Evaluation
of pozzolanic activity and physicomechanical characteristics in metakaolin-lime
pastes |
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| Authors: | A Bakolas E Aggelakopoulou A Moropoulou S Anagnostopoulou |
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| Institution: | (1) School of Chemical Engineering, Section of Materials Science and Engineering, National Technical University of Athens, Zografou, Athens, Greece, 15773, 9 Iroon Polytechniou St. |
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| Abstract: | In order
to evaluate the pozzolanic activity of metakaolin, several pastes were prepared,
by mixing metakaolin with hydrated lime, in different ratios. The pastes were
stored in standard conditions (RH=99±1%, T=25±1°C) and evaluated using thermal
analysis (DTA/TG), X-ray diffraction (XRD), compressive strength tests and
mercury intrusion porosimetry (MIP), in time. The obtained results revealed
that the compounds formed are CSH, C2ASH8
and C4
11
while C4AH13 was not detected
up to 270 days of curing. The calcium hydroxide consumption increases as the
initial amount of the metakaolin in the paste augments. The maximum strength
development is obtained for metakaolin/lime ratio:1. |
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| Keywords: | hydration phases lime metakaolin pozzolanic activity thermal analysis |
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