Bituminous concrete capable of self-healing fast under microwave action, manufacturing method and repairing method thereof

An asphalt concrete and self-healing technology, applied in the field of asphalt concrete, can solve the problems of slow speed, low uniformity and low efficiency of asphalt concrete, and achieve the effect of prolonging the service life and improving the maintenance efficiency.

Inactive Publication Date: 2015-11-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of slow speed, low uniformity and low efficiency of conventional asphalt concrete heated by microwaves, the present invention propo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0018] Using SMA-13 ​​gradation, the mass percentage of each raw material is: coarse and fine aggregates account for 83.1% (of which 9.5~16mm aggregates account for 33.7%, basalt; 4.75~9.5mm aggregates account for 34.2%, basalt; 2.36~ 4.75mm file aggregate accounts for 5.3%, limestone; 0~2.36mm accounts for 9.9%, limestone), limestone slag powder 2.3%, SBS modified asphalt 6.2%, soft magnetic ferrite powder 8.1%, fiber 0.3%; Heat the material to 185°C, heat the SBS asphalt to 180~185°C, turn on the stirring pot, add coarse and fine aggregates, fibers, and SBS modified asphalt successively, stir at 185°C for 90s, then add limestone mineral powder and soft magnetic ferrite powder , stirring for 180s, at 170~175°C, forming a large rutting plate, and cutting the rutting plate after standing for 24 hours to obtain a four-point bending beam for fatigue test; through the four-point bending fatigue test, at 15°C, 850 με The healing effect of trabeculae after microwave heating was tes...

Embodiment ２

[0020] To make asphalt mortar beams, the mass fraction of each raw material is: aggregate (0~4.75mm, limestone) accounts for 47.8%, limestone mineral powder 7.2%, soft ferrite powder 19.5%, SBS modified asphalt 25.5% ;Heat the aggregate to 185°C, heat the SBS asphalt to 180~185°C, turn on the stirring pot, add aggregate and asphalt successively, stir at 185°C for 90s, add limestone mineral powder and soft magnetic ferrite powder, and stir for 180s , under the condition of 170~175°C, the asphalt mortar beam mold was poured, and the static pressure method was used. After the specimen was cooled to room temperature for 5 hours, the asphalt mortar beam was obtained; the beam was placed in a temperature box at -10°C for 3 Hours, through the three-point bending test, the loading rate is 50mm / min, the trabecula is destroyed, microwave heating to 55 ° C, standing at room temperature for 3 hours, and then placed in a temperature box at -10 ° C for 3 hours, through three points The flex...

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Abstract

The invention relates to bituminous concrete capable of self-healing fast under microwave action, a manufacturing method and a repairing method thereof. The microwave self-healing bituminous concrete is prepared from, by mass, 83.8-88.3% of thick and thin aggregates, 2.3-7.9% of limestone mineral powder, 4.4-5.8% of bitumen, 2.1-8.5% of soft magnetic ferrite powder and 0-0.3% of fibers. Through stirring, the soft magnetic ferrite powder is evenly dispersed in bitumen mortar, the loss factor of the bituminous under microwaves is increased to over 0.16, when microwaves act on the damaged road surface made of the microwave self-healing bituminous concrete, soft magnetic ferrite has dielectric loss and magnetic loss effects on the microwaves, the bitumen mortar converts microwave electromagnetic energy into heat energy, the temperature of the bituminous concrete fast and evenly rises to 45 DEG C-85 DEG C after the bituminous concrete is heated for certain time, and fast self-healing of the bituminous concrete can be achieved by means of the heat repair function of the bitumen.

Description

technical field [0001] The invention relates to the field of road materials, in particular to an asphalt concrete mixed with soft ferrite and capable of rapid heating and self-healing under the action of microwaves, a preparation method and a repair method thereof. Background technique [0002] Asphalt concrete is a typical self-healing material. Under certain conditions, the micro-cracks inside it can be self-closed, so that the strength of the asphalt concrete structure can be restored. The self-healing ability of asphalt concrete is affected by many factors, among which the healing temperature has a greater impact on its self-healing. Microwave heating is an efficient heating method that can be used to heat asphalt concrete. However, in the asphalt concrete system, the stone and conventional mineral powder absorb heat to generate heat, rather than directly heating the asphalt micro-cracks, and the mineral composition inside the stone is different, so the heating rate is ...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B14/30
Inventor 朱兴一钟盛李峰
Owner TONGJI UNIV
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