Hydration of alinite cement produced from soda waste sludge

Ucal G. O., Mahyar M., TOKYAY M.

CONSTRUCTION AND BUILDING MATERIALS, vol.164, pp.178-184, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 164
  • Publication Date: 2018
  • Doi Number: 10.1016/j.conbuildmat.2017.12.196
  • Journal Name: CONSTRUCTION AND BUILDING MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.178-184
  • Keywords: Alinite cement, Soda waste sludge, Low-energy cement, Hydration, INCINERATION FLY-ASH
  • Middle East Technical University Affiliated: Yes

Abstract

Alinite cement is an alternative inorganic, low-energy binding material. This experimental study investigated hydration characteristics of alinite cement which was produced by using soda waste sludge as a raw material. Paste microstructures were studied by X-ray powder diffraction and scanning electron microscopy. Heat of hydration and compressive strength values were also determined. Formation of C-S-H gel and calcium chloroaluminate hydrates which resemble Friedel's salt was observed. Induction period of alinite cement was around 15-20 min and unlike Portland cement, hydration did not practically stop during this period. Up to 12% gypsum addition to alinite cement resulted in increased compressive strength. (C) 2017 Elsevier Ltd. All rights reserved.