News from Vector Corrosion Technologies
NEW Galvashield XP Anodes Now Available!
Vector Expands the Use of Galvashield® One-and-Done™ Single Wire Rebar Connection for Concrete Anodes
January 19, 2018 – Vector Corrosion Technologies is pleased to announce that it is expanding the use of its contractor-friendly One-and-Done™ single wire connection for the attachment of Galvashield® embedded galvanic anodes to reinforcing steel in concrete repairs and new construction.
Originally developed in the UK, Galvashield XP is the original galvanic anode for concrete and has been protecting structures around the world for over 20 years. One of the novel features of the Galvashield XP anode was its twin steel tie wires to make quick and secure connection to reinforcing steel without the need for welding.
Vector first introduced the single wire One-and-Done connection technique in 2015 with the launch of Galvashield XP Compact for the building and parking market.
The three primary features of the Galvashield One-and-Done connection are:
- Fast installation – Galvashield anodes are installed up to 2 times faster than the original two-wire method. This means significantly less labor costs and more efficiency for the contractor’s schedule.
- Simple – No special tools are required.
- Lower cost - The new anode design allows more anodes per package reducing shipping cost and reduced packaging waste for disposal.
In 2018, Vector will begin to supply Galvashield XPT with the One-and-Done connection and more products will be available in the future.
Watch the One-and-Done anode connection in action versus the traditional two wire connection on YouTube at:
At Vector Corrosion Technologies, saving structures is what we do. With the largest range of cathodic protection technologies and services to control concrete corrosion, Vector offers innovative solutions for most every budget and service life objective. For more information, contact your Vector Corrosion Technologies at firstname.lastname@example.org.
The Condition of Post-Tensioned Concrete Bridges
In major upgrades and extensions of highway networks over the past sixty years, the use of post-tensioned concrete has been found to be an economically competitive form of construction. However, unexpected deterioration of post-tensioned concrete structures became a major concern in many countries, despite well-established design and construction practices. As a consequence, significant expenditure had to be diverted from capital works to the management of those structures.
In the United Kingdom a programme of Post-Tensioned concrete bridge Special Inspections (PTSIs) was proposed in 1993 and substantially undertaken in the 1990s/2000s. A review of the results of investigations (Woodward, R 2001) reported that the condition of post-tensioning systems was generally satisfactory although ducts in many bridges contained voids and light corrosion of tendons. Approximately 10 percent of bridges were less satisfactory and needed remedial works. Other bridges were likely to need attention in the future. It was considered that construction detail and practices were the major factors affecting deterioration of post-tensioned concrete bridges, with the integrity of the grouting being of prime importance.
Since the PTSI programme, there has been a reliance on Principal and General Inspections to identify signs of deterioration, but experience has shown that these inspections generally cannot identify the internal condition of the post-tensioning systems, with the result that the level of uncertainty about the condition of ducts, grout and tendons increases with time. The higher risk bridges need monitoring and re-investigation.
In February 2015, ”BD 54/15 Management of post-tensioned concrete bridges” was issued, the Standard providing a process of risk review, risk assessment and risk management for bridges and included advice on activities, such as Special Inspections, monitoring, repairs and strengthening, that would assist bridge managers in making decisions as to when to undertake further investigations and when to use other risk management measures. This Standard has proven to be of significant benefit to bridge managers.
About the Author: Dr Donald Pearson-Kirk is currently Structures Technical Director for the Mouchel Structures Investigation Group (SIG) based in Exeter. Donald has worked as a technical advisor to numerous international agencies and governments, and is the author/co-author of over 280 technical papers. He has directed the investigations to over 340 post-tensioned bridges in the UK, Europe, the Middle East and in the United States, including the Charles River Bridge in Boston, Massachusetts, and the Hammersmith Flyover in London. Members of the SIG team from 2012 assisted Kier Highways staff in the trialling of the draft Standard BD 54/XX on 10 post-tensioned bridges.
Vector Presenting at M&CCE Expo
If you are attending the Marine & Coastal Civil Engineering Conference, and you have an interest in durability of marine structures, stop by Vector Corrosion Technologies' stand.
VCT, based in Cradley Heath, West Midlands, offers innovative solutions for corrosion repair including galvanic cathodic protection pile jackets, distributed and discrete galvanic anodes for concrete repair, and impressed current cathodic protection systems.
Marine & Coastal Civil Engineering 2016 is the UK's leading event in presenting global solutions and innovative concepts to professionals working in hard engineering, coastal and river management, subsea engineering and flood risk authorities.
The M&CCE conference is held 12-13 October, 2016 at ExCeL, an exhibitions and international convention centre in the London Borough of Newham.
KBC Tower - Steel Frame ICCP
In the January/February issue of ICRI's Concrete Repair Bulletin, the repair and cathodic protection of the KBC Tower was profiled. KBC Tower, known locally as the Boerentoren, was the largest steel frame building in Europe when it was opened in 1930. The ICCP project, which occurred from March to December 2014, covered approximately 25% of the surface area of the building and utlized Vector's Ebonex ICCP anodes. For more information, the article can be found HERE.
