JP2006241730A - Low heat radiation soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low heat radiation soil which is inexpensive and facilitates effective fall of a ground surface temperature in a fine weather and high temperature condition in summer by increasing the water retentivity of surface soil in soil-based pavement ground. <P>SOLUTION: The low heat radiation soil is obtained by mixing a water retaining material in a ground pavement body having the soil-based pavement material as the surface soil. The water retaining material exerts water retaining ability higher than that of the soil-based pavement material and has a maximum particle size of 10 mm or less. The water retaining material to be mixed is not less than 10% the volume of the surface layer soil, and preferably not less than 20%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a low heat radiation soil capable of reducing a ground surface temperature at a high temperature in summer by a vaporization heat of water contained in a surface layer soil in an earth-based pavement ground.

  Earth-based pavement ground is easy to get muddy when it contains a lot of water due to rain, etc., but it is the most popular among the ground because it can be easily constructed at low cost. A wide range of people.

  The surface temperature of the earth-based pavement ground at high temperatures in summer is lower than that of an all-weather pavement ground, but in fact, the radiation heat from the pavement surface is large, so it is a severe environment for users, and heat stroke Has also occurred frequently.

  All-weather pavement grounds such as polyurethane and artificial turf use materials that do not raise the surface temperature, and measures such as lowering the temperature by providing water retention layers and water pipes in the ground to supply water to the surface layer. Yes.

  In road pavements other than the ground, heat insulation paint is applied to the surface to suppress the rise in surface temperature, or a water retention material is mixed in the pavement and the temperature is lowered using the heat of vaporization of water. There are also.

  As described in Patent Document 1, using rainwater that falls on roads, artificial ground surfaces, or rooftops of buildings, etc., the temperature rise that continuously lowers the surface temperature raised by direct sunlight and suppresses the heat island phenomenon The invention of the prevention system is also disclosed.

  In addition, as described in Patent Document 2, the invention of an environmentally improved paving material in which an inorganic solidifying material, an absorbing water retention material, and an inorganic pigment are blended with natural earth and sand is disclosed in the park paved streets and open spaces. ing.

Furthermore, as described in Patent Document 3, a patent for a paving material in which Portland cement is contained as a binder in an aggregate containing granulated slag particles and a paving block using the same is also registered.
JP 2003-105883 A JP 2003-129405 A Japanese Patent No. 3050793

  However, no method other than watering is performed on the earth-based pavement ground. Sprinkling reduces the surface temperature of the ground and reduces the radiant heat from the ground due to the heat of vaporization of the water, but the water evaporates quickly or penetrates into the ground, so it is effectively temporary belongs to.

  Therefore, the present invention provides a low heat radiation soil that can effectively reduce the ground surface temperature at the time of fine weather in summer easily and inexpensively by increasing the water retention of the surface soil of the earth-based pavement ground. It is intended.

  In order to solve the above-mentioned problems, the present invention provides a ground pavement 2 having a soil pavement 3a as a surface soil 3, and has a water retention capacity higher than that of the soil pavement 3a and a maximum particle size of 10 mm or less. Is a low heat radiation soil 1 characterized by mixing 10% or more, preferably 20% or more of the water retaining material 3b with respect to the volume of the surface soil 3, and a clay-based paving material 3a having a particle size adjusting material. In the ground pavement 2 having a surface soil 3 mixed with the sandy aggregate 3c, the sandy aggregate 3c has a higher water retention capacity than the sandy aggregate 3c and has a maximum particle size. It was set as the structure of the low heat radiation soil 1a characterized by replacing with the water retention material 3b which is 10 millimeters or less so that it might become 10% or more with respect to the volume of the surface soil 3, Preferably it is 20% or more.

  Since this invention is the above structure, the following effects are acquired. First, the water retention capacity of the surface layer is very high, and even if it rains and contains a large amount of water, the ground does not become muddy and can be used immediately.

  Second, the effect of suppressing radiant heat from the ground surface can be maintained for a long time by vaporization of water contained in the surface layer. Heat stroke can also be prevented and a comfortable use space can be provided.

  For the purpose of enhancing the water retention capacity of the earth-based pavement ground, an inorganic water-retaining material (maximum particle size of 10 mm or less) is mixed in the entire surface layer or a part of the surface layer with a volume of 10% or more, preferably 20% or more. It was realized by doing.

