Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
1998-06-22
2001-02-27
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
Reexamination Certificate
active
06192763
ABSTRACT:
FIELD OF INVENTION
This invention relates to a method and apparatus for determining the compressive strength pathe of a mortar or concrete mix using the gas jet erosion resistance breakdown of freshly mixed mortar. Strength may be measured in various ways such as compression tensile or shear, compression being the most often specified.
BRIEF DESCRIPTION OF THE PRIOR ART
Basically concrete is a crute material used in volume. Being crude a design strength is set for each type of concrete. Presently however control within this design strength is difficult and this difficulty is covered by an overdesign strength to the lowest reasonable level and in doing so to increase the workability which is of the utmost importance in itself.
Each batch of concrete, made up of its peculiar aggregate, fine aggregate, cement, water and additives assumes its peculiar strength increse path. These peculiar strength paths intertwine as they proceed. It is the control of these peculiar strength paths from variations from their peculiar strength paths thast allows the reduction in over design strength.
The use of this invention would appeal to:
Architects and Engineers who are charged with safety and costs of construction,
Concrete suppliers who would have their production costs reduced and gain business resulting from lower prices and improved quality reliability, and
Structure owners who would gain from improved quality and reduced costs of their structures.
SUMMARY OF THE INVENTION
Accordingly this invention discloses an apparatus for determining the compressive strength path of a concete mix using the gas jet erosion resistance breakdown of freshly mixed mortar, said apparatus comprising a gas nozzle, a frame on which said nozzle is mounted and directed towards the surface of a test batch of said freshly mixed concrete, means on said frame for varying the distance of the nozzle from said surface, means for supplying gas to said nozzle through a range of pressures up to that necessary to effect erosion resistance breakdown of said surfacw and means for indicating the gas pressure supplied to said nozzle.
In another aspect this invention also discloses a method for determining the compressive strength path of a concrete mix, said method including:
A. Conducting a series of tests which comprise
directing a jet of gas at gradually increasing pressure onto the surface of a freshly mixed batch of said concrete.
Monitoring the surface of said concrete and recording the pressure of said gas jet at which erosion resistance of said concrete breaks down.
B. Averaging the recorded gas pressure of said tests to obtain a strength index for said concrete mix, and
C. Comparing said strength index to a predetermined set index of 3, 7, and 28 days compressive concete strength.
REFERENCES:
patent: 3631712 (1972-01-01), Mercier
patent: 4578989 (1986-04-01), Scott
patent: 4703427 (1987-10-01), Catala et al.
patent: 4900154 (1990-02-01), Waitzinger et al.
patent: 5396790 (1995-03-01), Koelliker et al.
Jacobson & Johnson
Noori Max
LandOfFree
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