Reuse of Lake Sediments in Sustainable Mortar
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Published:2023-08-22
Issue:9
Volume:10
Page:149
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ISSN:2076-3298
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Container-title:Environments
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language:en
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Short-container-title:Environments
Author:
Martellotta Audrey Maria Noemi12ORCID, Petrella Andrea1, Gentile Francesco2ORCID, Levacher Daniel3ORCID, Piccinni Alberto Ferruccio1ORCID
Affiliation:
1. Department of Civil, Environmental, Land, Building Engineering and Chemistry, Polytechnic University of Bari, Via E. Orabona 4, 70125 Bari, Italy 2. Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Via Amendola 165/A, 70126 Bari, Italy 3. UMR 6143 CNRS—Continental and Coastal Morphodynamics, University of Caen Normandy, 24 rue des Tilleuls, 14000 Caen, France
Abstract
The study analyses the possible valorisation of lake sediments for sustainable mortar, in accordance with the principles of the circular economy, to obtain a sustainable material, since reuse occurs without any kind of preliminary treatment and preserves the consumption of virgin raw materials in the mix design. Moreover, it reduces the amount of water to be used in the mix since part of it is already contained in the sediments. The research was performed on sediments dredged from two artificial reservoirs, Camastra and San Giuliano, located in Basilicata, a region in southern Italy. Cement mortar was prepared by completely replacing, at different quantities, the fine aggregate and, for some of it, partially replacing, at a constant quantity, part of the binder. Workability, mechanical strength, and density were measured, as well as the possible release of contaminants. The investigations made it possible to assess the influence of replacing aggregate with sediment on mortar performance, showing that San Giuliano sediment produces mortar with great workability (~140%), comparable to that of normalised mortar. Similarly, the mechanical strengths of some specimens (SG_s1 and SG_s2) were approximately 60 MPa and 52 MPa, respectively (about 15% higher than that of normalised mortar). On the contrary, for the mortar prepared with the Camastra sediments, both workability and mechanical strength were ~50% lower than normalised mortar. Furthermore, the leaching test did not reveal contaminant release.
Subject
General Environmental Science,Renewable Energy, Sustainability and the Environment,Ecology, Evolution, Behavior and Systematics
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