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Author: dale bentz

Displaying records 31 to 40 of 185 records.
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31. Influence of Particle Size Distributions on Yield Stress and Viscosity of Cement-Fly Ash Pastes
Published: 2/1/2012
Authors: Dale P Bentz, Chiara F Ferraris, Michael A Galler, John Guynn, Andrew Hansen
Abstract: The rheological properties of blended cement-based materials depend strongly on mixture proportions and the characteristics of the components, such as cement and fly ash. In this study, design of experiments is used to investigate the influence of t ...

32. Internal Curing - Constructing More Robust Concrete
Published: 1/19/2012
Authors: Jason Weiss, Dale P Bentz, Anton Schlinder, Pietro Lura
Abstract: It is often said that there are two types of concrete: concrete that has cracked and concrete that is going to crack. Unfortunately, this is true all too frequently. Many of these unwanted cracks develop shortly after the concrete is placed and in ...

33. Analysis of Early-Age Bridge Deck Cracking in Nevada and Wyoming
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7841
Published: 1/17/2012
Authors: Dale P Bentz, Paul E Stutzman, Aaron Richard Sakulich, William Jason Weiss
Abstract: In late 2009, the Echo Wash and Valley of Fire bridge decks were constructed in the Lake Mead National Recreation area in Nevada. Within six months, in early 2010, both decks exhibited considerable transverse cracking, with some cracks extendin ...

34. Fine Limestone Additions to Regulate Setting in High Volume Fly Ash Mixtures
Published: 1/2/2012
Authors: Dale P Bentz, Taijiro Sato, Igor de la Varga, Jason Weiss
Abstract: High volume fly ash (HVFA) concrete mixtures are being considered more frequently due to their cost and sustainability advantages. While the long term performance of these HVFA concretes typically meets or exceeds that of conventional concretes, the ...

35. Thermal Properties and Thermal Modeling of Ballistic Clay Box
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7840
Published: 12/30/2011
Authors: Dale P Bentz, Amanda Lattam Forster, Kirk D Rice, Michael A Riley
Abstract: A critical component of hard and soft body armor testing is the utilization of a clay block behind the component being evaluated. One of the performance metrics used to evaluate products is the penetration depth into the clay of an indentation ...

36. Comparison of ASTM C311 Strength Activity Index Testing vs. Testing Based on Constant Volumetric Proportions
Published: 9/12/2011
Authors: Dale P Bentz, Alejandro Duran-Herrera, Daniel Galvez-Moreno
Abstract: Currently, the (pozzolanic) strength activity indices of fly ashes and natural pozzolans are typically evaluated using the procedures outlined in ASTM C311, ,Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portl ...

37. Parametric assessment of stress development and cracking in internally-cured restrained mortars experiencing autogenous deformations and thermal loading
Published: 9/1/2011
Authors: Kambiz Raoufi, John Schlitter, Dale P Bentz, Jason Weiss
Abstract: This study used a finite element model to examine how the properties of cementitious mortar are related to the rate of stress development in the dual ring test. The results of this investigation are used to explain the thermal cracking behavior of m ...

38. Effect of sample conditioning on the water absorption of concrete
Published: 8/1/2011
Authors: Javier Castro, Dale P Bentz, Jason Weiss
Abstract: ASTM C1585 is commonly used to determine the absorption and rate of absorption of water in unsaturated hydraulic cement concretes. ASTM C1585 preconditions the samples for a total of 18 days. Unfortunately however, the range of relative humidities th ...

39. Optimization of Cement and Fly Ash Particles to Produce Sustainable Concretes
Published: 8/1/2011
Authors: Dale P Bentz, Andrew Hansen, John Guynn
Abstract: In the drive to produce more sustainable concretes, considerable emphasis has been placed on replacing cement in concrete mixtures with more sustainable materials, both from a raw materials cost and a CO2 footprint perspective. High volume fly ash c ...

40. Bridging the Micro to Macro Gap: A New Application for Milli-probe X-ray Fluorescence
Published: 6/1/2011
Authors: Jeffrey M. Davis, Dale E Newbury, Nicholas W m Ritchie, Edward P. Vicenzi, Dale P Bentz, Albert J. Fahey
Abstract: X-ray elemental mapping and x-ray spectrum imaging are powerful microanalytical tools. However, their scope is limited spatially by the raster area of a scanning electron microscope or microprobe. Limited sampling size becomes a significant issue w ...

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