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Test method for in-situ characterization of anisotropy of 3D printing concrete

An anisotropic, 3D printing technology, used in the preparation of test samples, the use of repetitive force/pulsation force testing material strength, measurement devices, etc. Quickly obtain test results, difficult processing of test blocks, etc., to achieve the effect of versatility and operability, easy to popularize and use, and simple structure

Pending Publication Date: 2022-03-04
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

These methods have long cycles, complex equipment, difficult processing of test blocks, high cost, and cannot obtain test results in real time and quickly, and the results can only reflect the average mechanical properties. Difficulties

Method used

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  • Test method for in-situ characterization of anisotropy of 3D printing concrete
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  • Test method for in-situ characterization of anisotropy of 3D printing concrete

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0034] Test method for primary characterization 3D printing concrete anisotropy

[0035] Route 1: Get a 3D print concrete penetration depth of a C30 intensity level - compressive strength regression curve

[0036] (1) Set the print nozzle diameter of 40mm, set the base speed of 0.75m 3 / h, horizontal printing speed is 10m / min, printing, intensity grade C30 same condition test block, print specifications (160-190) mm × (160-190) mm × (160-190) mm, natural maintenance 56 Day, and record the environmental temperature and humidity conditions. Take 27 pieces of test blocks.

[0037] (2) After reaching the raging age, cutting and processing using high-precision processing machines, cutting the same condition test block into such as figure 2 A standard cube test block showing 150 mm × 150 mm × 150 mm.

[0038] (3) According to the direction of printing...

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Abstract

The invention discloses an in-situ test method for quantitatively characterizing the anisotropy of 3D printing concrete by testing the penetration depth, a same-condition test piece calibration method is established, the penetration depth is converted into compressive strength, and the in-situ quantitative characterization of the strength anisotropy of the 3D printing concrete is realized. The method is characterized in that the power source value is adjusted by taking the reliability and the distinction degree of the calibration result as evaluation indexes, and the precision of the test method is improved on the basis of realizing the anisotropic in-situ test of the 3D printing concrete. According to the method, the penetration depth serves as the anisotropy evaluation basis, the 3D printing concrete does not need to be cut, the influence caused by cutting machining in the anisotropy evaluation process is reduced, the 3D printing concrete can be repeatedly tested and analyzed point by point, layer by layer and at different times, and the testing accuracy is improved. Distribution results of the 3D printing concrete strength in time and space are obtained, and a practical and reliable scientific method is provided for related material research and engineering entity quality detection.

Description

Technical field [0001] The present invention belongs to the field of civil engineering and materials, and more particularly to a test method for the anisotropy of 3D printing concrete. Background technique [0002] Concrete is one of the most widely used civil engineering materials today. Combining 3D printing techniques with concrete technology, it is used in the construction sector to achieve maximum shortening construction period, reduce costs and saving human resources, and can reduce waste generation. At the same time, it helps to create more refined products, improve the innovation capabilities in my country's architectural field, and promote the development of my country's economy. [0003] 3D printing concrete mechanics is the basis and key of structural security and engineering applications. 3D Print Concrete Mechanical Properties The main reason for which has an anisotropy, causing 3D printing concrete to have an anisotropy to be divided into material reasons and printe...

Claims

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Application Information

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IPC IPC(8): G01N3/34G01N3/02G01N1/28
CPCG01N3/34G01N3/02G01N1/286G01N2203/0005G01N2203/001G01N2203/0035G01N2203/0258G01N2203/0298G01N2203/0218G01N2203/0682G01N2203/0075
Inventor 陈春傅琦张亚梅刘超王香港
Owner SOUTHEAST UNIV
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