Double-fiber fine-grain type asphalt mixture and preparation method thereof

A fine-grained asphalt and mixture technology, which is applied in the field of road engineering, can solve the problems of affecting the service life of asphalt pavement and large rutting deformation, and achieve obvious social and economic benefits, good mechanical properties, and excellent high temperature resistance.

CN106630770AActive Publication Date: 2017-05-10CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-10
Patent Text Reader

Abstract

The invention discloses a double-fiber fine-grain type asphalt mixture and a preparation method thereof. The asphalt-aggregate ratio of the asphalt mixture is 5.5 to 6.0 percent; asphalt is modified asphalt in which a non-amine anti-stripping agent accounting for 0.3 percent of the mass of the asphalt is doped; the nominal maximum particle size of aggregates is 13.2 mm; the passing rate of a screen hole of 4.75 mm is 25 to 30 percent, and the passing rate of a screen hole of 0.075 mm is 9 to 11 percent; the filler-bitumen ratio is 1.5 to 2.0; the porosity is 3 to 5 percent; the voids in the mineral aggregates is not less than 15 percent; the asphalt saturation rate is 65 to 80 percent; a fiber stabilizer is prepared from basalt fiber and lignin fiber; the basalt fiber is white flocculent basalt fiber, and the lignin fiber is gray granular lignin fiber; the fiber is automatically added into a blending pot through special fiber adding equipment. The double-fiber fine-grain type asphalt mixture disclosed by the invention is applicable to new construction and maintenance projects of expressways in southern high-temperature rainy districts in summer, and can effectively improve the resistance to rutting and water damage of an asphalt pavement and prolong the service life of the pavement.
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Description

technical field

[0001] The invention belongs to the technical field of road engineering, and relates to a double-fiber fine-grain asphalt mixture and a preparation method thereof. Background technique

[0002] Asphalt pavement has been widely used because of its good driving comfort and superior performance. More than 90% of expressways, first-class highways and urban roads use asphalt pavement. However, with the rapid development of social economy, the increasing number of heavy-duty vehicles in road transportation seriously affects the service life of asphalt pavement, especially the rutting deformation of asphalt pavement is generally large. Therefore, the research and development of high-performance asphalt mixture has become an important development direction for highway construction and maintenance.

[0003] At present, asphalt mixture with discontinuous gradation and dense skeleton structure is often used in highway asphalt pavement to reduce rutting deformation of a...

Examples

Embodiment Construction

[0017] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

[0018] Using a one-time blending method, using high-speed shearing equipment to prepare modified asphalt on-site with 4.4 mass parts of SBS (thermoplastic styrene-butadiene rubber) and 0.3 mass parts of AMR non-amine anti-stripping agent, the properties of the modified asphalt were tested. Tests show that the asphalt has a ductility of 36cm at 5°C, a softening point of 89°C, and a penetration value of 53 at 25°C (unit: 0.1mm). The amount of asphalt used in the double-fiber fine-grained asphalt mixture is 5.3%, the oil-stone ratio is 5.6%; the passing rates of aggregates 16.0, 13.2, 9.5, 4.75, 2.36, 1.18, 0.6, 0.3, 0.15, 0.075 (unit: mm) are 100, 90.5, 64.4, 27.1, 21.3, 15.9, 13.3, 12.0, 11.8, 10.6 (unit: %), cement (P.O42.5 ordinary Por...