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Author: dale bentz

Displaying records 151 to 160 of 168 records.
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151. Protected Paste Volume in Concrete: Extension to Internal Curing Using Saturated Lightweight Fine Aggregate
Published: 11/1/1999
Authors: Dale P Bentz, Kenneth Alan Snyder
Abstract: One difficulty in the field use of high performance concrete is the extensive self-desiccation and autogeneous shrinkage that may occur due to its lower w/c ratio and the addition of silica fume to the mixture proportions. Several researchers have p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860184

152. Effects of Cement Particle Size Disbribution on Performance Properties of Portland Cement-Based Materials
Published: 10/1/1999
Authors: Dale P Bentz, Edward Joseph Garboczi, C Haecker, O M Jensen
Abstract: The original size, spatial distribution, and composition of Portland cement particles have a large influence on hydration kinetics, microstructure development, and ultimate properties of cement-based materials. In this paper, the effects of cement ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860176

153. Studies of Hydration and Drying in Cement Pastes by Scanning X-Ray Absorptiometry
Published: 10/1/1999
Authors: K K Hansen, Dale P Bentz
Abstract: Hydration and drying in cement pastes are studied by the x-ray environmental chamber at DTU. By using the x-ray detector to detect changes in internal density (indicative of drying), the influence of w/c ratio on drying during hydration is quantitat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860217

154. Transport Properties and Durability of Concrete: Literature Review and Research Plan
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6395
Published: 9/1/1999
Authors: Dale P Bentz, J R Clifton, Chiara F Ferraris, Edward Joseph Garboczi, J M Torrents
Abstract: The increased emphasis on life cycle cost analysis for building projects requires that new attention be focused on the service life and durability of concrete structures. While concrete is typically specified based on compressive strength and slump, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860229

155. Effects of Cement PSD on Porosity Percolation and Self-Desiccation
Published: 8/1/1999
Author: Dale P Bentz
Abstract: The degree of self-desiccation in field concrete depends on the availability of external water to replace that consumed due to the chemical shrinkage that occurs during cement hydration. As the cement hydrates, the capillary porosity depercolates, d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860171

156. SEM/X-Ray Imaging of Cement-Based Materials
Published: 8/1/1999
Authors: Dale P Bentz, Paul E Stutzman, C Haecker, S Remond
Abstract: Scanning electron microscopy and X-ray imaging techniques have been developed for imaging the complex microstructure of cement-based materials such as cement powder and fly ash. By combining the information available in the backscattered electron an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861061

157. Digital Images and Computer Modelling
Published: 7/1/1999
Authors: Edward Joseph Garboczi, Dale P Bentz, Nicos Martys
Abstract: This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real mater ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860146

158. An Argument for Using Coarse Cements in High-Performance Concretes
Published: 4/1/1999
Authors: Dale P Bentz, C J Hacker
Abstract: The NIST cement hydration microstructural model and experimental studies are used to investigate the effects of particle size distribution and water-to-cement ratio on hydration kinetics. Cement hydration is limited by the availability of water at t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860156

159. A Hard Core/Soft Shell Microstructural Model for Studying Percolation and Transport in Three-Dimensional Composite Media
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6265
Published: 1/1/1999
Authors: Dale P Bentz, Edward Joseph Garboczi, Kenneth Alan Snyder
Abstract: This user's manual provides documentation and computer program listings for the three-dimensional hard core/soft shell microstructure model developed at the National Institute of Standards and Technology. The model has been developed to represent th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860162

160. Diffusivity-Porosity Relation for Cement Paste
Published: 1/1/1999
Authors: Edward Joseph Garboczi, Dale P Bentz
Abstract: The development of a ionic diffusivity-porosity relation for cement paste, soundly based on microstructure, along with future developments in this area, are discussed. The importance of such relations for sulfate attack and other mechanisms of deter ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860167



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