Open AccessThe use of limestone sludge for the geopolymer preparation
Author(s) -
Dana Kubátová,
I Khongova,
M Krejci Kotlanova,
Anežka Zezulová,
Martin Boháč
Publication year - 2021
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/1205/1/012002
Subject(s) - metakaolin , compressive strength , geopolymer , materials science , ground granulated blast furnace slag , durability , metallurgy , composite material , pulp and paper industry , waste management , cement , engineering
The study investigates the effect of sludge waste from mining and washing of limestone on the properties of geopolymer binders based on metakaolin and blast furnace slag. The effect of adding two types of limestone sludge on workability, setting time, compressive strengths, durability and pore distribution was investigated. Limestone sludge was dosed in an amount of 0–30 %. Sodium water glass was used as an alkaline activator in the ratio of 5:4. A linear correlation between the flowability and limestone sludge content was observed, and very satisfactory results of compressive strength after 90 days were obtained for samples with sodium water glass (about 55 MPa). The positive effect of CaCO 3 on strength was confirmed. The increased content of clay components resulted in a reduction of compressive strength.