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Method for measuring shear deformation resistance of sand grain type mixture

A mixture and anti-shear technology, which is applied in the direction of applying stable shear force to test the strength of materials, preparation of test samples, and measurement devices, etc., can solve the problem of expensive dynamic mechanical performance testing machines and inability to evaluate elastic recovery ability , There is no problem of sand-grain mixture resistance to deformation and recovery ability

Pending Publication Date: 2022-04-01
厦门华特公路沥青技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anti-shear deformation ability of materials is mainly used to evaluate the high-temperature shear deformation ability of modified asphalt, and the evaluation method of anti-deformation and recovery ability of sand-type mixtures has not been seen; the experimental equipment rutting tester can test the mixture However, it is impossible to evaluate the elastic recovery ability; while the common mechanical performance testing machine is mainly used for compressive and tensile properties, and the dynamic mechanical performance testing machine is expensive, so it is necessary to use the asphalt binder testing instrument to develop a convenient Determination method of anti-shear deformation ability of sand-grain mixture to evaluate high-temperature deformation and elastic recovery ability of sand-grain mixture

Method used

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  • Method for measuring shear deformation resistance of sand grain type mixture
  • Method for measuring shear deformation resistance of sand grain type mixture
  • Method for measuring shear deformation resistance of sand grain type mixture

Examples

Experimental program
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Embodiment 1

[0031] A method for measuring the shear deformation resistance of a sand-grain mixture, comprising the steps of:

[0032] The maximum particle size of the sand-type mixture is 4.75mm. The composition of the mixture is as follows in terms of mass percentage: 100% aggregate, 8% mineral powder, and 10% asphalt. The grades of the aggregate are as follows:

[0033] Sieve hole(mm) 4.75～23.6 2.36～1.18 1.18～0.6 0.6～0.3 0.3～0.15 0.15～0.075 0.075 and below Mass percentage (%) 30.9 19.8 17.4 12.1 4.7 15.1 10.9

[0034] S1. Put 300-500g of sand-grain mixture and the mold in an oven to keep warm and heat to 160-170°C. The mold includes a base, a sleeve, a pressure head and a demoulding rod, and the base is suitable for being installed on the bottom of the sleeve. A cavity is formed in the sleeve, and the indenter and the demoulding rod are suitable for inserting into the sleeve; the inner diameter of the sleeve is 25mm, the outer diameter is 50mm, and the ...

Embodiment 2

[0047] A method for measuring the shear deformation resistance of a sand-grain mixture, comprising the steps of:

[0048] The maximum particle size of the sand-type mixture is 2.36mm, and the composition of the mixture is as follows in terms of mass percentage:

[0049] Aggregate 100%, mineral powder 7.3%, asphalt 9.1%;

[0050] Part A aggregate 100%, PO425 cement 1%, BCR modified emulsified asphalt 13.28%, sufficient water into the mixing container for mixing until demulsification;

[0051] Part B aggregate 100%, PO425 cement 1%, 0.2% polyester fiber, BCR modified emulsified asphalt 13.28%, and sufficient water are put into a mixing container for mixing until demulsification; the grades of the aggregate are as follows:

[0052] Sieve hole(mm) 2.36～0.6 0.6～0.3 0.3～0.075 0.075 and below Mass percentage (%) 25 40 15 20

[0053] S1. Put 300-500g of sand-grain mixture and the mold in an oven to keep warm and heat to 150-160°C. The mold includes a base...

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Abstract

The invention provides a method for measuring the shear deformation resistance of a sand grain type mixture, which comprises the following steps: preheating the sand grain type mixture and a mold to 150-170 DEG C, the mold comprising a base, a sleeve, a pressure head and a demolding rod; according to the density of the mixture, weighing the mixture according to the weight of the mixture by taking 2.5-3 times of the maximum particle size as a target height; the mixture is poured into the containing cavity to be tamped, and then the pressing head is inserted into the sleeve; connecting an air pressure device or a universal press machine with a pressure head so as to perform pressure forming on the mixture in the accommodating cavity, wherein at least five test pieces are formed in each test piece; placing the mold filled with the test piece at 5-15 DEG C, dismounting the base, and inserting a demolding rod into the sleeve to demold the test piece; and carrying out an anti-shear deformation capability experiment on the demolded test piece in a dynamic shear rheometer. Therefore, the shear deformation resistance of the mixture can be evaluated simply, visually and reliably.

Description

technical field [0001] The invention relates to the technical field of mixture testing, in particular to a method for measuring the shear deformation resistance of sand-type mixtures. Background technique [0002] For grit-type mixtures, there is a lack of methods to measure the shear deformation capacity to judge the data suitable for pavement mixture application. For example, the sand-grain mixture of the stress-absorbing layer is paved between the semi-rigid base and the asphalt pavement or between the cement concrete pavement and the asphalt pavement. It is a modified asphalt layer with high deformation and recovery capabilities, which can absorb the stress concentration in the crack. , prevent reflection cracks from forming on asphalt pavement, have the characteristics of strengthening interlayer bonding and waterproofing, and prolonging the service life of pavement. At present, the anti-shear deformation ability of materials is mainly used to evaluate the high-tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/02G01N3/24
Inventor 蔡智慧马云容黄睿孟龑胥亮郭文祥吴清芳
Owner 厦门华特公路沥青技术有限公司
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