper bearing shall extend the full length or any portion of thelength of the specimen.
Wooden strips shall be straight, have a crosssection of not less than 50 mm in width and not less than 25mm nor more than 38 mm in height and shall have the topinside corners rounded to a radius of 13 mm.
Hard rubber stripsshall have a durometer hardness of not less than 45 nor morethan They shall be rectangular in cross section, having awidth of not less than 50 mm, a thickness of not less than 25NOTE 1—The figures illustrate a method of applying the load to the pipeFIG.
The rigid base shall be at least mm wide. Theinterior vertical sides of the strips shall be parallel and spaceda distance apart of not more than 25 mm per mm ofspecimen diameter, but in no case less than 25 mm. Thebearing faces of the lower strips shall not vary from a straightline vertically or horizontally by more than 2. The wood shall be sound,free of knots, and straight and true from end to end. The bearing face of the upperbearing shall not deviate from a straight line by more than 2.
When a hard rubber strip is used on thebearing face it shall have a durometer hardness of not less than45 nor more than 60, and shall have a width of not less than 50mm and a thickness of not less than 25 mm nor more than 38mm and shall be secured to a wood beam meeting the aboverequirements. At the option of themanufacturer, the center of the load shall be applied at anypoint of the overall length L1 of the specimen.
The load shallbe applied either at a single point or at multiple pointsdependent on the length of the specimen being tested and therigidity of the test frame. NOTE 1—The user of these test methods is advised that multiple pointsof load applications to the upper bearing will permit use of lighter beamswithout excessive deflection.
A calibration curve shall be used. The machines used forperforming the three-edge-bearing tests shall be verified inaccordance with Practices E4. Place the upperbearing so that it is aligned with these marks.
If both the design strength and the ultimate strength arebeing determined, a specified rate of loading need not bemaintained after the design strength has been reached. Fornonreinforced concrete pipe, any rate of load application up toa maximum of The crack is0. Measure the width of thecrack by means of a gage made from a leaf in thickness as ina set of standard machinist gages , ground to a point of 1.
NOTE 2—As used in this specification, the 0. NOTE 3—Ultimate strength of concrete pipe in the buried condition isdependent on varying soil bedding factors and varying failure modes andshall have no relationship to the ultimate strength as defined underthree-edge bearing conditions.
The length used in calculating thestrength values shall be that indicated by the manufacturedlength L inFigs. For pipe with a bell, the manufacturedFIG. For plain end or cutpipe, no bell or spigot, the manufactured length L is the sameas the overall length L1. For pipe having a spigot on one endwith the opposite end being plain, the manufactured length L shall be the distance from the plain end to the center of thejoint.
For pipe having a bell on one end with the opposite endbeing plain, the manufactured length L shall be the distancefrom the plain end to the bell inside shoulder. See TerminologyC for definitions of manufactured length L and overalllength L1. The 0. The ultimate D-load strength shall becalculated by dividing the ultimate test load applied to the pipeby the manufactured length, L , and by the pipe insidediameter or horizontal span.
Therefore, no calculations of precision and bias are presentlypossible. Specifications that include this test method for thevarious types of concrete pipe should include a provision foradditional tests of one or more specimens. Flat Slab Top Test Method5. Assemble theflat slab top to this section. If a frame or riser has been designedto be fitted to the access portion of the flat slab top, assembleit to the slab top.
Apply the test load to the riser or frame asassembled to the flat slab top. If no access opening has beenprovided to the flat slab top, apply the test load to the center ofthe flat slab top by means of a by by mm woodbearing block. See Fig. Calculate the test load as follows:Pu5 1. Core Strength Test Method6.
ASTM C 497.pdf