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Effect of Silica Fume on Compressive Strength of Oil-Polluted Concrete in Different Marine environments

China Ocean Engineering 2017年第6期31卷 716-723页

作者： Hamid SHAHRABADI Sina SAYAREH Hamed SARKARDEH Department of Civil Engineering Chabahar Maritime UniversityChabaharIran Department of Civil Engineering University of Sistan&BaluchestanZahedanIran Department of Civil Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevarIran

In the present research, effect of silica fume as an additive and oil polluted sands as aggregates on compressive strength of concrete were investigated experimentally. The amount ofoil in the designed mixtures was assumed to be constant and equal to 2% of the sand weight. Silica fume accounting for 10%, 15% and 20% of the weight is added to the designed mixture. After preparation and curing, concrete specimens were placed into the three different conditions： fresh, brackish and saltwater environments （submerged in fresh water, alternation of exposed in air ＆ submerged in sea water and submerged in sea water）. The result of compressive strength tests shows that the compressive strength of the specimens consisting of silica fume increases significantly in comparison with the control specimens in all three environments. The compressive strength of the concrete with 15% silica fume content was about 30% to 50% higher than that of control specimens in all tested environments under the condition of using polluted aggregates in the designed mixture.

关键词： compressive strength water environments oil polluted sands silica fume marine concrete structures

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Navigating Eutrophication in Aquatic environments: Understanding Impacts and Unveiling Solutions for Effective Wastewater Management

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Research in Ecology 2023年第3期5卷 11-18页

作者： Arnob Dhar Pranta Md.Tareque Rahaman Md.Samin Ahmed Md.Shamsul Arefin Rafi Department of Textile Engineering Mawlana Bhashani Science and Technology UniversitySantoshTangail1902Bangladesh Department of Computing Liverpool John Moores UniversityLiverpoolL35UXUnited Kingdom Department of Chemistry Mawlana Bhashani Science and Technology UniversitySantoshTangail1902Bangladesh

Eutrophication is the term used to describe the presence of natural and artificial nutrients like phosphorus and nitrogen in aquatic *** water quality in various bodies of water such as ponds,lakes,rivers,*** deteriorating as a result of an abundance of plant nutrients in these water ***-enrichment of aquatic ecosystems with nutrients is a major hazard to the well-being of aquatic ecosystems *** addition,the circulations have lowered the requirements for home and agricultural consumption of *** main origins of these plant nutrients within aquatic ecosystems stem from the discharges of industries engaged in activities like livestock farming,agriculture,fertilizer production,manufacturing of textiles,and clothing ***,a variety of methods and approaches have already been developed as safety measures to avoid the negative consequences of water tainted with those undesired *** presents many obstacles,but with the right public awareness campaign and global scientific efforts,its negative impacts may be *** research seeks to pinpoint the primary origins of plant nutrients within the aquatic ecosystem and explore potential triggers for ***,it proposes innovative regulatory methods and offers suggestions for sustainable wastewater management practices.

关键词： Eutrophication Phosphorus water environments Fertilizers Wastewater

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