Additive for, method of adding thereof and resulting cured cement-type concreations for improved heat and freeze-thaw durability

Abstract

An additive for, a method of adding thereof to uncured mixes for and resulting cured cement-type concreations such as cured embodiments of concrete, marcadam, and roof-top shingles each exhibiting improved heat and freeze-thaw durability resulting from reduced efflorescence and stability against sun ultraviolet light exposure.

Description

PRIOR ARTPrior art patents include U.S. Pat. No. 3,645,763 issued Feb. 29, 1972 to Anathony R. Ronzio et. al., U.S. Pat. No. 3,895,953 issued Jul. 22, 1975 to Povindar K. Mehta et al., U.S. Pat. No. 4,268,316 issued May 19, 1981 to Milton H. Wills, Jr., U.S. Pat. No. 4,434,193 issued Feb. 28, 1984 to Thomas Beckenhauer, U.S. Pat. No. 4,983,220 issued Jan. 8, 1991 to Alain Mathieu, U.S. Pat. No. 4,999,218 issued Mar. 12, 1991 to Gerd Rebner, et al., U.S. Pat. No. 5,460,648 issued Oct. 24, 1995 to Craig T. Walloch et al., U.S. Pat. No. 5,494,741 issued Feb. 27, 1996 to Frank Fekete, U.S. Pat. No. 5,531,824 issued Jul. 2, 1996 to J. Pate Burkes et al., U.S. Pat. No. 5,595,594 issued Jul. 21, 1997 to Jier-Yi Dong et al.BACKGROUND & OBJECTSIn the relevant trade heretofore up to the time of the present invention, it became apparent to those skilled in the art that preexisting cured cements, .[.marcadam.]. .Iadd.macadam .Iaddend.and roof-top shingles prior to the present invention each and...

AI Technical Summary

Benefits of technology

is to achieve an ultimate result of reduced efflorescence during and after curing of cement-type concreations against one or more of repetitive heat and freeze-thaw conditions and prolonged and / or repetitive exposure(s) to sunlight ultraviolet light radiation, as a result of each of novel additive compositions, method(s) of adding and / or creation, and the resulting time-cured aforenoted embodiments thereof.

In an eighty-first preferred embodiment as an improvement on the broad generic invention, the compound a) is stable through ultraviolet exposure of at-least 100 cycles of a D65 light source of a weatherometer designated A QUV accelerated panel unit.

Problems solved by technology

While efforts to improve durability and reduction of efflorescence (powdering resulting from water-loss) have been made in the prior art by the utilization of compositions designated efflorescence control agents (often designated ECA), it is well known that the inclusion of such ECA--typically calcium stearate alone in concrete formulations, often results in "reduced" durability of the resulting the final cured product.

Moreover, recent testing completed by the NCMA and Control testing laboratories show that the use of sealers is ineffective in reducing efflorescence and / or improving durability of concrete products.

Despite the many prior and conflicting attempts of prior art artisans to attain combined both durability and efflorescence control (suppression) and / or improvement(s) in numerous one(s) of a variety of concrete-type products, lack of satisfactory results and / or remedies heretofore have resulted in necessary continued attempts in the trade, to obtain more effective approaches and resulting concrete-type products in these regards.

Additionally, in addition to continuing aforenoted problems, also for prior and present concrete-type concreations, yellowing thereof of cured products thereof have in the past and heretofore have continued to be a plaguing problem prior to the present invention, heretofore resulting in continuing loss(es) of sales thereof as a result of contractors and / or home owners and the like finding such yellowing discoloration aesthetically unattractive and thus undesireable.

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