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Rate of sulphuric acid penetration in a geopolymer concrete
This paper presents the results of an experimental investigation to study the rate of sulphuric acid penetration in a Geopolymer concrete. Cubic samples were made with a fly ash based Geopolymer concrete, epoxy coated except for one surface and immersed in a 10% sulphuric acid. At each time after immersion in the acid for 7, 28, 56, 84, 140 and 180 days, two samples were split and tested with a Universal pH Indicator for pH variations across the sections. Three distinct layers, in the colour of pink, yellow and light blue, were observed on the sample sections with the pH value of approximate 3, 7 and 11 respectively. The yellowish transitional zone with the pH of approximate 7 was found to be rather narrow between the unaffected zone (light blue) and the acid attacked zone (pink). EPMA (electron probe microanalysis) was conducted to study the distribution profiles of the element sodium (Na) and sulphur (S) in the selected sample areas. The results correlated well with the pH variations and the significant changes in the distribution profile of Na and S. Based on the experimental data up to 180 days, the acid affected depth including both the pink and yellow coloured zones were found to be proportional to the square root of immersion time. An empirical formula has been developed by regression analysis for evaluation of the rate of sulphuric acid penetration into the fly ash based Geopolymer concrete.
Rate of sulphuric acid penetration in a geopolymer concrete
This paper presents the results of an experimental investigation to study the rate of sulphuric acid penetration in a Geopolymer concrete. Cubic samples were made with a fly ash based Geopolymer concrete, epoxy coated except for one surface and immersed in a 10% sulphuric acid. At each time after immersion in the acid for 7, 28, 56, 84, 140 and 180 days, two samples were split and tested with a Universal pH Indicator for pH variations across the sections. Three distinct layers, in the colour of pink, yellow and light blue, were observed on the sample sections with the pH value of approximate 3, 7 and 11 respectively. The yellowish transitional zone with the pH of approximate 7 was found to be rather narrow between the unaffected zone (light blue) and the acid attacked zone (pink). EPMA (electron probe microanalysis) was conducted to study the distribution profiles of the element sodium (Na) and sulphur (S) in the selected sample areas. The results correlated well with the pH variations and the significant changes in the distribution profile of Na and S. Based on the experimental data up to 180 days, the acid affected depth including both the pink and yellow coloured zones were found to be proportional to the square root of immersion time. An empirical formula has been developed by regression analysis for evaluation of the rate of sulphuric acid penetration into the fly ash based Geopolymer concrete.
Rate of sulphuric acid penetration in a geopolymer concrete
Eindringgeschwindigkeit von Schwefelsäure in einen Geopolymer-Beton
Song, Xiujiang (author) / Marosszeky, Marton (author) / Chang, Zhen-Tian (author)
2008
10 Seiten, 10 Bilder, 2 Tabellen, 10 Quellen
Conference paper
English
Beton , Geopolymer , anorganisches Polymer , Flugasche , chemische Zusammensetzung , Flüssigpenetrationsprüfung , Schwefelsäure , wässrige Lösung , Ausbreitungsgeschwindigkeit , Langzeitverhalten , Tiefenprofil (Abstand unter Oberfläche) , Konzentrationsverteilung , Natrium , Schwefel , Elektronenmikrosondenanalyse , Verfahrensparameter , Alkalinität , Druckfestigkeit , Rasterelektronenmikroskopie , energiedispersive Spektrometrie , empirische Formel , Tagungsbericht
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