Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure

X. Feng, E. J. Garboczi, D. P. Bentz, P. E. Stutzman, Thomas O Mason

Research output: Contribution to journalArticle

113 Citations (Scopus)

Abstract

A scanning electron microscope (SEM) point-counting technique was employed to study the hydration of plain portland and blended cement pastes containing fly ash or slag. For plain portland cement pastes, the results for the degree of cement hydration obtained by the SEM point-counting technique were consistent with the results from the traditional loss-on-ignition (LOI) of nonevaporable water-content measurements; agreement was within ±10%. The standard deviation in the determination of the degree of cement hydration via point counting ranged from ±1.5% to ±1.8% (one operator, one sample). For the blended cement pastes, it is the first time that the degree of hydration of cement in blended systems has been studied directly. The standard deviation for the degree of hydration of cement in the blended cement pastes ranged from ±1.4% to ±2.2%. Additionally, the degrees of reaction of the mineral admixtures (MAs) were also measured. The standard deviation for the degree of fly ash reaction was ±4.6% to ±5.0% and ±3.6% to ±4.3% for slag. All of the analyses suggest that the SEM point-counting technique can be a reliable and effective analysis tool for use in studies of the hydration of blended cement pastes.

Original languageEnglish
Pages (from-to)1787-1793
Number of pages7
JournalCement and Concrete Research
Volume34
Issue number10
DOIs
Publication statusPublished - Oct 2004

Fingerprint

Ointments
Hydration
Cements
Electron microscopes
Scanning
Coal Ash
Fly ash
Slags
Portland cement
Water content
Minerals
Ignition

Keywords

  • Blended cement
  • Fly ash
  • Granulated blast-furnace slag
  • Hydration
  • Point counting

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

Cite this

Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure. / Feng, X.; Garboczi, E. J.; Bentz, D. P.; Stutzman, P. E.; Mason, Thomas O.

In: Cement and Concrete Research, Vol. 34, No. 10, 10.2004, p. 1787-1793.

Research output: Contribution to journalArticle

@article{4bb6158efaa34205aede0076ad2df9ad,
title = "Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure",
abstract = "A scanning electron microscope (SEM) point-counting technique was employed to study the hydration of plain portland and blended cement pastes containing fly ash or slag. For plain portland cement pastes, the results for the degree of cement hydration obtained by the SEM point-counting technique were consistent with the results from the traditional loss-on-ignition (LOI) of nonevaporable water-content measurements; agreement was within ±10{\%}. The standard deviation in the determination of the degree of cement hydration via point counting ranged from ±1.5{\%} to ±1.8{\%} (one operator, one sample). For the blended cement pastes, it is the first time that the degree of hydration of cement in blended systems has been studied directly. The standard deviation for the degree of hydration of cement in the blended cement pastes ranged from ±1.4{\%} to ±2.2{\%}. Additionally, the degrees of reaction of the mineral admixtures (MAs) were also measured. The standard deviation for the degree of fly ash reaction was ±4.6{\%} to ±5.0{\%} and ±3.6{\%} to ±4.3{\%} for slag. All of the analyses suggest that the SEM point-counting technique can be a reliable and effective analysis tool for use in studies of the hydration of blended cement pastes.",
keywords = "Blended cement, Fly ash, Granulated blast-furnace slag, Hydration, Point counting",
author = "X. Feng and Garboczi, {E. J.} and Bentz, {D. P.} and Stutzman, {P. E.} and Mason, {Thomas O}",
year = "2004",
month = "10",
doi = "10.1016/j.cemconres.2004.01.014",
language = "English",
volume = "34",
pages = "1787--1793",
journal = "Cement and Concrete Research",
issn = "0008-8846",
publisher = "Elsevier Limited",
number = "10",

}

TY - JOUR

T1 - Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure

AU - Feng, X.

AU - Garboczi, E. J.

AU - Bentz, D. P.

AU - Stutzman, P. E.

AU - Mason, Thomas O

PY - 2004/10

Y1 - 2004/10

N2 - A scanning electron microscope (SEM) point-counting technique was employed to study the hydration of plain portland and blended cement pastes containing fly ash or slag. For plain portland cement pastes, the results for the degree of cement hydration obtained by the SEM point-counting technique were consistent with the results from the traditional loss-on-ignition (LOI) of nonevaporable water-content measurements; agreement was within ±10%. The standard deviation in the determination of the degree of cement hydration via point counting ranged from ±1.5% to ±1.8% (one operator, one sample). For the blended cement pastes, it is the first time that the degree of hydration of cement in blended systems has been studied directly. The standard deviation for the degree of hydration of cement in the blended cement pastes ranged from ±1.4% to ±2.2%. Additionally, the degrees of reaction of the mineral admixtures (MAs) were also measured. The standard deviation for the degree of fly ash reaction was ±4.6% to ±5.0% and ±3.6% to ±4.3% for slag. All of the analyses suggest that the SEM point-counting technique can be a reliable and effective analysis tool for use in studies of the hydration of blended cement pastes.

AB - A scanning electron microscope (SEM) point-counting technique was employed to study the hydration of plain portland and blended cement pastes containing fly ash or slag. For plain portland cement pastes, the results for the degree of cement hydration obtained by the SEM point-counting technique were consistent with the results from the traditional loss-on-ignition (LOI) of nonevaporable water-content measurements; agreement was within ±10%. The standard deviation in the determination of the degree of cement hydration via point counting ranged from ±1.5% to ±1.8% (one operator, one sample). For the blended cement pastes, it is the first time that the degree of hydration of cement in blended systems has been studied directly. The standard deviation for the degree of hydration of cement in the blended cement pastes ranged from ±1.4% to ±2.2%. Additionally, the degrees of reaction of the mineral admixtures (MAs) were also measured. The standard deviation for the degree of fly ash reaction was ±4.6% to ±5.0% and ±3.6% to ±4.3% for slag. All of the analyses suggest that the SEM point-counting technique can be a reliable and effective analysis tool for use in studies of the hydration of blended cement pastes.

KW - Blended cement

KW - Fly ash

KW - Granulated blast-furnace slag

KW - Hydration

KW - Point counting

UR - http://www.scopus.com/inward/record.url?scp=4344596764&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4344596764&partnerID=8YFLogxK

U2 - 10.1016/j.cemconres.2004.01.014

DO - 10.1016/j.cemconres.2004.01.014

M3 - Article

AN - SCOPUS:4344596764

VL - 34

SP - 1787

EP - 1793

JO - Cement and Concrete Research

JF - Cement and Concrete Research

SN - 0008-8846

IS - 10

ER -