More C It allows for comparative analysis among beams containing different fiber types, including materials, dimension and shape, and different fiber contents. Results can be used to optimize the proportions of fiber—reinforced concrete mixtures, to determine compliance with construction specifications, to evaluate fiber—reinforced concrete which has been in service, and as a tool for research and development of fiber—reinforced concrete See Note 2. The results by this test method were on average 6. For tests of fiber-reinforced concrete containing relatively rigid or stiff fibers of length greater than 35 mm [1. When sawed beams are employed, and to avoid the effects of fiber orientation, care shall be applied to ensure that the flexural tensile surface of the beam is a sawed surface.
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Terminology 3. Current edition approved June 10, Published August Originally published as C — Last previous edition C — Summary of Test Method 4. Results can be used to C FIG. Apparatus 6. A load cell with a A suggested method to accomplish this measurement uses a spring—loaded electronic displacement transducer mounted on a suspension yoke as is shown in Fig. The support frame positions the transducers along the centerline of the top surface of the test beam at locations so as to contact the beam at midspan and each support location.
C FIG. The support frame either 1 surrounds the test beam and is clamped to the sides of the beam at points on a line passing vertically through the beam support locations, or 2 is seated on top of the beam and is itself supported at points directly over the beam supports.
The transducer is positioned to contact the specimen at mid span along the longitudinal centerline of the beam and is located either below or above the beam. Sampling, Test Beams, and Test Units 7. Use the same curing time when comparison between or among laboratories is desired.
The universal test machine must be capable of controlling the rate of motion of the loading head and meeting the requirements of test method ASTM C A load rating of 10, lbf will generally be required. A third point bend test or four point bend test can be performed. In four point bend tests, the maximum flexural stress is spread out over the section of the beam between loading points.
ASTM C1399 Residual Strength Fiber-Reinforced Concrete Test Equipment