Issue of Changes in Adhesion of Bitumen Sheet to Primary Layer over the Course of Time in Multilayer Waterproofing during Shear Testing

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS

土木建筑工程

Plachý, Jan^1 ; Vysoká, Jana^1 ; Vejmelka, Radek^1 ; Horský, Jan^2 ; Vacek, Vítzslav^3

Institute of Technology and Business in eské Budjovice, Department of Civil Engineering, Okruní 517/10, eské Budjovice

370 01, Czech Republic^1

Horsky, S.r.o., Klánovická 286/1, Praha 14

198 00, Czech Republic^2

Klokner Institute, Czech Technical University in Prague, Šolínova 7, Praha 6

166 08, Czech Republic^3

关键词: Bearing structure;    Breaking strength;    Concrete surface;    Czech Republic;    Insulating layers;    Insulation system;    Protective layers;    Sealing layers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022085/pdf
DOI  :  10.1088/1757-899X/245/2/022085

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

This paper is based on research dealing with defects that appear on concrete bridge decks with an insulating layer from asphalt strips on the interface between the asphalt strip and its basis. The durability and lifespan of the bearing structure of concrete bridge is determined by insulating layer that constitutes, together with the primary layer and a protective layer, the insulation system of the concrete bridge deck. Paints based on low viscosity epoxy resigns are one of the possibilities of primary layer implementation. These paints may be performed as anchoring-impregnation paints that usually represent single layer paint on the bridge deck surface. Sealing layer is another variant. Sealing layer is a multilayer consisting of anchoring- impregnation paint and sealing paint. The primary layers mainly provide vapour closing of the concrete surface, and partly, through roughening the surface, contribute to adhesion of bitumen (asphalt) insulation (waterproofing) layer. Application of the primary layer has been spreading in the Czech Republic since the 1990s. Now, after approximately 30 years of use defects in these epoxy based sealing layers at the interface between primary layer and waterproofing layer of reinforced bitumen sheets (RBS) are being solved in the Czech Republic. After performance of the first test focusing on breaking-strength, it was found that the strength between the asphalt and the primary belt layer in some types of low-viscosity resin-epoxy decreases and after a certain period of time again increases, depending on the time. Tensile strength test is carried out on a sample of asphalt strip, which is fused onto the substrate with a primer coat. It was therefore proceeded to test the shear adhesion. Testing of the shear adhesion is conducted on the entire concrete deck waterproofing system. It was supposed that the decrease of adhesion at this test become evident in higher extent. Adhesion tests in shear were performed on the primary layer consisting of an anchoring impregnation coating and sealing layer.