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Effect of flaky Plastic Particle Size and Volume Used as Partial Replacement of Gravel on Compressive Strength and Density of Concrete Mix

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Journal of Environmental Protection 2019年第6期10卷 711-721页

作者： Stanley O. Osubor Kamoru A. Salam Taiwo M. Audu Department of Chemical Engineering Faculty of Engineering University of Abuja Abuja Nigeria Department of Civil Engineering Faculty of Engineering University of Abuja Abuja Nigeria

Common ways of disposing waste plastic such as incineration and landfilling have negative impacts on the environment. Partial replacement of natural aggregate in concrete with waste plastic including polyethylene terephthalate (PET) is more environmental friendly and sustainable. The effect of adding 5% to 20% waste plastic by volume of natural coarse aggregate (“gravel”) and plastic particle size (3 to 7 mm) on the density and compressive strength of plastic-concrete mix after 28 days of curing was studied. The results showed that density of the concrete decreased from 2406.7 to 2286.7 kg/m3 as waste plastic increased from 5% to 20% v/v compared with 2443.3 kg/m3 recorded by concrete without waste plastic. Change in particle size from 3 to 7 mm has no significant effect on the density of the plastic-concrete mix. The compressive strength decreased as the volume and particle size of waste plastic increased. When waste plastic volume changed from 5% to 20% v/v, the compressive strength decreased from 20.5 to 15 MPa, 18.6 to 14.3 MPa and 17.2 to 13.8 MPa for 3, 5 and 7 mm waste plastic particle size respectively while the concrete without plastic has 21.33 MPa. Therefore, the addition of 5% (v/v gravel) of flaky waste plastic in the concrete produces a lightweight concrete which could offer economic benefit without substantially reducing the compressive strength of the plastic-concrete mix.

关键词： flaky Plastic Compressive Strength Density Gravel Particle Size Plastic-Concrete Mix

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Facile synthesis of flake-like dihydrate zinc oxalate particles

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 234-240页

作者： Xing Chen Xin Liu Kai Huang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Global Energy Research Institute Future Science and Technology Park Beijing Key Lab of Green Recycling and Extraction of Metals University of Science and Technology Beijing

Monodispersed dihydrated zinc oxalate(ZnC_2O_4·2H_2O) particles with characteristic morphology were synthesized by aging a mixed solution of zinc nitrate(Zn(NO_3)_2) and sodium oxalate(Na_2C_2O_4) in the presence of a citrate ligand, with an average flat size of approximately 10–15 μm. The important parameters, including the solution pH values and the concentration of the zinc ions and citrate ligand, were investigated using a series of experiments. It is verified that the citrate ligand significantly affects the morphology of zinc oxalate particles, probably via its multiple roles of chelating, dispersing, and selective absorption. Thermodynamic equilibrium of the distribution of zinc species in an aqueous solution of Zn(Ⅱ)-citrate-oxalate-H_2O was estimated to explain the experimental results and to clarify the size and morphological evolution mechanism of the precipitated particles.

关键词： facile synthesis zinc oxalate flaky morphology citrate ligand one-pot synthesis

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