Road surfacing and method for manufacturing such road surfacing
AssigneeIFM Akustikbyran AB
InventorNils-Ake Nilsson
Life of this patent
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Abstract
A road surfacing (3) which emits reduced rolling noise and a method for the manufacture of such a road surfacing is disclosed. The road surfacing material is relatively soft and incorporates air-permeable, preferably intercommunicating channels or pores. In the manufacture of the surfacing, granulate or chip particles (4) are bound so that channels or pores are formed between the particles.
Claims4
Road surfacing comprising polymeric particles bound together by a binder but having intercommunicating airpermeable spaces therebetween, said bound particles forming a porous road surface having (1) a material Youngs Modulus in compression and tension not exceeding 7 MPa;
- and, (2) a flow resistance therethrough not greater than 200.multidot.10.sup.3 MKS Rayls/m, said binder having a Youngs Modulus and a relaxation time which do not deviate from the Youngs Modulus and relaxation time of said particles by more than a factor of 5 raised to the .+-.1 power.
A method of making a road surfacing material comprising the steps of:
- granulating polymeric particles;
- binding said polymeric particles together with a binder so that intercommunicating, air-permeable spaces are formed between said particles, thereby forming road surfacing material having (1) a material Youngs Modulus in compression and tension not exceeding 7 MPa, and (2) a flow resistance therethrough not greater than 200.multidot.10.sup.3 MKS Rayls/m, said binder having a Youngs Modulus and a relaxation time which do not deviate from the Youngs Modulus and relaxation time of said particles by more than a factor of 5 raised to the .+-. power.
Dependencies are inferred from the claim text.