A test method used in the European standard "EN 14691 Flexible sheets for waterproofing - Waterproofing of concrete bridge decks and other concrete surfaces through which vehicles can pass - Compatibility with thermal conditioning" is used to evaluate the compatibility of the waterproofing system applied to the concrete surface and covered with an asphalt layer. is explained. According to this method, the entire system is subjected to an accelerated thermal conditioning and then the shear strength properties are determined before and after thermal conditioning.
New technologies are increasingly being used for waterproofing concrete bridge decks and other concrete surfaces that vehicles can pass through. For example, recently, composites produced by combining a bentonite layer with selected properties between two geotextiles, normally by needle punching processes, have been used. When this composite is moistened, a very low permeability lining system is obtained, which is used to construct geological barriers and waterproofing systems. This composite is also laminated with polymeric films or thin membranes to increase its durability and reduce its permeability for more demanding applications. In this way, strong and reliable flexible coatings are produced for waterproofing. These materials are also tested for compatibility with heat conditioning.
Liquid-applied bridge deck waterproofing kits consist of a material or combination of materials, at least the main component of which is in liquid form, applied to concrete or steel bridge decks. These kits may contain the following components as defined by the manufacturer:
Liquid applied materials are applied by pouring, brushing, spraying or spreading in single or multiple layers to the existing surface of a bridge deck to provide a permanently waterproof membrane after curing. The kits obtained by assembling liquid-applied waterproofing kits must be completely adhered to the substrate. This application covers liquid-applied bridge deck waterproofing kits consisting of in-situ liquids based on polymers (including resins) such as:
The procedures described in the EN 14691 standard can be used to evaluate the effect of different substances coming into contact with these products.
To maintain its integrity as a waterproofing layer, the kits must be capable of withstanding shear forces between the kits and the backing sheathing due to traffic or differential thermal movement.
Compatibility testing with heat conditioning
The maximum shear strength between the waterproofing layer and the concrete or steel support or coating is determined according to the "EN 13653 Flexible sheets for waterproofing - Waterproofing of concrete bridge decks and other concrete surfaces open to vehicle traffic - Determination of shear strength" standard. The test is carried out under application conditions on a sample type prepared in accordance with the "EN 13375 Flexible sheets for waterproofing - Waterproofing of concrete bridge decks and other concrete surfaces open to vehicle traffic - Sample preparation" standard.
The application temperature of the mastic asphalt coating is 250 degrees unless the maximum temperature specified by the manufacturer is below 250 degrees, then the coating is applied at the maximum temperature specified by the manufacturer.
The test must be carried out in conditions before and after heat conditioning in accordance with the EN 14691 standard. This requirement applies only to coated non-exposed kits.
Among the numerous testing, measurement, analysis and evaluation studies carried out for businesses in various sectors, our organization, with its trained and expert staff and advanced technological equipment, has established "EN 14691 Flexible sheets for waterproofing - Waterproofing of concrete bridge decks and other concrete surfaces that vehicles can pass through - It also provides testing services defined in the "compatibility with heat conditioning" standard.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
