Investigation of Mechanical Properties and Hydration Behavior in Cement Mortars Partially Substituted with Water Treatment Sludges

Authors

Leila Djekoune
University of Sciences and Technology Houari Boumediene, POBox 32 El-Alia-Bab-Ezzouar, 16 111 Algiers, Algeria. Laboratory of Industrial Process Engineering Sciences (LSGPI) Faculty of Mechanical and Process Engineering, Algeria
Aziz Maaliou
University of Science and Technology Houari Boumediene, Faculty of Civil Engineering, LEGHYD Laboratory POBox 32; 16111, El-Alia-Bab-Ezzouar , Algeria
Dalila Ziani
University of Science and Technology Houari Boumediene, Faculty of Civil Engineering, LEGHYD Laboratory POBox 32; 16111, El-Alia-Bab-Ezzouar , Algeria
Abderzak Moussouni
University Center of Mila, POBox N°26 RP Mila 43000, Algeria

Synopsis

This study delves into the mechanical behavior and hydration characteristics of cement mortars incorporating varying percentages (5-25%) of water treatment sludges. The research explores the evolution of compressive strength over curing periods, revealing a notable increase in mechanical strength for all sludge content levels. This phenomenon affirms the pozzolanic activity of the partially replaced cement mortars with sludges from water treatment units. Notably, mortars with 5% sludge exhibit compressive strength values comparable to reference mortars. Conversely, an investigation into the influence of sludge addition indicates a proportionate reduction in mechanical strength, with a significant impact observed at higher sludge percentages (15-25%). The study further identifies a deceleration in hydration rates due to the presence of organic matter in the sludges, hindering cement hydration and extending the mortar setting time. Overall, this research sheds light on the nuanced effects of water treatment sludge incorporation in cement mortars, offering valuable insights for sustainable and effective waste utilization in construction materials.

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Published
December 9, 2024