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technologieS
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Surtreat
- Concrete Restoration & Protection System
The Need
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| Reinforcing
steel corrosion is the most common cause of failure
of concrete structures. Once started, rebar corrosion
can not be stopped by simply waterproofing the
surface of the concrete.
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The corrosion
process is influenced and promoted by penetration of
air, water, chloride and an acid environment. Surtreat
can be used to prevent contamination and decomposition
of concrete surfaces in hostile, chloride and acid containing
environments. |
The
Technology
Surtreat is a proprietary concrete
restoration and protection system. The system includes
sequential application of chemical treatments to improve
the properties of the deteriorating concrete and protect
new structures. Surtreat proprietary chemical formulations
penetrate into the concrete microstructure in liquid
and vapor state to combine with the cement phase of
concrete and deposit on steel components. Surtreat increases
the ability of concrete to resist deterioration by increasing
compressive strength, reducing permeability, inhibiting
corrosion of the reinforcing steel components and improving
concrete's resistance to acid attack. Surtreat is used
in the widest variety of applications and every owner/manager/operator
of structures that include concrete components can benefit
from the installation of Surtreat.
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Untreated Lanes
(LEFT) vs. Treated Lanes (RIGHT) |
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All tests were conducted at the NASA Kennedy Space Center
laboratories and in compliance with applicable ASTM
Standard Test Methods. The evaluation methods employed
by NASA specialists included measurement of half-cell
potential, corrosion current and polarization resistance.
The most direct measure of the corrosion rate, polarization
resistance was increased by 300% after application of
Surtreat. Half-cell potential and corrosion current
measurements also reflect a significant decline in corrosion
rates after application of Surtreat corrosion inhibitors.
Status
Korhonen et al. (1996; 1997)
examined both products, and indicated that, with the
proper dosages and formulation of various chemicals,
the freezing point of concrete could be reduced and
strength development at low temperature could occur
at an acceptable rate without using external protection.
Recently, the Cold Regions Research and Engineering
Laboratory (CRREL) presented research results on chemical
admixtures that allow concrete to be placed when its
internal temperature is well below the freezing point
water (Korhonen 1998, 2002).
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| Project |
Surtreat Cost |
Alternative
Cost* |
| Allright Parking
Columbus, OH, Parking structure rehabilitation,
1990 |
$173,500 |
$1.4 mil |
Port Authority City of Pittsburgh,
PA, Bridge foundation restoration, 1991 |
$32,000 |
$240,000 |
| DOE Fermco Nuclear site, Fernald OH, Storage Pad
Protection, 1995 |
$170,000 |
$510,000 |
| Essex Waste Management Warehouse Floor Protection,
1996 |
$31,617 |
$250,000 |
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*Since
the projects described above were performed by Surtreat
Corp., "Alternative Cost" describes the restoration
estimate based on an engineering study or the lowest
bid.
The Benefits
The performance of Surtreat has been verified
on numerous projects as well as through extensive independent
laboratory testing. The results of the testing reflect
the following:
- Compression Strength - ASTM (American Society
for Testing Materials) C-42 increased by 300 to
2,000 psi depending on original strength and number
of applications.
- Water Penetration Reduction - 100% resistance
after 14 days exposure to 6 inch column of water.
75% resistance after 28 days exposure to 6 inch
column of water. 90% resistance after 24 hours when
100 psi is applied.
- Freeze Thaw Resistance - ASTM C-672 -50 cycles
with no surface loss. AASHTO (American Association
of State Highway and Transportation Officials) T-161
- 146 cycles with no surface loss.
- Chloride Penetration Resistance - AASHTO T-250
-30% decrease at 1 inch depth.
- Water-soluble Chloride Reduction - Reduced by
58% and 67% at 1 and 2 inches, respectively.
- Increase in Hardness - ASTM C-418 - 14% increase
in hardness of new concrete. ASTM C-414 - 64% increase
in hardness of deteriorated concrete. ASTM C-501
- 1,000 cycles with a 38% increase in wear index.
- Reduced Rebar Corrosion Potential - ASTM C-876
- Half cell potential showed a reduced voltage by
70% in 14 days (0.8 to 0.3)
- Increased Surface Adhesion - No failure of epoxy
bonded to treated surface.
- Reduced Chemical Reactivity - Resists reaction
with concentrated hydrochloric acid
- Flexural Strength - Increased from 423 to 543
psi.
- Increases pH Level - Edges of concrete increased
from 5 to 9, center of concrete increased from 9
to 12
Status
Some of the major markets/industries being serviced
by Surtreat Corp. include: parking, utilities –
electric/sanitary/water, bridge/road construction/maintenance,
airports, hazardous/nuclear materials storage/disposal,
waste management, real estate management. With the usage
in above table, Surtreat is also used at NASA for shuttle
launch pad restoration.
Barriers
Surtreat has to be applied at temperatures above freezing.
Surtreat application requires a clean surface.
Previously applied sealers, curing compounds and coatings
have to be completely removed to open concrete porosity.
If original construction included admixtures in high
proportion (such as GGBFS, etc.) sample evaluation may
be required to specify proper treatment.
Points of Contact
Mr. Anthony Fiasco,
437 Grant Street, 1210 Frick Building,
Pittsburgh, PA 15219.
Tel: (412) 281-1202,
Fax: (412) 281-1282,
E-Mail: surtreat@nauticom.net
References
- http://www.new-technologies.org/ECT
- Surtreat
Corporation
- National
Aeronautics & Space Administration - News
Lease
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