Hydration and Strength of Cement Pastes Containing Different Nanoparticles

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2019
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Wang, Kejin
Wang, Kejin
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American Concrete Institute
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Wang, Kejin
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Civil, Construction and Environmental Engineering
Abstract
In this work, effects of nanosilica (NS), nanolimestone (NL), and nanoclay (NC) additions on hydration and strength of cement pastes were studied. The pastes were made with Type I ordinary Portland cement (OPC), 0 and 30% Class F fly ash (FA), and 0 or 1% nanomaterials. All pastes had a water-to-binder ratio of 0.5. Chemical shrinkage was monitored as an indication of cement hydration process. X-ray diffraction (XRD) was conducted to identify crystalline hydration products. Thermogravimetric analysis (TOA) was used to quantify calcium hydroxide (CH) and chemically bound water. The results indicate that the rate of chemical shrinkage curve can be divided into five stages, similar to that observed from the rate of cement hydration curve measured from a calorimetry test. All nanomaterials increased the rate of chemical shrinkage associated with C3S and C2S reactions; but different types of nanomaterials had different effects on the rate of chemical shrinkage associated with secondary C3A reaction. All nanomaterials improved strength of OPC paste at ages up to 28 days; but the improvement was not clear for OPCFA pastes. Through reaction with OPC and FA, NL stabilized voluminous ettringite and produced hemicarbonate (Hc) instead of less voluminous monosulfate (Ms).
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This chapter is published as Wang, Xin and Kejin Wang. " Hydration and Strength of Cement Pastes Containing Different Nanoparticles." In Nanotechnology for Improved Concrete Performance (Mahmoud Reda Taha and Mohamed T. Bassuoni, eds.) SP-337. American Concrete Institute (2019): 83-96. Copyright 2019 American Concrete Institute. Posted with permission.
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nanomaterials, fly ash, cement, hydration, chemical shrinkage, compressive strength
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