Effect of calcium hydroxide on fresh state behavior of sodium carbonate activated blast furnace slag pastes

Aktürk B., Kızılkanat A. B., Kabay N.

CONSTRUCTION AND BUILDING MATERIALS, cilt.212, ss.388-399, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 212
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.conbuildmat.2019.03.328
  • Dergi Adı: CONSTRUCTION AND BUILDING MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.388-399
  • Anahtar Kelimeler: Alkali activated materials, Sodium carbonate, Slag, Calcium hydroxide, Fresh properties, Carbonate concentration, MECHANICAL-PROPERTIES, PORE SOLUTION, ALKALINE ACTIVATION, REACTION-KINETICS, WASTE GLASS, CEMENT, RHEOLOGY, HYDRATION, STRENGTH, CONCRETE
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

This study represents the fresh state behavior of Na2CO3-activated ground granulated blast furnace slag (GGBS) pastes. Sodium carbonate (NC) is a suitable activator, though with an extended setting time. To accelerate the hydration process, NC was replaced with sodium hydroxide (NH), then, slaked lime (CH) was used as a carbonate binding agent. This replacement improved the rheological properties, but increased the setting time. The use of 3% CH with GGBS caused a significant decrease in setting time, enabled to set within 6.5 h. The decrement was attributed to the removal of a large amount of dissolved carbonate ions from the fresh state pastes. The NH replacement did not effectively enhance the fresh properties. In the pore solution, the CO32- ion concentration is one of the major parameter that affects the reaction besides other ions released from raw material. (C) 2019 Elsevier Ltd. All rights reserved.