  Below, based on an accompanying drawing, the low heat radiation soil which is this invention is demonstrated in detail. FIG. 1 is an overall view of a low heat radiation soil according to the present invention, and FIG. 2 is an enlarged view of a pavement of the low heat radiation soil according to the present invention.

  The low heat radiation soil 1 has a water retention material 3b having a water retention capacity higher than that of the soil pavement material 3a and having a maximum particle size of 10 mm or less. 10% or more, preferably 20% or more is mixed with respect to the volume of the surface soil 3.

  The low heat radiation soil 1 is paved by placing a pavement 2 on natural soil 5. The natural soil 5 is soil in a state before being paved on the low heat radiation soil 1. In addition, the state of the natural soil 5 is various, and may be natural or artificial soil that has already been processed.

  The pavement body 2 is composed of a lower layer soil 4 as a base and a surface layer soil 3 as a ground, like the general ground pavement, with the lower layer soil 4 placed on the natural soil 5 and further on the lower layer soil 4. Place the surface soil 3 on the pavement.

  The subsoil 4 is made by leveling aggregates such as crushed stones and volcanic gravel and compacting them with rollers. A two-layer structure such as crushed stone at the lower part of the lower soil 4 and volcanic gravel at the upper part can also be used.

  In the surface soil 3, there are a case where the water retaining material 3b is added to the soil paving material 3a and a case where the sandy aggregate 3c mixed as a particle size adjusting material of the soil paving material 3a is replaced with the water retaining material 3b. In addition, as the water retention material 3b, a material having a higher water retention capacity than the earth-based paving material 3a and the sandy aggregate 3c is used.

  The earth-based pavement material 3 a is natural or artificial soil that is a main component of the surface soil 3. There are various types such as pure sand soil, Arakida soil, red soil, black soil, sand, crushed stone screenings, or anthuka, and a plurality of these can be used in combination.

  Pure sand is a soil that has been granulated from granite and contains sand and small stones. Pure sand soil is relatively excellent in tread resistance and is suitable for ground paving, but is characterized by weak water retention.

  Arakida soil is a brownish brown adhesive clay and is used for wall soil and gardening. Originally produced in Arakidahara on the Arakawa coast of Tokyo, it now refers to the same kind of soil produced from paddy fields and swamps, regardless of where it originated.

  Red soil is a brownish or reddish brown soil, mostly derived from weathered volcanic ash and rich in iron. Moreover, black soil is a black soil suitable for cultivation, including spoiled plant matter. Red soil and black soil have a high content of fine particles, and when they contain water, they are extremely muddy.

  The crushed stone screenings are crushed rocks that have been crushed and finely sized by sieving. Since the crushed stone screening is heavier than the soil, when it is used for ground pavement, it is possible to prevent generation of soil smoke.

  Antuca is a brick-colored soil made of special clay baked with high heat, and is characterized by its porosity and good drainage. Untuca is also excellent in water permeability and water retention, and is suitable for athletic fields and tennis courts.

  Water retaining material 3b is a by-product in industrial production such as waste molten slag, granulated slag, fly ash, coal bottom ash or paper sludge ash, diatomaceous earth burned grains, artificial aggregate such as zeolite or perlite, or natural aggregate such as volcanic gravel These can be used in combination.

  Garbage melting slag is a residue that emerges when garbage and metal are burned and melted at a high temperature, and granulated slag is granulated by rapidly cooling waste melting slag. Waste molten slag and granulated slag are paving materials having water retention and water permeability.

  Fly ash and coal bottom ash are coal ash generated in a thermal power plant, and have both water retention and water permeability. Fly ash when coal is burned is fly ash, and incineration ash when coal is burned is coal bottom ash.

  Paper sludge ash (PS ash) is obtained by incinerating waste generated in the process of recycling used copy paper or newspaper into recycled paper at a high temperature, and has high water retention and water permeability because it is porous.

  Diatomaceous earth burned grains are diatomaceous earth that is sediments such as the bottom of the sea or lake, in which clay is mixed with the remains of diatoms, heated in a furnace or exposed to hot air. Diatomaceous earth calcined grains are porous, have a large water retention capacity and water retention capacity, and a long water retention time.

