TITLE:
An Alkali Activated Binder for High Chemical Resistant Self-Leveling Mortar
AUTHORS:
Henrik L. Funke, Sandra Gelbrich, Lothar Kroll
KEYWORDS:
Alkali Activated Binder, Geopolymer, Durability, Chemical Resistance
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.6 No.4,
October
12,
2016
ABSTRACT: This paper reports the
development of an Alkali Activated Binder (AAB) with an emphasis on the
performance and the durability of the AAB-matrix. For the development of the
matrix, the reactive components granulated slag and coal fly ash were used,
which were alkali activated with a mixture of sodium hydroxide (2 - 10 mol/l)
and aqueous sodium silicate solution (SiO2/Na2O molar
ratio: 2.1) at ambient temperature. A sodium hydroxide concentration of 5.5
mol/l revealed the best compromise between setting time and mechanical
strengths of the AAB. With this sodium hydroxide concentration, the compressive
and the 3-point bending tensile strength of the hardened AAB were 53.4 and 5.5 MPa
respectively after 14 days. As a result of the investigation of the acid resistance,
the AAB-matrix showed a very high acid resistance in comparison to ordinary
Portland cement concrete. In addition, the AAB had a high frost resistance,
which had been
validated by the capillary suction, internal damage and freeze thaw test with a
relative dynamic E-Modulus of 93% and a total amount of scaled material of 30
g/m2 after 28 freeze-thaw cycles (exposure class: XF3).