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US 5,487,307 AGranted
Method and apparatus for testing concrete expansion
AssigneeKalman Floor Company
InventorsRobert Landgren, William F. Perenchio
Life of this patent
Estimating the term…
Abstract
A method and apparatus is disclosed for measuring on-site expansive volumetric changes in hardened, shrinkage-compensated concrete samples. The sample is disposed in a cylindrical container having a strain gauge for measuring hoop stress which is correlated with expansion of the sample.
Claims17
Apparatus for measuring volumetric changes in hardenable samples comprising:
- a steel container having an open top and an uninterrupted upstanding sidewall for receiving and containing a hardenable sample therein in intimate and direct contact with an inner surface of said sidewall;
- and
- strain gauge means secured to the sidewall of the container and being disposed for sensing expansive changes in said sidewall in response to volumetric changes in the sample upon hardening and being operable when energized to produce a signal indicative of such volumetric changes in the sample.
A method for measuring volumetric changes in curable samples comprising the steps of:
- disposing a sample of curable material into intimate and direct contact with an inner surface of a steel container having an open top and an uninterrupted upstanding cylindrical sidewall, securing a strain gauge to said sidewall to sense expansive changes of the sidewall in response to volumetric changes in the sample;
- and recording on-site volumetric changes in the sample in accordance with the changes in the strain gauge.
Dependencies are inferred from the claim text.