Simple sample preparation method for testing drawing behavior of fibers in cement matrix

A fiber and matrix technology, applied in the field of characterization of building materials, can solve the problems of complex sample preparation, incompatibility of different types of fibers, and inability to ensure accurate embedding depth, etc., and achieve the goal of simple sample preparation, easy operation, and improved use efficiency Effect

Pending Publication Date: 2021-06-29
CHANGZHOU INST OF TECH
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Problems solved by technology

[0005] In order to solve the problems of complex sample preparation for testing the pulling behavior of fibers in the cement matrix in the prior art, the inability to ensure the accuracy of the

Method used

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  • Simple sample preparation method for testing drawing behavior of fibers in cement matrix

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Embodiment 1

[0026] A kind of simple and easy sample preparation method of test fiber pulling behavior in cement matrix comprises the steps: the fiber used in the present embodiment is sisal fiber, and the porous elastic material that uses is the thick sponge of 3cm; Namely mark point-5 to The distance L1 between the mark points 2 and 6 is 3cm; the depth L2 that the sisal fiber is inserted in the mortar is set to be 2cm;

[0027] (1) The sisal fiber 1 is cut to 10cm, and then the two ends are clamped and straightened with clips. After straightening, three mark points are successively set on the sisal fiber 1, namely mark point one 5 and mark point two 6 and mark point three 7; such as figure 1 as shown in (a);

[0028] (2) Utilize a thin needle to pass the sisal fiber 1 vertically through the porous elastic material (sponge) 2 with a thickness of 3 cm, and wear 10 sisal fibers 1 on each sponge 2, and make the marking points set on it One 5 and mark point two 6 are respectively flat with ...

Embodiment 2

[0034] A kind of simple and easy sample preparation method of test fiber pulling behavior in cement matrix, comprises the steps: the fiber used in the present embodiment is sisal fiber, and the porous elastic material that uses is the thick sponge of 2cm; Namely mark point-5 to The distance L1 between the mark points 2 and 6 is 2cm; the depth L2 that the sisal fiber is inserted in the mortar is set to be 1cm;

[0035] (1) The sisal fiber 1 is cut to 5cm, and then the two ends are clamped and straightened with clips. After straightening, three mark points are successively set on the sisal fiber 1, namely mark point one 5 and mark point two 6 and mark point three 7;

[0036] (2) Utilize a thin needle to pass the sisal fiber 1 vertically through the porous elastic material (sponge) 2 with a thickness of 2cm, and wear 10 sisal fibers 1 on each sponge 2, and make the marking points set on it The first 5 and the second mark 6 are respectively flat with the two sides of the sponge 2...

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Abstract

The invention discloses a simple sample preparation method for testing the drawing behavior of fibers in a cement matrix. The method comprises the following steps: (1) cutting the fibers to a fixed length, then straightening and setting three mark points; (2) enabling the fibers to vertically penetrate through an elastic material, and enabling the two mark points on the fiber to be flush with the two side surfaces of the elastic material respectively; (3) cutting off redundant fibers exposed outside the elastic material along one side surface of the elastic material, and leaving the remaining mark point outside the elastic material; (4) pouring the stirred cement mortar into a mold, vibrating out bubbles, and smoothing the surface of poured mortar; (5) covering the mold with the elastic material, enabling ends of the fibers to be just in contact with the mortar, downwards inserting the fibers into the mortar, and enabling the mark point originally left outside to be flush with the adjacent side surface of the elastic material, so as to complete embedding of the fibers into the mortar; and (6) after standard curing to a specific age, carrying out a fiber pull-out test on a tension tester.

Description

technical field [0001] The invention relates to the technical field of characterization of building materials, in particular to a simple sample preparation method for testing the pulling behavior of fibers in a cement matrix. Background technique [0002] Cement-based materials are currently the most used building materials in the world, but they are brittle and easy to crack. Studies have shown that fiber has a good control effect on the cracking of cement-based materials. The fibers used in cement-based materials mainly include: steel fibers, carbon fibers, glass fibers, synthetic fibers, etc. The toughening and anti-cracking effect of fiber is not only related to its own tensile strength, but also depends on the bonding strength of the interface between fiber and cement matrix. Many researchers have pretreated the fiber to improve its bonding performance with the cement matrix. [0003] Before using pretreated fibers in concrete projects, the interfacial bonding behavi...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01N3/08
CPCG01N1/286G01N1/36G01N3/08G01N2001/366G01N2203/0017
Inventor 梁贺李杰李昀珊张伊佳杨刘赵丽
Owner CHANGZHOU INST OF TECH
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