Mechanical properties of layered geopolymer structures applicable in concrete 3D-printing
By Sarah Al-Qutaifi, Ali Nazari, A. Bagheri. Construction and Building Materials, 2018
190 citations recorded by the source corpus.
Abstract This paper focuses on inspecting the structural buildability of layered objects. Simulating extrusion method process was used to investigate three geopolymer mixes, three-time gaps, and two layering patterns through 18 layered samples. This paper also evaluates effects of the layering process on hardened properties of build-up materials through 9 standard specimens. The used materials were Gladstone fly ash, sand, 8 M sodium hydroxide solution, and D-grade sodium silicate. The weight ratio of sodium silicate to sodium hydroxide was 1, and activators to fly ash was 0.26. Mix 1, mix 2, and mix 3 contained 0%, 1% steel fibers, and 0.5% polypropylene fibers respectively. The structural buildability of layered samples and the influence of the layering process were assessed in terms of flexural strength through 3-point bending tests. Flexural strength results indicated that the layering process has negative impact on the mechanical strength of build-up materials. Also, mix 2 resulted in the highest flexural strength values in standard specimens and layered samples. However, the most bond separation issues between additive layers were achieved with layered samples produced with mix 2. Most layered samples produced with minimum time gaps recorded the highest flexural strength results.
Subfields: Automotive Engineering, Building and Construction, Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/e6c5321e6c566cd477e502bc9278d343618d36f5
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Citations in the corpus
- Fly Ash-Based Geopolymer Binder: A Future Construction Material (2018, background): “Layering processes in geopolymers result in an increase in flexural strength [25].”
- A review of 3D printed concrete: Performance requirements, testing measurements and mix design (2020, methodology): “7a, the interface bond strength generally decreases with an increase of the interval time [27,71,73,74], since microstructure is denser with smaller voids and pores inside with a decreased time gap [75,76].”