  Zeolite is a general term for siliceous ion exchangers, and is a crystal body in which metal ions are arranged using silicon and aluminum as a skeleton. Zeolite is an ore that is porous and has excellent water-holding power so that it can be used for softening water or molecular sieves.

  Perlite is a porous material that is crushed from pearlite or obsidian and baked at a high temperature, and is lightweight and excellent in heat insulation and sound absorption. Perlite is used for land improvement materials for the purpose of water retention.

  Volcanic gravel is light-weight sand and pebbles that have become fine as a result of crushed rocks produced by volcanic activity. Volcanic gravel has high water retention and can suppress soil drying.

  As the water retaining material 3b, an inorganic material is selected because it does not corrode or has to be decomposed in the ground. By using the inorganic water retaining material 3b, a continuous water retaining ability can be expected, and the water retaining capacity of the surface soil 3 is increased.

  Various earth-based paving materials 3a are used depending on the purpose of the ground. Moreover, there are various types of water retaining material 3b, and the water retaining capacity is also different. In the low heat radiation soil 1, it is necessary to select a combination of the soil-based pavement material 3 a and the water retention material 3 b that increases the water retention of the surface soil 3.

  For example, when the water retaining material 3b is mixed with the existing surface soil 3, the water retaining material 3b has a higher water retaining capacity than the existing soil-based pavement material 3a. Further, when the surface soil 3 is newly paved with a single soil-based pavement material 3a, the water-retaining material 3b has a higher water retention capacity than at least the soil-based pavement material 3a.

  The mixing amount of the water retaining material 3b is 10% or more, preferably 20% or more with respect to the volume of the surface soil 3. Note that the range of the mixing amount varies depending on the material of the earth-based paving material 3a, but is a range that does not hinder the performance as a ground.

  The maximum particle size of the water retaining material 3b is preferably 10 millimeters or less. If the particle size exceeds 10 millimeters, it will interfere with sports competitions and may cause injury when falling or sliding.

  Mixing of the water retaining material 3b may be performed on the entire surface soil 3, or only the surface portion of the surface soil 3 if there is no problem in water retention capacity and ground performance. The earth-based pavement material 3a and the water retention material 3b are mixed so as to increase the effect.

  As a mixing method of the water retaining material 3b, there are a method performed by a mixer such as a mixer and a method performed by laying the water retaining material 3b on the surface of the paved earth-based pavement material 3a and performing it by a cultivator such as a tractor. .

  FIG. 3 is a diagram showing a state in which a sand retention aggregate is mixed with a soil pavement material of low heat radiation soil according to the present invention and is replaced with a water retention material. The soil pavement material 3a and the water retention material 3b are the same as in the first embodiment.

  The low heat radiation soil 1a is a ground pavement 2 in which a sandy aggregate 3c as a particle size adjusting material is mixed with a viscous soil pavement 3a. 10% or more, preferably 20% or more with respect to the volume of the surface soil 3 to the water retaining material 3b having a water retaining capacity higher than that of the sandy aggregate 3c and having a maximum particle size of 10 millimeters or less. It is characterized by having been replaced as follows.

  When the earth-based pavement material 3a has a high content of fine particles and is viscous, it tends to become muddy when it contains water, so the sandy aggregate 3c is mixed to adjust the particle size. Water permeability is increased by adjusting the particle size, and there is no problem in using it as a ground. Sand or gravel is used for the sandy aggregate 3c.

  When the sand-based aggregate 3c is mixed as the particle size adjusting material to make the soil-based paving material 3a, all or part of the sand-based aggregate 3c is replaced with the water retaining material 3b and mixed. The water retaining material 3b also serves as the sandy aggregate 3c.

  For the purpose of enhancing the water retention effect, the water retention material 3b has a higher water retention capacity than the sandy aggregate 3c. Moreover, it is necessary to select the water retaining material 3b that does not impair the effect of the sandy aggregate 3c.

  FIG. 4 is a table showing the average surface temperature and water content ratio when the mixing amount of the water retention material of the low heat radiation soil according to the present invention is changed, and FIG. 5 is the type of the water retention material of the low heat radiation soil according to the present invention. It is a table | surface which shows the average surface temperature at the time of changing and water content ratio.

