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You searched on: Author: Nicos Martys

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1. Metrology Needs for Predicting Concrete Pumpability
Published: 6/22/2015
Authors: Myoungsung Choi, Chiara F Ferraris, Nicos Martys, Didier Lootens, Van Bui, Trey Hamilton
Abstract: With the increasing use of pumping to place concrete, the development and refinement of the industry practice to ensure successful concrete pumping is becoming an important need for the concrete construction industry. To date, research on concrete pu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918500

2. Service Life Modeling of Reinforced High Volume Fly ash (HVFA) Concrete Structures Containing Cracks
Published: 5/1/2015
Authors: Scott Z Jones, Dale P Bentz, Kenneth Alan Snyder, Nicos Martys, Daniel S Hussey, David L Jacobson
Abstract: Chloride ions, resulting from the application of de-icing salts travel through the concrete matrix by diffusion in a connected pore network. Cracks in concrete facilitate chloride movement by allowing ions to bypass the concrete matrix and travel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918183

3. Research Needs to Advance Concrete Pumping Technology
Series: Technical Note (NIST TN)
Report Number: 1866
Published: 4/10/2015
Authors: Chiara F Ferraris, Nicos Martys, Myoungsung Choi, Van Bui, Trey Hamilton, Didier Lootens
Abstract: With the increasing use of pumping to place concrete, the development and refinement of the industry practice to ensure successful concrete pumping is becoming an important need for the concrete construction industry. To date, research on concret ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916377

4. Simulation Studies of Methods to Delay Corrosion and Increase Service Life for Cracked Concrete Exposed to Chlorides
Published: 2/18/2015
Authors: Scott Z Jones, Nicos Martys, Yang Lu, Dale P Bentz
Abstract: The ingress of chlorides in reinforced concrete leads to the onset of rebar corrosion and eventually compromises a structure‰s integrity. To extend its service life and improve safety, it is crucial to develop sound repair and rehabilitation stra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915420

5. Real-World Considerations for Predicting Service Life of Steel-Reinforced Concrete Exposed to Chlorides
Published: 9/1/2014
Authors: Dale P Bentz, W. Spencer Guthrie, Scott Z Jones, Nicos Martys
Abstract: The prediction of concrete service life is of paramount importance for upgrading our nation‰s built infrastructure. Although computer models for predicting the service life of reinforced concrete exposed to chlorides (e.g., road salts) have been deve ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915806

6. Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique
Published: 1/11/2014
Authors: Edward Joseph Garboczi, Paul E Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F Plusquellic, Jack T Surek, Sung Kim, Robert D McMichael, Mark D Stiles, Ahmed M. Hassan
Abstract: Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectrosc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914553

7. Measurement and Simulation of Millimeter Wave Scattering Cross-sections from Steel-Reinforced Concrete
Published: 1/11/2014
Authors: Ahmed M. Hassan, Edward Joseph Garboczi, Robert D McMichael, Jack T Surek, Mark D Stiles, David F Plusquellic, Virgil Provenzano, Paul E Stutzman, Shuangzhen S. Wang, Sung Kim, Michael D Janezic, Jason B Coder, Nicos Martys, David R Novotny
Abstract: Some iron oxide corrosion products exhibit antiferromagnetic magnetic resonances (AFMR) at around 100 GHz at normal temperatures. AFMR can be detected in laboratory conditions, which serves as the basis for a new non-destructive spectroscopic method ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914493

8. Development of Standard Reference Materials for Cement-Based Materials
Published: 1/6/2014
Authors: Chiara F Ferraris, Nicos Martys, William L George
Abstract: Rotational rheometers are routinely used for homogeneous materials, but their usage for characterization of a granular fluid like concrete is a relatively new phenomenon. As measurements with rheometers can involve flow in a complex geometry, it is ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914802

9. Development of Standard Reference Materials for Cement-Based Materials
Published: 5/13/2013
Authors: Chiara F Ferraris, Nicos Martys, William L George
Abstract: Rheometers are used to determine the rheological properties of materials ranging from mayonnaise to concrete. While rotational rheometers are routinely used for homogeneous materials such as mayonnaise, their usage for characterization of a granular ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912949

10. Modeling of the Influence of Transverse Cracking on Chloride Penetration into Concrete
Published: 4/23/2013
Authors: Dale P Bentz, Edward Joseph Garboczi, Yang Lu, Nicos Martys, Aaron Richard Sakulich, William Jason Weiss
Abstract: Concrete service life models have proliferated in recent years due to increased interest in designing infrastructure elements with at least a 75-year service life, along with greater emphasis on life cycle costing in general. While current models con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911669



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