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Effects of inert and low active mineral admixtures on strength and microstructure of cement-based materials

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Document pages: 9 pages

Abstract: By comparing the strength and microstructure of cement paste and mortar containing limestone powder or inferior fly ash, cement-based materials were studied. The compressive strength of mortar at 28 and 90 ℃ was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis and differential thermal analysis (TG-DTA). The results show that the strength of mortar decreases with the increase of mineral admixture. Limestone powder is mainly used as inert filler and hardly participates in chemical reaction. Low quality fly ash may accelerate the formation of hydration products in samples containing more chemically bound water. This further leads to higher hydration degree and denser microstructure of cement,while the overall heat of hydration was reduced. At the early stage of hydration, low quality fly ash can be considered as an inert material whereas its reactivity at the later stage became high, especially for ground low quality fly ash.

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