  In FIG. 4, four types of pavement 6a, pavement 6b, pavement 6c, and pavement 6d in which pure sand is used as the earth-based pavement 3a and paper sludge ash (PS ash) is mixed as the water retention material 3b. Packed in a non-woven cloth-covered container soaked in water for 1 hour, soaked in water for 1 hour, then lifted from water and allowed to stand for 1 hour.

  Using a thermistor-type thermometer on a sunny day outdoors in summer, the surface temperature is measured every 10 minutes for 3 days, and the average temperature from 10 am to 3 pm is the highest temperature of the day. Were calculated and compared. In addition, the water content immediately before the start of measurement was also measured. The thermistor is an element that utilizes the property of a semiconductor in which the electrical resistance changes greatly with a slight change in temperature.

  The pavement 6a is 100% pure sand soil, the average surface temperature on the first day is 38.2 ° C, the average surface temperature on the second day is 47.2 ° C, and the average surface temperature on the third day is 47. It was 6 ° C and the water content ratio was 14.4%.

  The pavement 6b is a case of pure sand soil 90%, paper sludge ash (PS ash) 10%, the average surface temperature on the first day is 37.8 ° C, the average surface temperature on the second day is 39.9 ° C, The average surface temperature on the third day was 43.2 ° C., and the water content ratio was 20.9%.

  The pavement 6c is 80% pure sand soil and 20% paper sludge ash (PS ash). The average surface temperature on the first day is 37.2 ° C, the average surface temperature on the second day is 38.4 ° C, On the third day, the average surface temperature was 38.8 ° C., and the water content ratio was 27.2%.

  The pavement 6d is a case of 70% pure sand soil and 30% paper sludge ash (PS ash). The average surface temperature on the first day is 37.1 ° C, the average surface temperature on the second day is 38.4 ° C, The average surface temperature on the third day was 38.6 ° C., and the water content ratio was 33.1%.

  For the first day, the pavement 6a, the pavement 6b, the pavement 6c, and the pavement 6d were measured after sufficiently containing water. The temperature was slightly lower. The temperature difference from the pavement 6a is minus 0.4 ° C. for the pavement 6b, minus 1.0 ° C. for the pavement 6c, and minus 1.1 ° C. for the pavement 6d.

  On the second day, the pavement 6b, the pavement 6c, and the pavement 6d are lower in temperature than the pavement 6a, and all have the same level of temperature rise suppression effect. The temperature difference from the pavement 6a is minus 7.3 ° C for the pavement 6b, minus 8.8 ° C for the pavement 6c, and minus 8.8 ° C for the pavement 6d.

  For the third day, the temperature of the pavement 6b, pavement 6c, and pavement 6d is lower than that of the pavement 6a, but the temperature rise suppression effect of the pavement 6c and pavement 6d is greater than that of the pavement 6b. . The temperature difference from the pavement 6a is minus 4.4 ° C for the pavement 6b, minus 8.8 ° C for the pavement 6c, and minus 9.0 ° C for the pavement 6d.

  In FIG. 5, black soil is used as the soil-based paving material 3a, and usually the particle size is adjusted by mixing the sandy aggregate 3c, but the pavement 7a using the water retaining material 3b instead of the sandy aggregate 3c. 4 types of pavement 7b, pavement 7c and pavement 7d are packed in a non-woven cloth-covered container soaked in water, soaked in water for 1 hour, then lifted from water and left for 1 hour Measure what you did.

  Using a thermistor-type thermometer on a sunny day outdoors in summer, the surface temperature is measured every 10 minutes for 3 days, and the average temperature from 10 am to 3 pm is the highest temperature of the day. Were calculated and compared. In addition, the water content immediately before the start of measurement was also measured.

  The pavement 7a is 60% black soil and 40% sandy aggregate 3c (sand). The average surface temperature on the first day is 37.5 ° C, and the average surface temperature on the second day is 44.8 ° C. The average surface temperature on the third day was 45.6 ° C., and the water content ratio was 35.9%.

