Research On Several Key Technologies Of Warm Mix Asphalt

At present, our country is being in the highway construction and the maintenance fast development time, several million tons of HMA(hot mix asphalt) are produced in every year. As a signatory country of Kyoto protocol, our country are confronted with challenges coming from energy and environment, and will undertake the enormous task to reduce a big amount of carbon emission in future.Reducing the greenhouse gases and the air pollutant emissions and energy conservation are the important issues in relation to the national economy and the people's livelihood of our country. The popularization and application of WMA(warm mix asphalt) technology in the highway construction, not only may reduce the consumption of energy,but also protect the environment. Moreover, it can improve the project quality, make the contribution for the sustainable development, whith can harvest huge social and economic benefits surely.Based on the full understanding of the research and development condition of WMA at present, this paper proposed the Marshall design method in variable temperature and variable compaction times for WMA with chemical additive. The volume characteristic, mechanical strength propertie, pavement performance, construction technology and the technical economic analysis of WMA have been studied systematically in this paper.The results show that:In the compaction temperature range which is determined by the Marshall design method in different temperatures and in different number of compaction, the intensity and mechanics characteristic of WMA with organic viscosity-reducer is roughly equal to HMA. The high temperature rutting resistance performance obtains the further enhancement is better than HMA, but the low temperature crack resistance and the water stability is not very different. Meanwhile, the construction technology of WMA is summarized and the technical and economic evaluation of WMA is analysed in this paper,which can provide the reference for the popularization and application of WMA and the related technology standard for WMA.