Solar heat cutoff paved body

Abstract

A solar heat cutout pavement, wherein hollow fine particles and/or pigment absorbing solar heat in visible wavelength area and reflecting solar heat in infrared wavelength area is allowed to exist in the surface layer part of the pavement, whereby the rise of a road surface temperature by solar heat can be effectively suppressed.

1 . A solar heat cutoff pavement containing in a surface layer portion thereof hollow fine particles and/or a pigment which absorbs solar heat in the visible wavelength region and reflects solar heat in the infrared wavelength region.  
   
   
       2 . A pavement according to  claim 1 , wherein said hollow fine particles are inorganic hollow fine particles.  
   
   
       3 . A pavement according to  claim 2 , wherein said inorganic hollow fine particles are hollow fine ceramic particles.  
   
   
       4 . A pavement according to  claim 1 , wherein said pigment has a solar radiation reflectance defined by JIS A 5759 of not less than 15% and an L* value in CIE 1976 L*a*b* color space of not larger than 30.  
   
   
       5 . A pavement according to  claim 1 , further containing, in addition to said pigment, at least one colored pigment having a solar radiation reflectance defined by JIS A 5759 of not less than 12% and, if necessary, a white pigment.  
   
   
       6 . A pavement according to  claim 1 , wherein said surface layer portion is formed by applying a coating composition to the surface of the pavement, said coating composition comprising a binder capable of forming a solid surface layer portion when applied to the surface of the pavement, as well as said hollow fine particles and/or said pigment which absorbs solar heat in the visible wavelength region and reflects solar heat in the infrared wavelength region and, if necessary, other pigment(s) all incorporated in said binder.  
   
   
       7 . A pavement according to  claim 6 , wherein said binder is selected from the group consisting of resin, asphalt, asphalt emulsion, and cement.  
   
   
       8 . A method for forming a solar heat cutoff pavement, comprising the steps of applying a coating composition to the surface of a pavement, said coating composition comprising a binder capable of forming a solid surface layer portion when applied to the surface of the pavement, as well as hollow fine particles and/or a pigment which absorbs solar heat in the visible wavelength region and reflects solar heat in the infrared wavelength region, said hollow fine particles and/or said pigment being incorporated in said binder, and subsequently hardening said binder.  
   
   
       9 . A method according to  claim 8 , wherein said hollow fine particles are inorganic hollow fine particles.  
   
   
       10 . A method according to  claim 9 , wherein said inorganic hollow fine particles are hollow fine ceramic particles.  
   
   
       11 . A method according to  claim 1 , wherein said pigment has a solar radiation reflectance defined by JIS A 5759 of not less than 15% and an L*value in CIE 1976 L*a*b* color space of not larger than 30.  
   
   
       12 . A method according to  claim 8 , wherein said coating composition further comprising, in addition to said pigment, at least one colored pigment having a solar radiation reflectance defined by JIS A 5759 of not less than 12% and, if necessary, a white pigment.  
   
   
       13 . A method according to  claim 8 , the amount of said hollow fine particles and/or said pigment which absorbs solar heat in the visible wavelength region and reflects solar heat in the infrared wavelength region is an amount sufficient to substantially control a rise in temperature of the pavement surface caused by solar heat as compared with the case where said hollow fine particles and/or said pigment are (is) not used.  
   
   
       14 . A method according to  claim 8 , wherein said binder is selected from the group consisting of resin, asphalt, asphalt emulsion, and cement.  
   
   
       15 . A method according to  claim 8 , wherein said binder is a room temperature curing type radical crosslinking resin composition.  
   
   
       16 . A method according to  claim 15 , wherein said hollow fine particles and/or said pigment which absorbs solar heat in the visible wavelength region are incorporated in each of two solutions each constituting a room temperature curing type radical crosslinking resin composition and the resulting liquid compositions are sprayed onto the surface of the pavement with use of a spray gun.  
   
   
       17 . A pavement according to  claim 2 , wherein said pigment has a solar radiation reflectance defined by JIS A 5759 of not less than 15% and an L* value in CIE 1976 L*a*b* color space of not larger than 30.  
   
   
       18 . A pavement according to  claim 3 , wherein said pigment has a solar radiation reflectance defined by JIS A 5759 of not less than 15% and an L* value in CIE 1976 L*a*b* color space of not larger than 30.  
   
   
       19 . A pavement according to  claim 2 , further containing, in addition to said pigment, at least one colored pigment having a solar radiation reflectance defined by JIS A 5759 of not less than 12% and, if necessary, a white pigment.  
   
   
       20 . A pavement according to  claim 3 , further containing, in addition to said pigment, at least one colored pigment having a solar radiation reflectance defined by JIS A 5759 of not less than 12% and, if necessary, a white pigment.