Abstract
During underground ore mining, the cementitious backfill composites (CBC) is used as an artificially constructed roof to safeguard workers and equipment. This poses a significant challenge to the flexural performance of the CBC. The aim of this paper is to improve the bending properties of CBC using a 3D printed polymer lattice (3D-PPL). We prepared nine different 3D-PPL reinforced CBC. Three different structural units were designed for 3D-PPL. Each structure of the 3D-PPL was prepared using 3 different materials. The flexural behavior of 3D-PPL reinforced CBC was investigated by three-point bending tests, digital image correlation (DIC) tomography and x-ray computed tomography (CT). The results show that non-3D-PPL (N-3D-PPL) reinforced CBC is brittle after reaching the ultimate load-carrying capacity and 3D-PPL-reinforced CBC is ductile. OR-3D-PPL is optimal for CBC ductility enhancement with about 136–413 times higher total work in comparison to N-3D-PPL. 3D-PPL can convert CBC from single to multi-crack cracking. The Cube structure is more advantageous for CBC to achieve multi-crack cracking. Cracks in the 3D-PPL reinforced CBC samples were mainly tensile and shear cracks. This work shows that 3D-PPL has great potential to improve the bending performance of CBC and offers a new approach to improving the bending performance of CBC.
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