The origin of the pozzolanic activity of calcined clay minerals: A comparison between kaolinite, illite and montmorillonite

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.09.013· OSTI ID:21490050

Fernandez, Rodrigo ^[1]; Martirena, Fernando ^[2]; Scrivener, Karen L ^[1]

---

1. Laboratory of Construction Materials, IMX, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne (Switzerland)
2. Centro de Investigacion y Desarrollo de Estructuras y Materiales (CIDEM), Universidad Central 'Marta Abreu' de Las Villas, 54830 Santa Clara (Cuba)

This paper investigates the decomposition of three clayey structures (kaolinite, illite and montmorillonite) when thermally treated at 600 {sup o}C and 800 {sup o}C and the effect of this treatment on their pozzolanic activity in cementitious materials. Raw and calcined clay minerals were characterized by the XRF, XRD, {sup 27}Al NMR, DTG and BET techniques. Cement pastes and mortars were produced with a 30% substitution by calcined clay minerals. The pozzolanic activity and the degree of hydration of the clinker component were monitored on pastes using DTG and BSE-IA, respectively. Compressive strength and sorptivity properties were assessed on standard mortars. It was shown that kaolinite, due to the amount and location of OH groups in its structure, has a different decomposition process than illite or montmorillonite, which results in an important loss of crystallinity. This explains its enhanced pozzolanic activity compared to other calcined clay-cement blends.

• OSTI ID: 21490050
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 1; Other Information: DOI: 10.1016/j.cemconres.2010.09.013; PII: S0008-8846(10)00217-6; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CEMENTS
COMPARATIVE EVALUATIONS
COMPRESSION STRENGTH
DECOMPOSITION
HYDRATION
ILLITE
KAOLINITE
MICROSTRUCTURE
MONTMORILLONITE
MORTARS
NUCLEAR MAGNETIC RESONANCE
STANDARDS
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
BUILDING MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CLAYS
COHERENT SCATTERING
DIFFRACTION
EVALUATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NONDESTRUCTIVE ANALYSIS
RESONANCE
SCATTERING
SILICATE MINERALS
SOLVATION
TEMPERATURE RANGE
X-RAY EMISSION ANALYSIS