NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design Final Report (1997) / Chapter Skim
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A: Diametral Test Equipment and Equations for Data Reduction
A: Diametral Test Equipment and Equations for Data Reduction
Pages 295-314
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From page 296... ...
connects the upper platen to the load cell. To insure Mat the longitudinal center line of the loading strips remain in the vertical diametral plane of the test specimen throughout the testing, an alignment bar is connected to one side of the upper loading platen.
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From page 297... ...
LOAD sea BAR L UPPER LOADING ~ STRIP PLACED ON INS Mu CONIC ~ SPECIMEN GROOVE ~I ~- 1 1 \ \~ SPECIE I . ~ -7 , , =~/BOTTOM LOADING ~ jet S1 RIP AND PLATE T. ~ Figure A-la.
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From page 299... ...
r ~ AT ~ ,~,n install, center on loading strip 41_ roll gently against bracket 1. 1 -- ' ' -~l _ It,tillll~ylU~tl j At, jar, \ Q~ ~n - 1 _ ~ I ~' 1t = Figure A-4.
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From page 300... ...
diameter steel ball that rests on the upper loading plate in an inverted conical groove on the center. The Baladi device, in contrast to the others, has a hinged upper loading strip so as to accommodate a nonuniform diameter specimen.
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11 : r ~ \ . , L TEST SPECIMEN 1 1 1 \ BOrrOM LOADING STRIP, FIXED Figure A-S.
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From page 302... ...
The SHRP personnel also suggested mounting the EVDTs directly on to He top of He upper loading strip by drilling a hole through the upper loading platen or to use snap-in spring-Ioaded EVDTs between He loading strips (while using a stop collar on the guide posts to avoid damaging the EVDTs during testing)
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Cl c: \ in o :, ME 1 ~ c)
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~ 1 Figure A-7. SHRP LO Device setup at NCSU with a synthetic specimen A-10
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This marking device, along wig lines etched on the center of Me loading strips, helps in reducing rocking and making the alignment of Me specimen much easier. Indirect Tension Test Analysis Methods AS7M Analyst Lois analysis is from Me ASTM D 4123-82 procedure for Me resilient modulus testing of asphalt cohere.
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From page 306... ...
The elastic analysis method was developed during this study and is based on an assumption of linear elastic behavior of a statically loaded specimen. The following equations were developed for Me strains along the tic and y axes from the stress equations given by Hondros [A-21: 4P £X = {MR7C -4P ~ {MR7C I where, (1 X )
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From page 307... ...
wide loading strip, provided the ratio of gage length to specimen diameter is the same. For example, the equations derived for a 1 in.
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From page 308... ...
and 6 in. diameter specimens with a gage length to diameter ratio of 3/4 and ~ for vertical and horizontal deformation, respectively.
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proposM an analysis system for He Gage~o~nt-mount~ system of measuremerK. It only applies for a gage length to diameter ratio of I:4 and when He height of He surface mounted EVDT Is 0.25 in.
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From page 310... ...
= 0 98 GL, where, ~= H gage length, in. horizontal deformation, in.
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From page 311... ...
YCOM C7Rr £CTR,` (S YCOM ~ ~ ECrR, , IS XCOM (19) If Poisson's ratio calculated In Step 6 differs by more Man 0.01 win Poisson ratio In Step ~ Men replace m in Step ~ by Me value calculated In Step 6 arm repeat Steps 2 - 6, else go on to the next stop.
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From page 312... ...
Next, uniformly mix the epoxy on a glass plate or other suitable surface. Apply the epoxy at the gluing surfaces on the mounting blocks, and then carefully align the alignment device such that the lines marked on the support legs match the diametral axes.
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(1959) , "The Evaluation of Poisson's Ratio and the Modulus of Materials of a Low Tensile Resistance by the Brazilian Indirect Tensile3 Test with a Particular Reference to Concrete", Australian Journal of Applied Science, Vol.
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