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Aggregate for lowering pavement temperature and method for preparing bitumen mixture by utilizing same

A technology for asphalt mixture and pavement temperature, applied in sustainable waste treatment, solid waste management, climate change adaptation, etc., can solve problems such as hazards, high stone cost, and high thermal conductivity of wear layers

Inactive Publication Date: 2010-09-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems of the high cost of the existing stone materials and the high thermal conductivity of the wear layer when the road wear layer is paved as the asphalt mixture aggregate, which makes the road surface temperature high, thereby causing the urban heat island effect and rutting hazards, and provides a method for reducing the road surface temperature. Aggregates and their application methods

Method used

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  • Aggregate for lowering pavement temperature and method for preparing bitumen mixture by utilizing same
  • Aggregate for lowering pavement temperature and method for preparing bitumen mixture by utilizing same
  • Aggregate for lowering pavement temperature and method for preparing bitumen mixture by utilizing same

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specific Embodiment approach 1

[0013] Embodiment 1: The aggregates for reducing the temperature of the road surface in this embodiment are waste ceramic particles with a particle size of 4.75 mm to 9.5 mm.

[0014] The aggregate for reducing the temperature of the road surface in this embodiment is obtained by crushing and grinding waste ceramics, and the cost is 3 to 4 yuan / cubic meter, which is 80% to 90% lower than the cost of stone aggregates of the same volume The pottery is a kind of material with lower thermal conductivity, and the aggregate that reduces the temperature of the pavement of the present invention is used to replace part of the stone aggregate in the conventional aggregate to prepare an asphalt mixture, and use the asphalt mixture to adopt a conventional method to pave the road Therefore, the thermal properties of the wearing layer are changed, and the thermal conductivity of the wearing layer is reduced from 1.000W / m·℃~1.020W / m·℃ to 0.680W / m·℃~0.690W / m·℃. The temperature difference betw...

specific Embodiment approach 2

[0015] Embodiment 2: The waste ceramic particles in this embodiment are one or a combination of architectural ceramics, household ceramics, sanitary ceramics and sanitary products. Others are the same as in the first embodiment.

[0016] When the ceramics of this embodiment are a composition, ceramics are combined in arbitrary ratios.

specific Embodiment approach 3

[0017] Specific implementation mode three: the method for preparing asphalt mixture by utilizing aggregates that reduce the temperature of the road surface in this embodiment is carried out in the following steps: one, calculate the stone material consumption according to the SAC-10 mineral material gradation; two, use the described method of claim 1 The aggregate for lowering the temperature of the road surface replaces 18% to 22% (volume) of the stone with a particle size of 4.75mm to 9.5mm calculated in step 1, then weighs the stone and the aggregate for lowering the temperature of the road surface, and mixes them evenly to obtain a mixed Aggregate; 3. Prepare 86.8% to 88.1% mixed aggregate, 5.5% to 6% mineral powder, 1.8% to 2.2% slaked lime and 4.6% to 5% asphalt to prepare asphalt mixture according to the mass percentage.

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Abstract

The invention discloses an aggregate for lowering pavement temperature and a method for preparing a bitumen mixture by utilizing the same, which relates to an aggregate and a method for preparing a bitumen mixture by utilizing the aggregate, and solves the problems that the existing stone serving as the aggregate for paving a highway wearing layer has large thermal coefficient and high cost. The aggregate for lowering the pavement temperature of the invention is wasted ceramic particles with the grain diameter of 4.75mm-9.5mm. The method for preparing the bitumen mixture by utilizing the aggregate comprises the following steps: 1), computing needed stones with various grain diameters according to the grading mode of the wearing layer; 2), utilizing the aggregate to substitute for 18%-22% of the volume of the stone with the grain diameter of 4.75mm-9.5mm, weighting, and evenly mixing; and 3), preparing the mixed aggregate, mineral powder, slaked lime and bitumen into the bitumen mixture by the conventional method. The invention has low cost, and the thermal coefficient of the prepared wearing layer is 0.680W / m.DEG C-0.690W / m.DEG C, thus track diseases and the urban heat land effect are reduced, and the aggregate can be used for paving highways.

Description

technical field [0001] The present invention relates to aggregates and methods for preparing asphalt mixtures. Background technique [0002] The expressway surface layer directly bears the influence of vehicle load and natural factors, and transmits the load to the pavement structure layer of the base layer. The wear layer is located on the top layer of the surface layer. The quality of the wear layer directly affects the life and other properties of the road. Asphalt The paving material of the wear layer of concrete expressway is asphalt mixture, which is a multiphase composite material composed of aggregate, mortar and voids, wherein the aggregate is stone, the mortar is asphalt and mineral powder, and asphalt mixture The range of the mass ratio of each material is stone: slag: asphalt = 87.3-88: 7.5-7.8: 4.5-4.9, and the particle size of the stone should meet the commonly used gradation table of the wearing layer shown in Table 1. [0003] Table 1 Commonly used SAC-10 mi...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B26/26
CPCY02A30/60Y02W30/91
Inventor 冯德成张鑫王东升易军艳
Owner HARBIN INST OF TECH
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