| China is a big country which produces soda. Now, ammonia-soda process is the main production method. Industrial alkaline residue is a white precipitate by means of soda production by ammonia-soda process. About 3.5 million ton of alkaline residue is manufactured occupying a large amount of land resources every year in china. Dry alkaline residue easily generates dust phenomenon in the wind, formating of "alkaline residue haze", which seriously pollutes the local atmospheric environment. Shandong HaiHua group piles up two "alkaline residue mountain" at present. Due to the accumulation of long time, alkaline residue solution has been slowly permeated to underground soil and bohai bay, which leads to seriously pollute the sea water and soil, and hinders the development of bohai seacoast construction and ecological environment construction.According to statistics, road construction in our country can reach tens of thousands of kilometers every year. Roadworks has a great demand for road materials If "alkaline residue mountain" are consumed away in construction, it will not only improve the environment pollution, but also ease tight supply of road materials. It is important engineering significance for alkaline residue applying to road subbase construction. Under the support of Shandong Province Science and Technology Project: “Study on Making Use of Industrial Waste Alkaline Residue Paving Roadbed and Subbase(2013A06-01)” and under the help of Weifang Highway Administration Bureau and Shandong Haihua Group Corporation Ltd, the paper systematically carries out indoor experimental research about engineering characteristics of alkaline residue. This paper carries out research from the following four areas aiming at pavement performance of alkaline residue:Firstly, the paper introduces the current research status at home and abroad, and summarizes kinds of application of alkaline residue in different aspects at present.Secondly, the paper analyzes physical performance indicators of alkaline residue, for example, moisture content, specific gravity, liquid and plastic limits etc. Using different methods of chemical experiment indicates that the main composition of alkaline residue is calcium carbonate and calcium sulfate with hydrate, together with silicon, magnesium, aluminum, iron oxide as alkaline residue’s internal space frame; From microstructure, it maily studies alkaline residue particles’ distribution characteristics and expounds strength mechanism of alkaline and alkaline residue stabilized soil, which finds out the connection between microscopic alkaline residue and macroscopic mechanical properties.Thirdly, combining with the feature of weifang district traffic and climate environment, it stars to mixture design of alkaline residue stabilized soil. Through the unconfined compressive test, triaxial compression test, CBR test is to evaluate the mixture strength, and use MTS material to analyze anti brushing performance of alkaline residue stabilized soil, which gets the mixture owning strength and durability.Fourthly, full-scale model test about industrial waste alkaline residue paving road subbase is still in a blank stage in our country. Based on equal thickness structural model test MTS is an effective method that evaluates the performance of pavement structures. So in order to fully research engineering properties with alkaline residue paving road subbase, the paper designs a equal thickness structure fatigue model based on MTS, which simulates road subbase stress, strain variation rules in different dynamic case, in different locations and at different frequencies. Evaluation and analysis road performance of alkaline residue paving road subbase on this basis. |
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