Experimental Study On The Thin Polymer Overlays Of The Lightweight Composite Deck System

To solve the challenge of the fatigue cracking and the fragile pavement of steeldeck, the authors’ research team proposed a combination of bridge structure, namelySteel Bridge Deck+STC, on the basis of theoretical study and properties of materials.In order to protect STC against the impact of road wear and external environmentalfactors, and improve the skid resistance of the pavement, it is necessary to study deckwearing course matching with STC. Due to the excellent performance of TPO, thisstudy applys it to the composite structure of Steel Bridge Deck+STC, and introduces alight composite structure of Steel Bridge Deck+STC+TPO. In this thesis,experimental studies are conducted on the light composite structure of Steel BridgeDeck+STC+TPO to investigate the bonding performance and durability of TPO. Themain works are as follows:(1) Based on the analysis and study of the application status of thin polymericwearing course at home and abroad, this study applys the excellent performance ofTPO to the composite structure of Steel Bridge Deck+STC.(2) To solve the structural damage caused by the lack of bond force betweenlayers of bridge deck pavement, this thesis studies the bond performance of thepolyurethane epoxy resin itself; oblique shear, compression shear and pull-off sheartests are used to test interlayer adhesion performance of TPO-STC structure; throughthe flexural experiment for the composite beam, this thesis evaluates interlayercontinuity of the structure by tesitng the relative displacement between layers of theTPO-STC structure. The results show that polyurethane epoxy provided sufficientshear strength to make good adhesion between the upper and lower; bond status of thelayer between TPO and STC are in good condition, and bond strength and shearstrength are still maintaining good under normal atmospheric temperature and hightemperature; TPO can provide excellent bonding performance, resin of TPO-STC canbear the slight relative displacement caused by load effect to ensure that the structurecan bear the force integrally.(3) By testing the high temperature performance, water stability and hightemperature aging performance of the composite structure of TPO-STC, this thesisevaluates the durability of TPO. The results show that TPO still maintain a very highfriction values and surface texture depth to ensure the safety of the cars, also high temperature aging and freeze-thaw cycle slightly affect the friction value and surfacetexture depth, no rutting sign during the tests and also have strong pull strength ensureTPO-STC system work as a whole.(4) According to the test results of this thesis and the related engineeringexperience, this thesis which provides construction technology references forpractical engineering application, proposes construction techniques with theapplication of TPO to the light composite system, introduces storage and mixing ofthe resin material during the construction process, the treatment of STC bridge deck,the Broom-and-seed Method and the technical requirements in detail.