Nondestructive Evaluation (NDE) Web Manual
The Federal Highway Administration of the US Department of Transportation published a handbook that summarizes the new non-destructive technologies for performance evaluation of bridges on its website. THASA was hired to draft a couple of chapters: Radiagraphy for Detecting Voids and Radiography for Profiling Tendons.
Works published in the book Anales de la Sociedad Científica Argentina
Patent granted in Europe
On September 9, 2015 the European Patent Office granted THASA’s patent identified by No. 2,081,496. THASA will apply for nationalizations of this patent in Germany, Great Britain and France.
Seminar on FADU
In the Faculty of Architecture, Design and Urbanism of the University of Buenos Aires a seminar on THA 3 was given for students and teachers of Structures 2 and 3.
23° AIE Conference
Presentation of the paper at the 23st Argentine Conference on Structural Engineering “THATIR inspection method for prestressing sheaths”.paper.
ASNT Conference in Washington DC
THASA presented the paper Determination of Grouting Defects in "Deep" PT Ducts Using Gamma Rays at the 2014 NDE / NDT for Highways and Bridges: Structural Materials Technology Conference of the American Society for Non-Destructive Testing held in Washington DC.
Lectures given in California
TASHA made presentations on their technology in California Caltrans’s officials (Department of Transportation of the State of California) and business professionals of MYERS & SONS.
Argentine Conference on Forensic Engineering
As part of the Argentine Conference on Forensic Engineering a lecture was given about THA and the use of gamma rays for nondestructive inspection of structures and monuments with emphasis on its applications.
Patent granted in China
On 5 March 2014 the Chinese Patent Office granted THASA the patent identified by No. 1,356,166.
THASA participated in this meeting via Skype on November 22. The discussion was about a draft for a manual on Integrity of PIT Foundations. It was decided that there will be a discussion on the norm for Reinforced Concrete Tomography in
THASAs President, Dr. Mario Mariscotti was invited to give a presentation at the Academy and
THASA presented the results of its new THATIR technique to detect and measure defects in post tensioning ducts inside of large reinforced concrete elements. Present at the meeting were 13 specialists of the Department of Transportation, of Simpson, Gumpertz and Heger of Massachusetts, of the Federal Highway Administration of Washington DC and of the
Technical visits to USF and Space Science Services
Mario Mariscotti visited the research group led by Professor Alberto Sagues at the
An important RCT inspection job in
Depth record in the detection of concrete reinforcements.
For the first time it was possible, by using THATIR, to determine the complete configuration of reinforcements located at a depth of one meter in a reinforced concrete structure without access from below.
Visit by Professor Alberto Sagues
On September 18th Dr. Alberto Sagues, professor at the University of South Florida, visited THASA to discuss recent results of studies on defects in post tensioning ducts, voids and corrosion. Professor Sagues was in
A THASA patent is highlighted by INPI
INPI, the National Institute of Industrial Property of Argentina published a book entitled Industrial Property and Development, the Key is in the Link. THASAs patent of 5 December 2007 is listed as one of the 12 most successful patents for the decade 2003-2013. At Tecnpolis, the great Buenos Aires exhibition on science, technology and art, this patent is displayed together with other five.
Lecture at the Academia Nacional de Ciencias of Buenos Aires
On the 27th. at the invitation of this institution, Dr Mariscotti delivered a lecture entitled: Nuclear Physics in Civil Engineering; the case of Reinforced Concrete Tomography.
In this year we emphasize the expansion of our business in Brazil together with our partner, Arctest; THASAs contribution in providing reliable information for the many at risk balconies in the city of Buenos Aires; the extensive use of RCT for the inspection of bank treasuries, and the successful development of a modified THATIR technique for detecting defects in ducts for post tensioning following requests from US institutions.
Lectures on RCT in Rio der Janeiro
Given on December 10 at the Clube de Engenharia, the 11th at the Facultade de Engenharia of Federal University of Rio de Janeiro and on the 12th at the Instituto de Engenharia Legal of Brazil.
December 2012 to May 2013
Contract with Simon, Gumpertz & Heger of
This large engineering corporation turned to THASA to investigate the possibility of finding filling defects in deep prestressed ducts. THASA developed a computer model and performed successful measurements on a specially fabricated sample with a modified version of their THATIR instrument. This success led to a contract with SGH for measurements on 6 samples with various types of simulated defects prepared by that company. It was shown that the THATIR satisfies the requirements for these inspections. The locations of the boundaries between grouts of different densities were measured with a
Teixeira Duarte performs RCT tests on large thickness samples
This Portuguese enterprise, associated with THASA since april 2011, acquired a cobalt source and fabricated
Consagracin (public recognition) prize by the Sociedad Cientfica
Granted to THASAs President, Mario Mariscotti, for his technological contributions.
