Development of a new rapid, relevant and reliable (R3) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays

François Avet; Ruben Snellings; Adrian Alujas Diaz; Mohsen Ben Haha; Karen Scrivener

doi:10.1016/j.cemconres.2016.02.015

Development of a new rapid, relevant and reliable (R³) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays

François Avet^*
, Ruben Snellings
, Adrian Alujas Diaz
, Mohsen Ben Haha
, Karen Scrivener

^*Corresponding author for this work

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

597 Citations (Scopus)

Abstract

The present paper introduces a new rapid, relevant and reliable (R³) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95%. The test is based on the correlation between the chemical reactivity of calcined clays in a simplified system and the compressive strength of blends in standard mortar. The simplified system consists of calcined clay portlandite and limestone pastes with sulfate and alkali levels adjusted to reproduce the reaction environment of hydrating blended cements. The pastes were hydrated for 6 days at 20 °C or for 1 day at 40 °C. The chemical reactivity of the calcined clay can be obtained first by measurement of the heat release during reaction using isothermal calorimetry and second by bound water determination in a heating step between 110 °C and 400 °C. Very good correlations were found between the mortar compressive strength and both measures of chemical reactivity.

Original language	English
Pages (from-to)	1-11
Number of pages	11
Journal	Cement and Concrete Research
Volume	85
DOIs	https://doi.org/10.1016/j.cemconres.2016.02.015
Publication status	Published - 1 Jul 2016
Externally published	Yes

Keywords

CaCO (D)
Calorimetry (A)
Hydration (A)
Kaolinitic calcined clays
Thermal treatment (A)

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10.1016/j.cemconres.2016.02.015

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title = "Development of a new rapid, relevant and reliable (R3) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays",

abstract = "The present paper introduces a new rapid, relevant and reliable (R3) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95\%. The test is based on the correlation between the chemical reactivity of calcined clays in a simplified system and the compressive strength of blends in standard mortar. The simplified system consists of calcined clay portlandite and limestone pastes with sulfate and alkali levels adjusted to reproduce the reaction environment of hydrating blended cements. The pastes were hydrated for 6 days at 20 °C or for 1 day at 40 °C. The chemical reactivity of the calcined clay can be obtained first by measurement of the heat release during reaction using isothermal calorimetry and second by bound water determination in a heating step between 110 °C and 400 °C. Very good correlations were found between the mortar compressive strength and both measures of chemical reactivity.",

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author = "Fran{\c c}ois Avet and Ruben Snellings and \{Alujas Diaz\}, Adrian and \{Ben Haha\}, Mohsen and Karen Scrivener",

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doi = "10.1016/j.cemconres.2016.02.015",

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journal = "Cement and Concrete Research",

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AU - Avet, François

AU - Snellings, Ruben

AU - Alujas Diaz, Adrian

AU - Ben Haha, Mohsen

AU - Scrivener, Karen

PY - 2016/7/1

Y1 - 2016/7/1

N2 - The present paper introduces a new rapid, relevant and reliable (R3) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95%. The test is based on the correlation between the chemical reactivity of calcined clays in a simplified system and the compressive strength of blends in standard mortar. The simplified system consists of calcined clay portlandite and limestone pastes with sulfate and alkali levels adjusted to reproduce the reaction environment of hydrating blended cements. The pastes were hydrated for 6 days at 20 °C or for 1 day at 40 °C. The chemical reactivity of the calcined clay can be obtained first by measurement of the heat release during reaction using isothermal calorimetry and second by bound water determination in a heating step between 110 °C and 400 °C. Very good correlations were found between the mortar compressive strength and both measures of chemical reactivity.

AB - The present paper introduces a new rapid, relevant and reliable (R3) test to predict the pozzolanic activity of calcined clays with kaolinite contents ranging from 0 to 95%. The test is based on the correlation between the chemical reactivity of calcined clays in a simplified system and the compressive strength of blends in standard mortar. The simplified system consists of calcined clay portlandite and limestone pastes with sulfate and alkali levels adjusted to reproduce the reaction environment of hydrating blended cements. The pastes were hydrated for 6 days at 20 °C or for 1 day at 40 °C. The chemical reactivity of the calcined clay can be obtained first by measurement of the heat release during reaction using isothermal calorimetry and second by bound water determination in a heating step between 110 °C and 400 °C. Very good correlations were found between the mortar compressive strength and both measures of chemical reactivity.

KW - CaCO (D)

KW - Calorimetry (A)

KW - Hydration (A)

KW - Kaolinitic calcined clays

KW - Thermal treatment (A)

UR - https://www.scopus.com/pages/publications/84964058389

U2 - 10.1016/j.cemconres.2016.02.015

DO - 10.1016/j.cemconres.2016.02.015

M3 - Article

AN - SCOPUS:84964058389

SN - 0008-8846

VL - 85

SP - 1

EP - 11

JO - Cement and Concrete Research

JF - Cement and Concrete Research

ER -

Development of a new rapid, relevant and reliable (R³) test method to evaluate the pozzolanic reactivity of calcined kaolinitic clays

Abstract

Keywords

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