Test method for bonding strength of chopped ultrafine organic fiber and cement-based composite interface

A technology of organic fiber and interface bonding, which is applied in the direction of analysis materials, preparation of test samples, and measurement devices, can solve problems such as difficult operation, inability to freely adjust the verticality of the main axis of the fiber, and large dispersion of test results, so as to avoid The effects of damage, accurate test results, and simple preparation

Active Publication Date: 2015-07-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fiber embedding technology and the preparation method of the specimen have a great influence on the test results of the interface bond strength between the fiber and the cement-based matrix.
[0003] At present, the authorized invention patent (Patent No. 201110404137.X) proposes to use a pneumatic clamping device to fix the free ends of organic fibers, but this method is only suitable for the effective clamping of organic fibers with a diameter greater than 39 μm, and cannot reliably clamp the organic fibers with a diameter of Ultrafine chopped organic f

Method used

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  • Test method for bonding strength of chopped ultrafine organic fiber and cement-based composite interface
  • Test method for bonding strength of chopped ultrafine organic fiber and cement-based composite interface
  • Test method for bonding strength of chopped ultrafine organic fiber and cement-based composite interface

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Example of testing the interface bond strength between polyvinyl alcohol fiber and cement-based composite material.

[0040] The raw materials include polyvinyl alcohol fibers (12 mm in length and 39 μm in diameter), ordinary Portland cement, water, sample-carrying cuboid, hollow cuboid mold, double-sided adhesive, and quick-drying adhesive.

[0041] The sample preparation process is as follows:

[0042] 1. Paste the polyvinyl alcohol fiber on the 10mm×5mm×2mm sample loading cuboid with double-sided tape, and the fiber length exposed at the lower end is 1.5mm.

[0043] 2. Prepare a cuboid mold for forming the cement matrix. The mold size is 30mm×10mm×5mm. Pour the evenly stirred cement-based material (ordinary Portland cement and water in a mass ratio of 3:1) into the mold, and vibrate until the surface Smooth out to obtain a cement matrix.

[0044] 3. Insert the exposed end of the fiber pasted on the sample-loading cuboid in step 1 vertically into the ceme...

Embodiment 2

[0049] Example 2: Example of testing the interface bond strength between cellulose fiber and cement-based composite material.

[0050] Raw materials include cellulose fibers (3 mm in length and 15 μm in diameter), ordinary Portland cement, water, fiber-loaded cuboid, hollow cuboid mold, double-sided adhesive, and quick-drying adhesive.

[0051] The sample preparation process is as follows:

[0052] 1. Use double-sided tape to paste the cellulose fiber on the 10mm×5mm×2mm sample loading cuboid, and the fiber length exposed at the lower end is 1.0mm.

[0053] 2. Prepare a cuboid mold for forming the cement matrix. The mold size is 30mm×10mm×5mm. Pour the evenly stirred cement-based material (ordinary Portland cement and water in a mass ratio of 3:1) into the mold, and vibrate until the surface Smooth out to obtain a cement matrix.

[0054] 3. Insert the exposed end of the fiber pasted on the sample-loading cuboid in step 1 vertically into the cement matrix in step 2, and place t...

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Abstract

The invention discloses a test method for bonding strength of chopped ultrafine organic fiber and a cement-based composite interface. The method comprises steps as follows: fiber is bonded on a sample loading cuboid, and a part of the lower end of the fiber is exposed; a mold is prepared, uniformly stirred cement-based materials are poured into the mold and compacted, the surface is flattened, and a cement matrix is obtained; the exposed end of the fiber is perpendicularly inserted into the cement matrix; after the cement matrix is cured to a test age, the sample loading cuboid is removed, and a free end of the fiber is exposed; an instant adhesive is bonded to the free end of the fiber and is congealed to form small balls; the fiber is tested on a monofilament stretching machine, the stretching speed is controlled, the fiber is pulled out of the cement matrix, and a load displacement curve is obtained; the bonding strength of the fiber and the cement-based composite interface is calculated. The exposed length of the fiber is controlled in advance, and the embedded length of the fiber in the cement matrix can be controlled precisely; requirements for the length and the diameter of the fiber are low, and the test method can be used for testing longer and thinner fiber; a tested sample is not required to be cut, and the testing result is more accurate.

Description

technical field [0001] The invention relates to the technical field of cement-based composite materials, in particular to a method for testing the interface bond strength between chopped ultrafine organic fibers and cement-based composite materials. Background technique [0002] Organic fibers mainly include synthetic high-performance fibers such as polyethylene fibers, polyvinyl alcohol fibers, polypropylene fibers, and polyester fibers, as well as natural organic fibers such as cellulose fibers. They can be used to prepare high-performance cement-based composite materials and improve cement-based composite materials. Mechanical properties and durability of materials. The interfacial bonding strength between fiber and cement matrix plays a particularly important role in fiber reinforced cement-based composites, and it is a bridge for the stress transmission of the entire composite. Appropriate interfacial bonding strength can make the performance of cement-based composites...

Claims

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Application Information

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IPC IPC(8): G01N19/04G01N1/28
Inventor 郭丽萍谌正凯杨亚男
Owner SOUTHEAST UNIV
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