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You searched on: Author: dale bentz

Displaying records 161 to 170 of 205 records.
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161. Computer Modeling of the Replacement of "Coarse" Cement Particles by Inert Fillers in Low W/C Ratio Concretes: Hydration and Strength.
Published: 1/1/2001
Authors: Dale P Bentz, J T Conway
Abstract: In concretes with water-to-cement (w/c) ratios below about 0.38, a portion of the cement particles will always remain unhydrated due to space limitations within the material. Thus, in many of the high-performance concretes currently being produced, c ...

162. Influence of Calcium Hydroxide Dissolution on the Transport Properties of Hydrated Cement Systems
Published: 1/1/2001
Authors: J Marchand, Dale P Bentz, E Samson, Y Maltais
Abstract: Calcium hydroxide is one of the main reaction products resulting from the hydration of Portland cement with water. It is also one of the more soluble phases found in hydrated cement systems. The influence of calcium hydroxide dissolution and its ef ...

163. 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 ...

164. 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 ...

165. 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 ...

166. 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 ...

167. 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 ...

168. 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 ...

169. 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 ...

170. 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 ...

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