Effect of large amounts of natural pozzolan addition on properties of blended cements

Turanli L., Uzal B., Bektas F.

CEMENT AND CONCRETE RESEARCH, cilt.35, sa.6, ss.1106-1111, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Sayı: 6
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.cemconres.2004.07.022
  • Dergi Adı: CEMENT AND CONCRETE RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1106-1111
  • Anahtar Kelimeler: alkali-aggregate reaction, blended cement, compressive strength, pozzolan, sulfate attack, HIGH-VOLUME
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

In this study, the effects of 35, 45, and 55 wt.% natural pozzolan addition on the properties of blended cement pastes and mortars were investigated. Blended cements with 450 m(2) /kg Blaine fineness were produced from a Turkish volcanic tuff in a laboratory mill by intergrinding portland cement clinker, natural pozzolan, and gypsum. The cements were tested for particle size distribution, setting time, heat of hydration, compressive strength, alkali-silica activity, and sulfate resistance. Cement pastes were tested by TGA for Ca(OH)(2) content and by XRD for the crystalline hydration products. The compressive strength of the mortars made with blended cements containing large amounts of natural pozzolan was lower than that of the portland cement at all tested ages up to 91 days. Blended cements containing large amounts of pozzolan exhibited much less expansion with respect to portland cement in accelerated alkali-silica test and in a 36-week sulfate immersion test. (c) 2004 Elsevier Ltd. All rights reserved.