Title: Low-Energy Alinite Cement from Soda Sludge Waste

Author(s): Gültekin O. Uçal, Mahdi Mahyar, Mustafa Tokyay, and İsmail Ö. Yaman Synopsis:

Publication: Symposium Paper

Volume: 320

Issue:

Appears on pages(s): 3.1-3.8

Keywords: alinite cement, low-energy cement, soda sludge waste, waste utilization

DOI: 10.14359/51701041

Date: 8/1/2017

Abstract:
Alinite cement which was developed in 1970s is an alternative inorganic, low-energy binding material in which chlorine containing wastes can be utilized. Although potentially a suitable candidate, there is little research on utilization of soda sludge waste in cementitious systems. In this experimental study, synthesis and optimization of the properties of alinite cement by using soda sludge waste as a raw material was carried out by investigating optimum calcination temperature and calcination duration, chemical and mineralogical compositions, and hydration products. When raw meal was calcined at 1150oC for 2 hours, the resulting clinker contained alinite, belite, and calcium aluminochloride phases with sufficiently low free calcium oxide and alkali content. Upon hydration of ground alinite cement clinker and gypsum mixture, peaks of portlandite, Friedel’s salt-like phase, and calcium chloride silicate sulfate were distinguished in X-Ray diffractograms. Compressive strength tests of alinite cement mortars gave satisfactory results.