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Author: dale bentz

Displaying records 131 to 140 of 169 records.
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131. Multi-Scale Microstructural Modeling to Predict Chloride Ion Diffusivity for High Performance Concrete
Published: 11/1/2001
Authors: Dale P Bentz, Edward Joseph Garboczi
Abstract: As durability issues become increasingly prominent in concrete design, the need to predict the transport properties of a given concrete mixture becomes critical. For many degradation scenarios (corrosion, sulfate attack, etc.), the diffusion coeffic ...

132. The Effect of Statistical Fluctuation, Finite Size Error, and Digital Resolution on the Phase Percolation and Transport Properties of the NIST Cement Hydration Model
Published: 10/1/2001
Authors: Edward Joseph Garboczi, Dale P Bentz
Abstract: The National Institute of Standards and Technology (NIST) cement hydration model starts with a three-dimensional digital image of cement particles, and then uses cellular automaton rules to simulate the reaction of cement with water and the developm ...

133. Sorptivity-Based Service Life Predictions for Concrete Pavements
Published: 9/1/2001
Authors: Dale P Bentz, M A Ehlen, Chiara F Ferraris, Edward Joseph Garboczi
Abstract: The degradation of concrete pavements is often controlled by the transport of a deleterious species (chloride or sulfate ions, or water in the case of freeze/thaw) into the concrete. With this in mind, a three-year research project, funded by the Fe ...

134. Concrete Optimization Software Tool User's Guide
Published: 7/1/2001
Authors: M J Simon, Dale P Bentz, James J Filliben
Abstract: This user's guide provides instructions for and examples of using the Concrete Optimization Software Tool (COST), a joint product of the Federal Highway Administration and the National Institute of Standards and Technology. COST provides an internet ...

135. Computer Modeling of the Replacement of Coarse Cement Particles by Inert Fillers in Low W/C Ratio Concretes: Hydration and Strength
Published: 3/1/2001
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, ...

136. 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 ...

137. 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 ...

138. 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 ...

139. 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 ...

140. 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 ...

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