Shrinkage-compensating concrete
AssigneePKL Corporation
InventorEdward K. Rice
Life of this patent
Estimating the term…
Abstract
A shrinkage compensating concrete does not require restraint. The expansive forces developed during hydration compensate for concrete shrinkage, obviating the need for any added internal or external restraint element. Using this new shrinkage compensating concrete, substantially crack-free slabs may be built without using restraining steel bars, fibers, or other separate restraining element. The shrinkage compensating concrete includes a cement that develops internal expansive forces that never exceed the tensile strength of the concrete, such that the internal expansion compensates for the concrete shrinkage. The expansive cement may be an ASTMS, M or S cement, or other expansive cements may also be used.
Claims17
A method of using a shrinkage-compensating mortar, comprising:
- making a shrinkage-compensating mortar by combining a hydraulic cement, an expansive additive, sand and water;
- forming the shrinkage-compensating mortar into a mortar structure, with substantially no internal restraint in the mortar structure and with no external restraint acting on the mortar structure;
- and
- the structure having an expansion exceeding the limits of ASTM C 845.
A method of using a shrinkage-compensating mortar consisting essentially of a calcium sulfoaluminate cement, an expansive additive, sand and water, comprising:
- mixing the cement, the expansive additive, the sand and the water to provide a shrinkage-compensating mortar;
- forming the shrinkage-compensating mortar into a structure and allowing the structure to hydrate with substantially no internal restraint in the mortar structure and no external restraint acting on the structure.
A method of using a shrinkage-compensating mortar consisting essentially of a hydraulic cement, an expansive additive, sand and water, comprising:
- mixing the hydraulic cement, the expansive additive, the sand and the water to provide a shrinkage-compensating mortar having an expansion exceeding the limits of ASTM C 845;
- forming the shrinkage-compensating mortar into a structure and allowing the structure to hydrate with substantially no internal restraint in the mortar structure and no external restraint acting on the structure.
Dependencies are inferred from the claim text.