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Tensile and shear test method for fiber-reinforced asphalt mortar perforated plate strip

A fiber reinforced, shear test technology, applied in the application of stable shear force to test material strength, strength properties, preparation of test samples, etc. and other problems to achieve the effect of improving crack resistance

Pending Publication Date: 2022-03-25
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars use the direct tensile test to study the crack resistance of fiber asphalt mortar, but the cracking position of the direct tensile test is relatively random, and the test results are highly discrete, which has a certain impact on the result analysis.

Method used

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  • Tensile and shear test method for fiber-reinforced asphalt mortar perforated plate strip
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  • Tensile and shear test method for fiber-reinforced asphalt mortar perforated plate strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this example, no fiber is added, and a test piece is prepared by using 50% mineral powder and 50% SBS modified asphalt. When loading, use straight-pull type I loading, select the No. 2 hole of the upper block 13, and the No. 8 hole of the lower block 18 to connect with the connecting block. The test results are shown in Table 1-Table 2.

Embodiment 2

[0046] In this example, 49% mineral powder, 49% SBS modified asphalt and 2% basalt fiber are used to prepare the test piece. When loading, use straight-pull type I loading, select the No. 2 hole of the upper block 13, and the No. 8 hole of the lower block 18 to connect with the connecting block. The test results are shown in Table 1-Table 2.

[0047] Table 1 Characteristic parameters of force-displacement curve

[0048]

[0049] Table 2 Calculation results of test data

[0050]

[0051] It can be seen from the table that the fracture energy, flexibility index and critical stress intensity factor of the asphalt mortar increase significantly after adding basalt fiber, so the enhancement effect of basalt fiber on the crack resistance of asphalt mortar is remarkable.

[0052] This test method provides a simple and feasible direct tensile test method for fiber asphalt mortar. The designed mold can cause stress concentration in the middle position of the specimen, and can ac...

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Abstract

The invention discloses a stretching and shearing test method for a fiber-reinforced asphalt mortar perforated plate strip. The stretching and shearing test method comprises the following steps: arranging a splayed mold; preparing and forming a perforated plate strip tensile test piece; demolding the test piece; mounting and loading a test piece; and analyzing a test result. According to the present invention, the mold for molding the fiber asphalt mortar porous plate strip tensile test piece is provided, the universal material testing machine UTM is adopted to perform stretching and shear loading so as to achieve cracking in various different modes, and the indexes such as the ultimate load, the fracture energy, the stress intensity factor and the like are adopted to analyze the test result; the test method can be used for researching the enhancement effect of the fiber on the crack resistance and shear failure resistance of the asphalt mortar, and provides a reference for the optimization design of a fiber asphalt mixture, so that the crack resistance of an asphalt pavement is improved.

Description

technical field [0001] The invention relates to a tensile and shearing test method for a fiber-reinforced asphalt mortar perforated strip, belonging to the technical field of road engineering. Background technique [0002] In recent years, my country has continuously increased investment in infrastructure construction, and the requirements for pavement materials have become increasingly stringent. Asphalt pavement is widely used in road construction, so the crack resistance of asphalt mixture is also paid attention to. As a component of asphalt mixture, asphalt mortar has a great influence on the performance of asphalt mixture, and the crack resistance of the two is closely related. As a new type of material, fiber can improve the low-temperature crack resistance of asphalt mortar and asphalt mixture. Some scholars use direct tensile test to study the crack resistance of fiber asphalt mortar, but the cracking position of direct tensile test is relatively random, and the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/36G01N3/02G01N3/18G01N3/24
CPCG01N1/36G01N3/18G01N3/24G01N3/02G01N2001/366G01N2203/0003G01N2203/0017G01N2203/0025G01N2203/0067G01N2203/0075G01N2203/0228G01N2203/0676G01N2203/0682
Inventor 张垚顾倩俪康爱红肖鹏娄可可
Owner YANGZHOU UNIV
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