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Wang H.-J.,Shenyang University of Technology | Wang H.-H.,Shenyang University of Technology | Wei H.,Shenyang University of Technology | Gu C.-Y.,Investigation and Design Institute of Water Resources and Hydropower of Liaoning Province
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2015

Aiming at the frost resistance of hydraulic concrete in severe cold region, the frost resistance of hydraulic concrete under the freezing and thawing temperature ranging from (8±2) ℃ to (-17±2) ℃ and from (8±2) ℃ to (-22±2) ℃ was studied. Through measuring such evaluation criteria of frost resistance of concrete as the mass loss, dynamic elastic modulus and flexural strength of specimens, the frost resistance of hydraulic concrete in severe cold region was evaluated. The experimental results show that when the water-cement ratio of hydraulic concrete is 0.5 and the air content is 5%, the frost resistance label is F300, which can meet the design requirement. But for the concrete with the same mixture ratio, the frost resistance label in severe cold region is F200, which can not meet the design requirement. In severe cold region, the lowest freezing temperature of concrete has significant effect on the frost resistance of concrete, especially the mass and dynamic elastic modulus. ©, 2015, Shenyang University of Technology. All right reserved. Source


Tang Y.,Shenyang Jianzhu University | He J.,Shenyang Jianzhu University | Wu W.,Shenyang Jianzhu University | Fu J.,Shenyang Jianzhu University | Zhao H.,Investigation and Design Institute of Water Resources and Hydropower of Liaoning Province
Huagong Xuebao/CIESC Journal | Year: 2011

Study on simultaneous biological removal of iron, manganese and ammonia in a simulated groundwater involving iron and manganese and pollutant ammonia-nitrogen was carried out in biological aerated filter with dual layer ceramic material. The influence of the flow rate on the removal of iron, manganese and ammonia and the change of their concentrations along the depth of the filter were measured. The results show that if flow rates increase suddenly only after 2-3 d culture for the filter, the concentrations of iron, manganese and ammonia at exit of the filter can be lower than that of the National Drinking Water Standard. It is found that when flow rates of the simulated contaminated groundwater increase from 0.74 m·h-1 to 3.0 m·h-1, the filter depth to meet the National Drinking Water Standard is only 0.75 m for concentrations of iron and ammonia in water, but it increases from 0.75 m to 1.60 m for the concentration of manganese. © All Rights Reserved. Source

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