Study On Trinidad Lake Asphalt Modified Asphalt Action Mechanism And Mixture Performance

Trinidad Lake Asphalt has been utilized wildly due to its special excellent properties.However, there are asphaltite and ash existing in Trinidad Lake Asphalt, in which the specialeffect of ash has not been known enough. Also, there is no evaluation system of asphaltbinder and asphalt mixture of Trinidad Lake Asphalt application in the southern China. In thepresent study, the Trinidad Lake Asphalt modification mechanism was investigated firstly,and the influences of ash and asphaltite on the Trinidad Lake Asphalt modified asphalt wereanalyzed. The evaluation indexes of Trinidad Lake Asphalt modified binder were proposedbased on the above study. Thereafter, the factors influencing the performance of TrinidadLake Asphalt modified asphalt mixture were analyzed and discussed. On the basis of thementioned work, the evaluation system of Trinidad Lake Asphalt modified asphalt mixtureand mixture design method were established. And they were applied in the real project. Thefollowing conclusions were drawn on the basis of the study.(1) The modification results of asphaltite in Trinidad Lake Asphalt on different baseasphalts are depent on the type of the base asphalts significantly. And this effect is notsensitive with the experimental temperatures. Smaller size of larger specific surface area ofash result in the bigger specific work of adhesion within the Trinidad Lake Asphalt modifiedbinder. And this is one of the main reasons that the Trinidad Lake Asphalt modified binderhas good high temperature performance.(2) The performance of asphalt mortar is improved by adding ash, in which about15%influence is ash as a filler (larger specific area), and about85%influence is ash as anmodifier in this system. With the increase of Trinidad Lake Asphalt content, the contributionof ash on the rutting factor of Trinidad Lake Asphalt modified asphalt is reducing gradually,and the influence of asphaltite on the rutting factor is increasing. The effect of the ash as afiller in the Trinidad Lake Asphalt modified asphalt improving the rutting factor is about6.8%, and the effect of the Trinidad Lake Asphalt as a modifier is about93.2%. In the DSRtest of Trinidad Lake Asphalt modified asphalt, the rest results need multiply the factor of0.932to remove the influence of as as filler, not as a modifier.(3) The ash deposition during the sample preparation of Trinidad Lake Asphalt modifiedasphalt has a great influence on the routing indices, which are not appropriate to evaluate theTrinidad Lake Asphalt modified asphalt. The PG test of SHRP research achievement canevaluate the Trinidad Lake Asphalt modified asphalt effectively. Different modified asphaltshave significant difference of PG indices. TAL modified asphalt in South China application technical requirements of PG are proposed.(4) The adding process has the most influence on the performance of the Trinidad LakeAsphalt modified asphalt mixture; the next two are the addition of Trinidad Lake Asphalt andgradation, respectively. The type of base asphalts has the least influence on the performanceof the Trinidad Lake Asphalt modified asphalt mixture.(5) Ash as asphalt mixture filling, which can effectively improve the high-temperaturestability of asphalt mixture, relative to the general powder, asphalt mixture dynamic stabilitycan be improved about50%.Taking the high temperature performance and water stabilityinto account, the ash in the Trinidad Lake Asphalt should be considered as an additive duringthe Trinidad Lake Asphalt modified asphalt mixture design, in which the effect of it on themixture gradation is ignored.(6) Marshall method is adopted as the Trinidad Lake Asphalt modified mixture designmethod. The dry processing of Trinidad Lake Asphalt addition is applied in the preparationof Trinidad Lake Asphalt modified asphalt mixture. In the evaluation indices of TrinidadLake Asphalt modified asphalt mixture in South China, the dynamic stability is selected toevaluate the high temperature performance; and the residue stability and freezing-thawingsplit strength is chosen as the water stability index. And the specific technical requirementsof high temperature stability and water stability for Trinidad Lake Asphalt modified asphaltmixture in South China are proposed.