Investigation into the Integration of Impregnated Glass and Carbon Textiles in a Laboratory Mortar Extruder (LabMorTex)

Abstract

A promising process for the automatization of concrete structures is extrusion or extrusion molding. An innovative approach is the extrusion of concrete with imbedded technical textiles as reinforcement. For a successful extrusion, the rheological properties of the fresh concrete have to be optimized, as it must be extrudable and have sufficient early strength after leaving the mouthpiece. Within the scope of this paper, a process was developed which allows the integration of flexible as well as stiff impregnated textiles into the extrusion process. For this purpose, different textile-reinforced mortars (TRM) were extruded and their material characteristics were investigated. The results show that the mortar cross-section is considerably strengthened, especially when using carbon textiles, and that extrusion has considerable potential to produce high-performance TRM composites. In uniaxial tension tests with TRM, as well as in the pure roving tensile strength tests, textile stresses of approx. 1200 MPa were achieved for the glass textile and approx. 2250 MPa for the carbon textile. The position of the textile layer deviated a maximal 0.4 mm from its predesigned position, which shows its potential for producing tailor-made TRM elements. In addition, by adjusting the mortar mix design, it was possible to reduce the global warming potential (GWP) of the extrusion compound by up to 49.3% compared to the initial composition from preliminary studies.

Material‐minimised construction with extruded textile reinforced concrete

“…Figure 2 Comparison of the roving tensile strength and uniaxial tension test conducted on extruded TRC specimens [11] The data presented in Figure 2 demonstrates that the TRC specimens achieved tensile strengths of up to 4000 MPa. The integration of sanded epoxy resin textiles, such as the Q43-CCE-21 Anticrack, is possible due to the horizontal mouthpiece integration.…”

Homogenisation for macroscopic shell structures with application to textile‐reinforced mesostructures

“…The dimensions of the major and minor axes of the ellipse are taken from µ-CT data and are given in Table 1. In a first step only the linear-elastic regime is to be analysed, the material properties for concrete and carbon textile are obtained from the authors of [7], see Table 2. The analysis is carried out in a displacement-controlled manner with u = 2 mm/m, similar to the experiment.…”

“…A second example verifies the application of the approach to textile-reinforced concrete structures in the linear-elastic regime. A tensile test, carried out on an extruded textile-reinforced mortar specimen [7], is used for comparison. In Figure 7 the test set-up is given and Fig.…”

Fuzzy 3D Fabrics & Precise 3D Printing - Combining research with design-build investigations

“…Currently involved in terms of reinforcement integration are RWTH Aachen and TU Dresden, Collaborative Research Centre/Transregio 280 (Subproject B01). Their focus is on the design and modeling of load-adapted and profiled textile reinforcement structures with spatial branched topologies (Kalthoff et al, 2021). The ETH Zürich on the other end investigates unreinforced concrete ceiling constructions, based on traditional vault structures and aspects of material behaviour and form-active geometry (Rippmann et al, 2018).…”