  The pavement 7b is a case of black soil 60% and granulated slag 40%, the average surface temperature on the first day is 36.8 ° C, the average surface temperature on the second day is 38.8 ° C, and the average on the third day The surface temperature was 40.5 ° C. and the water content ratio was 44.7%.

  The pavement 7c is a case of black soil 60%, Isolite (registered trademark) 40%, the average surface temperature on the first day is 37.0 ° C, the average surface temperature on the second day is 38.1 ° C, and the third day The average surface temperature was 39.0 ° C., and the water content ratio was 65.8%. Note that Isolite (registered trademark) is obtained by baking and solidifying diatomaceous earth.

  The pavement 7d is a case of black soil 60%, paper sludge ash (PS ash) 40%, the average surface temperature on the first day is 36.8 ° C, the average surface temperature on the second day is 37.9 ° C, 3 The average surface temperature on the day was 38.1 ° C., and the water content ratio was 71.3%.

  For the first day, the pavement 7a, pavement 7b, pavement 7c and pavement 7d were measured after sufficiently containing water, so the pavement 7b, pavement 7c and pavement 7d were compared to the pavement 7a. The temperature was slightly lower. The temperature difference from the pavement 7a is minus 0.7 ° C for the pavement 7b, minus 0.5 ° C for the pavement 7c, and minus 0.7 ° C for the pavement 7d.

  On the second day, the pavement 7b, the pavement 7c, and the pavement 7d are lower in temperature than the pavement 7a, and all have the same level of temperature rise suppression effect. The temperature difference from the pavement 7a is minus 6.0 ° C for the pavement 7b, minus 6.7 ° C for the pavement 7c, and minus 6.9 ° C for the pavement 7d.

  On the third day, the temperature of the pavement 7b, pavement 7c, and pavement 7d is lower than that of the pavement 7a, but the temperature rise suppression effect of the pavement 7c and pavement 7d is greater than that of the pavement 7b. . The temperature difference from the pavement 7a is minus 5.1 ° C for the pavement 7b, minus 6.6 ° C for the pavement 7c, and minus 7.5 ° C for the pavement 7d.

  FIG. 6 is a graph showing the transition of the amount of heat flowing into the human body due to the radiation related to the true sand in the low heat radiation soil according to the present invention, and FIG. 7 is the human body due to the radiation related to the black soil in the low heat radiation soil according to the present invention. It is a graph which shows transition of the heat inflow amount.

  As shown in FIG. 6, graph 8 shows how the amount of heat inflow into the human body due to the radiation from 8 days after the soil is immersed in water for the sand sand 8a and the paper sludge mixed ash sand 8b is changed. It is a comparison. The amount of heat flowing into the human body due to radiation is expressed in watt density per square meter.

The true sandy soil 8a is a case of 100% pure sandy soil, which was about 159 (W / m ² ) at the time of immersion, but about 143 (W / m ² ) after one day and about 152 after two days. (W / m ² ) About 229 (W / m ² ) after 3 days, about 273 (W / m ² ) after 4 days, about 316 (W / m ² ) after 5 days, after 6 days It shifts to about 327 (W / m ² ), about 340 (W / m ² ) after 7 days, and about 352 (W / m ² ) after 8 days.

Paper sludge ash mixed pure sand soil 8b is a case where 30% of paper sludge ash is mixed with pure sand soil, and was about 136 (W / m ² ) at the time of immersion, but about 143 (W / m ² ) after one day. m ² ) about 179 (W / m ² ) after 2 days, about 181 (W / m ² ) after 3 days, about 203 (W / m ² ) after 4 days, about 226 (after 5 days) W / m ² ), 6 days later, about 253 (W / m ² ), 7 days later, about 274 (W / m ² ), 8 days later, about 307 (W / m ² ).

  When mixing 30% of paper sludge ash with pure sand soil, which is a typical natural ground soil, compared to the case of pure sand soil alone, the heat inflow to the human body due to radiation is up to 28% (5 Day) Can be attenuated.

  As shown in FIG. 7, graph 9 shows the heat to the human body due to radiation until 11 days after the soil is immersed in water for sand mixed black soil 9a, granulated slag mixed black soil 9b, and paper sludge mixed black soil 9c. It is a comparison of how the inflow changes.

