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Phase change thermoregulation cement pitch composition concrete and preparation method thereof

A technology for asphalt concrete and cement asphalt, which is applied in the field of phase-change temperature-regulating cement-asphalt composite concrete and its preparation, can solve problems such as poor high-temperature stability of phase-change pavement materials, and achieves alleviation of urban heat island effect, simple process, and reduced The effect of road temperature

Active Publication Date: 2012-06-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 200710090229.9 "A self-regulating road phase change material and its production method" mentioned the use of PCM to store and release solar energy and regulate the temperature of the road surface, so as to avoid the hidden danger of frost on the road surface in winter and cracks caused by freezing, and improve road driving safety, but No specific asphalt pavement
Chinese patent CN200810048628.3 "a preparation method of phase change asphalt pavement material" proposes to prepare phase change asphalt pavement material by phase change material, coagulant, support material, coupling agent, aggregate, filler, fiber and asphalt, It is characterized in that the phase change material is added to the asphalt to prepare the phase change modified asphalt, and the phase change modified asphalt is used in the hot mix asphalt mixture to prepare the phase change pavement material, but the high temperature stability of the phase change pavement material not good
But this method is based on microsurfacing technology, which is different from the technical route adopted in the present invention

Method used

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  • Phase change thermoregulation cement pitch composition concrete and preparation method thereof
  • Phase change thermoregulation cement pitch composition concrete and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The phase-change temperature-adjusted cement-asphalt composite concrete is composed of large-pore asphalt concrete and cement mortar mixed with phase-change materials. In the large-pore concrete, the weight percentage of each raw material is: aggregate 88%, mineral powder 7%, modified 5% permanent asphalt; in the cement mortar, the weight percentage of each raw material is cement 40%, fine sand 20%, fly ash 7%, water 27%, expansion agent 0.7%, composite phase change material 5%, water reducing Agent 0.3%;

[0030] The crushing value of the aggregate is 10%, the needle flake content is 3%, and the gradation is shown in Table 1;

[0031] The slag powder is limestone slag powder, and meets the technical requirements for fillers in the "Technical Specifications for Construction of Highway Asphalt Pavement";

[0032] The modified asphalt is a high-viscosity TPS modified asphalt, and its viscosity at 60°C is 90,000 Pa.s;

[0033] The fine sand is river sand with a particle ...

Embodiment 2

[0043] Phase-change temperature-adjusted cement-asphalt composite concrete is composed of large-pore asphalt concrete and cement mortar mixed with phase-change materials. In large-pore concrete, the weight percentages of each raw material are: aggregate 90%, mineral powder 5.5%, modified 4.5% permanent asphalt; in the cement mortar, the weight percentage of each raw material is cement 42%, fine sand 17%, fly ash 6%, water 28%, expansion agent 0.7%, composite phase change material 6%, water reducing Agent 0.3%;

[0044] The crushing value of the aggregate is 10%, the needle flake content is 3%, and the gradation is shown in Table 1;

[0045] The modified asphalt is a high-viscosity TPS modified asphalt, and its viscosity at 60°C is 90,000 Pa.s;

[0046] The fine sand is river sand with a particle size of ≤0.6mm;

[0047] The fly ash is Class II fly ash, particle size ≤ 0.6mm;

[0048] Described expansion agent is UEA expansion agent;

[0049] The composite phase change mate...

Embodiment 3

[0056] The phase-change temperature-adjusted cement-asphalt composite concrete is composed of large-pore asphalt concrete and cement mortar mixed with phase-change materials. In the large-pore concrete, the weight percentage of each raw material is: aggregate 91%, mineral powder 5%, modified 4% permanent asphalt; in cement mortar, the weight percentage of each raw material is cement 43%, fine sand 15%, fly ash 5%, water 29%, expansion agent 0.6%, composite phase change material 7%, water reducing Agent 0.4%;

[0057] The crushing value of the aggregate is 10%, the needle flake content is 3%, and the gradation is shown in Table 1;

[0058] The modified asphalt is a high-viscosity TPS modified asphalt, and its viscosity at 60°C is 90,000 Pa.s;

[0059] The fine sand is river sand with a particle size of ≤0.6mm;

[0060] The fly ash is Class II fly ash, particle size ≤ 0.6mm;

[0061] Described expansion agent is UEA expansion agent;

[0062] The composite phase change materi...

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Abstract

The invention relates to phase change thermoregulation cement pitch composition concrete and a preparation method thereof. Cement mucilage mixed with phase change materials is filled into pitch concrete with big pores in self-leveling mode so as to guarantee that the pores are fully filled. Components of the pitch concrete with the big pores include: 88-90% of aggregate, 5-7% of mineral powder and 4-5% of modified pitch, wherein porosity of the pitch concrete ranges from 20% to 30%. Components of the cement mucilage mixed with the phase change materials include: 40-45% of cement, 15-20% of fine sand, 5-7% of coal ash, 25-30% of water, 0.6-1.5% of swelling agent, 5-10% of composite phase change materials and 0.3-0.5% of water reducer. The phase change thermoregulation cement pitch composition concrete and the preparation method of the phase change thermoregulation cement pitch composition concrete have the advantages of being simple in technology, low in cost, easy to implement and capable of enabling road surfaces to have strong capacity of resisting tracks, simultaneously having a function of lowering temperature of the road surfaces, and avoiding thermal damage on the phase change materials during a high temperature mixing and paving process in the traditional hot-mixed pitch concrete.

Description

technical field [0001] The invention belongs to the technical field of high-performance pavement materials, in particular to a phase-change temperature-regulating cement-asphalt composite concrete and a preparation method thereof. Background technique [0002] Due to the advantages of high flatness, low noise, and comfortable driving, asphalt pavement has been more and more used in high-grade pavement. Asphalt is a typical viscoelastic material, which determines that the performance of asphalt pavement is easily affected by load and temperature. At the same time, asphalt is a kind of heat-absorbing material, and the absorption rate of solar heat radiation is as high as 0.80-0.95, resulting in the temperature of asphalt pavement in summer being much higher than the air temperature. High temperature on the road surface is the most direct cause of rutting. At the same time, the road surface is scorched by high temperature, which will reduce the comfort of drivers and passenger...

Claims

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Application Information

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IPC IPC(8): C04B28/00
Inventor 陈美祝万路吴少鹏洪晶冷滨滨
Owner WUHAN UNIV OF TECH
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