JP3588632B2 - Asphalt pavement surface and pavement structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an asphalt pavement surface layer having both water permeability, water retention and water absorption, and an asphalt pavement structure having water permeability, water retention and water absorption.
[0002]
[Prior art]
In recent years, as urban concrete and asphalt progress, the amount of latent heat transport decreases and the ground surface rises in temperature, while the amount of stored heat increases and heat is released from the ground surface at night, causing tropical nights. . In addition, the heat stroke incidence in summer is relatively high in road space, and there is a concern that heat stress on humans may be adversely affected. In addition, the increasing population cover has blocked rainwater from penetrating the ground, leading to lower groundwater levels and lower river flows. Against this background, there is a strong demand for pavements that reduce the heat island phenomenon, which continues to deteriorate, and improve the thermal environment, create a comfortable living environment, and contribute to groundwater recharge and urban-type flood control.
[0003]
Therefore, as a conventional asphalt pavement, a permeable pavement and a water-retentive pavement have been developed and introduced to the site. However, the surface of the permeable pavement has the ability to penetrate rainwater into the underground, but has little water retention, and thus did not prevent the temperature from rising. On the other hand, most of the water-retentive pavement surface so far has extremely low permeability and has little effect on groundwater recharge and runoff control.
[0004]
By the way, there is a type that fills the asphalt pavement gap with silt-based material to ensure water retention, and some of these types have a water permeability, but these are filled at the asphalt construction site. There is a problem that you need to do.
[0005]
[Problems to be solved by the invention]
Therefore, the present invention has fine continuous voids on the surface of the pavement, and rainwater effectively penetrates during rainfall to help recharge and control runoff of groundwater. The surface temperature can be suppressed by the latent heat transport accompanying evaporation while keeping the water of the water or sucking up the water stored in the surface layer voids to the surface layer by the action of hair management power, and performing filling work at the asphalt construction site It is intended to provide an asphalt pavement structure that is not required.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 provides 30 to 60 parts by weight of one of crushed sand, mountain sand and quartz sand No. 3 as fine aggregate and No. 7 as coarse aggregate. 50 to 70 parts by weight of crushed stone, 3.0 to 4.5 parts by weight of asphalt amount, and by incorporating stone powder, permeability by pavement permeability test during rain 1.0 × 10 ^-2 cm / s or more In addition to allowing rainwater to penetrate underground with water permeability, the volume of water content is 10% or more due to the capillary force of the surface pores. Rainwater and water spray are retained in the pores. A part of the asphalt pavement surface is characterized by having water retention, water permeability, and water absorption that prevent the surface of the pavement from becoming hot by a part of the surface moving by the action of capillary force and evaporating. There is .
[0007]
According to a second aspect of the invention, on the low permeable pavement permeability has the following water permeability 1.0 × 10 ^-3 cm / s, of the crushed sand, mountain sand and silica sand No. 3 as fine aggregate 30 to 60 parts by weight of one kind , 50 to 70 parts by weight of No. 7 crushed stone , 3.0 to 4.5 parts by weight of asphalt, and compounding of stone powder, during rainfall, the permeability coefficient by pavement permeability test Infiltration of rainwater into the underground with water permeability of 1.0 × 10 ^-2 cm / s or more, and at the time of fine weather, rainwater and water sprinkling are held in the void by volume force of 10% or more due to the capillary force of the surface void. During non-water spraying, a part of the water held in the gap moves to the surface layer by the action of capillary force and evaporates, thereby preventing the surface of the pavement from becoming hot, water-retaining, water-permeable, and water-absorbing. in asphalt pavement structure, characterized in that laid paving surface having a That.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The three embodiments of the invention described in claim 1 of the present invention as described above (hereinafter referred to as Examples 1, 2, and 3) and two comparative examples (hereinafter, referred to as Comparative Examples 1 and 2) composed of typical prior art. A comparative experiment was conducted on the performance of a test piece consisting of the following. The results will be described with reference to FIGS.
