US 2012/0121329 A1Published application

Alkali silica reactivity (ASR) resistant aggregate concrete

OwnerMike Guntherinventor

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Abstract

Improved methods are provided for producing exposed aggregate concrete resistant to alkali silica reactivity. A concrete mixture is poured over a subgrade into a formwork. In a first embodiment, the concrete mixture includes a combination of lithium nitrate solution and concrete. In an alternative embodiment, the concrete mixture is a combination of concrete, aggregate and a lithium nitrate. Once the concrete mixture has been poured, the upper surface is floated or screed. Where aggregate has not been integrally mixed into the concrete mixture, the aggregate is surface seeded by broadcasting the aggregate upon the ASR resistant concrete surface. Thereafter, the concrete surface is troweled to embed the aggregate in the upper surface and provide a homogenous uniform surface. The aggregate is then exposed utilizing chemical retardants or mechanical apparatus.

Claims10

Dependent claims

A method of creating a surface seeded exposed aggregate concrete resistant to alkali silica reactivity, the method comprising:

(a) preparing a subgrade or formwork for concrete placement;
(b) preparing an integral alkali silica reactivity resistant concrete mixture by mixing a lithium nitrate solution with concrete in a ratio of two (2)-eight (8) gallons of 5-50% lithium nitrate solution with each cubic yard of concrete;
(c) pouring the alkali silica reactivity resistant concrete mixture upon the subgrade or within the formwork to create an exposed concrete surface;
(d) floating, screeding or troweling the concrete surface utilizing bull floats, screeds or trowels so that the concrete surface is consolidated and uniform, while in a plastic state;
(e) broadcasting an aggregate reactive to concrete upon the concrete surface;
(f) mixing the aggregate into the concrete surface by troweling or floating the aggregate into the concrete surface;
and
(h) exposing the aggregate within the concrete surface by either (1) applying a concrete surface retardant, allowing the retardant to retard hardening of a layer of the concrete, and washing away the surface retardant with water, or (2) mechanically exposing the aggregates utilizing abrasive mechanical apparatus to remove a surface layer of the concrete surface.

5 more elements

A method of creating an integrally mixed exposed aggregate concrete resistant to alkali silica reactivity, the method comprising:

(a) preparing a subgrade or formwork for concrete placement;
(b) preparing an integral alkali silica reactivity resistant aggregate seeded concrete mixture by mixing:
1) a lithium nitrate solution, 2) an aggregate reactive to concrete, and 3) concrete, and wherein the ratio of lithium nitrate solution to concrete is two (2)-eight (8) gallons of 5-50% lithium nitrate solution with each cubic yard of concrete;
(c) pouring the concrete mixture upon the subgrade or within the formwork to create a concrete surface;
(d) floating, screeding or troweling the concrete surface utilizing bull floats, screeds or trowels so that the concrete surface is consolidated and uniform, while in a plastic state;
and
(e) exposing the aggregate within the concrete surface by either (1) applying a concrete surface retardant to the concrete surface, allowing the retardant to retard hardening of the layer of the concrete, and washing away the surface retardant with water, or (2) mechanically exposing the aggregates utilizing abrasive mechanical apparatus to remove a surface layer of the concrete surface.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/373,335Filed 11 Nov 2011
Priority: 12 Nov 2010
Published: 17 May 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

E01C 7/142
Concrete paving: mixtures or their components, e.g. aggregate
C04B 22/085
Acids or salts thereof: containing nitrogen in the anion, e.g. nitrites
C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…
C04B 41/009
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone: characterised by the material treated