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Influence of Activated Art Paper Sludge-Lime Ratio on Hydration Kinetics and Mechanical Behavior in Mixtures Cured at 20°C

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This research study shows for the first time the hydration reaction of Activated Art Paper Sludge (AAPS)-lime mixtures cured at 20°C. Two mixtures series were prepared using weight ratios of 3:1 and 1:1 for AAPS/lime. The kinetics of the hydration reaction was investigated by characterization techniques such as X-ray diffraction, thermo-gravimetrical and differential thermal analysis, 27Al and 29Si {1H} magic angle spinning nuclear magnetic resonance. Results show higher quantity of hydrated phases formed with the increase of the AAPS/lime ratio (such as calcium silicates hydrates (C–S–H), hydrated tetracalcium monocarboaluminate , and hydrotalcite-like phases), specially C–S–H exhibiting a major incorporation of Al3+ into silicate chains, increasing its medium chain length. It becomes demonstrated that mechanical performance of the studied mixtures will be directly influenced by all these parameters.
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Document Type: Research Article

Affiliations: 1: Instituto Eduardo Torroja, CSIC, C/Serrano Galvache 4, 28033 Madrid, Spain 2: Instituto de Tecnología Química, UPV-CSIC, Avenue de los Naranjos s/n, 46022 Valencia, Spain

Publication date: 01 December 2009

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