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Author: dale bentz

Displaying records 31 to 40 of 168 records.
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31. 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 ...

32. 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 ...

33. 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 ...

34. 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 ...

35. 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 ...

36. Examining Capillary Depercolation in Cement-Based Materials: Measurement Techniques and Parameters which Influence their Interpretation
Published: 5/31/2011
Authors: G Sant, Dale P Bentz, Jason Weiss
Abstract: The connectivity of the porosity in cement-based materials has an impact on material durability, the interpretation of experimental measurements such as chemical shrinkage, and the timing of curing operations. While several techniques have been used ...

37. Effect of Initial Scarification and Overlay Treatment Timing on Chloride Concentrations in Concrete Bridge Decks
Published: 5/23/2011
Authors: W. Spencer Guthrie, Curtis Nolan, Dale P Bentz
Abstract: Scarification and overlay (SO) procedures are often performed on concrete bridge decks to minimize the corrosion of reinforcing steel due to chloride ingress. Given the need to develop guidelines for the initial timing of SO treatments, the objectiv ...

38. Critical Observations for the Evaluation of Cement Hydration Models
Published: 4/22/2011
Author: Dale P Bentz
Abstract: The development of computer models for cement hydration and microstructure development that has accelerated in the past 25 years has created a need for a set of critical experimental observations that can be used in evaluating the model predictions. ...

39. Internal Curing: A 2010 State-of-the-Art Review
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7765
Published: 2/9/2011
Authors: Dale P Bentz, Jason Weiss
Abstract: The American Concrete Institute in 2010 defined internal curing as supplying water throughout a freshly placed cementitious mixture using reservoirs, via pre-wetted lightweight aggregates, that readily release water as needed for hydration or to rep ...

40. Optimization of Particle Sizes in High Volume Fly Ash Blended Cements
Series: NIST Interagency/Internal Report (NISTIR)
Published: 2/2/2011
Authors: Dale P Bentz, Chiara F Ferraris, James J Filliben
Abstract: One major objective of the sustainable construction movement is to decrease the energy and carbon dioxide footprints of concrete. Since the production of portland cement is a major contributor in both of these areas, concretes with increasing quanti ...

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