Effects of nano-TiO2on strength, shrinkage and microstructure of alkali activated slag pastes

L. Y. Yang, Z. J. Jia, Y. M. Zhang, Jianguo Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

99 Citations (Scopus)

Abstract

For alkali-activated slag (AAS), high drying shrinkage is an obstacle which impedes its application as a construction material. In this investigation, nano-TiO2was added to AAS, and its mechanical properties and shrinkage were tested to examine its effect on hardened alkali-activated slag paste (AASP). To understand the impact of nano-TiO2on AASP at micro scale, FTIR, MIP and SEM were carried out. Experimental results indicate that the addition of nano-TiO2to AAS enhances the mechanical strength, and decreases the shrinkage of AASP. FTIR and SEM results demonstrated that the addition of nano-TiO2into the AASP accelerates its hydration process, resulting in more hydration products and denser structure. MIP results showed that the addition of nano-TiO2reduces the total porosity of AASP and changes the pore structure. The porosity of 1.25-25 nm mesopores, which is believed to be responsible for the high shrinkage of AASP, is remarkably reduced due to the addition of nano-TiO2.
Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalCement and Concrete Composites
Volume57
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Alkali activated slag
  • Microstructure
  • Shrinkage
  • Strength
  • TiO 2

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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