ASTM C496 PDF

Current edition approved Feb. Published March Originally approved in Last previous edition approved in as C — Summary of Test Method 3. This loading induces tensile stresses on the plane containing the applied load and relatively high compressive stresses in the area immediately around the applied load.

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Current edition approved Feb. Published March Originally approved in Last previous edition approved in as C — Summary of Test Method 3. This loading induces tensile stresses on the plane containing the applied load and relatively high compressive stresses in the area immediately around the applied load. Tensile failure occurs rather than compressive failure because the areas of load application are in a state of triaxial compres- sion, thereby allowing them to withstand much higher com- pressive stresses than would be indicated by a uniaxial com- pressive strength test result.

Apparatus 5. The surfaces of the bar or plate shall be machined to within 6 0. It shall have a width of at least 2 in. The bar or plate shall be used in such manner that the load will be applied over the entire length of the specimen. The bearing strips shall be placed between the specimen and both the upper and lower bearing blocks of the testing machine or between the specimen and supplemental bars or plates, when used see 5.

Bearing strips shall not be reused. Test Specimens 6. Moist-cured specimens, during the period be- tween their removal from the curing environment and testing, shall be kept moist by a wet burlap or blanket covering, and shall be tested in a moist condition as soon as practicable. Procedure 7. NOTE 1—Figs. The device consists of three parts as follows: 1 A length of 4-in.

NOTE 2—Fig. The device consists of: 1 A base for holding the lower bearing strip and cylinder, 2 A supplementary bearing bar conforming to the requirements in Section 5 as to critical dimensions and planeness, and 3 Two uprights to serve for positioning the test cylinder, bearing strips, and supplementary bearing bar.

Determine the length of the specimen to the nearest 0. Place the specimen on the plywood strip and align so that the lines marked on the ends of the specimen are vertical and centered over the plywood strip.

Place a second plywood strip lengthwise on the cylinder, centered on the lines marked on the ends of the cylinder. Position the assembly to ensure the following conditions: FIG.

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