Abstract
The paper describes the effect of carbon fibre on alkaliactivated slag mortar (AAS) mechanical strength, volume stability and reinforcing steel corrosion, compared to its effect on the same properties in Portland cement (PC) properties. Mechanical strength and volume stability tests were performed as set out in the respective Spanish UNE standards. The corrosion rate of steel embedded in the specimens studied was determined from polarization resistance analysis. One of the findings of the study performed was that carbon fibre failed to improve AAS or CP mortar strength. As far as volume stability is concerned, the inclusion of carbon fibres in AAS with a liquid/solid ratio of 0.5 reduced drying shrinkage by about 50%. The effect of carbon fibre on PC mortars differed from its effect on AAS mortars. Studies showed that in the presence of carbonation, steel corrosion reached higher levels in carbon-fibre reinforced AAS mortars; the inclusion of 1% carbon fibre improved corrosion resistance perceptibly in these same mortars, however, when exposed to chloride attack.
Highlights
In recent decades, the need to meet the requirements laid down in the Kyoto Protocol and other environmental and energy legislation has made the study and development of alternatives to Portland cement a priority line of research and an issue of intense scientific and technological interest world-wide
Mechanical strength was observed to decline as the percentage of CFP rose
For mortars made with 1% CFP, strength was found to slide by 3%, while that decrease was 6 and 10%, respectively, for mortars made with 3 and 5% CFP
Summary
The paper describes the effect of carbon fibre on alkaliactivated slag mortar (AAS) mechanical strength, volume stability and reinforcing steel corrosion, compared to its effect on the same properties in Portland cement (PC) properties. One of the findings of the study performed was that carbon fibre failed to improve AAS or CP mortar strength. As far as volume stability is concerned, the inclusion of carbon fibres in AAS with a liquid/solid ratio of 0.5 reduced drying shrinkage by about 50%. Studies showed that in the presence of carbonation, steel corrosion reached higher levels in carbon-fibre reinforced AAS mortars; the inclusion of 1% carbon fibre improved corrosion resistance perceptibly in these same mortars, when exposed to chloride attack. (**) Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Madrid (Madrid, España) (*) Universidad de Alicante (Alicante, España). (**) Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Madrid (Madrid, España)
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