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Study on Shrinkage Cracking Morphology of Cement Mortar with Different Nanoclay Particles under Restraint

Auteur(s): ORCID


ORCID
Médium: article de revue
Langue(s): anglais
Publié dans: Buildings, , n. 9, v. 12
Page(s): 1459
DOI: 10.3390/buildings12091459
Abstrait:

In this paper,different types and particle sizes of nanoclay(nano-metakaolin—NMK—and nano-attapulgite—NMA—clay) were selected to study the effect of nanoclay on the properties of cement-based cementitious materials. The stability of different nanoclay dispersions wasanalyzed. The effects of nanoclay on the mechanical properties and cracking behavior of cement mortar were discussed. The crack propagation behavior of nanoclay cement mortar was analyzed by flatknife-edge induced constraint and ring constraintexperiments. The research shows that the degree of aggregation of NMA particles is lower than that of NMK. The larger the particle size of NMA, the lower the degree of particle aggregation. The larger the particle size of NMK, the lower the degree of particle aggregation in water.NMK has the best improvement effect on cement mortar. The smaller the particle size, the more pronounced the improvement effect. The flexural strength ratio, compressive strength ratio, and elastic modulus ratio of 7d and 28d are 76.7%, 67.4%, and 61.2%, respectively. In the flat plate cracking experiment, the maximum crack width of NMK-3 and NMA-2 was reduced by 33.3% and 25.0%, respectively, compared withordinary cement mortar. The maximum crack length was reduced by 55.1% and 33.1% compared with cement mortar. In the ring constraintexperiment, the total cracked area of NMK-1, NMA-1, NMK-3, and NMA-2 rings increased by 64.3%, 45.0%, 92.7%, and 49.7%, respectively, compared with ordinary cement mortar rings after 60 days. NMK can advance the cracking time of cement mortar, but it can inhibit the generation and development of cracks and refine the crack width.

Copyright: © 2022 by the authors; licensee MDPI, Basel, Switzerland.
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
    10692585
  • Publié(e) le:
    23.09.2022
  • Modifié(e) le:
    10.11.2022
 
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