Laboratory Experiment Of Warm Mix Asphalt

In the highway engineering construction industry, warm mixing technology belongs toa new technology, which protects environment and saves energy. It can not only solve theproblem of excessive consuming energy resource and polluting the environment, but alsohas significant social benefits. Based on the laboratory experiments, it estimates theinfluence on the temperature-sensitive materials caused by variable temperature ofconstruction. Changing the mineral aggregates gradation, variable mixing design anddifferent asphalt binder type and so on, it is to produce excellent warm asphalt mixtures.Warm mix technique is usually divided into three categories. It selected two types ofthem and completed systematic tests. Three goals should be completed. Firstly, discuss theinfluence of lowering temperature on the asphalt binder; determine the constructiontemperature of WMA. Secondly, considering various factors, make a qualified asphaltmixture. The last one, carry out analysis of energy saving and emission reduction andevaluate the effect of warm mix tests.AASHTO were used as guide specifications, several asphalt experiments wererecommended, including rotary viscosity test, dynamic shear rheological test, bendingbeam rheological test. Experimental results suggest that for warm asphalt mixtures potentialrutting resistance is lower and low-temperature anti-cracking performance strengthen.Viscosity-temperature curve method to determine the construction temperature is notsuitable for warm mix. Modified mix design methods containing Superpave volumetricmethod and Marshall design method were used. Workability test results show thatworkability of warm mix asphalt is enhanced, although construction temperature is reduced.Related performance test indicate that warm mix asphalt concrete meet the requirement ofspecifications. Energy saving and emissions reduction analysis segments suggest that forwarm mix technique, energy saving rate is37%, emission reduction rate is30%.On the basis of systemic experimental study, warm mix asphalt application can bringhuge economic benefits and social environmental benefits.