Method for testing bendability and extensibility of 3D printing cement-based material

Abstract

The invention discloses a method for testing the bendability and extensibility of a 3D printing cement-based material. The method comprises the following steps: step 1, testing the bendability of thecement-based material; wherein an extrusion device extrudes the cement-based material printing strip on a workbench according to a specified broken line path or a curve path, the broken line corner value of the broken line-shaped printing strip is gradually reduced in a gradient manner along with the increase of the detection times, and the broken line corner value of the printing strip when cracks occur at the broken line corner is recorded; the curvature value of the curve corner of the curve-shaped printing strip is gradually increased in a gradient manner along with the increase of the detection times, and the curvature value of the printing strip when the curve corner is cracked is recorded; step 2, comparing the bendability of the cement-based material; and step 3, testing the extensibility of the cement-based material. The method detects and evaluates the printing capability of the 3D printing cement-based material with an inclination or extensibility structure, is helpful to quantify the printing performance of the printing material, and has a guiding effect on the preparation of the 3D printing cement-based material.

Description

technical field [0001] The invention belongs to the technical field of architectural 3D printing, and in particular relates to a method for testing the bending and stretching properties of 3D printing cement-based materials. Background technique [0002] In recent years, architectural 3D printing technology has begun to develop. Architectural 3D printing technology is an interdisciplinary digital construction technology. The requirements for building materials are different from those in the past. The materials used for architectural 3D printing are mainly cement-based materials. With the changes in performance requirements for cement-based materials and different application scenarios, relevant testing methods for materials also need to be updated and supplemented. In this regard, scholars at home and abroad have carried out a lot of research work, and have formulated or are formulating some performance testing standards for 3D printing cement-based materials. , the accumu...

AI Technical Summary

Problems solved by technology

[0003] If the preparation of 3D printing cement-based materials is unreasonable, cracks will easily appear at the printing corners, which will affect the printing quality. However, there is no relevant testing method or standard for this material quality problem; architectural 3D printing technology can already print a certain slope. structure, but there is currently no testing method or standard for whether cement-based materials are suitable for printing inclined structures or protruding structures, and it is impossible to judge whether cement-based materials are suitable for printing inclined structures or protruding structures

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