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A low-temperature hydraulic asphalt and a method for detecting the freeze-off temperature of its substitute mixture

A low-temperature, hydraulic technology, applied to building thermal insulation materials, using stable tension/pressure to test the strength of materials, building components, etc., can solve the problems of low test accuracy, easy to generate eccentric force, single function, etc. Cost, saving detection time, simple and effective detection method

Active Publication Date: 2015-08-12
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the current method of testing the low-temperature freeze-off temperature of asphalt mixture is to use asphalt mixture low-temperature freeze-off experimental equipment. Similar equipment at home and abroad generally have shortcomings such as low test accuracy, easy to generate eccentric force, cumbersome operation, and single function.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weighing by weight: 70.5 parts of heavy traffic asphalt produced by CNOOC SZ36-1 crude oil; 12.69 parts of rubber powder; 3.88 parts of 791-H SBS modifier of Yueyang Petrochemical; 12.69 parts of oil extracted from the third line of CNOOC; The company produces 0.25 copies of stabilizer.

[0020] The preparation method is as follows: First, melt and mix the heavy traffic asphalt and the compatibilizer minus the three-line extraction oil, then heat to 185-190°C, then add rubber powder into the asphalt and shear for 2 hours, then add SBS modifier into the asphalt to shear After 2 hours, the stabilizer was slowly added to the asphalt and sheared for 15 minutes at a shear rate of 3000r / h. Finally, the sheared asphalt was uniformly stirred for 12 hours under the conditions of 900 r / min and 175° C. to obtain low-temperature hydraulic asphalt.

[0021] According to the T0627-2011 asphalt flexural creep stiffness test (bending beam rheometer method) in the JTG E20-2011 highway ...

Embodiment 2

[0023] Weighing by weight: 65.64 parts of heavy traffic asphalt produced by CNOOC SZ36-1 crude oil; 13.13 parts of rubber powder; 3.94 parts of 791-H SBS modifier of Yueyang Petrochemical; 17.07 parts of oil extracted from the third line of CNOOC; The company produces 0.23 copies of stabilizer. The preparation method is the same as in Example 1.

[0024] According to the T0627-2011 asphalt flexural creep stiffness test (bending beam rheometer method) in the JTG E20-2011 highway engineering asphalt and asphalt mixture test regulations, the BBR value of hydraulic asphalt samples was tested.

Embodiment 3

[0026] Weighing by weight: 60.44 parts of heavy traffic asphalt produced by CNOOC SZ36-1 crude oil; 6.04 parts of rubber powder; 7.86 parts of 791-H SBS modifier of Yueyang Petrochemical Company; The company produces 0.27 copies of stabilizer. The preparation method is the same as in Example 1.

[0027] According to the T0627-2011 asphalt flexural creep stiffness test (bending beam rheometer method) in the JTG E20-2011 highway engineering asphalt and asphalt mixture test regulations, the BBR value of hydraulic asphalt samples was tested.

[0028] The heavy traffic asphalt selected in the above examples meets the technical requirements for road petroleum asphalt in JTGF40-2004.

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Abstract

The invention discloses low-temperature hydraulic asphalt. The low-temperature hydraulic asphalt comprises the following components in parts by weight: 60-75 parts of heavy duty asphalt, 5-15 parts of rubber powder, 3.8-10 parts of SBS modifier, 12-26 parts of compatilizer, and 0.2-0.3 parts of stabilizer. According to the low-temperature hydraulic asphalt, a softening point is larger than 70 DEG C, the ductility of 5 DEG C is larger than 55cm, the needle penetration degree is larger than 1000, the brittle point is lower than 25 under zero DEG C, and the low-temperature cracking temperature of a mixture of the hydraulic asphalt is over 45 under zero DEG C; and the low-temperature hydraulic asphalt can meet special requirements of alpine regions on the hydraulic asphalt. The invention further discloses a method for detecting the cracking temperature of a mixture replacing the low-temperature hydraulic asphalt, by inspecting a test result of a bent beam rheometer of low-temperature hydraulic asphalt samples, the low-temperature cracking temperature of the mixture of an asphalt sample is characterized; and the method disclosed by the invention is simple and efficient, can save the detection time and a large amount of labors and materials, and reduce the cost.

Description

technical field [0001] The invention relates to a low-temperature hydraulic asphalt, and at the same time, the invention also relates to a method for detecting the freeze-off temperature of a substitute low-temperature hydraulic asphalt mixture. Background technique [0002] Hydraulic asphalt concrete is a viscoelastic material, which is superior to cement concrete in terms of plasticity, flexibility, joint treatment, ability to adapt to deformation, and maintenance. Therefore, in addition to being used for roads and roofs, asphalt is also widely used in water conservancy projects such as dams, coastal berms, channel seepage prevention, and reservoirs. [0003] In recent years, due to the needs of environmental protection and the optimization of power industry systems, the construction of hydraulic asphalt concrete anti-seepage projects is on the rise, and has been used in large-scale water conservancy projects represented by the Three Gorges, Nierji and other water conserva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L21/00C08L53/02C08L91/00G01N3/18
Inventor 裴晓光李福起孟繁梅陈松姚秀杰徐萌卢德庆李虎
Owner CHINA NAT OFFSHORE OIL CORP