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Author: dale bentz

Displaying records 161 to 170 of 186 records.
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161. 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 ...

162. 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 ...

163. 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, ...

164. 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 ...

165. 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 ...

166. 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 ...

167. 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 ...

168. 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 ...

169. Computer Modelling of Interfacial Transition Zone: Microstructure and Properties.
Published: 1/1/1999
Authors: Dale P Bentz, Edward Joseph Garboczi
Abstract: Many of the experimental advances in understanding interfacial transition zone (ITZ) microstructure and its role in the performance of cement-based composites have been either initiated or accompanied by advances in the computer modelliug of ITZ micr ...

170. Computer Simulation and Percolation Theory Applied to Concrete.
Published: 1/1/1999
Authors: Edward Joseph Garboczi, Dale P Bentz
Abstract: Concrete is a multilength scale composite material. From the nanometer to the millimeter scale, it is a random composite, and a different random composite at each length scale. Percolation processes play a key role in the microstucture of concrete, a ...

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