Recycling of sludge ash of wastewater treatment plants in cementitious materials; effect of rheo-mechanical characteristics

D. Djafari, B. Safi, R. Zentar


Abstract: The present study is a contribution to the valorization of even the elimination of sludge storage in wastewater treatment plants (WWTPs). Indeed, after the calcination of sludge, ash obtained is incorporated into cement, for the production of ecological cements,
or eco-cements.

This approach constitutes a durable solution and unquestionable safeguarding of our ecosystem of any nuisance which can endanger
the balance of our environment. The eco-cement is developed by substitution of different amount of ash (5%, 10% and 15%) obtained into the clinker. The workability of different cement paste of eco-cements developed can be characterized by the evaluation of yield shear stress
 by using mini slump cone. Mortar samples were tested to observe the evolution of the mechanical compressive strength was according to time (for 2, 7 and 28 days). The results obtained showed a remarkable increase in yield shear stress of cement paste and an improvement in the strength of mortar in the cured state.

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