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Maclennan, S.
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The effect of alkali activation on absorption capacity of SAP in ground granulated blast furnace slag (GGBS) and copper slag (CS) solutions
Abstract
This paper discusses the effect of ground granulated blast furnace slag (GGBS) and copper slag (CS) precursor replacement on the sorption characteristics of different superabsorbent (SAP) polymers in alkali activated cement (AAC) solutions. The precursor combinations which have been tested are 100:0, 75:25,<br/>50:50, 25/75 and 0:100 of GGBS and CS respectively. The tea bag test method has been utilised in this study to evaluate the mass of fluid absorbed. This method can give comparison to the volume of fluid absorbed by the SAP in different pore water solution environments. Sodium Silicate Ms = 2.05 @ 6.5% Na2O by mass of precursor was maintained and compared with the same<br/>precursor combination in de-ionised water. Two SAPs with different chemical compositions and particles size distributions have been used. Quantitative data has been collected chronologically in order to assess the effect of activator on the rate and mass of fluid absorbed. Additionally, pH and temperature measurements have been monitored throughout the test. The fundamental outcome of the study is that the addition of activator and inclusion of copper slag can reduce the absorption capacity of SAP. Particle size of SAP has less of an impact on the rate of absorption than initially expected.