Shrinkage-compensating concrete

摘要

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.

主权项

1. A shrinkage-compensated crack-free concrete structure, comprising:
a hydraulic cement, an expansive additive, aggregate and water; and with the structure having no internal metal fibers or bars and no external restraint, and the structure having sufficient self-restraint wherein the structure remains free of cracks via expansive forces developed during hydration compensating for concrete shrinkage and with the length of the structure over time never shrinking below its original length.