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Zhang Y.-C.,Chinese Research Institute of Highway | Gao L.-L.,Shanxi Conservancy Technical College
Applied Mechanics and Materials | Year: 2013

A number of rubber cement dosage specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement mortar by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement mortar almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%. © (2013) Trans Tech Publications, Switzerland. Source


Zhang Y.-C.,Chinese Research Institute of Highway | Liu S.-W.,Chinese Research Institute of Highway | Gao L.-L.,Shanxi Conservancy Technical College
Advanced Materials Research | Year: 2014

A number of rubber cement concrete specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement concrete by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement concrete almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%. © (2014) Trans Tech Publications, Switzerland. Source


Zhang Y.-C.,Key Laboratory of Highway Construction and Maintenance Technology in Loess Region | Zhang Y.-C.,Chinese Research Institute of Highway | Gao L.-L.,Shanxi Conservancy Technical College
Green Building, Materials and Civil Engineering - Proceedings of the 4th International Conference on GreenBuilding, Materials and Civil Engineering, GBMCE 2014 | Year: 2015

The reason of sulfate attack of concrete was analyzed from Aft damage, CaS04·2H2O damage, Mg2+ damage and thaumasite damage. Then the effect of performance of concrete itself, corrosion solution, the environment and working conditions on sulfate corrosion of concrete was determined. © 2015 Taylor & Francis Group, London. Source


Zhang Y.-C.,Chinese Research Institute of Highway | Zhang Y.-C.,Changsha University of Science and Technology | Gao L.-L.,Shanxi Conservancy Technical College
International Journal of Pavement Research and Technology | Year: 2016

A double-layer structure model of pavements that considered interlayer contact status was established to manage the dowel-bar position deviation problem in rigid pavements. The deviation effect of three-dimensional positions, such as horizontal angle, vertical angle, and embedded depth, on joint load-transfer capacity was analyzed. A load-transfer capacity prediction model that considered dowel bar position deviation was established via ternary nonlinear regression. Load correction factor and its range were also proposed. This prediction model can effectively reflect the joint load-transfer capacity during dowel position deviation after verification via falling weight deflectometer testing. The horizontal angle of the dowel bar minimally affected joint load-transfer coefficient. By contrast, the joint load-transfer coefficient decreased almost linearly as the vertical angle increased. The coefficient reduced by approximately 12% when the vertical angle was 15°. Meanwhile, the load-transfer coefficient was maximized when a dowel bar was embedded in the middle of a surface. The coefficient would decline either upward or downward. The coefficient particularly decreased by 10% when the position was 2 cm downward. © 2016 Chinese Society of Pavement Engineering. Source


Yang R.,Shijiazhuang Mechanical Engineering College | Kang J.,Shijiazhuang Mechanical Engineering College | Quan Z.,Shanxi Conservancy Technical College
Science and Technology of Nuclear Installations | Year: 2015

Nuclear power plants are highly complex systems and the issues related to their safety are of primary importance. Probabilistic safety assessment is regarded as the most widespread methodology for studying the safety of nuclear power plants. As maintenance is one of the most important factors for affecting the reliability and safety, an enhanced preventive maintenance optimization model based on a three-stage failure process is proposed. Preventive maintenance is still a dominant maintenance policy due to its easy implementation. In order to correspond to the three-color scheme commonly used in practice, the lifetime of system before failure is divided into three stages, namely, normal, minor defective, and severe defective stages. When the minor defective stage is identified, two measures are considered for comparison: one is that halving the inspection interval only when the minor defective stage is identified at the first time; the other one is that if only identifying the minor defective stage, the subsequent inspection interval is halved. Maintenance is implemented immediately once the severe defective stage is identified. Minimizing the expected cost per unit time is our objective function to optimize the inspection interval. Finally, a numerical example is presented to illustrate the effectiveness of the proposed models. © 2015 Ruifeng Yang et al. Source

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