Study On Multi-level Application For Three Types Industrial Waste Residue On First Class Highway

The highway reconstruction project of Yun Chi bridge to Yun Chi harbor section is one part of the318National Highway Yichang section reconstruction project. Because the high precipitation during the construction period, the earth and stone of excavation section have a high water content, most cannot be directly used as roadbed filler. Near the Yichang section of318national highway every day prduce a large number of industrial solid wastes:inferior fly ash, calcium carbide residue (the same ingredients with lime, content ratio higher than lime) and phosphorus gypsum. Large amount of carbide slag, fly ash and phosphorus gypsum can’t be eliminated and disposed, long-term stacking,have taken up a lot of land, which brings heavy burden to the environment.This paper takes three types of industrial waste--carbide slag, fly ash, phosphorus gypsum slag which produced by Yichang Yihua group, as main raw materials, developed the research mult-level use them as a mixture in roadbed and pavement. The activity of carbide slag and fly ash system is not enough, the reaction rate is very low, so it is difficult to achieve to the design strength in a short time, therefore use the phosphorus gypsum and industrial protopine together as activator, to activate carbide slag and fly ash system.This paper at first studies the reaction between carbide slag and fly ash. Because the requirements of up road bed material strength is not high, considering the economic requirement,directly used the carbide slag and fly ash binder stabilized aggregate in up road bed without considering the activator. Firstly according to the7d strength to determine the two optimun proportion of the carbide slag and fly ash pure slag, then according to particle size distribution of the gravel soil,use7d higher strength binders and gravel aggregate to do mix proportion experiment, determine the optimal proportion of carbide slag, fly ash and gravel soil, applied in the on-site construction of up road bed, and did post-detection.In the base of road, use Protopine and Phosphogypsum active the carbide slag and fly ash system, binding with gravel soil, to replace the cement binder. In tests, firstly according to the7d strength to determine the optimun ratio of Protopine-Phosphogypsum and carbide slag, fly ash, then according to the design requirements, did mix experiment with the gravel soil, eventually select the optimun mixture ratio, and applied in the construction process. In the later stage of the project, considering the high cost of Protopine, and the shortcomings of caustic and operational difficulties, so improved the test formula, use the sodium sulfate to replace protopine phosphorus gypsum to activate calcium carbide slag and fly ash’s activity, through experimental analysis found that sodium sulfate’s activation is better than protopine-phosphorus gypsum.This research used on the318State Highway Yun Chi bridge to Yun Chi port section rebuilding project, firstly reduced the engineering cost, secondly solved the industrial waste accumulated in the vicinity, did contributed to the environmental protection, do the sustainable development and utilization, lay the foundation for the reconstrcution of hole line of318State Road and the application in the other road projects. Construct the road sections to resource saving type and environment friendly type road, can make demonstrative effect to the province and the hole country’s road construction and renovation.