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Chiara F. Ferraris, H. R. R. Hamilton, Alexander Piper
This report contains a summary of the research performed to develop a replacement for the high-temperature grout fluidity (HTGF) test. The HTGF test was employed in the past by FDOT to qualify post-tensioning (PT) grouts for use in post-tensioned bridge
Robert Spragg, Scott Jones, Kenneth A. Snyder, Dale P. Bentz, Chiara Villani, Jason Weiss
Electrical measurements are becoming a common method to assess the transport properties of concrete. For a saturated homogenous system, the surface resistance and the uniaxial resistance measurements provide equivalent measures of resistivity once geometry
Nanoparticles are increasingly incorporated in flooring coatings and interior paints to improve their abrasion and microbial resistance. One particular concern of this application is the release of nanoparticles from these surfaces due to repeated
Because ready-mixed concrete is placed under a wide variety of environmental conditions, the influence of temperature on the hydration reactions and the accompanying setting (hardening) process is of critical importance. While contractors are generally
Dale P. Bentz, Kenneth A. Snyder, Amzaray M. Ahmed
One common concern limiting the proliferation of high-volume fly ash (HVFA) concrete mixtures is the significant delay in setting that is sometimes encountered in field concrete mixtures. While several methods to mitigate the delayed setting times of HVFA
The Bogue calculations of cement composition are used for manufacturing process control and cement classification. While it is commonly understood that the Bogue calculations are estimates with potential intrinsic biases, the magnitudes of such biases are
Yaghoob Farnam, Dale P. Bentz, Aaron R. Sakulich, Daniel R. Flynn, Jason Weiss
Deicing salts are often applied to the surface of pavements and bridge decks in the winter to melt ice; thereby improving safety for the travelling public. In this paper, the influence of NaCl deicing salt on freezing and thawing temperatures of pore
Chun-Chieh Tien, Ching-Hsuan Chang, Bernard Hao-Chih Liu, Deborah Jacobs, Savelas A. Rabb, Lee L. Yu, Tinh Nguyen, Li Piin Sung
Polymer nanocoatings are increasingly used outdoors and in harsh environments. However, because most common polymers degraded by the weathering elements, nanoparticles in polymer nanocoatings may be released into the environments. Such nanoparticle release
Scanning Electron Microscopy (SEM) and Confocal Raman Microscopy (CRM) were employed to characterize the 3D state of disperison of carbon nanotubes (CNT) in a polymer matrix. First, non-destructive subsurface imaging on CNT-polymer was conducted by charge
Li Xiong, Laken Kendrick, Hannele Heusser, Bradley J. Sparks, Christopher Stafford, James T. Goetz, Sergei Nazarenko, Derek L. Patton
Superamphiphobic surfaces, exhibiting high contact angles and low contact angle hysteresis to both water and low surface tension liquids, have attracted a great deal of attention in recent years due to the importance in many practical applications. In this
Yu-Chin Li, Yeon S. Kim, John R. Shields, Rick D. Davis
Layer-by-Layer (LbL) assembled multilayer thin films of deoxyribonucleic acid (DNA), chitosan (CHI), and montmorillonite (MMT), were studied in an effort to produce fully renewable, bio-based fire retardant coatings for flexible polyurethane foam. The PUF
Conjugated polymers are attracting worldwide attention due to the cost-effective and low thermal budget processing traits of plastics combined with their potential as the active layer in advanced electronic, optoelectronic and energy harvesting
Edward Garboczi, Rolands Cepuritis, Borge Wigum, Ernst Mortsell, Stefan Jacobsen
Characteristics of fine particles (fines, 0 μm to 125 μm) from seven different crushed and natural sands from five different Norwegian rock types were determined. The results suggest that the same water absorption values, as determined by EN 1097-6 on
Li Piin Sung, Deborah S. Jacobs, Justin M. Gorham, Savelas A. Rabb, Xiaohong Gu, Lee L. Yu, Tinh Nguyen
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in
Robert Spragg, Yiwen Bu, Kenneth A. Snyder, Dale P. Bentz, Jason Weiss
These projects examined the potential for using electrical testing on concrete as a potential surrogate for obtaining information on ion and fluid transport. Electrical measurements are particularly attractive for use in quality control as they are easy to
Dale P. Bentz, Jeffrey M. Davis, Max A. Peltz, Kenneth A. Snyder
Sulfate attack is one of the common degradation mechanisms for concrete in severe environments. While various strategies for minimizing sulfate attack are well recognized, including using an ASTM C150 Type V cement and/or reducing water-to-cementitious
Christopher C. White, Kar T. Tan, Donald L. Hunston, Justin M. Gorham, Aaron M. Forster, Vogt D. Bryan
The durability of adhesive joints in hostile environments is a major area of concern in structural adhesive bonding. Therefore, understanding the mechanics and mechanisms of degradation of adhesive joints is a key factor for more extensive use in future
Quantitative x-ray powder diffraction analysis (QXRD) is being used within the cement industry for phase characterization of hydraulic cement. The current ASTM standard test method for powder diffraction analysis of cements provides guidance, but not an
Edward J. 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
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 spectroscopic
Ahmed M. Hassan, Edward Garboczi, Robert McMichael, Jack T. Surek, Mark D. Stiles, David F. Plusquellic, Virgil Provenzano, Paul E. Stutzman, Shuangzhen S. Wang, Sung Kim, Michael D. Janezic, Jason Coder, Nicos Martys, David R. Novotny
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 for
Chiara F. Ferraris, Nicos Martys, William L. George
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
Alejandro Duran-Herrera, Jose M. Mendoza-Rangel, Edgar de los Santos Rodriguez, Francisco Vazquez, P Valdez, Dale P. Bentz
In many parts of the world, corrosion of reinforcing steel in concrete induced by carbonation of the concrete continues to be a major durability concern. This paper investigates the accelerated and natural carbonation resistance of a set of 7 concretes
Carbon fiber reinforced polymer composites (CFRPC) are of great interest in the aerospace and automotive industries due to their exceptional mechanical properties. Carbon fibers are typically woven and inter-laced perpendicularly in warps and wefts to form
Kenneth A. Snyder, Li Piin Sung, Geraldine S. Cheok
Nondestructive test (NDT) methods and sensor technologies are evaluated in the context of providing input parameters to service life prediction models for reinforced concrete structures. Relevant NDT methods and sensors are identified that are based on
Mauro Zammarano, Szabolcs Matko, William M. Pitts, Douglas M. Fox, Rick D. Davis
Smoldering poses a severe fire hazard due to the potentially lethal amount of toxic carbon monoxide released, and the possibility to reach flashover (through transition from smoldering to flaming) with heat sources otherwise too weak to directly induce