Research On The Stress Absorbed Layer Composite Materials Of The New Steel Bridge Deck

With the rapid development of transportation industry, a large number of bridges whichhave graceful modelling, novel structure forms were built. With the development of bridgeindustry, deck pavement technology has also been drawing widespread attention, especiallyfor steel deck pavement. The disease of steel deck pavement in our country is mainlypresented as fatigue cracking, rutting and bond layer failed, etc. Research on steel deckpavement material should have the following functions: good waterproofness, high adhesionand good reflection crack prevention, etc. In this paper, we mainly study a new type ofpavement material used as stress absorbing layer for steel bridge deck which has goodperformance of waterproofness, high adhesion and reflection crack prevention also has goodcompliance with deck which can bear larger strain without damage.First, through the orthogonal experiment we get the preliminary formula of asphaltbinder by testing its penetration, softening point and ductility, then verified by135℃viscosity,tensile strength and low temperature tm test to confirm the final material proportion. Afterthat carry on mixture design by simulating the molding method of Marshall specimen, basedon the Marshall stability to confirm the optimum compaction times is80, temperature is140℃. Then combined with the cone penetration, compressive resilient modulus, compressivestrength and Marshall stability to determine the optimum dosage of carbon black, at lastthough the PJTR performance, moisture resistance property, anti-fatigue performance toverify the pavement performance of our stress absorbing pavement material.As a new a new type of steel bridge deck pavement material, the stress absorbing layerpavement has a similar high-temperature behavior to common asphalt mixture, but the low-temperature behavior, moisture resistance property and anti-fatigue performance is better thanthe latter. Besides, due to the smaller density carbon black, our product has the importantcharacter for its small specific gravity. The bulk specific gravity of our product’s Marshallspecimens is1.24g/cm3, only half of the common asphalt mixture, which can effectivelyreduce the stress to bridge deck.