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You searched on: Author: Jeffrey Bullard

Displaying records 1 to 10 of 79 records.
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1. Phase Analysis of Portland Cements by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy
Series: Journal of Research (NIST JRES)
Published: 4/11/2016
Authors: Paul E Stutzman, Pan Feng, Jeffrey W Bullard
Abstract: X-ray powder diffraction (XRD) has been used for several decades to identify and measure the mass fractions of various crystalline phases in portland cement. More recently, a combination of scanning electron microscopy with X-ray microanalysis ( ...

2. Factors Influencing the Stability of AFm and AFt in the Ca-Al-S-O-H System at 25 C
Published: 4/1/2016
Authors: Pan Feng, Changwen Miao, Jeffrey W Bullard
Abstract: The equilibrium phase assemblages that have been predicted in previous studies for the Ca-Al-S-O-H system at 25 C are revisited by calculating boundaries between equilibrium solubility surfaces among gibbsite, hydrogarnet, portlandite, calcium mo ...

3. Microstructural Origins of Cement Paste Degradation by External Sulfate Attack
Published: 10/15/2015
Authors: Pan Feng, Edward Joseph Garboczi, Changwen Miao, Jeffrey W Bullard
Abstract: A microstructure model has been applied to simulate near-surface degradation of portland cement paste in contact with a sodium sulfate solution. This new model uses thermodynamic equilibrium calculations to guide both compositional and microstructure ...

4. MicroChar: An Application for Quantitative Analysis of Cement and Clinker Microstructure Images
Series: Technical Note (NIST TN)
Report Number: 1876
Published: 4/30/2015
Author: Jeffrey W Bullard
Abstract: Accurate quantitative data on cement and clinker microstructure images can prove valuable for monitoring and controlling the manufacturing of cement-based powders. Furthermore, quantitative characterization of microstructure is an essential input to ...

5. Time Dependent Driving Forces and the Kinetics of Tricalcium Silicate Hydration
Published: 4/22/2015
Authors: Jeffrey W Bullard, George W Scherer, Jeffrey J. Thomas
Abstract: Simulations of tricalcium silicate (C3S) hydration using a kinetic cellular automaton program, HydratiCA, indicate that the net rate depends both on C3S dissolution and on hydration product growth. Neither process can be considered the sole rate-con ...

6. Quantitative Imaging of Clinker and Cement Microstructure
Series: Technical Note (NIST TN)
Report Number: 1877
Published: 4/15/2015
Authors: Paul E Stutzman, Jeffrey W Bullard, Pan Feng
Abstract: The combination of scanning electron microscopy (SEM) with X-ray microanalysis and image processing provides a powerful ability to image and quantify microstructural features of con- struction materials. This document provides guidance for collecting ...

7. Incorporating D3.js Information Visualization into Immersive Virtual Environments
Published: 4/9/2015
Authors: Wesley N Griffin, Luis D. (Danny) Catacora, Jeffrey W Bullard, Judith Ellen Terrill
Abstract: We have created an integrated interactive visualization and analysis environment that can be used immersively or on the desktop to study a simulation of microstructure development during hydration or degradation of cement pastes and concrete. Our env ...

8. Computing the Time Evolution of the Apparent Viscoelastic/Viscoplastic Poisson's Ratio of Hydrating Cement Paste
Published: 2/15/2015
Authors: Li xiodan, Zachary Grasley, Jeffrey W Bullard, Edward Joseph Garboczi
Abstract: A computational model has been developed that combines finite element methods with microstructure development simulations to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate vis ...

9. Modeling the apparent and intrinsic viscoelastic relaxation of hydrating cement paste
Published: 1/31/2015
Authors: Xiaodan Li, Zachary Grasley, Edward Joseph Garboczi, Jeffrey W Bullard
Abstract: Finite element procedures combined with microstructure development modeling are integrated to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate viscoelasticity and microstructure ...

10. New Insights into the Prehydration of Cement and Its Mitigation
Published: 1/27/2015
Authors: Julyan Stoian, Tandre Oey, Jeffrey W Bullard, Jian Huang, Aditya Kumar, Magdalena Balonis, Judith Ellen Terrill, Narayanan Neithalath, Gaurav Sant
Abstract: Ordinary Portland cement (OPC) prehydrates during storage or handling in moist environments, forming hydration products on or near its particles' surfaces. Prehydration is known to reduce OPC reactivity, but the extent of prehydration has not yet bee ...

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  • SP 250-XX: Calibration Services
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