Lecture on Gammagraphy in Civil Construction
THASA was invited to give this lecture by Eng. Humberto M. Balzamo of the Departamento de Materiales y Estructuras de
Consultation by Oderbrecht in
At the invitation by Eng. Antonio Franca of that enterprise, Mario Mariscotti visited bridge III over the
Lectures given in Brazil
On the 27th, invited by the Instituto de Engenharia de
Framework agreement signed for collaboration with INVAP
This agreement stipulates that INVAP can entrust THASA with the study and solution of certain problems for which THASAs competencies are appropriate. It also stipulates that both companies jointly can carry out service contracts utilizing THASAs technology.
Training course for ARCTEST personnel
Marcelo Ruffolo of THASA gave a training course at Paulinas,
Working meetings in Brazil
Mario Mariscotti traveled to
Invitation by INVAP
During a three day visit to this high technology company in
Patent granted in Mexico
On August 30, 2012 the Instituto Mexicano de la Propiedad Industrial granted THASA the patent identified by No. 302854.
Lecture on Tomography at the
Mario Mariscotti was named official visitor (resolution 542/2012) by the
First inspection job in Brazil
The first Reinforced Concrete Tomography (RCT) inspection under the THASA-ARCTEST agreement was carried out at a commercial center in the state of
Lectures on Reinforced Concrete Tomography
THASA gave a course on this subject at the Jorge Sciammarella auditorium of the Consejo Profesional de Ingeniera Civil of Argentina on May 8 and 18.
Collaboration agreement with ARCTEST, Brazil
A collaboration agreement was signed with the ARCTEST Corporation of
Patent granted in Japan
The Japan Patent Office granted THASA the patent 4969656 on April 12. The expiration date of this patent is October 31, 2027.
Honoris Causa Doctorate
THASAs president, Dr. Mario Mariscotti received the title of Doctor Honoris Causa from the Universidad Nacional de San Martn,
Patent granted in U.S.A.
The United States Patent and Trademark Office granted THASA patent US 8,064,571 B on November 22, 2011. The authors of this patent are P. Thieberger, M. Mariscotti, M. Ruffolo and T. Frigerio.
In the framework of a collaboration agreement with Instituto de Investigaciones y Ensayos de materiales (IDIEM) of University of Chile to apply THASA technology in Chile, a service job was carried out in a mine near the northern city of Iquique. This work entailed the study of anchorage elements holding rails under several reinforced concrete floors in Compaa Minera Doa Ins Collahuasi.
THASA signed a cooperation agreement with TEIXEIRA DUARTE, by which TEIXEIRA DUARTE assumes the execution of the field jobs as part of the full Reinforced Concrete Tomography services carried out in Portugal, Spain, Angola, Mozambique and Algeria with exclusivity and in Brazil without exclusivity. THASA keeps the responsibility for data analysis, tomographic results and issuing the respective Technical Reports.
THASA participated in Reabilitar Conference 2010 held in Lisboa, Portugal, on June 23 to 25. The paper entitled Desenvolvimento e aplicaao da tomografia por raios gama na inspecao de estruturas de engenharia civil, is coauthored by Mrio Pimentel and Joaquim Figueiras from School of Engineering, University of Oporto, Department of Civil Engineering, LABEST, Porto and Mario Mariscotti, Peter Thieberger, Teresita Frigerio and Marcelo Ruffolo of THASA, and describes the development and application of RCT in civil engineering structures.
THASA participated in Structural Faults & Repair-2010 Conference held in Edinburgh, United Kingdom on June 15 to 20. The paper entitled Gamma-ray inspection of post tensioning cables in a concrete bridge is coauthored by Mrio Pimentel and Joaquim Figueiras from School of Engineering, University of Oporto, Department of Civil Engineering, LABEST, Porto and Mario Mariscotti, Peter Thieberger, Teresita Frigerio and Marcelo Ruffolo of THASA, and presents the application of RCT in the non-destructive evaluation of condition and internal distribution of post-tensioned girders in N. S. da Guia bridge, Portugal.