[0009]
The size of the specimens of Examples 1, 2, and 3 and Comparative Examples 1 and 2 used in this experiment is a pavement having a size of 30 cm 4 and a height of 5 cm. FIG. indicated and, (1) example 1, No. 7 crushed stone 50 parts by weight of coarse aggregate ratio, type and amount is 47 parts by weight a crushed sand of fine aggregate, type of asphalt high viscosity modifiers, The asphalt amount is 3 parts by weight , and the stone powder amount is 3 parts by weight . (2) Example 2, No. 7 crushed stone 60 parts by weight of coarse aggregate ratio, 37 parts by weight of type and amount of fine aggregate is a mountain sand, the type of asphalt high viscosity modifiers, asphalt amount 3 0.5 parts by weight and the amount of stone powder is 3 parts by weight . (3) Example 3, No. 7 crushed stone 50 parts by weight of coarse aggregate ratio, type and amount is 47 parts by weight a crushed sand of fine aggregate, type of asphalt high viscosity bleaching asphalt amount 3.5 Parts by weight and the amount of stone powder are 3 parts by weight .
[0010]
(4) Comparative Example 1, No. 6 crushed stone 39 parts by weight coarse aggregate ratio, No. 7 crushed stone 20 parts by weight, the type and amount of fine aggregate coarse sand 13 parts by weight, fine sand 10 parts by weight, crushed sand 13 weight Parts , asphalt type is ST60-80, asphalt amount is 5.5 parts by weight , and stone powder amount is 5 parts by weight . (5) Comparative Example 2, No. 6 crushed stone 82 parts by weight coarse aggregate ratio, type and amount of fine aggregate coarse sand 13 parts by weight, the type of asphalt ST60-80, asphalt amount 4.3 parts by weight And the amount of stone powder is 5 parts by weight .
[0011]
FIG. 2 is a diagram showing the results of a comparative experiment performed on the time change of the surface temperature between Examples 1, 2, and 3 and Comparative Examples 1 and 2. The experimental results will be described with reference to FIG. The experiment was performed in a climate chamber, which had a height of 3.4 m, a planar shape of 3.7 m x 3.6 m, and all the walls in the room were covered with reflecting mirrors. The temperature was set at 30 ° C. And to adjust the amount of radiation on the specimen at a constant value, is lit halogen lamp Total 64 (500 w), were placed specimens 4 body at a time. The surface of this specimen was at a height of 15 cm from the floor.
[0012]
Measurement of the amount of radiation at the center point of each specimen in this way ranged from ^{1190W / m 2 ~1250W / m 2} . Although no forced wind was generated, the air-conditioning function to keep the temperature at a constant value provided that the air-conditioning function was approximately 0.7 to 0.9 m / cm at a height of about 10 cm (25 cm from the floor) from the surface of the specimen. The wind was always blowing. In such a state, each specimen was housed in a heat insulating container to make the bottom impermeable, and at the start of the experiment, the gap was almost completely filled with water. At about 4 hours after the start of the experiment, the surface temperatures of Examples 1, 2, and 3 decreased by 12.9 ° C., 16.8 ° C., and 16.6 ° C., respectively, as compared with Comparative Examples 1 and 2. I was In addition, about 25%, 32%, and 25% of the water with respect to the initial water retention were lost by evaporation.
[0013]
As shown in FIG. 3, Examples 1, 2, and 3 have larger continuous porosity%, water permeability cm / s and water retention% than Comparative Examples 1 and 2, and have a stability of about 1%. It can be seen that 2.5 kN or more is secured, and since it has such characteristics, in combination with what is shown in Fig. 2, rainwater is drained underground with the same permeability as soil during rainfall and watering. The surface of the pavement is heated by the capillary force acting on the surface of the pavement when the rainfall is retained by the capillary force in fine weather and when water is not sprayed. Will be prevented.
[0014]
In addition, the invention described in claim 2 of the present invention is based on such a low water permeable pavement having a water permeability of 1.0 × 10 ⁻³ cm / s or less. In addition, since it is made of an asphalt structure constructed by laying, the rainwater has a permeability of 1.0 × 10 ⁻² cm / s or more in a pavement permeability test during rainfall, Due to the capillary force of the surface pores, the water content is 10% or more in volume and the rainwater or watering is retained in the pores. When the weather is fine or non-watering, the water retained in the pores moves to the surface by the action of the capillary force. It has water retention, water permeability, and water absorption to prevent the surface of the pavement from becoming hot due to evaporation.
