Alkali-activated cement based on natural SiO2-containing material: Part I. Strength, hydration, microstructure and durability

C. Freidin

doi:10.1016/S0008-8846(03)00088-7

Alkali-activated cement based on natural SiO₂-containing material: Part I. Strength, hydration, microstructure and durability

C. Freidin

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

An alkali-activated cement (AAC) based on natural SiO ₂-containing materials - grounded porcellanite (Pr) and highly dispersed pure quartz sand - was examined. Sodium hydroxide was used as an alkali activator. The pressed specimens were prepared and were cured in an autoclave at a pressure of 1.6 MPa and a temperature of 205 °C. It was shown that the strength of cement as well as compound and the microstructure of its hydration products depend on the cement composition. It was distinguished that autoclave-cured cementing matter comprises secondary quartz and the mass of sodium hydrated silicates along with the initial Pr crystal phases. After a 2-year storage under water, 15% Na₂SO₄, and Dead Sea water, the strength of specimens decreased by 17.5-20%. Control specimens, prepared with Portland cement and immersed in a 15% Na₂SO ₄ solution for 2 weeks, were broken up completely. Positive results of long-term durable tests suggest that an AAC based on natural raw material would be stable in other salt solutions.

Original language	English
Pages (from-to)	1417-1422
Number of pages	6
Journal	Cement and Concrete Research
Volume	33
Issue number	9
DOIs	https://doi.org/10.1016/S0008-8846(03)00088-7
State	Published - 1 Sep 2003

Keywords

Alkali-activated cement
Durability
Hydration product
Mechanical properties

ASJC Scopus subject areas

Building and Construction
Materials Science (all)

Access to Document

10.1016/S0008-8846(03)00088-7

Cite this

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title = "Alkali-activated cement based on natural SiO2-containing material: Part I. Strength, hydration, microstructure and durability",

abstract = "An alkali-activated cement (AAC) based on natural SiO 2-containing materials - grounded porcellanite (Pr) and highly dispersed pure quartz sand - was examined. Sodium hydroxide was used as an alkali activator. The pressed specimens were prepared and were cured in an autoclave at a pressure of 1.6 MPa and a temperature of 205 °C. It was shown that the strength of cement as well as compound and the microstructure of its hydration products depend on the cement composition. It was distinguished that autoclave-cured cementing matter comprises secondary quartz and the mass of sodium hydrated silicates along with the initial Pr crystal phases. After a 2-year storage under water, 15% Na2SO4, and Dead Sea water, the strength of specimens decreased by 17.5-20%. Control specimens, prepared with Portland cement and immersed in a 15% Na2SO 4 solution for 2 weeks, were broken up completely. Positive results of long-term durable tests suggest that an AAC based on natural raw material would be stable in other salt solutions.",

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N2 - An alkali-activated cement (AAC) based on natural SiO 2-containing materials - grounded porcellanite (Pr) and highly dispersed pure quartz sand - was examined. Sodium hydroxide was used as an alkali activator. The pressed specimens were prepared and were cured in an autoclave at a pressure of 1.6 MPa and a temperature of 205 °C. It was shown that the strength of cement as well as compound and the microstructure of its hydration products depend on the cement composition. It was distinguished that autoclave-cured cementing matter comprises secondary quartz and the mass of sodium hydrated silicates along with the initial Pr crystal phases. After a 2-year storage under water, 15% Na2SO4, and Dead Sea water, the strength of specimens decreased by 17.5-20%. Control specimens, prepared with Portland cement and immersed in a 15% Na2SO 4 solution for 2 weeks, were broken up completely. Positive results of long-term durable tests suggest that an AAC based on natural raw material would be stable in other salt solutions.

AB - An alkali-activated cement (AAC) based on natural SiO 2-containing materials - grounded porcellanite (Pr) and highly dispersed pure quartz sand - was examined. Sodium hydroxide was used as an alkali activator. The pressed specimens were prepared and were cured in an autoclave at a pressure of 1.6 MPa and a temperature of 205 °C. It was shown that the strength of cement as well as compound and the microstructure of its hydration products depend on the cement composition. It was distinguished that autoclave-cured cementing matter comprises secondary quartz and the mass of sodium hydrated silicates along with the initial Pr crystal phases. After a 2-year storage under water, 15% Na2SO4, and Dead Sea water, the strength of specimens decreased by 17.5-20%. Control specimens, prepared with Portland cement and immersed in a 15% Na2SO 4 solution for 2 weeks, were broken up completely. Positive results of long-term durable tests suggest that an AAC based on natural raw material would be stable in other salt solutions.

KW - Alkali-activated cement

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