Prototype observation of the concrete dam is an important and effective measure to master the operating condition of dams. Analysis of changes of concrete temperature for dams is the basis of studying the safety of dam operation. By analyzing the raw monitoring data of temperature of a RCC dam, this paper researches the changing process of concrete temperature and internal concrete partitions temperature variation of dams. It also draws the temperature field of the dam concrete. The results show that the isothermals of downstream side parallel with the surface of the downstream dam, and the isothermals of upstream side intersect with the dam. Isothermals which are near to the dam’s surface are close. This suggests that temperature gradient there is large. There is a high temperature nucleus and two low temperature nucleuses in the temperature field of the dam in summer, while in winter there is only one high temperature nucleus. So it suggests that the temperature field in summer is more complex.
The sintering behavior, physical properties and heat processing changes of bauxite-based homogenized grogs prepared by homogenization process and high temperature sintering using bauxite as starting material were investigated. Results show that the bauxite-based mullite can be synthesized by the method, sintering temperature with and without MgO/CeO2sintering aids are 1600°C and 1700°C separately, the mullite with apparent porosity of<1.0% and 2.5%, bulk density of ≥2.87g•cm-3and 2.75g•cm-3, Refracteriness-Under-Load(RUL) 1600°C and 1620С; changes in the heat processing is divided into three stages: dehydration stage(400°С~900°С ), primary mullitization stage(1000°С ~1200°С) and secondary mullitization stage(>1200°С).
Traditional concrete revetment technology mainly focuses on the safety of engineering without taking the river ecological system protection into account. The ecological concrete revetment can properly combines the river slope sclerosis with green to keep the river ecological system sustainable develop. Ecological concrete revetment includes excavating, laying concrete frame, pouring ecological concrete, filling nutrition soil, planting vegetation, management and observation processes. The revetment of concrete hexagonal tile is suitable with excellent resistance to water washing out and good capability of fixing soil. Slop protection of concrete rectangular frame is used for its large scale and high efficiency of construction. Selecting native plants for greening materials is convenient of transplanting, it has low cost and high survival rate.
This paper suggests that deposition paste area is one of those leading control indicators of mix proportion design for the macroporous ecological concrete without sand. By analyzing the effect of water-cement ratio, amount of cement, and type of coarse aggregates on application properties of concrete, it puts forward that when carrying out the mix proportion design of the concrete, setting the water-cement ratio as 0.4 can help the macroporous ecological concrete without sand acquire satisfying application properties. Based on this idea, experiments to the later period strengths and the erosion resistance property of concretes are tried out. Finally, the result of this series of experiments shows that the macroporous ecological concrete without sand possesses necessary conditions for plants to survive and grow up.
The back analysis principle and method for thermal conductivity of RCC is introduced in this paper, and a Jiang Ya RCC dam is cited as a building example , on the basis of prototype temperature data of dam, the mathematic model by Difference principle is founded, the thermal conductivity of RCC is obtained. The result is similar to the data which is received in the laboratory. The back analysis is proved credible. The back analysis for thermal conductivity, on the one hand, actual safety of the completed projects could be evaluated; on the other hand, the design and construction in progress may be optimized. the scientific foundation for optimizing the design and monitoring the running of dam is provided. And it is provided with some scientific value and practical significance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.