Caracterización de morteros de cemento portland substituido por metacaolín de baja pureza
Abstract
A series of mortars were prepared with an aggregate:binder ratio of 2.75:1 using silica sand and a water/binder ratio of 0.45. Two kaolin minerals (Mk, red and white) with high quartz contents were ball milled to a fineness lower than that of ordinary portland cement (OPC). Both minerals where calcined at 550 to 1050°C to evaluate the effect of temperature on the strength development of mortars with a substitution of 20% of the OPC. After a first set of tests, only the white Mk, with a purity of 50%, fired at 750°C was used to continue investigating the effect of the level of substitution of OPC at 0, 10, 20, 30, 40 y 50%. The the compressive strength was monitored for up to 90 days. The use of 10-30% of Mk was the most favorable. Mortars of 100% OPC reached 8 and 38 MPa after 1 and 90 days, respectively, while those with substitution of 10-30% of the OPC showed enhanced strength of 10 and 52 MPa at the same ages. On the other hand, the substitution of 40 and 50% of the OPC resulted in low 1 day strengths of 1-3 MPa; nonetheless, the strengh increased rapidly and after 90 days reached 49 and 40MPa for 40 y 50% MC, respectively. The white Mk showed a strong pozzolanic activity in spite of its low purity, as noted by the consumption of the calcium hydroxide measured by thermal analysis and scanning electronic microscopy. The latter technique showed that after 90 days, the microstructures of all mortars where dense in agreement with the strength registered
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