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Title: Lithological influence of aggregate in the alkali-carbonate reaction

Abstract

The reactivity of carbonate rock with the alkali content of cement, commonly called alkali-carbonate reaction (ACR), has been investigated. Alkali-silica reaction (ASR) can also contribute in the alkali-aggregate reaction (AAR) in carbonate rock, mainly due to micro- and crypto-crystalline quartz or clay content in carbonate aggregate. Both ACR and ASR can occur in the same system, as has been also evidenced on this paper. Carbonate aggregate samples were selected using lithological reactivity criteria, taking into account the presence of dedolomitization, partial dolomitization, micro- and crypto-crystalline quartz. Selected rocks include calcitic dolostone with chert (CDX), calcitic dolostone with dedolomitization (CDD), limestone with chert (LX), marly calcitic dolostone with partial dolomitization (CD), high-porosity ferric dolostone with clays (FD). To evaluate the reactivity, aggregates were studied using expansion tests following RILEM AAR-2, AAR-5, a modification using LiOH AAR-5Li was also tested. A complementary study was done using petrographic monitoring with polarised light microscopy on aggregates immersed in NaOH and LiOH solutions after different ages. SEM-EDAX has been used to identify the presence of brucite as a product of dedolomitization. An ACR reaction showed shrinkage of the mortar bars in alkaline solutions explained by induced dedolomitization, while an ASR process typically displayed expansion. Neithermore » shrinkage nor expansion was observed when mortar bars were immersed in solutions of lithium hydroxide. Carbonate aggregate classification with AAR pathology risk has been elaborated based on mechanical behaviours by expansion and shrinkage. It is proposed to be used as a petrographic method for AAR diagnosis to complement the RILEM AAR1 specifically for carbonate aggregate. Aggregate materials can be classified as I (non-reactive), II (potentially reactive), and III (probably reactive), considering induced dedolomitization ACR (dedolomitization degree) and ASR.« less

Authors:
 [1];  [2];  [3]
  1. AIDICO-Unida Tecnica del Marmol, Cami de Castella, 4. 03660-Novelda, Alicante (Spain). E-mail: angel.lopez@aidico.es
  2. AIDICO, Benjamin Franklin, 17. 46980-Paterna, Valencia (Spain). E-mail: vcliment@grupogla.com
  3. AIDICO-Unida Tecnica del Marmol, Cami de Castella, 4. 03660-Novelda, Alicante (Spain)
Publication Date:
OSTI Identifier:
20871567
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 36; Journal Issue: 8; Conference: 10. EUROSEMINAR on microscopy applied to building materials, Paisley, Scotland (United Kingdom), 21-25 Jun 2005; Other Information: DOI: 10.1016/j.cemconres.2006.05.032; PII: S0008-8846(06)00159-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBONATES; CEMENTS; CLAYS; CONCRETES; EXPANSION; LIMESTONE; LITHIUM HYDROXIDES; MORTARS; POROSITY; QUARTZ; REACTIVITY; SCANNING ELECTRON MICROSCOPY; SHRINKAGE; SILICA; SODIUM HYDROXIDES

Citation Formats

Lopez-Buendia, A.M., Climent, V., and Verdu, P. Lithological influence of aggregate in the alkali-carbonate reaction. United States: N. p., 2006. Web. doi:10.1016/j.cemconres.2006.05.032.
Lopez-Buendia, A.M., Climent, V., & Verdu, P. Lithological influence of aggregate in the alkali-carbonate reaction. United States. doi:10.1016/j.cemconres.2006.05.032.
Lopez-Buendia, A.M., Climent, V., and Verdu, P. Tue . "Lithological influence of aggregate in the alkali-carbonate reaction". United States. doi:10.1016/j.cemconres.2006.05.032.
@article{osti_20871567,
title = {Lithological influence of aggregate in the alkali-carbonate reaction},
author = {Lopez-Buendia, A.M. and Climent, V. and Verdu, P.},
abstractNote = {The reactivity of carbonate rock with the alkali content of cement, commonly called alkali-carbonate reaction (ACR), has been investigated. Alkali-silica reaction (ASR) can also contribute in the alkali-aggregate reaction (AAR) in carbonate rock, mainly due to micro- and crypto-crystalline quartz or clay content in carbonate aggregate. Both ACR and ASR can occur in the same system, as has been also evidenced on this paper. Carbonate aggregate samples were selected using lithological reactivity criteria, taking into account the presence of dedolomitization, partial dolomitization, micro- and crypto-crystalline quartz. Selected rocks include calcitic dolostone with chert (CDX), calcitic dolostone with dedolomitization (CDD), limestone with chert (LX), marly calcitic dolostone with partial dolomitization (CD), high-porosity ferric dolostone with clays (FD). To evaluate the reactivity, aggregates were studied using expansion tests following RILEM AAR-2, AAR-5, a modification using LiOH AAR-5Li was also tested. A complementary study was done using petrographic monitoring with polarised light microscopy on aggregates immersed in NaOH and LiOH solutions after different ages. SEM-EDAX has been used to identify the presence of brucite as a product of dedolomitization. An ACR reaction showed shrinkage of the mortar bars in alkaline solutions explained by induced dedolomitization, while an ASR process typically displayed expansion. Neither shrinkage nor expansion was observed when mortar bars were immersed in solutions of lithium hydroxide. Carbonate aggregate classification with AAR pathology risk has been elaborated based on mechanical behaviours by expansion and shrinkage. It is proposed to be used as a petrographic method for AAR diagnosis to complement the RILEM AAR1 specifically for carbonate aggregate. Aggregate materials can be classified as I (non-reactive), II (potentially reactive), and III (probably reactive), considering induced dedolomitization ACR (dedolomitization degree) and ASR.},
doi = {10.1016/j.cemconres.2006.05.032},
journal = {Cement and Concrete Research},
number = 8,
volume = 36,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2006},
month = {Tue Aug 15 00:00:00 EDT 2006}
}