Load-bearing behavior of wall elements with formwork anchors integrated in the insulation material

Figure: TU Kaiserslautern

1 Representation of the wall system according to [4] in the stage of construction and of the spacer

Figure: TU Kaiserslautern

2 Stress on the wall system due to a fresh concrete pressure loading condition

Figure: TU Kaiserslautern

3 Experimental set-up and load-deformation diagram of the centric pull-out test of the spacers from the thermal insulation material at a nominal anchoring depth of 80 mm

Figure: TU Kaiserslautern

4 Individual and mean values of the ultimate load of centric pull-out tests on the spacer from the thermal insulation material using varying anchoring depths

Figure: TU Kaiserslautern

6 Representation of the test specimens and the experimental set-up

Figure: TU Kaiserslautern

7 Measured fresh concrete pressure over the component height for all compaction processes and comparison with the fresh concrete pressure according to DIN 18218 [6]

Figure: TU Kaiserslautern

Matthias Pahn (1977)

Studied civil engineering at the Bauhaus University Weimar. From 2003 to 2004, he was structural engineer in the building industry with Schmitt, Stumpf, Frühauf & Partner Ingenieurgesellschaft (SSF) in Berlin. Since 2005, he has been working with Pahn Ingenieure GmbH. From 2005 to 2010, he was research assistant at the Institute of Concrete Structures and Structural Engineering of the Technical University Kaiserslautern. From 2010 to 2015, he was junior professor at the Technical University Kaiserslautern, responsible for teaching energy-efficient buildings. Since 2015, he has been professor for structural design and precast construction at the Institute of Concrete Structures and Structural Engineering of the Technical University Kaiserslautern.

Andreas Schmitt (1987)

Studied civil engineering at the Technical University Kaiserslautern. From 2012 to 2016, he was research assistant at the In-stitute of Concrete Structures and Structural Engineering of the Technical University Kaiserslautern. His research areas include non-metallic reinforcement materials, fresh concrete pressure in element walls and prestressed systems for reinforced-concrete construction. He has been project manager in the field of research and development with BBV Systems GmbH since 2017.

Stefan Carstens (1991)

Studied civil engineering at the Koblenz University of Applied Sciences. From 2013 to 2015, he was research assistant at Koblenz University of Applied Sciences. He has been research assistant at the Institute of Concrete Structures and Structural Engineering of the Technical University Kaiserslautern since 2015. His research areas include multi-layer reinforced-concrete wall elements and sandwich anchors made of fiber-reinforced plastics.

This paper presents a multi-layer wall system where the facing layer of a core-insulated element wall system is substituted by the render system of an ETICS. In the stage of construction, spacers assume the function of formwork anchors in the thermal insulation material. This combines the advantages of a reduced facing layer thickness with the semi-precast construction method.

Increasing thermal and acoustic requirements on external wall systems more and more demand for multi-layer wall structures. Wall panels made of precast concrete elements fulfilling these requirements include sandwich walls, core-insulated element walls and monolithic precast walls with an external thermal insulation composite systems (ETICS) installed in situ, for example. In the final state, these systems have a three-layer structure consisting of load-bearing layer, internal thermal insulation and weather protection layer. The wall system presented in this paper is a core-insulated element...