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Research on Pavement Performance of Fly-ash-residue Concrete

Author: ChenYun
Tutor: LiuDaChao
School: Chongqing Jiaotong University
Course: Materials Science
Keywords: fly-ash-residue improving activing pavement concrete pavement performance
CLC: U414
Type: Master's thesis
Year: 2010
Downloads: 80
Quote: 2
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Abstract


Currently, in China, fly ash emitted from coal-fired power plants and low-heat value power plants is mroe than 30 million tons, which accounts for 40% of the total solid waste discharge and 66% of the annual utilization ratio. The utilization of fly ash is mainly concentrated in big cities and developed coastal areas. The use of wet fly ash, including fly-ash-residue, from small and medium size coal-fired power plants is low in the inland areas. Stacking waste requires large funds to develop the ground which not only requires vast stretches of cultivated land but is also harmful to the environment.This thesis is based on the Chongqing science and technology project—the research of the fly-ash-residue application in the trunk and rural highway construction which focus on the application of the fly-ash-residue emitted from Anwen Power plant in Chongqing Qijiang county in the road construction. In this paper, it has analyzed the physical and chemical properties of the fly ash, and the hydration mechanism of the fly-ash-residue concrete starting on the activation and hydration characteristics of the fly-ash-residue. The economic and reasonable lime mixing amout and its effect on the fly-ash-residue were worked out by activing the activity of the fly-ash-residue separately when blending some different kinds of chemical activator in different mixing amount of the quick lime. This paper putted forward the mixing ration of the pavement concrete in different classic road by the experiment with blending the 16 low-volume and 20 high-volume fly-ash-residue concrete that analyzed the working performance , physical and mechanical properties of the fly ash concrete. The study on the durability of the different mixing amout fly-ash-residue concrete provided a scientific basis for application of the fly-ash-residue.This paper indicated that the fly-ash-residue can be used into the pavement concrete construction when activated reasonably in a rational proportion. The flexural strength of the concrete can meet the needs of heavy traffic and middle traffic valume and the when the fly-ash-residue replacement rate is 10%~15% mixing reasonable cement content and the light traffice volume when the fly ash mixing amout is 100~150kg/m3 mixing reasonable cement content. The cement can be saved if the fly ash was adopted in the concrete.Economic analysis on the fly ash used in the pavement concrete construction shows that it can save 7% of the cost under the same situation which can create a high economic benefit. The use of the fly-ash-residue can also achieve great social benefit by recycling the resources, lessening the occupation of the arable land, protecting the environment and so on.

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CLC: > Transportation > Road transport > Road works > Road construction materials
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