The sand-mixed black soil 9a is a case where 40% of sand as a sandy aggregate is mixed with black soil, and was about 127 (W / m ² ) when immersed, but about 118 (W / m ² ) after one day. m ² ) About 130 (W / m ² ) after 2 days, about 132 (W / m ² ) after 3 days, about 131 (W / m ² ) after 4 days, about 172 (after 5 days) W / m ² ), after about 6 days, about 253 (W / m ² ), after 7 days, about 280 (W / m ² ), after 8 days, about 307 (W / m ² ), after about 9 days, about 334 (W / m ² ), 10 days later, about 360 (W / m ² ), and 11 days later, about 387 (W / m ² ).

Granulated slag mixed black soil 9b is a case where 40% of granulated slag is mixed in place of the sand mixed in the black soil, and is about 127 (W / m ² ) when immersed. Is approximately 139 (W / m ² ) after 2 days, approximately 122 (W / m ² ) after 3 days, approximately 132 (W / m ² ) after 3 days, approximately 131 (W / m ² ) after 4 days, 5 About 137 (W / m ² ) after 6 days, about 170 (W / m ² ) after 6 days, about 202 (W / m ² ) after 7 days, about 235 (W / m ² ) after 8 days After 9 days, the change is about 267 (W / m ² ), after 10 days, about 300 (W / m ² ), and after 11 days, about 333 (W / m ² ).

Paper sludge ash mixed black soil 9c is a case where 40% of paper sludge ash is mixed instead of the sand mixed in the black soil, and what was about 142 (W / m ² ) at the time of immersion is one day later. Is approximately 141 (W / m ² ) after 2 days, approximately 145 (W / m ² ) after 3 days, approximately 138 (W / m ² ) after 4 days, approximately 137 (W / m ² ) after 4 days, 5 About 136 (W / m ² ) after 6 days, about 135 (W / m ² ) after 6 days, about 134 (W / m ² ) after 7 days, about 132 (W / m ² ) after 8 days After 9 days, the change is about 131 (W / m ² ), after 10 days, about 177 (W / m ² ), and after 11 days, about 261 (W / m ² ).

  When the black mixed sand, which is a typical natural ground soil, is replaced with granulated slag or paper sludge ash, it is 4 days to 11 days after the water has been completely submerged, compared to when the sand is mixed. For a week, it is possible to attenuate the heat inflow to the human body by radiation up to 33% (6th day) with granulated slag and up to 61% (9th day) with paper sludge ash.

  FIG. 8 is a graph comparing the amount of heat flowing into the human body of the low heat radiation soil according to the present invention, and FIG. 9 shows whether the radiation is kept low even when the moisture content of the low heat radiation soil according to the present invention is high. It is a graph comparing how.

  As shown in FIG. 8, the graph 10 shows a true sand soil 10a, an improved soil 10b, an improved soil 10c, an improved soil 10d, an improved soil 10e, a urethane pavement 10f, a natural grass (wet) 10g, a natural grass (dry) 10h, and an artificial material. For turf (wet) 10i, the amount of heat flowing into the human body is shown.

  For urethane pavement 10f, natural turf (wet) 10g, natural turf (dry) 10h, and artificial turf (wet) 10i that are not earth-based ground pavements, the amount of heat flowing into the human body is almost unchanged.

  On the other hand, the pure sand soil 10a, the improved soil 10b, the improved soil 10c, the improved soil 10d, and the improved soil 10e reduce the amount of heat flowing into the human body as the water content ratio increases. In particular, the improved soil 10b, the improved soil 10c, the improved soil 10d, and the improved soil 10e mixed with the water retaining material 3b are more effective than the case of the pure sand soil 10a alone.

  As shown in FIG. 9, graph 11 shows black soil 11a, improved soil 11b, improved soil 11c, improved soil 11d, improved soil 11e, improved soil 11f, improved soil 11g, improved soil 11h, urethane pavement 11i, natural grass (wet ) 11j, natural turf (dry) 11k, and artificial turf (wet) 11l indicate the heat inflow to the human body.

  For urethane pavement 11i, natural turf (wet) 11j, natural turf (dry) 11k and artificial turf (wet) 11l which are not earth-based ground pavements, the amount of heat flowing into the human body is almost the same.

