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DYNA

versão impressa ISSN 0012-7353

Resumo

TOBON, JORGE IVÁN  e  KAZES GOMEZ, REBECA. BEHAVIOR OF PORTLAND CEMENT BLENDED WITH LIMESTONES OF DIFFERENT PURITY DEGREES. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.156, pp.177-184. ISSN 0012-7353.

In this article the behaviour of Portland cement blended with calcareous rocks with different qualities was evaluated. We added 15, 20 and 25% of carbonate rocks with holding (% of CaCO3) <70% (low-limestones), 70 - 80% and >80% (high-limestones). Strength of the mortars to 3, 7 and 28 days was tested. The mineralogical evolution in pastes during the hydrate process was determined using X-Rays Diffraction and thermogravimetric Analysis. It is found that the low-limestone are a goodness option for blended cements still above of 20% because they had less negative effects on the strength in comparison with the high-limestone. The low-limestone did not change the setting time, expansion or water demands to blended mortars. The blended mortars with 20% of low-limestone had an IP>75% (ASTM C311), however, these low-limestones did not show pozzolanic activity because they did not produce the waiting mineralogical changes.

Palavras-chave : blended cement; addition minerals; limestone; Strength and pozzolans.

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