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You searched on: Author: dale bentz

Displaying records 161 to 170 of 202 records.
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161. Influence of Cement Particle Size Distribution on Early Age Autogenous Strains and Stresses in Cement-Based Materials
Published: 1/1/2001
Authors: Dale P Bentz, C Haecker, K K Hansen, O M Jensen, J F Oleson, H S Stang
Abstract: The influence of cement particle size distribution (PSD)on autogenous strains and stresses in cement pastes of identical water-to-cement ratio is examined for cement powders of four different finenesses. Experimental measurements include chemical sh ...

162. Knowledge-Based Systems and Computational Tools for Concrete - Computer Integrated Knowledge Systems Combine Databases, Models, and Computing Tools to Address the Complex Nature of Concrete
Published: 12/1/2000
Authors: Edward Joseph Garboczi, Dale P Bentz, G J. Frohnsdorff
Abstract: Within the Building Materials Division at the National Institute of Standards and Technology (NIST), the Hypercon Partnership for High Performance Concrete Technology [(PHPCT)] program is working to develop the materi ...

163. User's Guide to the NIST Virtual Cement and Concrete Testing Laboratory. Version 1.0 (NISTIR 6583)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6583
Published: 11/1/2000
Authors: Dale P Bentz, Glenn P Forney
Abstract: This NISTIR serves as the user's manual for Version 1.0 of the Virtual Cement and Concrete Testing Laboratory (VCCTL). Using the VCCTL, a user may create starting microstructures of cement (gypsum, fly ash, etc.) particles in water, hydrate the micr ...

164. Time-Dependent Diffusivities: Possible Misinterpretation Due to Spatial Dependence
Published: 9/1/2000
Authors: Dale P Bentz, X Feng, R. Douglas Hooton
Abstract: To accurately predict the service life of a reinforced concrete structure exposed to chloride ions, it is necessary to estimate the temporal dependence of the diffusivity coefficient. Due to continued hydration of the cement, etc., the diffusivity o ...

165. A Computer Model to Predict the Surface Temperature and Time-of-Wetness of Concrete Pavements and Bridge Decks
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6551
Published: 8/1/2000
Author: Dale P Bentz
Abstract: This report provides documentation and example results for a computer model developed to predict the surface temperature and time-of-wetness (and time-of-freezing) of concrete pavements and bridge decks. The model is based on a one-dimensional finite ...

166. Analysis of CCRL Proficiency Cements 135 and 136 Using CEMHYD3D
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6545
Published: 8/1/2000
Authors: Dale P Bentz, X Feng, C Haecker, Paul E Stutzman
Abstract: This NISTIR provides experimental and computer modeling results for cements 135 and 136 issued by the Cement and Concrete Reference Laboratory (CCRL) at NIST in January of 2000. The purposes of this report are to characterize the ability of the NIST ...

167. Percolation Aspects of Cement Paste and Concrete - Properties and Durability
Published: 8/1/2000
Authors: Edward Joseph Garboczi, Dale P Bentz
Abstract: Synopsis: Portland cement concrete is a composite material, where the matrix consists of portland cement paste. Cement paste forms from the hydration reaction of portland cement with water. The microstructure of cement paste changes drastically ov ...

168. Influence of Silica Fume on Diffusivity in Cement-Based Materials II. Multi-Scale Modeling of Concrete Diffusivity
Published: 7/1/2000
Author: Dale P Bentz
Abstract: Based on a set of multi-scale computer models, an equation is developed for predicting the chloride ion diffusivity of concrete as a function of water-to-cement (w/c) ratio, silica fume addition, degree of hydration, and aggregate volume fraction. S ...

169. Preliminary Observations of Water Movement in Cement Pastes During Curing Using X-Ray Absorption
Published: 7/1/2000
Authors: Dale P Bentz, K K Hansen
Abstract: X-ray absorption equipment and concurrent mass measurements are used in quantifying water movement in 4 to 5 mm thick cement paste specimens with their top surface exposed to drying. Experimental variables examined in this preliminary study include ...

170. Influence of Silica Fume on Diffusivity in Cement-Based Materials. I. Experimental and Computer Modeling Studies on Cement Pastes
Published: 6/1/2000
Authors: Dale P Bentz, O M Jensen, A M Coats, F P Glasser
Abstract: Experimental and computer modeling studies are applied to determining the influence of silica fume on the microstructure and diffusivity of cement paste. It is suggested that silica fume modifies the inherent nanostructure of the calcium silicate hy ...

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