Experimental Study On Ultra-Thin Bridge Deck Pavement Structure

With the increasing number of bridge constructions in the 21st century,the requirements for bridge pavement are getting higher and higher,requiring lightweight,high-strength,and more durable materials.The thick and high-density asphalt concrete pavement layer increases the difficulty of constructing long-span bridges.In addition,asphalt concrete is sensitive to temperature and is prone to problems such as ruts,cracking,delamination,and congestion under high temperatures and heavy loads.Therefore,finding an ultra-thin and wear-resistant bridge pavement material and structure that matches the performance of the bridge has become a research trend.To this end,using polymer materials,a structure of an ultra-thin bridge pavement layer with a waterproof bonding layer and a wear-resistant layer integrated has been studied,focusing on the research of ultra-thin pavement layer materials and interlayer bonding properties,mainly including the following aspects:(1)We investigated the fundamental characteristics of polymer materials in ultrathin pavement layers by subjecting new polymer materials to carbonization,freeze-thaw,construction depth,BPN swing value,and anti-seepage tests.The test results show that the new polymer materials have good resistance to carbonization and freeze-thaw,and have good anti-skid and waterproof performance in terms of road surface performance.(2)To investigate the influence of coating amount and loading rate of ultra-thin pavement sublayer materials on the interfacial bonding properties of different bridge deck panels,shear and pull-out tests were conducted.The results show that the ultrathin pavement sublayer material exhibits excellent interlayer bonding strength between both concrete and steel bridge decks.The optimal coating amount varies between the two types of bridge deck panels,but an increase in coating amount shows a trend of initially increasing and then stabilizing.As the loading rate increases,the interlayer bonding strength of different bridge deck panels also increases.In addition,the coating amount has a greater influence on the bonding strength than the loading rate.(3)To investigate the influence of surface roughness on the bond strength between the ultra-thin pavement layer and the concrete bridge deck,the concrete interface was grooved and scarified.The experimental results showed that the scarified treatment had the best bond strength,followed by the grooved treatment,while the smooth interface had the worst effect on the bond strength.(4)In order to investigate the optimal curing time for the ultra-thin pavement sublayer,the bonding strength of sublayers with different curing times was tested.The results show that the bonding strength of the ultra-thin pavement structure is greatest when the sublayer is cured for 60 minutes.(5)Through indoor testing to simulate the aging of ultra-thin pavement structures under adverse environments,we aimed to explore the effects of temperature variation and sunlight exposure.We conducted tests on bond strength,construction depth,BPN swing value,seepage coefficient,and quality loss before and after the aging process.The research found that the interlayer bonding strength of the ultra-thin pavement layer decreased slightly after being subjected to adverse environmental factors such as high and low temperatures and high-temperature ultraviolet radiation cycles,but still maintained good strength.The ultra-thin pavement layer that underwent multiple cycles of aging still exhibited excellent performance in terms of anti-skid,waterproof,and antipeeling properties,indicating that the impact of environmental aging on its road surface performance can be basically ignored.