Effect of Coffee Grounds Addition on Efflorescence in Fly Ash-based Geopolymer

The article aim is to analyse the influence of addition of the cheap and environmental friendly material that can reduce - coffee grounds on the efflorescence effect. The additives should reduce this effect trough decreasing pH. The geopolymer matrix was prepared from fly ash from Skawina CHP plant...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-10, Vol.416 (1), p.12035
Main Authors: Mierzwiński, D, Korniejenko, K, Łach, M, Mikuła, J, Krzywda, J
Format: Article
Language:English
Subjects:
Absorptivity
Additives
Coffee
Compressive strength
Efflorescence
Empirical analysis
Fly ash
Geopolymers
Reduction
Sodium hydroxide
Sodium silicates
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Summary:The article aim is to analyse the influence of addition of the cheap and environmental friendly material that can reduce - coffee grounds on the efflorescence effect. The additives should reduce this effect trough decreasing pH. The geopolymer matrix was prepared from fly ash from Skawina CHP plant and sand in ratio 1:1. The samples were prepared using sodium promoter - 12M sodium hydroxide solution combined with the sodium silicate solution and coffee grounds (1, 3 and 5% by mass of the composite). The samples were prepared according to the methodology described in the standard EN 12390-1. The empirical part of the research is based on: visual analyse for efflorescence, absorptivity test, pH test and compressive strength test. The results show the influence of coffee grounds on the pH reduction from about 11 to 9.21, the elimination of efflorescence and the reduction of the compressive strength.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/416/1/012035