  On the other hand, the black soil 11a, the improved soil 11b, the improved soil 11c, the improved soil 11d, the improved soil 11e, the improved soil 11f, the improved soil 11g, and the improved soil 11h do not become mud even if the water content ratio becomes high. Keep radiation low over time. In particular, the improved soil 11b, the improved soil 11c, the improved soil 11d, the improved soil 11e, the improved soil 11f, the improved soil 11g, and the improved soil 11h mixed with the water retaining material 3b have a great effect.

  As described above, the low heat radiation soil 1 according to the present invention has a very high water retention capacity on the surface layer, and even if it rains and contains a large amount of water, the ground does not become muddy and is used immediately. It becomes possible.

  Moreover, the effect of suppressing radiant heat from the ground surface can be maintained for a long time by vaporization of water contained in the surface layer. Heat stroke can also be prevented and a comfortable use space can be provided.

It is a general view of the low heat radiation soil which is this invention. It is an enlarged view of the pavement body of the low heat radiation soil which is this invention. It is a figure which shows the state replaced with the water retention material, when the sandy aggregate is mixed with the earth-based pavement material of the low thermal radiation soil which is this invention. It is a table | surface which shows the average surface temperature and moisture content at the time of changing the mixing amount of the water retention material of the low heat radiation soil which is this invention. It is a table | surface which shows the average surface temperature and moisture content at the time of changing the kind of water retention material of the low heat radiation soil which is this invention. It is a graph which shows transition of the heat inflow amount to the human body by the radiation related to the true sandy soil of the low heat radiation soil which is this invention. It is a graph which shows transition of the heat inflow amount to a human body by the radiation related to the black soil of the low heat radiation soil which is this invention. It is the graph which compared the heat inflow amount to the human body of the low heat radiation soil which is this invention. It is the graph which compared whether radiation is maintained low even if the moisture content of the low heat radiation soil which is this invention becomes high.

Explanation of symbols

1 Low Thermal Radiation Soil 1a Low Thermal Radiation Soil 2 Pavement 3 Surface Soil 3a Soil Pavement 3b Water Retentive Material 3c Sandy Aggregate 4 Lower Soil 5 Natural Soil 6 Table 6a Pavement 6b Pavement 6c Pavement 7 Table 7a Pavement 7b Pavement 7c Pavement 8 Graph 8a Pure sand 8b Paper sludge ash mixed pure sand 9 Graph 9a Sand mixed black soil 9b Granulated slag mixed black soil 9c Paper sludge ash mixed black soil 10 Graph 10a Pure sand soil 10b Improved soil 10c Improved soil 10d Improved soil 10d 10e Improved soil 10f Urethane pavement 10g Natural grass (wet)
10h Natural grass (dry)
10i Artificial grass (humid)
11 graph 11a black soil 11b improved soil 11c improved soil 11d improved soil 11e improved soil 11f improved soil 11g improved soil 11h improved soil 11i urethane pavement 11j natural turf (wet)
11k Natural grass (dry)
11l artificial grass (humid)

Claims (4)

  10% or more of the water retaining material having a water retention capacity higher than that of the soil-based pavement and having a maximum particle size of 10 mm or less to the ground pavement using the soil-based pavement as surface soil. Low thermal radiation soil, preferably 20% or more mixed.   In a ground pavement that uses sandy aggregate as a particle size adjuster mixed with a viscous soil-based pavement, the sandy aggregate is more water retaining than the sandy aggregate. A low heat radiation soil, characterized in that it is replaced with a water retention material having a high maximum particle size of 10 millimeters or less so as to be 10% or more, preferably 20% or more, relative to the volume of the surface soil.   The low thermal radiation soil according to claim 1 or 2, wherein the earth-based pavement material is pure sand soil, Arakida soil, red soil, black soil, sand, crushed stone screenings or anthuka, or a mixture thereof. . Water retention materials are waste molten slag, granulated slag, fly ash, coal bottom ash or by-products such as paper sludge ash, diatomaceous earth particles, artificial aggregates such as zeolite or perlite, or natural aggregates such as volcanic gravel, or these The low heat radiation soil according to claim 1, 2 or 3, wherein a plurality of the soils are mixed.

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