Abstract
This work deals with the use of dredged marine sand (DMS) in pastes and mortars as construction material. Different materials from two Spanish ports were used: DMS-0 from Sant Carles de la Rapita and DMS-A, DMS-B and DMS-C from Barcelona. The aim of the study was to assess DMS as addition (its influence on cohesion and fluidity) or as a fine granular corrector (its influence on compressive strength) in different mixes of cement paste and mortars, respectively. Two experimental stages were carried out: firstly, DMS-0 material was used on the production of pastes and mortars (partial substitution of raw sand 0/2 mm); secondly, DMS-A, DMS-B and DMS-C were used on mortar production (partial substitution of raw sand 0/5 mm). The fresh and hardened properties obtained were compared to those of the control mixes; the results revealed 25 % as an optimum substitution ratio of raw sands for DMS.
Highlights
Population growth and infrastructure development in coastal areas have led to a rise in land reclamation
In order to obtain the normal consistency on pastes PN1, PN2 and PN3, the water-cement ratio was increased from 0.24 to 0.27 in PN2, and to 0.36 in PN3
The dredged marine sand (DMS)-0 used in this study presents mineral characteristics more similar to sands than to fillers, the incorporation of 25% of DMS-0 meant some improvement in the cohesion of the mixes, and no segregation was observed
Summary
Population growth and infrastructure development in coastal areas have led to a rise in land reclamation. From the economic and environmental point of view, the use of dredged material as a new source for construction materials offers considerable advantages. It could solve the shortage of aggregates as well as environmental constraints concerning the opening of new quarries or the continuously increasing demand for aggregates in civil construction. Alternative solutions to the management of marine sediments after dredging are increasingly required. The new European Union directives (2-7) with regard to sustainable marine development have encouraged harbor managers to reconsider traditional solutions such as immersion disposal in landfills of by-products or dumping at sea
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