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You searched on: Author: dale bentz

Displaying records 151 to 160 of 193 records.
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151. 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 ...

152. 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 ...

153. 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 ...

154. 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 ...

155. 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 ...

156. 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 ...

157. 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 ...

158. 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 ...

159. Effect of the Interfacial Transition Zone on the Conductivity of Portland Cement Mortars
Published: 5/1/2000
Authors: J D Shane, T Mason, D A Jennings, Edward Joseph Garboczi, Dale P Bentz
Abstract: The electrical conductivity of portland cement mortars was determined experimentally as a function of the volume fraction of sand and degree of hydration. The results were analyzed using theoretical models that represent the mortars as three-phase, ...

160. Fibers, Percolation, and Spalling of High-Performance Concrete
Published: 5/1/2000
Author: Dale P Bentz
Abstract: While the strength and durability of high performance concretes (HPCs) are often greatly superior to conventional concretes under ambient conditions, their failure is sometimes rapid and dramatic during exposure to a fire, characterized by the explos ...

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