The Research Of Bitumen And Bitumen Mixture With Abandoned Rubber Powder

Our country's road asphalt mainly uses the paraffin-base crude refinement. Theasphalt temperature susceptibility in a big way, the pavement build with the asphaltoften becomes tender in the summer and sends the crisp dehiscence in the winter. Theearly destruction is serious. This kind of situation doesn't fit our country's highwayconstruction demand extremely. To above-mentioned problem, overload vehicle shouldbe restraint by administrative means, the same time road worker must improve asphaltand asphalt mixture uses performance. Adding the rubber powder in the asphalt is oneof the effective ways of realizing this goal to make and disperse the even modifiedasphalt. So use the old and useless rubber powder not only can improve asphalt andasphalt mixture uses performance but also can solve the difficult problem ofenvironmental protection. It is a good thing of achieving many things at one stroke. Itis very suitable way for our country's conditions. Through researching the fundamentalproperty of asphalt and rubber powder, we have studied rubber powder asphaltmixture's classification, composition and structure. Through the performance test ofthe rubber powder modified asphalt, we have studied the craft of mixing the rubberpowder and asphalt, have confirmed the best mixing temperature, the best powderamount of rubber and stability additive kind, have confirmed more rational mixingtime. Through combining this subject's actual conditions and past experience, we haveset up the index system which appraises modified asphalt performance have analyzedthe mechanism of modifying to the asphalt of rubber powder. Through the performancetest of the rubber powder asphalt mixture, we have set up the performance index ofappraising modified asphalt mixture. Through contrasting the test data of rubberpowder asphalt mixture with the test data of host asphalt mixture test, we haveanalyzed the mechanism of modifying to the asphalt mixture of rubber powder. Through a large number of testes, we know that use rubber powder modifiedasphalt can solve high-temperature stability and low temperature performance to resistsplit well. With content of rubber powder increase, low temperature prolong degree ofasphalt increases. The asphalt's softening point has improved obviously. Penetration oftemperature sensitiveness coefficient and penetration of indexes accord with thenational standard. The test proves that the content of the rubber powder is relativelygood in 15%, the better mix temperature is about 150 degrees Centigrade. The stability additive is a very important factor. A large number of experimentsprove that put the No. 160 high aromatic hydrocarbon oil as the stability additive rightamount, can improve the modify result greatly. The choice of additive for improving the property is very important factor too. Acommonly used one additive for improving the property is SBS. It is one styrene twoalkenes one styrene three copolymer, hot plasticity elastomer. SBS adopted as additivefor improving the property can improve the host asphalt resisting the performance offracturing in the low temperature and can improve the host asphalt being able to bearhigh-temperature performance and hot stability. But the price of SBS is high, the sametime SBS is difficult to mix with asphalt and the mixture is prone to phenomenon ofemanating, SBS modified asphalt is made with high shear device or colloidal to rub.Meticulous abolish rubber powder (rubber) as additive for improving the property hasheavy difference with SBS. First, the rubber powder sulfureted is dispersed evenlyamong the host asphalt with the tiny particle among the modified asphalt. Through thegood adhesiveness between rubber powder particle and asphalt, extension performanceand answer elasticity of rubber powder, the host asphalt's performance of extend andresist fracturing in low temperature has been improved. Second, rubber powder particleis sulfureted already. Rubber molecular structure presents and binds constructing,under the cooperation of various kinds of auxiliary, aging performance and hot stabilityperformance are superior. Use rubber powder as additive for improving the asphalt'sproperty can improve heat-resisting performance and heat stability. performance ofhost asphalt. So, some documents indicate the low-temperature performance andhigh-temperature performance of the powder modified asphalt material of meticulousrubber are the same as modified asphalt material of SBS, but some documents indicatethat SBS adopted can improve the host asphalt's low-temperature performance veryobvious but a bit to soften point. In addition, compared with SBS, meticulous abolish rubber powder as additive forimproving the property has a lot of advantages. First of all, meticulous rubber asadditive for improving the asphalt's property, the production technology is simple, theproduction cost is low, the rubber powder and asphalt are mixed and dissolved well.Secondly, its construction craft is the same as ordinary asphalt's. The rubber powderand asphalt needn't be dissolved and mixed at construction site. Needn't addconstruction device, and it is easy to use. Moreover, compared with other additive forimproving the property, rubber powder is abundant and cheap. Finally, meticulousabolish rubber powder as additive for improving the property is that one benefits thenation and the people. It is a good way to protect environment and a good project withcomprehensive benefit. So it has very much good popularization and applicationprospect. Analysis about rubber powder modified asphalt's micro structure that can besummed up for the following three: First, the structure change modifies; Second,dissolve modifies; Third, the enhancement of the rubber acts on modifies.Following conclusion can been draw through this text: The host asphalt added with meticulous abolishes rubber powder has reached theresult of modifying expected. The modified asphalt can be considered applying to...