The reactivity of aluminosilicate glasses in cements - effects of Ca content on dissolution characteristics and surface precipitation

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Abstract

The partial replacement of Portland cement (PC) by glassy aluminosilicates in cementitious binders has been common practice for decades, offering concretes with increased durability and long term strength compared with PC concretes. However, these concretes typically display a much lower rate of strength development and this limits practical levels of cement replacement. The factors contributing to strength development in concrete are complex but amongst them is the reactivity of the SCM, which has been associated with glass content, and composition with respect to the ratio of network modifiers to network formers, etc. This paper revisits the assessment of reactivity using a fundamental dissolution approach and highlights a rapid migration of soluble constituents, specifically Ca, to the surface on contact with an activating solution. The conditions which affect the composition of Ca-bearing precipitates and their role in on-going hydration is discussed.
Original languageEnglish
Pages (from-to)216-224
Number of pages9
JournalAdvances in Applied Ceramics
Volume116
Early online date13 Mar 2017
DOIs
Publication statusPublished - 2017

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Aluminosilicates
Cements
Dissolution
Concretes
Glass
Portland cement
Bearings (structural)
Chemical analysis
Hydration
Contacts (fluid mechanics)
Binders
Precipitates
Durability
aluminosilicate

Keywords

  • aluminosilicate glass
  • early stage dissolution
  • blastfurnace slag
  • Ca reactivity

Cite this

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title = "The reactivity of aluminosilicate glasses in cements - effects of Ca content on dissolution characteristics and surface precipitation",
abstract = "The partial replacement of Portland cement (PC) by glassy aluminosilicates in cementitious binders has been common practice for decades, offering concretes with increased durability and long term strength compared with PC concretes. However, these concretes typically display a much lower rate of strength development and this limits practical levels of cement replacement. The factors contributing to strength development in concrete are complex but amongst them is the reactivity of the SCM, which has been associated with glass content, and composition with respect to the ratio of network modifiers to network formers, etc. This paper revisits the assessment of reactivity using a fundamental dissolution approach and highlights a rapid migration of soluble constituents, specifically Ca, to the surface on contact with an activating solution. The conditions which affect the composition of Ca-bearing precipitates and their role in on-going hydration is discussed.",
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volume = "116",
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T1 - The reactivity of aluminosilicate glasses in cements - effects of Ca content on dissolution characteristics and surface precipitation

AU - Newlands, Katrina C

AU - Macphee, Donald E

PY - 2017

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AB - The partial replacement of Portland cement (PC) by glassy aluminosilicates in cementitious binders has been common practice for decades, offering concretes with increased durability and long term strength compared with PC concretes. However, these concretes typically display a much lower rate of strength development and this limits practical levels of cement replacement. The factors contributing to strength development in concrete are complex but amongst them is the reactivity of the SCM, which has been associated with glass content, and composition with respect to the ratio of network modifiers to network formers, etc. This paper revisits the assessment of reactivity using a fundamental dissolution approach and highlights a rapid migration of soluble constituents, specifically Ca, to the surface on contact with an activating solution. The conditions which affect the composition of Ca-bearing precipitates and their role in on-going hydration is discussed.

KW - aluminosilicate glass

KW - early stage dissolution

KW - blastfurnace slag

KW - Ca reactivity

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DO - 10.1080/17436753.2017.1299986

M3 - Article

VL - 116

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JO - Advances in Applied Ceramics

JF - Advances in Applied Ceramics

SN - 1743-6753

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