Abstract
The use of methods based on measuring electrical conductivity to assess pozzolanic activity has recently been used primarily in aqueous suspensions of pozzolan: calcium hydroxide. However, the use of similar methods in suspensions of cement with pozzolans has not been widely studied. This paper proposes a new method for rapid assessment of the pozzolanic activity of mineral admixtures in aqueous cement suspensions. In this study, the conditions for the application of the method were optimized, such as time, temperature, w/c ratio and dosage procedure. Finally, results are presented from the application of this method for characterizing the pozzolanic activity of the spent catalytic cracking catalyst. These results corroborate as previously reported, namely the high reactivity of this pozzolan obtained by other methods, such as thermogravimetry or evolution of the mechanical strength. In addition, the pozzolanic activity of the catalyst was compared with other pozzolans such as metakaolin and silica fume.
Highlights
The development of analytical methods that reduce assay time has always been a concern of researchers
There are very few references related to electrical conductivity studies of cement suspensions, and even less studies aimed at evaluating the pozzolanic activity of mineral admixtures in the presence of cement
They studied pozzolanic activity by measuring the electrical conductivity of suspensions obtained by mixing several pozzolans using a solution obtained from the filtration of a mix of Portland cement and water
Summary
The development of analytical methods that reduce assay time has always been a concern of researchers. The study of the pozzolanic activity of mineral additions has not been the exception In this sense, one of the proposed methods to this effect has been based on electrical conductivity measurements in aqueous suspensions of pozzolan: calcium hydroxide [1,2,3,4,5,6,7,8,9,10]. Lanzón et al [11] studied the influence of lightweight aggregates in mortar performance These aggregates showed a slight pozzolanic activity, which was studied, on the one hand in aqueous suspensions of calcium hydroxide, and on the other hand in aqueous suspensions of Portland cement.
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