Utilization of sediments dredged from marine ports as a principal component of composite material

• Published in: Journal of cleaner production Vol. 142; pp. 4041 - 4049
• Main Authors: Mymrin, Vsevolod, Stella, Jacqueline C., Scremim, Cristofer B., Pan, Roberto C.Y., Sanches, Filipe G., Alekseev, Kirill, Pedroso, Daniela E., Molinetti, Andrea, Fortini, Otavio M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20-01-2017
• Subjects: Atlantic ocean pollution; Cement-less solid materials; Dredging sediment utilization; Mechanical properties; Ocean environment protection; Structure formation processes; Ocean environment protection; Mechanical properties; Atlantic ocean pollution; Cement-less solid materials; Dredging sediment utilization; Structure formation processes
• DOI: 10.1016/j.jclepro.2016.10.035
• EISSN: 1879-1786
• ISSN: 0959-6526

The main purpose of this research is to develop technically, economically, and environmentally attractive construction materials from sediments dredged from Brazilian seaports. The final composite material contains 50 to 60 wt% in mass of sediments and thus creates an opportunity to diminish the pollution of the Atlantic Ocean. Construction and demolition debris (20–35%) and lime production wastes (15–30%) were used as components of the composite materials. Uniaxial compressive strength values reach 6.3 MPa on the 3rd day and 14.5 MPa on the 90th day; linear shrinkage varied between 0.07% and 0.35%, water absorption - between 11.0 and 13.4%. These values attend the demands of Brazilian norms on conventional bricks, blocks, etc. XRD, XRF, SEM, EDS, AAS and LAMMA analysis showed that amorphous new formations are responsible for material strengthening.
•Stopping of world oceans environment clogging by contaminated ports dredged sludge.•Construction materials containing 50–60% sludge of sea ports were developed.•Uniaxial compressive strength of the materials on the 90th day of curing reached 14.5 MPa.•The value of linear expansion is 0.35% and water absorption is 13.4% after 90 days.•The materials have new structural formations from mainly amorphous CSH-type and carbonates.