Road Performance Research Of The Whole Four-waste Road Base Modified By Waste Gypsum

With the steady development of China’s economic, transportation construction has been included as the focus of national infrastructure. Local roads is an important infrastructure of the national economy, and also the important link of communication of the urban and rural supplies.Therefore, the strengthening of local road construction is particularly important. The local road construction is characterized by multi-line, volume, and a wide range. But an important, can not ignored problem is the lacking of construction funds or insufficient funding sources. Thus, under the premise of ensuring the quality of road construction, how to explore the potential to reduce road construction costs,to build and use the low-cost road which performance meets the requirements has became an important topic that the local road construction is facing on. On the other hand, the emissions of various of industrial wastes like gangue, fly ash, electric lime,waste gypsum increases yearly, but they has low utilization.Their dumping not only takes up a lot of land, but also causes serious environmental pollution. Industrial wastes so that has beenbecome a social nuisance, urgently need to seek an effective way of comprehensive utilization of industrial waste.Combined with the traditional road base material-two gray gravel, the latter has low early strength, high cost and other defects.Therefore, this research designs the using of whole four-waste mixture which made of electric lime, fly ash stabilized gangue modified by waste gypsum to the road base.The purpose is to reduce the cost of the project, give full play to the advantages of the two-gray gravel class base material, and effectively compensate for its shortcomings, thus it can open up a new way of road base which has low-cost and high-performance. The main contents of the research are as follows:(1)On the basis of literature data, give respective discussion of current research on application of the whole four-waste raw materials (gangue, fly ash, electric lime and waste gypsum);(2)Make inductive research on respective physical and mechanical properties and the road performance of the gangue, fly ash, electric lime and waste gypsum, which proves the theoretical feasibility using the mixture that maked up by these four kinds of materials to road base;(3)Study on the strength and early strength formation mechanism of the whole four-waste mixture, Not only including the role of gangue, fly ash, electric lime and waste gypsum, but also the comprehensive mechanism action of primary mixture;(4)Experimental research on the basic performance of the raw materials used in the test, and make analysis and evaluation using the nature of the raw materials required by the specification;(5)Experimental research on the mixture ratio according to the four groups of the mix design program(including compaction test, unconfined compressive strength tests, etc.), and select the best ratio of the whole four-waste base material after the comparison analysis of the test results;(6)To prepare the mixture according to the best ratio, and study on the main road performance indicators of the mixture (including the compression modulus, bearing ratio, shear strength, etc.).It showed that using the mixture of the the whole four-waste modified by waste gypsum to road base is entirely feasible by the road performance test study on the mixture. It not only has stable road performance and high early strength, but also make full use of industrial waste, reduce costs, and avoid environmental pollution. Thus, it can explore a low-cost, high performance, energy saving and environmental protection new way applies to the two and following two road base.