[0015]
【The invention's effect】
The present invention is as described above, and the invention according to claim 1 uses 30 to 60 parts by weight of one of crushed sand, mountain sand and quartz sand No. 3 as fine aggregate and No. 7 as coarse aggregate. 50 to 70 parts by weight of crushed stone, 3.0 to 4.5 parts by weight of asphalt amount, and by incorporating stone powder, permeability by pavement permeability test during rain 1.0 × 10 ^-2 cm / s or more In addition to allowing rainwater to penetrate underground with water permeability, the volume of water content is 10% or more due to the capillary force of the surface pores. Rainwater and water spray are retained in the pores. The surface of the pavement is characterized by having a water retention property, a water permeability, and a water absorption property, which prevent the surface of the pavement from being heated by a portion of the pavement moving to the surface layer by the action of capillary force and evaporating. It is said that the surface of the pavement can be prevented from becoming hot There is a result.
[0016]
According to a second aspect of the invention, on the low permeable pavement permeability has the following water permeability 1.0 × 10 ^-3 cm / s, of the crushed sand, mountain sand and silica sand No. 3 as fine aggregate 30 to 60 parts by weight of one kind , 50 to 70 parts by weight of No. 7 crushed stone , 3.0 to 4.5 parts by weight of asphalt, and compounding of stone powder, during rainfall, the permeability coefficient by pavement permeability test Infiltration of rainwater into the underground with water permeability of 1.0 × 10 ^-2 cm / s or more, and holding of rainwater and sprinkling in the void by volume force of 10% or more due to the capillary force of the surface void, During non-water spraying, a part of the water held in the gap moves to the surface layer by the action of capillary force and evaporates, thereby preventing the surface of the pavement from becoming hot, water-retaining, water-permeable, and water-absorbing. in asphalt pavement structure, characterized in that laid paving surface having a As a result, the surface of the pavement is prevented from becoming hot, reducing the heat island phenomenon in the city and improving the thermal environment, and also has the effect of contributing to the recharge of groundwater and the suppression of runoff in rainy weather. This has the effect of greatly contributing to the solution of urban and global environmental problems.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of embodiments 1, 2, and 3 of the invention described in claim 1;
FIG. 2 is a comparison diagram showing a change over time of a surface temperature between Examples 1, 2, and 3 and Comparative Examples 1 and 2.
FIG. 3 is a comparison diagram of respective performances of Examples 1, 2, and 3 and Comparative Examples 1 and 2.

Claims (2)

Crushed sand as fine aggregate, mountain sand and 30 to 60 parts by weight of one kind of silica sand No. 3, 50 to 70 parts by weight of No. 7 crushed stone as coarse aggregate, asphalt amount 3.0 to 4.5 parts by weight , And stone powder to allow rainwater to penetrate into the ground with a permeability of 1.0 × 10 ^-2 cm / s or more in a pavement permeability test during rainfall, and the volume of water is increased by the capillary force of the surface pores. At a rate of 10% or more, rainwater or sprinkling water is held in the gap, and in fine weather and when water is not sprayed, part of the water held in the gap moves to the surface layer by the action of capillary force and evaporates. A pavement surface layer having water retention, water permeability, and water absorption for preventing the surface of the pavement from becoming hot. On the low permeable pavement permeability has the following water permeability 1.0 × 10 ^-3 cm / s, crushed sand as fine aggregate, 30 to 60 parts by weight of one kind of pit sand and silica sand No. 3 , No. 7 crushed stone , 50-70 parts by weight , asphalt amount of 3.0-4.5 parts by weight , and stone powder are mixed, so that during rainfall, the permeability coefficient by pavement permeability test is 1.0 × 10 ^-2 cm / Infiltrate rainwater into the underground with water permeability of s or more, and keep the rainwater and sprinkling water in the air gap by volume of 10% or more by the capillary force of the surface air gap, and keep it in the air gap in fine weather and when water is not sprayed Laying a pavement surface layer with water retention, water permeability, and water absorption that prevents the surface of the pavement from becoming hot due to a part of the water that has been transferred to the surface layer by the action of capillary force and evaporates. Asphalt pavement structure characterized by.

Images