Study On The Materials And Performances Evaluation Of Warm Asphalt Mixture And Warm Asphalt

At present, the asphalt pavement in road construction using the traditional hot mix asphalt,hot mix asphalt mixture to the mixing construction high temperature, to spend a lot of energyto produce large amounts of exhaust gas, dust, and in the construction process,pollute thesurrounding environment and the health ofconstruction workers, to compensate for hot mixasphalt mixture insufficient,scientists developed this new product of the warm mix asphalt,warm mix asphalt mixture mixing construction temperature between the hot mix asphalt andcold mix asphalt, can not only save energy, but also effectively reduce the emission ofharmful gases and dust, while maintaining a hot mix asphalt mixture is basically the samewaywith the performance. The growing emphasis on environmental protection and energyconservation, research and development of warm mix asphalt technologyhas greatsignificance. Ministry of Communications Highway Research Institutedeveloped its own RFwarm mix additive in this article selected as a key object of study, material and performancetests of the system to add the above-mentionedtemperature and mixed with the agent of theasphalt and asphalt mixture, and a comprehensive comparative analysis and evaluation.The RF temperature asphalt penetration, penetration index, ductility, softeningpoint,Brookfield viscosity test and found that RF can significantly enhance the asphalttemperature performance, and effectively reduce the viscosity of bitumen, but thelow-temperature properties of asphalta slight adverse effect and zero-shear viscosity testmethods corresponding test and found that the RF can increase the viscosity of theasphalt inthe60°C and75°C under the conditions of temperature and viscosity ofwarm mix asphalt,the asphalt pavementThe rut prevention plays an important role.The article also abroad awarm mix asphalt performance comparison test.Warm mix asphalt pavement performance evaluation, and make recommendations totheRF blending ratio of3%, reduce the compaction of25℃. Add the RFtemperature mixedmodifier, the asphalt mixture dynamic stability more markedly improved, Warm Mix AsphaltMixtures with ordinary asphalt mixture, and meet thespecifications of Asphalt Mixturestability requirements. Gyratory compaction energymaster curve, with the proportion in the 3%doped, reducing compaction temperatureconditions of25℃add RF, warm mix asphaltmixture can better meet the pavement compaction requirements, and better pressure The realefficiency.Temperature and mixed with modified asphalt mixture SPT dynamic modulustest,according to the time temperature equivalence principle, the use of three kindsoftemperature, frequency of10kinds of dynamic modulus of asphalt mixture dynamicmodulus master curve sigmoidalmodel method, provide a more accurate dynamicmodulus forpavement design parameters.Evaluation of warm asphalt mixture at low temperature cracking method, using amixtureof low-temperature bending experiment, get the low-temperature bending of the asphaltmixture to undermine the relationship with the temperature T from theenergy point of view.Burgers model, low-temperature bending creep test, thecorresponding parameters of themodel, and in accordance with the principle ofviscoelasticity, the use of the Burgers model,assuming that the correspondingtemperature drop, thermal stress formula, according to thestrain energy the definition of the corresponding numerical calculation can the destruction ofthe asphalt mixture.And low temperature cracking estimates were obtained70#asphaltmixture at about-20℃, the RF warm mix asphalt abroad warm mix asphalt at about-15℃,low temperature cracking phenomenon will occur at about-10℃.And the RF Warm Mix Test Road were tracking detection, RF Warm Mix Asphalttechnology costs increased slightly, but can significantly reduce energy consumption andemissions of harmful gases, and can better meet the construction requirements.