Portland Limestone Cement Part II- Sulfate Resistance

TOSUN FELEKOĞLU K., FELEKOĞLU B., Baradan B., Altun I. A.

TEKNIK DERGI, cilt.20, sa.3, ss.4737-4757, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 20 Sayı: 3
  • Basım Tarihi: 2009
  • Dergi Adı: TEKNIK DERGI
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.4737-4757
  • Anahtar Kelimeler: limestone cement, sulfate attack, ettringite, thaumasite
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

This paper presents the second phase of a research project which is supported by TUBITAK titled "Determination of Optimum Limestone Content in Portland Limestone Cement Production from the View Point of Mechanical Performance and Sulfate Originated Durability Problems". In the first stage of this research, blended cements incorporating limestone powders were prepared [1]. In this part, mortar samples were prepared with the same cements and subjected to different environmental conditions (standard water curing, Na2SO4 solutions at different temperatures). Their performances in these conditions were investigated by compressive strength tests, length change measurements and micro-structural analyses. The main deterioration cause was formation of ettringite crystal. Gypsum and thaumasite formations were also observed. It may be concluded that; from the view point of strength and durability, maximum limestone replacement should not exceed 10%, especially for the structures that are constructed in sulfate bearing environments in cold regions.