Pozzolanic reactivity of low grade kaolinitic clays: Influence of mineralogical composition

Adrián Alujas; Roger S. Almenares; Sergio Betancourt; Carlos Leyva

doi:10.1007/978-94-017-9939-3_42

Pozzolanic reactivity of low grade kaolinitic clays: Influence of mineralogical composition

Adrián Alujas^*
, Roger S. Almenares
, Sergio Betancourt
, Carlos Leyva

^*Corresponding author for this work

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

19 Citations (Scopus)

Abstract

The influence of chemical and mineralogical composition of five Cuban clays in the pozzolanic reactivity of its calcination products is studied in this research. Raw materials were chemically and mineralogically characterized by XRF, XRD and TGA. Pozzolanic reactivity of 800 °C calcination products was evaluated by heat released in chemically modified lime-pozzolan pastes, and by compressive strength in mortars with a 30% substitution of OPC by calcined clays. Preliminary results shown that pozzolanic reactivity of clays calcined at temperatures that guarantees a complete dehydroxylation of the raw materials could be qualitatively assessed by its relative positions along the diagonal trend in an Al₂O₃–SiO₂–OH⁻ ternary plot, where pozzolanic reactivity is related to the percent of structural hydroxyl groups and the percent of Al₂O₃ in the raw material. Conducted pozzolanic reactivity test highlight the potential of kaolinite rich red clay soils as source for the obtaining of highly reactive pozzolanic materials.

Original language	English
Pages (from-to)	339-345
Number of pages	7
Journal	RILEM Bookseries
Volume	10
DOIs	https://doi.org/10.1007/978-94-017-9939-3_42
Publication status	Published - 2015
Externally published	Yes

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title = "Pozzolanic reactivity of low grade kaolinitic clays: Influence of mineralogical composition",

abstract = "The influence of chemical and mineralogical composition of five Cuban clays in the pozzolanic reactivity of its calcination products is studied in this research. Raw materials were chemically and mineralogically characterized by XRF, XRD and TGA. Pozzolanic reactivity of 800 °C calcination products was evaluated by heat released in chemically modified lime-pozzolan pastes, and by compressive strength in mortars with a 30\% substitution of OPC by calcined clays. Preliminary results shown that pozzolanic reactivity of clays calcined at temperatures that guarantees a complete dehydroxylation of the raw materials could be qualitatively assessed by its relative positions along the diagonal trend in an Al2O3–SiO2–OH− ternary plot, where pozzolanic reactivity is related to the percent of structural hydroxyl groups and the percent of Al2O3 in the raw material. Conducted pozzolanic reactivity test highlight the potential of kaolinite rich red clay soils as source for the obtaining of highly reactive pozzolanic materials.",

author = "Adri{\'a}n Alujas and Almenares, \{Roger S.\} and Sergio Betancourt and Carlos Leyva",

note = "Publisher Copyright: {\textcopyright} RILEM 2015.",

year = "2015",

doi = "10.1007/978-94-017-9939-3\_42",

language = "English",

volume = "10",

pages = "339--345",

journal = "RILEM Bookseries",

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}

TY - JOUR

T1 - Pozzolanic reactivity of low grade kaolinitic clays

T2 - Influence of mineralogical composition

AU - Alujas, Adrián

AU - Almenares, Roger S.

AU - Betancourt, Sergio

AU - Leyva, Carlos

PY - 2015

Y1 - 2015

N2 - The influence of chemical and mineralogical composition of five Cuban clays in the pozzolanic reactivity of its calcination products is studied in this research. Raw materials were chemically and mineralogically characterized by XRF, XRD and TGA. Pozzolanic reactivity of 800 °C calcination products was evaluated by heat released in chemically modified lime-pozzolan pastes, and by compressive strength in mortars with a 30% substitution of OPC by calcined clays. Preliminary results shown that pozzolanic reactivity of clays calcined at temperatures that guarantees a complete dehydroxylation of the raw materials could be qualitatively assessed by its relative positions along the diagonal trend in an Al2O3–SiO2–OH− ternary plot, where pozzolanic reactivity is related to the percent of structural hydroxyl groups and the percent of Al2O3 in the raw material. Conducted pozzolanic reactivity test highlight the potential of kaolinite rich red clay soils as source for the obtaining of highly reactive pozzolanic materials.

AB - The influence of chemical and mineralogical composition of five Cuban clays in the pozzolanic reactivity of its calcination products is studied in this research. Raw materials were chemically and mineralogically characterized by XRF, XRD and TGA. Pozzolanic reactivity of 800 °C calcination products was evaluated by heat released in chemically modified lime-pozzolan pastes, and by compressive strength in mortars with a 30% substitution of OPC by calcined clays. Preliminary results shown that pozzolanic reactivity of clays calcined at temperatures that guarantees a complete dehydroxylation of the raw materials could be qualitatively assessed by its relative positions along the diagonal trend in an Al2O3–SiO2–OH− ternary plot, where pozzolanic reactivity is related to the percent of structural hydroxyl groups and the percent of Al2O3 in the raw material. Conducted pozzolanic reactivity test highlight the potential of kaolinite rich red clay soils as source for the obtaining of highly reactive pozzolanic materials.

UR - https://www.scopus.com/pages/publications/84930941598

U2 - 10.1007/978-94-017-9939-3_42

DO - 10.1007/978-94-017-9939-3_42

M3 - Article

AN - SCOPUS:84930941598

SN - 2211-0844

VL - 10

SP - 339

EP - 345

JO - RILEM Bookseries

JF - RILEM Bookseries

ER -

Pozzolanic reactivity of low grade kaolinitic clays: Influence of mineralogical composition

Abstract

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