Use of Perlite Powder to Suppress the Alkali-Silica Reaction

The authors examined the efficacy of perlite powder as an admixture in suppressing alkali-silica expansion. They studied the expansion of mortar bars containing various amounts of silica fume (SF), expanded perlite, and natural perlite. Highly reactive river aggregate containing opal and marginally reactive monzo-diorite aggregate, which are two types of reactive aggregates, were used. Expanded perlite and silica fume were tested with both aggregates, separately; however, natural perlite was tested only with monzo-diorite aggregate. The bars were cast in accordance with American Society for Testing and Materials (ASTM) C1260 protocol, accelerated mortar bar method, and were stored in sodium hydroxide (NaOH) solution for 30 days. Length changes were measured. This study showed that when incorporated into concrete mortar bars, perlite powder in both its natural and expanded states have potential to suppress expansion induced by alkali�silica reaction. The effectiveness of expanded perlite may be based on both pozzolanic activity and on the space provided for the gel accommodation due to its porous nature. Further research is required to determine the precise suppression mechanism.

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  • Authors:
    • Bektas, F
    • Turanli, L
    • Monteiro, P J M
  • Publication Date: 2005-10

Language

  • English

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Filing Info

  • Accession Number: 01011015
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 26 2005 6:53PM