Study of Metakaolin-Based Geopolymer with Addition of Polymer Admixtures

Authors: Olesia Mikhailova, Pavel Rovnaník

Abstract:

In the present work, metakaolin-based geopolymer including different polymer admixtures was studied. Different types of commercial polymer admixtures VINNAPAS^® and polyethylene glycol of different relative molecular weight were used as polymer admixtures. The main objective of this work is to investigate the influence of different types of admixtures on the properties of metakaolin-based geopolymer mortars considering their different dosage. Mechanical properties, such as flexural and compressive strength were experimentally determined. Also, study of the microstructure of selected specimens by using a scanning electron microscope was performed. The results showed that the specimen with addition of 1.5% of VINNAPAS^® 7016 F and 10% of polyethylene glycol 400 achieved maximum mechanical properties.

Keywords: Metakaolin, geopolymer, polymer admixtures, mechanical properties, microstructure.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1128101

References:

[1] Davidovits J. Synthesis of new high temperature geopolymers for reinforced plastics/composites. SPE PACTEC 79 Society of Plastic Engineers, Brookfield Center; 1979, pp. 151–4.
[2] Andini S, Cioffi R, Colangelo F, Grieco T, Montagnaro F, Santoro L. Coal fly ash as raw material for the manufacture of geopolymer-based products. Waste Manage 2008; 28:416–23.
[3] Shi C, Krivenko P.V., Roy D. Alkali-activated cements and concretes. USA and Canada: Taylor and Francis; 2006.
[4] Bakharev T, Sanjayan JG, Cheng YB. Alkali activation of Australian slag cements. Cem Concr Res 1999; 29:113–20.
[5] Fernández-Jiménez A, Palomo JG, Puertas F. Alkali-activated slag mortars mechanical strength behavior. Cem Concr Res 1999; 29: 1313– 21.
[6] Chen W, Brouwers HJH. The hydration of slag. Part 1: Reaction models for alkali activated slag. J Mater Sci 2007; 42: 428–43.
[7] Bakharev T, Sanjayan JG, Cheng Y-B. Sulfate attack on alkali-activated slag concrete. Cem Concr Res 2002; 32: 211–6.
[8] Bakharev T, Sanjayan JG, Cheng Y-B. Resistance of alkali-activated slag concrete to acid attack. Cem Concr Res 2003; 33: 1607–11.
[9] Puertas F, Amat T, Fernández-Jiménez A, Vazquez T. Mechanical and durable behaviour of alkaline cement mortars reinforced with polypropylene fibers. Cem Concr Res 2003; 33: 2031–6.
[10] Rashad Alaa M, Khalil Mervat H. A preliminary study of alkali-activated slag blended with silica fume under the effect of thermal loads and thermal shock cycles. Construct Build Mater 2013; 40: 522–32.
[11] Rashad AM, Bai Y, Basheer PAM, Collier NC, Milestone NB. Chemical and mechanical stability of sodium sulfate activated slag after exposure to elevated temperature. Cem Concr Res 2012; 42: 333–43. 21
[12] Roy Della M, Jiang Weimin, Silsbee MR. Chloride diffusion in ordinary, blended, and alkali-activated cement pastes and its relation to other properties. Cem Concr Res 2000; 30: 1879–84.
[13] Shi C, Xie P. Interface between cement paste and quartz sand in alkali – activated slag mortars. Cem Concr Res 1998; 28: 887–96.
[14] Brough AR, Atkinson A. Automated identification of the aggregate-paste interfacial transition zone in mortars of silica sand Portland or alkali – activated slag cement paste. Cem Concr Res 2000; 30: 849–54.
[15] Živica V. Effects of type and dosage of alkaline activator and temperature on the properties of alkali-activated mixtures. Construct Build Mater 2007; 21:1463–9.
[16] Collins PG, Sanjayan JG. Workability and mechanical properties of alkali activated slag concrete. Cem Concr Res 1999; 29: 455–8.
[17] Bakharev T, Sanjayan JG, Cheng YB. Resistance of alkali-activated slag concrete to carbonation. Cem Concr Res 2001; 31: 1277–83.
[18] Hakkinen T. The influence of slag content on the microstructure, permeability, and mechanical properties. Cem Concr Res 1993; 23: 407–21.
[19] Collins F, Sanjayan JG. Cracking tendency of alkali activated slag subjected to restrained shrinkage. Cem Concr Res 2000; 30: 791–8.
[20] Xiao Yao, Zuhua Zhang, Huajun Zhu, Yue Chen, Geopolymerization process of alkali–metakaolinite characterized by isothermal calorimetry. Thermochimica Acta 493 (2009), pp. 49–54.