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2014 ; 7
(11
): 7533-7547
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Assessment of Pozzolanic Activity Using Methods Based on the Measurement of
Electrical Conductivity of Suspensions of Portland Cement and Pozzolan
#MMPMID28788261
Velázquez S
; Monzó JM
; Borrachero MV
; Payá J
Materials (Basel)
2014[Nov]; 7
(11
): 7533-7547
PMID28788261
show ga
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.