VCT Claims Two Awards for Concrete Repair Excellence, October 21, 2015
Vector Corrosion Technologies (VCT) was pleased to be recognized for two recent concrete repair projects at last week's International Concrete Repair Institute (ICRI) 2015 Awards gala at the Fort Worth Hilton. The objective of the ICRI award program is to recognize outstanding concrete repair projects from around the world.
Strengthening of Grinding Building Slab at Batu Hijau Copper-Gold Mine
2015 ICRI Award of Excellence - Industrial Category
While working at the Batu Hijau Copper-Gold mine in Indonesia, Vector was asked to provide a recommendation for a heavy duty elevated slab that was experiencing major concrete cracking. Vector's investigation, which included a GPR survey, revealed the concrete reinforcing steel was installed incorrectly.
Vector devised a concrete slab strengthening plan that utilized carbon fibre reinforced polymer tape (CFRP) placed in slots near the slab surface, verified the strengthening solution in large scale laboratory testing, and implemented the repair with its local partner.
Structural Repair & Protection of Post-tensioned Parking Garage at University of Missouri Hosptials and Clinics
2015 ICRI Award of Merit - Parking Category
A unexpected tendon eruption in a 1986 vintage parking deck lead to a comprehensive evaluation which determined a large percentage of the push through (stuffed) post-tensioned tendons were broken. A large majority of the post-tensioned tendons also had missing or degraded post-tensioning grease, a problem that was exacerbated by a gutter system that trapped moisture and debris below failed expansion joints.
As part of a major rehabilitation program, post-tensioning tendons that were treated with Vector’s Post-tech PT Cable Drying system were then injected with corrosion inhibiting grease to provide a long lasting innovative solution.
For more information about Vector's award winning concrete repair and concrete corrosion solutions, contact us at email@example.com.
Post-tension Impregnation System Featured in PTI Journal
In the PTI Journal case study "TENDON IMPREGNATION TECHNOLOGY MITIGATES CORROSION AND PROTECTS POST-TENSIONED TENDONS", the authors describe how Vector's Post-tech PTI Post-tension Impregnation process improves the corrosion resistance of grouted or bonded post-tension tendons. The article describes the process and summarizes testing completed at Vector's Winnipeg Development Centre and by the Florida Department of Transportation.
CORROSION MITIGATION OF PRECAST CONCRETE PARKING GARAGES
Precast concrete structures can be susceptible to premature corrosion-related deterioration, resulting in higher maintenance costs. In a recently published article in Concrete Repair Bulletin, Tore Arnesen and Leo Whiteley presents techiques to mitigate corrosion, minimize maintenance, and extend service to existing and new precast concrete parking garages.
David Whitmore Presents ACI Repair Application Procedure (RAP) 8 - Installation of Embedded Galvanic Anodes
Mr. David Whitmore, President of Vector Corrosion Technologies, presents the updated ACI Repair Application Procedures for Installation of Embedded Galvanic Anodes (ACI RAP - 8). The video can be found HERE on ACI's YouTube Channel. Engineers can also review this document to receive on-line CEU's on the ACI Website.
Using Galvanic Anodes and Shotcrete Repairs to Mitigate Corrosion
Shotcrete is a commonly used method for repairing corrosion damaged structures. Check out this American Shotcrete Association article in Shotcrete magazine on how to incorporate embedded galvanic anodes to extend the life of shotcrete repairs.
Vector opens Cradley Heath Research Centre
In 2014, Vector completed the purchase and renovation of a 324 m2 facility in the UK to create the Cradley Heath Research Centre. Under the direction of Dr. George Sergi, the primary focus of this to facility is to research new and innovative approaches to control corrosion in structures. This facility compliments the existing Winnipeg Development Centre which primarily focuses on product development and technical product support.
Corrosion Control Implemented on UK Multi-storey Car Parks, David Simpson 2012
With over 4000 multi-storey car parks in operation, many built without recognising their harsh environmental conditions, the United Kingdom has become a leading user of technologies to address chloride-induced corrosion of reinforced concrete.
Over the past 10 years, corrosion testing has become a standard process in the evaluation of concrete structures (e.g. BRE Digest 444 part 2) and full half-cell corrosion potential mapping is being used more frequently to assess the risk of corrosion, which in practice can vary greatly over the cark park structure.
After identifying the areas of high corrosion risk by corrosion potential testing (such as low cover concrete and high chloride concentrations), a corrosion control strategy can be implemented to target these areas using embedded galvanic anodes, an increasingly utilised technique over the past 12 years. Galvanic anodes, combined with waterproof coatings which reduce moisture content and create a barrier for future chloride contamination, deliver cost effective corrosion control that will substantially impact the service life of cark parks.