Split pipe testing device for the measurement of bond of reinforcement under controlled confinement
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJavier Malvar
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Abstract
A method and apparatus for determining the stress-slip relationship of specimens in concrete including a pipe with a plurality of longitudinal slots evenly spaced around the circumference of the pipe, a specimen and concrete block located in one end of the pipe, a confining device for applying a constant force to the circumference of the concrete block before, during and after a test, a device for measuring the displacement of the specimen relative to the concrete block, and a device for measuring the radial displacement of the concrete block.
Claims16
A method for determining the stress-slip relationship of a specimen in a material, the method comprising the steps of:
- a) installing the specimen and the material in a testing apparatus, said specimen located in said material and the testing apparatus attached to the outer surface of said material;
- b) installing said testing apparatus, said specimen and said material in a testing machine, the testing machine attached to both said testing apparatus and to said specimen, said testing machine capable of applying a force to said testing apparatus and said specimen;
- c) applying an initial confining pressure to said material;
- d) applying a force to said specimen and said testing apparatus to cause said specimen to be displaced from said material;
- e) maintaining the confining pressure of step c at the initial confining pressure before, during and after step d;
- f) measuring the displacement of said specimen relative to said material;
- g) measuring the radial displacement of said material;
- h) measuring the force applied in step d.
An apparatus for determining the stress-slip relationship of a specimen in a material when the specimen is dislodged from the material by means of a testing machine comprising:
- a) first means for communicating with the outer surface of said material;
- b) second means for communicating with said testing machine, the second means also communicating with the first means;
- c) third means for applying a constant confining pressure to said material before, during and after a test;
- d) fourth means for measuring the displacement of said specimen relative to said material when said specimen is dislodged from said material by said testing machine;
- e) fifth means for measuring the radial displacement of said material;
- f) sixth means for measuring the force applied to said specimen and to said material by said testing machine to dislodge said specimen from said material;
- g) seventh means for measuring the confining pressure applied to said material in c.
Dependencies are inferred from the claim text.