Research On Thermal Stablity Of Guss Asphalt

Guss asphalt has the excellent waterproof, anti-aging, resist fatigue as well as to the steel bridge panel excellent chase from sex etc special properties, is widely used in recent years in the steel bridge deck pavement. Guss asphalt thermal stability is good or bad, to the use of steel deck plate paving quality plays an important role. Guss asphalt grading components to improve and to ensure that its thermal stability is very important, plus in most regions of China summer generally high temperature, so we must pay attention to the hot mixture stability study. At present, Guss asphalt heat stability research mainly focuses on the characteristics of the asphalt, asphalt content, experiment temperature, which has made some achievements, but has not proposed increasing pouring type mixture of thermal stability method.This paper from the domestic and foreign in steel deck plate paving the good result of the basis, taking hebei province transportation hall2010science and technology plan projects the mountainous area highway pavement complete set technology of high performance of cement concrete bridge deck of asphalt concrete pavement system application research, chongqing construction group technology innovation management project "grass back Yangtze river bridge steel box girder bridge deck pavement key technology of casting type of asphalt concrete experimental research and optimization of oil pouring type asphalt concrete material combination of modified asphalt developmental research the three topics as the backing, burning hot area heavy-load transportation long-span steel bridge deck pavement for research background, from grading components, cementation, the nature of the material, the nature of the sand, ore powder property this aspects of the influence of thermal stability of Guss asphalt factors of the system test and analysis and research.Through the research found that the change of grading components, cementing material varieties and dosage, the composition of different sand change, kuangfen material and fine degree change on Guss asphalt thermal stability is an influence, test show that reduce the dosage of fine aggregate to effectively improve the distribution in the thermal stability, coarse aggregate to increasing Guss asphalt thermal stability is not obvious, Different kinds of cementing material thermal stability of the effect is different this paper USES the#1,#2and#3three cementing material,1#thermal stability the best effect,2#doesn’t fit as asphalt concrete pouring type. The same system of the cementing material, USES the softening point and viscosity of the cementing material high can improve Guss asphalt thermal stability; Natural sand increase dosage, reduce the dosage of sand mechanism, can improve Guss asphalt thermal stability; Ore powder material of different type of Guss asphalt hot stability has a great influence, limestone ore powder the best effect, basalt, is the second smallest, and quartzite is the worst. Ore powder fineness of Guss asphalt heat stability also have influence, by comparing three powdered ore (200eye,600eye,1000eye) found that600mesh ore powder of Guss asphalt high low temperature performance and construction workability is the best.