PAVEMENT OVERLAY MATERIAL AND METHOD

• US 20110189456A1
• Filed: 02/02/2011
• Published: 08/04/2011
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: Pavement Surface Coatings, LLC
• Original Assignee: Pavement Surface Coatings, LLC
• Inventors: Reck, Nicholas
• Granted Patent: US 8,784,557 B2
• Time in Patent Office: Days
• US Class Current: 428/220
• CPC Class Codes: C04B 14/06 Quartz; Sand
• CPC Class Codes: C04B 16/0633 Polypropylene
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 20/0076 characterised by the grain distribution
• CPC Class Codes: C04B 2103/20 Retarders
• CPC Class Codes: C04B 2111/0075 for road construction
• CPC Class Codes: C04B 2111/60 Flooring materials
• CPC Class Codes: C04B 22/124 Chlorides of ammonium or of the alkali or alkaline earth metals, e.g. calcium chloride
• CPC Class Codes: C04B 24/2623 Polyvinylalcohols; Polyvinylacetates
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 40/0608 Dry ready-made mixtures, e.g. mortars at which only water or a water solution has to be added before use
• CPC Class Codes: E01C 11/005 Methods or materials for repairing pavings E01C7/35 takes precedence; for concrete coverings E01C7/147; for bituminous coverings E01C7/187; devices for repair works E01C23/06; repairing bridge floorings E01D22/00
• CPC Class Codes: E01C 7/147 Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering applying thin surface layers with other binder E01C7/35; repairing pavings in general E01C11/005; roughening by means of tools E01C11/24
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A mix design for a polymer modified cement pavement overlay is disclosed along with a method of making and using the mix on a variety of pavement substrates. The mix includes a specific dry combination of: finely divided Elotex 2311 and 2322 or 2320 polymers; Type 2 or C144 aggregate or equivalent; Type I/II cement; Type F or Type C fly ash; intermediate length polymer microfibers; plasticizer; (optionally) calcium chloride or equivalent; (optionally) quikrete retarder or equivalent; and water. The mixture is combined and applied to the substrate in depths of about ⅛ to about 1 inch in lifts. The mixture is allowed to cure for 3-4 hours before being returned to traffic. The placed mixture exhibits preferred qualities of substrate adhesion, flexibility, tire friction, and wearability.

Claims

1. A polymer modified cement pavement overlay mixture, comprising by weight:

Elotex 2211 polymer about 0.5% to about 1.0%;

Elotex 2322 or 2320 polymer about 3.0% to about 3.5%;

Type 2 or C144 or equivalent aggregate about 49% to about 59%;

Type I/II cement about 15% to about 25%;

Type F or Type C fly ash about 1% to about 11%;

polypropylene microfibers, about ⅜

to about 1½

inches long, about 0.8% to about 1.16%; and

,

water about 11% to about 21%.

2. A mixture as in claim 1, further comprising:

calcium chloride or equivalent accelerator about 0.01 to about 10% blended with a quikrete retarder or equivalent retarder about 0 to about 5%.

3. A method of making a cement pavement overlay mixture, comprising the steps of:

combining Elotex 2211 polymer about 0.5 to about 1.0%;

Elotex 2322 or Elotex 2320 polymer about 3% to about 3.5%;

Type 2 or C144 or equivalent aggregate about 49% to 59%;

Type I/II cement about 15% to about 25%;

Type F or Type C fly ash about 1% to about 20%;

Hardtflow about 0 to 2%; and

, Polypropylene microfibers about ¼

to about 1½

inches long, about 0.08% to about 1.16% in a dry form blend; and

,

adding said dry blend to a mixing machine containing water apportioned as about 11% to about 21%, all said percentages being by weight of said overlay mixture; and

,

mixing for more than 5 minutes.

4. A method as in claim 3, further comprising the step of:

testing said mixture following mixing for flowability in a standard ASTM flow meter cone test such that time required for passthrough is consistently between 5 and 60 seconds.

5. A hardened pavement overlay, comprising:

a ⅛

to 1 inch thick, screed placed, and 4 hour cured mixture, including, by weight prior to placement, Elotex 2211 polymer about 0.5% to about 1.0%;

Elotex 2322 or 2320 polymer about 3.0% to about 3.5%;

Type 2 or C144 or equivalent aggregate about 49% to about 59%;

Type I/II cement about 15% to about 25%;

Type F or Type C fly ash about 1% to about 20%;

Hardtflow about 0 to 2%;

polypropylene microfibers, about % to about 1½

inches long, about 0.8% to about 1.16%; and

,

water about 11% to about 21%.

6. A hardened pavement overlay as in claim 5, further comprising by weight prior to placement:

calcium chloride or equivalent accelerator about 0.01 to about 10% blended with a quikrete retarder or equivalent retarder about 0 to about 5%.