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Author: dale bentz

Displaying records 131 to 140 of 185 records.
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131. Service Life Prediction Based on Sorptivity for Highway Concrete Exposed to Sulfate Attack and Freeze-Thaw Conditions
Published: 3/1/2002
Authors: Dale P Bentz, M A Ehlen, Chiara F Ferraris, John A. Winpigler
Abstract: This user's guide describes the set of screens and an example analysis for CONCLIFE, user-friendly software for estimating the service life of concrete pavements and bridge decks exposed to sulfate attack and freeze-thaw deterioration. CONCLIFE uses ...

132. The Visible Cement Data Set
Series: Journal of Research (NIST JRES)
Published: 3/1/2002
Authors: Dale P Bentz, S Mizell, Steven G Satterfield, J E Devaney, William L George, Peter M. Ketcham, James R Graham, J E Porterfield, Daniel A Quenard, F A Vallee, H Sallee, E Boller, J Baruchel
Abstract: With advances in X-ray microtomography, it is now possible to obtain three-dimensional representations of a material's microstructure with a voxel size of less then one micrometer. The Visible Cement Data Set represents a collection of 3-D data set ...

133. On the Mitigation of Early Age Cracking
Published: 1/1/2002
Authors: Dale P Bentz, M R Geiker, O M Jensen
Abstract: Potential means of limiting early age cracking ofconcrete structures have been investigated. Threedifferent methods of mitigating autogenous strainsand stresses in cement mortars (w/s=0.35, 8 % silica fume) are compared: 1.) reduction of thesurface ...

134. The Virtual Cement and Concrete Testing Laboratory Consortium Annual Report 2001
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6840
Published: 12/1/2001
Author: Dale P Bentz
Abstract: The Virtual Cement and Concrete Testing Laboratory(VCCTL) consortium was formed in January of 2001. Headquartered in the Building and Fire ResearchLaboratory at the National Institute of Standardsand Technology (NIST), the consortium currentlyconsis ...

135. Drying/Hydration in Cement Pastes During Curing
Published: 11/1/2001
Authors: Dale P Bentz, K K Hansen, H D Madsen, F A Vallee, E J Griesel
Abstract: As concrete cures in the field, there is a constant competition for the mixing water between evaporation and hydration processes. Understanding the mechanisms of water movement in the drying/hydrating cement paste is critical for designing curing sy ...

136. 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 ...

137. 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 ...

138. 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 ...

139. 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 ...

140. 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, ...

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