Materials and Structures

, Volume 31, Issue 4, pp 230–234 | Cite as

Improving the structure of the interfacial zone and its influence on the long-term behavior of mortars

  • Shen Yang
  • Xu Zhongzi
  • Tang Mingshu
Scientific Reports

Abstract

The structure of the interfacial zone between cement paste and aggregate was improved by using a pretreated quartz aggregate on whose surface the hydraulic mineral β−C2S was directly formed. The composition and morphology of the structure of the interfacial zone was examined, and its influence was studied by comparisons between mortars made with pretreated quartz aggregate and with normal quartz aggregate. The results showed that the composition and morphology of the interfacial zone were substantially improved by the hydration of the mineral β−C2S of the pretreated quartz aggregate. The influence of the interfacial structure on the strength of mortars was related to structural development. It appears to be slight at early hydration, but significant at late hydration.

Keywords

Compressive Strength Flexural Strength Portland Cement Hydrated Product Hydrated Calcium Silicate 

Résumé

La structure de la zone interfaciale entre la pâte de ciment et les granulats a été améliorée au moyen d’un granulat de quartz prétraité, sur la surface duquel le minéral hydraulique β−C2S s’est formé directement. La composition et la morphologie de la structure de la zone interfaciale ont été examinées, et l’influence de la structure sur la résistance a été étudiée par comparaison entre des mortiers à base de granulats de quartz pretraités et de granulats de quartz ordinaires. Les résultats ont montré que la composition et la morphologie de la zone interfaciale ont été améliorées de façon significative par l’hydratation du minéral β−C2S du granulat de quartz pretraité. On discute des influences de la structure interfaciale sur la résistance du mortier par rapport au développement de la structure. Cette influence est faible au début de l’hydratation, mais devient significative lors de l’hydratation avancée.

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Copyright information

© RILEM 1998

Authors and Affiliations

  • Shen Yang
    • 1
  • Xu Zhongzi
    • 1
  • Tang Mingshu
    • 1
  1. 1.Department of Materials Science and EngineeringNanjing University of Chemical TechnologyNanjingP. R. China

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