Testing method for cohesion performance of 3D printing building mortar

Abstract

The invention relates to a testing method for cohesion performance of 3D printing building mortar. The method comprises the two steps of preparation of a test specimen and testing of voidage, wherein the testing of voidage comprises the steps of determination of drying quality, dipping of the test specimen, determination of apparent mass of a saturated specimen, quality determination of the saturated specimen, voidage calculation and the like. Compared with the prior art, the method provided by the invention can be used for effectively representing the layer cohesion performance (voidage) of different kinds of printing mortar, i.e., while the voidage is lowered, the compactness is increased, and thus less defects exist between each two adjacent layers. According to the method, the quantitative index to the layer cohesion performance of the 3D printing mortar can be given so as to provide a basis for evaluating the performance of the 3D printing material. By testing the layer cohesion performance of the printing material via the method, the compositions of the material can be blended, so that the requirements on the performance of the printing material in different environments and under different working conditions can be met.

Description

technical field [0001] The invention belongs to the technical field of building materials and building construction, and in particular relates to a method for testing the connection performance of 3D printing building mortar. Background technique [0002] 3D printing technology is also called rapid prototyping technology and additive manufacturing technology. The principle is to decompose the three-dimensional model designed by the computer into several layers of plane slices, and then the 3D printer superimposes the printing materials layer by layer according to the slice graphics, and finally accumulates them into a complete object. . The most prominent advantage of 3D printing technology is that it can directly generate parts of any shape from computer graphics data without machining or any molds, thereby greatly shortening the product development cycle, improving productivity and reducing production costs. Compared with traditional technology, 3D printing technology als...

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Problems solved by technology

[0005] At present, the test methods commonly used in the mechanical properties and durability of building materials, such as compressive strength, flexural strength, shrinkage, expansion test, impermeability test, etc., are not suitable for characterizing the connection performance of 3D printing materials. There is no such method at home and abroad. It can be used as a reference for testing and characterization methods for the connection of 3D printing building material layers. The test method for the connection performance of 3D printing building material layers proposed by the present invention can make up for the gaps in the existing technology and provide a good technical basis for the development of 3D printing buildings.

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