Ductility of 3D printed concrete reinforced with short straight steel fibers

By Fred Bos, E. Bosco, Tam Theo Salet. Virtual and Physical Prototyping, 2018

195 citations recorded by the source corpus.

ABSTRACT With the number of 3D printed concrete structures rapidly increasing, the demand for concepts that allow for robust and ductile printed objects becomes increasingly pressing. An obvious solution strategy is the inclusion of fibers in the printed material. In this study, the effect of adding short straight steel fibers on the failure behaviour of Weber 3D 115-1 print mortar has been studied through several CMOD tests on cast and printed concrete, on different scales. The experiments have also been simulated numerically. The research has shown that the fibers cause an important increase in flexural strength, and eliminate the strength difference between cast and printed concrete that exists without fibers. The post-peak behaviour, nevertheless, has to be characterised as strongly strain-softening. In the printed specimens, a strong fiber orientation in the direction of the filament occurs. However, this has no notable effect on the performance in the tested direction: cast and printed concrete with fibers behave similarly in the CMOD test. For the key parameters, no scale effect was found for the specimens with fibers, contrary to the ones without. Numerical modelling of the test by using the Concrete Damage Plasticity material model of Abaqus, with a Thorenfeldt-based constitutive law in compression and a customised constitutive law in tension, results in a reasonable fit with the experimental results.

Subfields: Automotive Engineering, Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/22170b36b0ca34a80c4102baa40c642880248832

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Automotive Engineering

1. J. Sanjayan
2. B. Nematollahi
3. V. Mechtcherine
4. Fred Bos
5. G. V. van Zijl
6. Richard A. Buswell
7. R. Wolfs
8. S. Figueiredo

In Building and Construction

1. J. Sanjayan
2. B. Nematollahi
3. V. Mechtcherine
4. Fred Bos
5. G. V. van Zijl
6. Kequan Yu
7. Jinlong Pan
8. R. Wolfs

In Civil and Structural Engineering

1. J. Sanjayan
2. B. Nematollahi
3. V. Mechtcherine
4. Jinlong Pan
5. Kequan Yu
6. Fred Bos
7. Victor C. Li
8. G. V. van Zijl

Citations in the corpus

• On the emergence of 3D printable Engineered, Strain Hardening Cementitious Composites (ECC/SHCC) (2020, background): “In most cases, fi ber orientation parallel to the fi lament print direction is observed, often coinciding with increased tensile strength in this direction [39,41,43,44].”
• Integrating reinforcement in digital fabrication with concrete: A review and classification framework (2021, methodology): “printing direction [52]; c) 3D-printing process with UHPFRC reinforced by short steel fibres [53]; d) 3D-printing process with SHCC containing PE fibres [54].”
• Additive manufacturing in construction: A review on processes, applications, and digital planning methods (2019, unknown): “It was proposed to determine the material model from uni-axial tensile tests instead because it may be less ambiguous [180].”