Open AccessDevelopment of non-shrinkable cement based on local raw materials
Author(s) -
Armine Meymaryan,
Nikolay Chilingaryan,
Marine Kalantaryan,
S. Khachatryan
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/698/2/022080
Subject(s) - ettringite , cement , raw material , gypsum , portland cement , mortar , materials science , environmental science , waste management , pulp and paper industry , metallurgy , composite material , chemistry , engineering , organic chemistry
With an analysis of world practice in the production of non-shrinkable and expandable cement mortars and structures, the basic methods for their preparation are revealed. The main directions of their production are established based on the use of special expanding cements developed by various authors. An analysis of the above mentioned methods revealed that for the Republic of Armenia the most accessible method is the development of a special additive and its introduction into conventional Portland cement. Investigating the mineral base of the RA, a special additive was developed on the base of dust absorbed from exhaust gases of cement plants furnaces, by which it is possible to obtain non-shrinkable and expandable cements. Different ratios are determined at 800-1100 °C. The study revealed that at a ratio of 40:60 and 45:55 (gypsum: dust), the additive obtained at 1000°C contains a sufficient amount of ettringite, the main mineral for expansion. The expansion effects of the developed additives were studied, its optimal ratio corresponding to 10 percent by mass of cement was established.