TY  - JOUR
SN  - 02728842
N2  - Geopolymer-based coatings exhibit good fire inhibition, temper resistance, and anticorrosion properties. In this study, coal fly ash-based geopolymers were investigated as coating materials. Two variables, namely, Na/Al and water/solid ratios, were used to study the effect of the chemical composition of geopolymer on adhesion strength, setting time, microstructure, and thermal stability (up to 800 °C). Maximum adhesion strength (3.8 MPa) was achieved using Na/Al and water/solid ratios of 1.0 and 0.33, respectively. The coatings attained their maximum strength in 3 days at 60 °C, and additional curing time up to 6 months did not affect adhesion strength. No direct or indirect relationship was found between setting time and adhesion strength. The amount of water notably altered adhesion strength, setting time, and microstructure of the polymers. Microstructural investigations revealed formation of mesoporous polymeric structure, unreacted fly ash, and zeolite-like fibrous morphologies. A new and simple method for the quantitative analysis of geopolymer was developed using Fourier transform infrared spectroscopy (FTIR). FTIR peak-fitting method showed that geopolymer yield was between 50 and 70, which was comparable to the result of acid-leaching method. The coating formulations were thermally inactive up to 800 °C with a mass loss of 11-12 mostly because of dehydroxylation. Na/Al and water/solid ratios had no effect on the thermal properties of the geopolymer. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
IS  - 2
KW  - Adhesion; Bond strength (materials); Chemical stability; Coal ash; Coatings; Corrosion resistant coatings; Fire resistance; Fly ash; Fourier transform infrared spectroscopy; Geopolymers; Inorganic polymers; Microstructure; Plating; Silicates; Thermodynamic properties; Zeolites
KW  -  Anti-corrosion property; Chemical compositions; Coating formulations; Fibrous morphology; Geopolymer; Microstructural investigation; Polymeric structures; Temper resistance
KW  -  Sodium compounds
TI  - Sodium silicate-free geopolymers as coating materials: Effects of Na/Al and water/solid ratios on adhesion strength
ID  - scholars6012
EP  - 2805
PB  - Elsevier Ltd
SP  - 2794
AV  - none
Y1  - 2015///
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84919462253&doi=10.1016%2fj.ceramint.2014.10.099&partnerID=40&md5=29e3707fc8520fd78b811679d6b028e6
N1  - cited By 77
A1  - Irfan Khan, M.
A1  - Azizli, K.
A1  - Sufian, S.
A1  - Man, Z.
JF  - Ceramics International
VL  - 41
ER  -