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

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, 27 Al and 29 Si { 1 H} 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 Al 3+ 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.