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Calcium hydroxide influence in autogenous self-healing of cement-based materials in various environmental conditions

Auteur(s): ORCID
ORCID
ORCID
ORCID
ORCID
Médium: article de revue
Langue(s): portuguais
Publié dans: Ambiente Construído, , n. 2, v. 21
Page(s): 209-224
DOI: 10.1590/s1678-86212021000200522
Abstrait:

Several factors, such as chemical shrinkage or environmental attack can produce concrete cracks. Calcium hydroxide content from the environment or cement hydration can promote the self-healing phenomenon (SHP). This study evaluates the calcium hydroxide concentration influence on the self-healing phenomenon of cement-based materials. Cracked mortars with different types of cement, such as a filler, pozzolanic, and high initial strength, were exposed to four environmental conditions. Titration was the method proposed to determine the amount of calcium hydroxide content leached in the water, and the cracks closure were analyzed by optical microscopy. CPII F (Portland Cement, type II, compound with limestone) samples showed no trend to Ca(OH)2 leached, and to superficial cracking closure. Regarding CPV (Portland cement, type V, high initial strength cement) samples, their behavior showed the highest Ca(OH)2 content to all environmental exposure, and cracking closure to samples in submerged condition. Thus, a significant influence in the cracks´ closure regarding the presence of Ca2+ leached to the exposure environments, and a water source related to this behavior seems to be a primary factor to improve the SHP.

Copyright: © 2021 Deividi Maurente Gomes da Silva, Vanessa Giaretton Cappellesso, Maurício Germano Lopes Garcia, Angela Borges Masuero, Denise Carpena Coitinho Dal Molin
License:

Cette oeuvre a été publiée sous la license Creative Commons Attribution 4.0 (CC-BY 4.0). Il est autorisé de partager et adapter l'oeuvre tant que l'auteur est crédité et la license est indiquée (avec le lien ci-dessus). Vous devez aussi indiquer si des changements on été fait vis-à-vis de l'original.

  • Informations
    sur cette fiche
  • Reference-ID
    10603007
  • Publié(e) le:
    17.04.2021
  • Modifié(e) le:
    02.06.2021
 
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