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Effect of Limestone Powder Addition Quality on SCC Rheology
Abstract Limestone powder is increasingly used as a supplementary cementitious composites in order to reduce the environmental impact of concrete. Limestone powder can simultaneously improve the rheological behaviour of the paste, increases the solid volume fraction and reduces the shrinkage of the concrete. The quality of limestone fillers is quarry-dependent and varies with the mineralogy of the original limestone rock. The filler produced can thus contain small but significant amount of different kinds of impurities. In this study, the change in SCC rheology (yield stress value) induced by the variation in quality of the limestone filler (coming from the same quarry) is analysed. In a first part, mineralogical analyses are performed in order to identify the nature of chemical species present in the limestone filler in addition to calcite. Then, the effect of calcite content in the limestone filler on the yield stress of limestone suspension is investigated using conventional rheometry. The results highlight the presence of a critical content of impurities above which the yield stress of the limestone filler shows a dramatic increase. This high value of the yield stress implies a complete redefinition of the SCC mix-design. Finally, a simple rheological test, based on cone penetration test, is proposed in order to quickly evaluate the quality of the filler before its introduction into the production process. This test can be used as a quality control procedure in order to define whether there is a need to change the mix design of SCC.
Effect of Limestone Powder Addition Quality on SCC Rheology
Abstract Limestone powder is increasingly used as a supplementary cementitious composites in order to reduce the environmental impact of concrete. Limestone powder can simultaneously improve the rheological behaviour of the paste, increases the solid volume fraction and reduces the shrinkage of the concrete. The quality of limestone fillers is quarry-dependent and varies with the mineralogy of the original limestone rock. The filler produced can thus contain small but significant amount of different kinds of impurities. In this study, the change in SCC rheology (yield stress value) induced by the variation in quality of the limestone filler (coming from the same quarry) is analysed. In a first part, mineralogical analyses are performed in order to identify the nature of chemical species present in the limestone filler in addition to calcite. Then, the effect of calcite content in the limestone filler on the yield stress of limestone suspension is investigated using conventional rheometry. The results highlight the presence of a critical content of impurities above which the yield stress of the limestone filler shows a dramatic increase. This high value of the yield stress implies a complete redefinition of the SCC mix-design. Finally, a simple rheological test, based on cone penetration test, is proposed in order to quickly evaluate the quality of the filler before its introduction into the production process. This test can be used as a quality control procedure in order to define whether there is a need to change the mix design of SCC.
Effect of Limestone Powder Addition Quality on SCC Rheology
Rangeard, Damien (author) / Perrot, Arnaud (author) / Rodomond, Malalasoa (author)
2019-08-25
8 pages
Article/Chapter (Book)
Electronic Resource
English
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