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Author: dale bentz

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31. Thermal Properties of High-Volume Fly Ash Mortars and Concretes
Published: 1/3/2011
Authors: Dale P Bentz, Max A Peltz, Alejandro Duran-Herrera, P Valdez, Cesar Juarez
Abstract: As sustainability moves to the forefront of construction, the utilization of high volume fly ash concrete mixtures to reduce CO2 emissions and cement consumption per unit volume of concrete placed is receiving renewed interest. Concrete mixtures in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904340

32. Evaluation of Sustainable High-Volume Fly Ash Concretes
Published: 1/1/2011
Authors: Alejandro Duran-Herrera, Cesar Juarez, P Valdez, Dale P Bentz
Abstract: This article presents results of an experimental research work oriented to develop practical tools for the regional concrete industry, as well as to illustrate the potential benefits of the synergistic effect of an ASTM C 618 Class F fly ash (FA) pro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904699

33. Fire Resistive Materials: Thermal Barriers between Fires and Structures
Published: 11/1/2010
Author: Dale P Bentz
Abstract: Fire resistive materials (FRMs) serve a critical function in insulating (steel) structures to limit steel temperature rise during a fire exposure. This paper provides an overview of FRMs, focusing on the measurement of their thermophysical propertie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902567

34. Calorimetric Studies of Powder Additions to Mitigate Excessive Retardation in High Volume Fly Ash Mixtures
Published: 10/1/2010
Author: Dale P Bentz
Abstract: While high volume fly ash (HVFA) concrete mixtures are attractive from a sustainability viewpoint, they are sometimes plagued by long delays in finishing, producing a performance that is unacceptable to contractors. In this paper, isothermal calorim ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903321

35. A Dual Concentric Ring Test for Evaluating Residual Stress Development Due of Restrained Volume Change
Published: 9/1/2010
Authors: John Schlitter, Andrew Senter, Dale P Bentz, Tommy Nantung, Jason Weiss
Abstract: The standard restrained ring test (ASTM 1581-04) is a simple, economical method to evaluate a concrete mixture s susceptibility of shrinkage cracking. Unfortunately, the test only provides restraint against samples that shrink and can not be used to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904697

36. LWA Absorption and Desorption: The Influence on the Microstructure and Transport Properties of Internally Cured Mortars
Published: 9/1/2010
Authors: Javier Castro, Ryan Henkensiefken, Tommy Nantung, Dale P Bentz, Jason Weiss
Abstract: The increased propensity for shrinkage cracking in low water-to-cement ratio (w/c) concrete has resulted in the development of new methods that can reduce the risk of early-age cracking, including internal curing. Internal curing can use water-fille ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903822

37. Mixture Proportioning Options for Improving High Volume Fly Ash Concretes
Published: 9/1/2010
Authors: Dale P Bentz, Chiara F Ferraris, Max A Peltz, John A. Winpigler
Abstract: High volume fly ash (HVFA) concretes are one component of creating a more sustainable infrastructure. By replacing 50 % or more of the portland cement with fly ash, a significant reduction is achieved in the carbon footprint of the in place concrete ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904818

38. CT Measurements of SAP Voids in Concrete
Published: 8/15/2010
Authors: Sara Laustsen, Dale P Bentz, Marianne Hasholt, Ole Mejlhede Jensen
Abstract: This paper describes how X-ray computed tomography (CT) scanning can be used to determine the void distribution in hardened concrete. Three different approaches are used to analyse a binary data set created from CT measurement. One approach classifie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906106

39. Planar Image-Based Reconstruction of Pervious Concrete Pore Structure and Permeability Prediction
Published: 7/1/2010
Authors: Milani S Sumanasooriya, Dale P Bentz, Narayanan Neithalath
Abstract: Transport properties of porous materials such as pervious concretes are inherently dependent on a variety of pore structure features. Empirical equations are typically used to relate the pore structure of a porous material to its permeability. In t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903884

40. ADVANCES IN PORE STRUCTURE CHARACTERIZATION AND PERFORMANCE PREDICTION OF PERVIOUS CONCRETES
Published: 5/3/2010
Authors: Narayanan Neithalath, Dale P Bentz, Milani S Sumanasooriya
Abstract: Pervious concrete is receiving renewed interest as a sustainable construction material for parking lots, sidewalks, and low-traffic-volume roads. A key characteristic of this material is its coarse porosity, achieved by omitting the fine aggregates ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902557