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Title: Phased-Resolved Strain Measuremetns in Hydrated Ordinary Portland Cement Using Synchrotron x-Rays (Prop. 2003-033)

Abstract

X-ray diffraction methods developed for the determination of residual stress states in crystalline materials have been applied to study residual strains and strains because of mechanical loading of ordinary portland cement paste. Synchrotron X-rays were used to make in situ measurements of interplanar spacings in the calcium hydroxide (CH) phase of hydrated neat portland cement under uniaxial compression. The results indicate that strains on the order of 1/100 000 can be resolved providing an essentially new technique by which to measure the phase-resolved meso-scale mechanical behavior of cement under different loading conditions. Evaluation of these strain data in view of published elastic parameters for CH suggests that the CH carries a large fraction of the applied stress and that plastic interactions with the matrix are notable.

Authors:
 [1];  [2];  [1];  [2];  [3]
  1. Tennessee Technological University
  2. ORNL
  3. Brookhaven National Laboratory (BNL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1003104
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Ceramic Society; Journal Volume: 89; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEHAVIOR; CALCIUM HYDROXIDES; CEMENTS; COMPRESSION; DATA; EVALUATION; INTERACTIONS; LOADING; MATERIALS; PLASTICS; PORTLAND CEMENT; STRAINS; SYNCHROTRONS; X-RAY DIFFRACTION

Citation Formats

BIernacki, Joseph J., Watkins, Thomas R, Parnham, C. J., Hubbard, Camden R, and Bai, J. Phased-Resolved Strain Measuremetns in Hydrated Ordinary Portland Cement Using Synchrotron x-Rays (Prop. 2003-033). United States: N. p., 2006. Web.
BIernacki, Joseph J., Watkins, Thomas R, Parnham, C. J., Hubbard, Camden R, & Bai, J. Phased-Resolved Strain Measuremetns in Hydrated Ordinary Portland Cement Using Synchrotron x-Rays (Prop. 2003-033). United States.
BIernacki, Joseph J., Watkins, Thomas R, Parnham, C. J., Hubbard, Camden R, and Bai, J. Sun . "Phased-Resolved Strain Measuremetns in Hydrated Ordinary Portland Cement Using Synchrotron x-Rays (Prop. 2003-033)". United States. doi:.
@article{osti_1003104,
title = {Phased-Resolved Strain Measuremetns in Hydrated Ordinary Portland Cement Using Synchrotron x-Rays (Prop. 2003-033)},
author = {BIernacki, Joseph J. and Watkins, Thomas R and Parnham, C. J. and Hubbard, Camden R and Bai, J.},
abstractNote = {X-ray diffraction methods developed for the determination of residual stress states in crystalline materials have been applied to study residual strains and strains because of mechanical loading of ordinary portland cement paste. Synchrotron X-rays were used to make in situ measurements of interplanar spacings in the calcium hydroxide (CH) phase of hydrated neat portland cement under uniaxial compression. The results indicate that strains on the order of 1/100 000 can be resolved providing an essentially new technique by which to measure the phase-resolved meso-scale mechanical behavior of cement under different loading conditions. Evaluation of these strain data in view of published elastic parameters for CH suggests that the CH carries a large fraction of the applied stress and that plastic interactions with the matrix are notable.},
doi = {},
journal = {Journal of the American Ceramic Society},
number = 9,
volume = 89,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • X-ray diffraction methods developed for the determination of residual stress states in crystalline materials have been applied to study residual strains and strains because of mechanical loading of ordinary Portland cement paste. Synchrotron X-rays were used to make in situ measurements of interplanar spacings in the calcium hydroxide (CH) phase of hydrated neat Portland cement under uniaxial compression. The results indicate that strains on the order of 1/100000 can be resolved providing an essentially new technique by which to measure the phase-resolved meso-scale mechanical behavior of cement under different loading conditions. Evaluation of these strain data in view of publishedmore » elastic parameters for CH suggests that the CH carries a large fraction of the applied stress and that plastic interactions with the matrix are notable.« less
  • Many ordinary portland cement (OPC) OPC-pulverized fuel ash (pfa) blended pastes of various ages have been examined using transmission electron microscopy, energy dispersive x-ray analysis, and scanning electron microscopy. In the pfa-blended cements, some of the pfa particles reacted to give a radially fibrillar gel, and others showed areas of well-crystallized hydrogarnet within the clearly defined outer boundary of the particle.
  • In this study, the effect of suppression on phosphate liberation from eutrophic lake sediment by using fly ash and ordinary Portland cement (OPC) was investigated by small scale experiment. A system including sediment, lake water, and several kinds of capping materials was designed to clarify the suppression of phosphate liberation from sediment under the anaerobic condition. The suppression efficiencies of fly ash, OPC and glass bead used as control material were also determined, and these effects were discussed. The suppression efficiency of glass bead was 44.4%, and those of fly ash and OPC were 84.4%, 94.9%, respectively. The suppression bymore » fly ash and OPC was mainly carried out by the adsorption effect, in addition to the covering effect. The suppression efficiency depended on the amounts of the material used, and about 90% of liberated phosphate was suppressed by fly ash of 10.0 Kg m{sup -2}, and OPC of 6.0 Kg m{sup -2}. The concentrations of heavy metals, such as mercury, cadmium, lead, copper, zinc, chromium, silver, arsenic and nickel, in fly ash and OPC were lower than those in the environmental materials. And it was considered that the concentrations of heavy metals in fly ash and OPC were too low to influence the ecosystem in natural water region.« less
  • No abstract prepared.
  • No abstract prepared.