Abstract
Large amounts of silt have been deposited on the seabed in China’s coastal areas due to intensive coastal development and marine raft aquaculture, which are the main causes of local marine environmental disasters. In this study, seabed silt was tested as a potential raw material for artificial reefs. The silt was mixed with cement in four proportions to create concrete specimens for use in silt artificial reefs (SARs). The compressive strength development and nutrient dissolution were examined in the SAR specimens. The hydration products of the SAR paste were investigated through X-ray diffraction (XRD), scanning election microscope (SEM), and differential scanning calorimetry (DSC) techniques. The results showed that the compression strength of the SAR specimens was inversely proportional to their seabed silt content. The SAR specimens were able to continuously dissolve nitrogen-containing nutrients. The presence of Ca(OH)2, commonly found in traditional concrete, was not detected, which may help improve the seaweed adhesion and biological effects of artificial reefs. The effective utilization of seabed silt could serve to restore and improve the marine ecological environment.
Highlights
An artificial algal reef (AAR), a type of artificial reef, is an underwater structure created to improve the environment for seaweed growth and increase the protection of fishery resources [1,2,3].The many types of artificial reef material have different adhesive properties and biological effects [4,5].In general, concrete is the most common material for AARs due to its stable structure, availability, and ease of modeling
The compressive strength of the specimens showed an upward trend over the duration of the curing time, which conforms to the strength-change laws of concrete
In this study, seabed silt was tested as a potential raw material for artificial reefs
Summary
An artificial algal reef (AAR), a type of artificial reef, is an underwater structure created to improve the environment for seaweed growth and increase the protection of fishery resources [1,2,3].The many types of artificial reef material have different adhesive properties and biological effects [4,5].In general, concrete is the most common material for AARs due to its stable structure, availability, and ease of modeling. An artificial algal reef (AAR), a type of artificial reef, is an underwater structure created to improve the environment for seaweed growth and increase the protection of fishery resources [1,2,3]. The many types of artificial reef material have different adhesive properties and biological effects [4,5]. Artificial reefs made of concrete can provide a substrate for seaweed attachment, which provides a habitat for the accumulation and growth of fish and food and shelter for invertebrates and crustaceans [6,7,8,9]. The production of artificial reefs based on AAR concepts and technologies can save a lot of raw material and effectively consume waste, protecting land resources and the environment while avoiding the pollution caused by man-made waste disposal
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