Adhesive shear strength and sliding friction
of mineral foam insulated sandwich facades

Figure: TU Kaiserslautern

Fig. 1: Sandwich wall: A Facing panel; B Thermal insulation material; C Load-bearing panel; D Connector

Figure: TU Kaiserslautern

Fig. 2: Schematic load-bearing behavior of the thermal insulation material and the bar-shaped connector in shear, taken from [8]

Figure: TU Kaiserslautern

Fig. 3: Test rig for experimental tests

Figure: TU Kaiserslautern

Fig. 4: Load-displacement diagram for test MF1-C50/60-1.0-1

Figure: TU Kaiserslautern

Fig. 5: Adhesive shear strengths of the tested mineral foams

Figure: TU Kaiserslautern

Fig. 6: Coefficient of sliding friction μ over the sliding displacement s. Left: influence of different ultra-light mineral foams. Right: influence of different normal stresses σN on the coefficient of sliding friction μ

Figure: TU Kaiserslautern

There is currently a lack of basic knowledge regarding the structural behavior of ultra-light mineral foams used in precast sandwich walls. To close this gap, this article discusses and analyzes experimental tests carried out to determine the adhesive shear strength and sliding friction between ultra-light mineral foam and standard concrete.

Concrete sandwich wall panels prefabricated at the precast plant have been used as external wall systems for many years and have proved to be a viable solution in construction practice. They provide a wide range of design options while meeting the increasingly demanding requirements for thermal insulation. The major share of currently used insulation materials is petroleum-based. The firm bond between the organic insulation material and the mineral-based concrete results in a composite that is difficult to dispose of, thus preventing the subsequent recycling of concrete sandwich walls.

To...