THASA in Chile
As member of the commercial mission organized by the Ministry of Foreign Relations of Argentina, THASA held a number of meetings with businessmen and entities of Chile. Much interest was consistently expressed in the application of the RCT method in connection with the damage suffered during the recent earthquakes . As a result THASA is currently holding discussions with some local organizations aimed at providing services taking advantage
The article entitled Gamma-Ray Imaging for Void and Corrosion Assessment was published in Concrete International, November 2009, Vol. 31 No. 11 pp. 48-53. The article is Coauthored by Mario Mariscotti of THASA, Frank Jalinoos of the Federal Highway Administration, Teresita Frigerio, Marcelo Ruffolo and Peter Thieberger also of THASA, and presents a description of THASA technology and its utility in the specific case of void and corrosion detection in post-tensioned girders. The electronic (PDF) version of this article is available for purchase and download in the magazine web page an includes additional information of an application case.
March 12, 2009
In collaboration with researchers at the University of Oporto a paper has been submitted to the ASCP09 1st Congress on Bridge Safety and Conservation ASCP to be held in Lisbon on next July 2 and 3. The paper entitled Non destructive inspection of pre-stressed ducts and cables in N.S. da Guia Bridge using gamma-ray tomography is coauthored by Mrio Pimentel and Joaquim Figueiras from School of Engineering, University of Oporto, Department of Civil Engineering, LABEST, Porto and Mario Mariscotti of THASA, and presents results of extended studies carried out in the above mentioned bridge, including THASAs Reinforced Concrete Tomography (RCT) technique for inspection of its pre-stressed girders.
THASAs Real Time Tomograph (THATIR) was successfully applied to detect steel bars in the center of a 0.55 m (21.6 in) thick concrete sample (density 2000 Kg/m3,125 lb/ft3) with a low intensity Ir source (16 Ci). It is known that in conventional industrial radiography which captures data on photographic or digital plates, Ir sources cannot be used for inspecting concrete pieces thicker than about 0.3 m (1 ft). Instead of photographic plates, THATIR uses a highly efficient gamma-ray spectrometer capable of both detecting very low gamma fluxes and filtering most of the unwanted scattered radiation. These measurements were prompted by a customer need for precisely locating pre-stressed ducts in 0.46 m (18 in) thick girders.
All claims in THASAs new patent PCT International Application have been fully accepted and held patentable by the US Patent and Trademark Office. This patent involves 21 claims which cover all aspects of the last generation gammagraphy tomograph developed by THASA. The system includes features that provide improved precision for the 3D reconstruction analysis of steel bars in reinforced concrete as well as better image quality.
The condition of ducts in pre-stressed girders was studied with gamma rays in the bridge N. S. da Guia next to the town of Ponte da Lima in Portugal. The work was carried out in collaboration with a group from the University of Oporto lead by Profs. Joaqum Figueiras and Mario Pimentel. Gammagraphies were obtained in different locations of the bridge floor and web with the main objective of inspecting the ducts in these locations. A relatively low intensity Ir source (20 Ci) was used in conjunction with THASA equipment. A special tool was designed and constructed to position the source below the bridge floor using previously made holes, thus avoiding expensive scaffoldings either hanging from the bridge or sitting on the river bed below the bridge. The result was a successful non-destructive test, clearly showing the current condition of the ducts.
ASNT Oakland Conference
THASA presented detailed results of void detection in pre-stressed girders. These were results obtained earlier at the Zarate Brazo Largo Bridge in Argentina. The measurements were carried out in one of the large girders in this bridge with a Ir source. As a result several locations with defective grouting were identified. The analysis of the most severe of these cases was discussed in detail in the presentation, showing that, in addition to the tomographic results (position and size of ducts, cables and rebars) it is also possible to obtain precise information on the extension of the voids and corrosion, from these gammagraphies. The talk resulted in a number of focused and relevant questions from the audience, indicating that the detection of defects in PT girders is an important cause of current concern worldwide.
June 10, 2008
The paper presented by THASA was recognized as one of the three best in the NDT area. This paper includes results from four different customer projects: 1) Zarate Brazo Large Bridge (which elicited the invitation to present a paper at the ASNT Conference in Oakland see previous item); 2) Underwater studies carried out in Ushuaia Harbor (Tierra del Fuego); 3) Detection of termite produced voids in wooden beams in a historical Jesuit chapel in Crdoba, built in 1660 and declared by UNESCO patrimony of mankind. This work is the first application of gamma rays to a hitherto untapped area in the NDT field; and 4) Results from a test done in the UK in collaboration with Atkins Engineering of Birmingham for the Highways Agency proved the ability of THASA techniques to detect corrosion in dowel and scissor bars in hinges of bridge decks.