Simple, Low Cost, Rapidly Deployable System for Forming Ultra High Performance Concrete (UHPC) in the Field.

Award Information
Agency:
Department of Defense
Branch
n/a
Amount:
$150,000.00
Award Year:
2012
Program:
SBIR
Phase:
Phase I
Contract:
HDTRA1-12-P-0025
Award Id:
n/a
Agency Tracking Number:
T121--01-0018
Solicitation Year:
2012
Solicitation Topic Code:
DTRA121-01
Solicitation Number:
2012.1
Small Business Information
939 Luke Road, Sadieville, KY, -
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
800556040
Principal Investigator:
Thomas Robl
President
(859) 396-4331
tom.robl@nuformmaterials.com
Business Contact:
Thomas Robl
President
(859) 396-4331
tom.robl@nuformmaterials.com
Research Institute:
Stub




Abstract
We propose the development of a simple, low cost technology for the field placement of ultra-high performance concrete (UHPC) that consists of a modified Gunite system and an improved UHPC formulation. The Gunite system includes modifications that overcome a number of problems related to the delivery of UHPC via gunnite including dust suppression and nozzle plugging associated with rapid setting fiber reinforced cementitious materials. An atomized water mist is produced that is much more effective at wetting very fine particles essential to making UHPC, improving uniformity, eliminating rebound, and producing a very dense concrete with greatly improved strength. The new system autogenously cured needing no external source of heat. The improved UHPC formulation is based on a calcium sulfoaluminate (CSA)--Portland (OPC) blended cement, anhydrite, ultra-fine fly ash (UFA), Polyvinyl alcohol (PVA) fibers, steel fibers, a proprietary accelerator and graded quartz river sand. This formulation results in a much higher rate of strength development, as well as the prerequisite total strength. The UFA provides a strong pozzolanic component and contributes to the overall density and long term strength of the final UHPC. The UHPC gunnite formulation also has superior adhesion and bonding to a range of fibers and preexisting surfaces.

* information listed above is at the time of submission.

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