US1779955A

US1779955A - Nonskid paving surface construction

Info

Publication number: US1779955A
Application number: US209179A
Authority: US
Inventors: Ernest A Young
Original assignee: UVALDE ROCK ASPHALT Co
Current assignee: UVALDE ROCK ASPHALT Co
Priority date: 1927-07-28
Filing date: 1927-07-28
Publication date: 1930-10-28
Anticipated expiration: 1947-10-28

Description

Patented Oct. 28, 1930 'umrsosrarss PATENT oFFics ERNEST A. YOUNG, OF SAN ANTONIO, TEIMS, ASSIGNOR T0 U VAIlLDE ROCK ASPHALT COMPANY, OF SAN ANTONIO, TEXAS, A CORPORATION OF 'IJFJLBLS NONSKID PAVING SURFACE CON STRUC'IION Ho Drawing. Application filed July 28,

This invention relates to a new and improved paving construction and more particularly to a. pavement which 18 provided with means for preventing skidding and giv- 5 ing a firm traction surface.

In its specific form my invention relates to a pavement, the body of which is formed of 29 crushing and grading it and then treating it with a flux such as an asphaltic oil or a paraffine base oil. in some methods of preparation a the rock is heated, while by other methods the mixture is made with the materials cold. In

- some cases a solvent such as kerosene-is also added to delay the setting of the mixture, this being more generally used with the cold mixed material. Thisrock asphalt when so treated, is spread out on a suitable base and compact- 39 ed by means of a road roller or the like. When so treated a dense smooth surface is formed whichjis substantially impervious to water and which is very wear-resisting under normal road trafic. Such a surface, however 5 at times becomes quite slippery when wet or when an excess of the has is brought to the surface by heat. @n steep slopes this surface does not ahord adequate traction under such conditions. i I

It is an object of the present invention to provide a new and improved pavement and method laying the same which aiiords an adequate traction eifect under all conditions. it is a further object to provide such road surface base of which is roci: asphalt or the like, and which he commerci lly produced by usual methods.

lt is an additional object to provide a construct-ion of this character in which the trac- 59 tion effect is provided by means or appii 182?. Serial No. 209 17 9.

cation of crushed stone or the like harder than the rock asphalt base.

' Other and further objects will appear as the description proceeds.

According to the present invention rock asphalt may be made into a suitable road forming mix by any one of the methods well known in the art. When so treatedthe asphalt is laid upon the prepared base and spread in a substantially uniform layer or in such a layer .as to give a substantially smooth surfacewhen compacted. it will be understood that'this rock asphalt mix when so laid is substantially balanced as to size; that is, the larger-and smaller particles are so sized and proportioned as to provide a minimum of voids. After this material is spread a layer of crushed ,stone is scattered over the first layer or rock asphalt. This crushed stone is preferably considerably harderthan the rock asphalt so that it tends to crush the asphalt wheir' forced into it by the compacting rolrer.

The crushed rock is also preferably not balanced as to size and in the preferred construe tion the crushed rock is substantially a onesized material. A satisfactory size for the crushed rock has been tially the size of the coarser rock asphalt aggregate in the rock asphalt layer. After the crushed rock has been scattered the entire mass is thoroughly compacted by means of a road roller or the like.

Under some circumstances it may be found advisable to coat the crushed stone with fluid asphaltic material or with the same material which is used as a flux in forming the rock asphalt base. This coating enables the crushed rock to be more quickly consolidated into an integral mass with the rock asphalt, particularly if the rock asphalt min has little excess asphaltic' material.

it will be understood t at the specific de tails given are by way of illustration only as various types of material may be used as a base and difierent sizes and kinds of non-skid surface material may be used. 1 contemplate such changes'and modifications as come within the spirit and scope of the appended claims.

found to be substan I claim:

1. The method of laying a pavement or the like which comprises spreading a loose layer of crushed asphalt rock,'said rock being sized and proportioned to give a balanced mixture with a minimum of voids, spreading on said first layerascattered layer of crushed stone harder than the first layer and compacting the layers together. i

. 2. The'method of laying a pavement or the like which comprises spreadinga looselayer of crushed asphalt rock, said rock being sized and proportioned to give a balanced mixture with a minimum of voids, spreading on said first layer a scattered layer of crushed stone harder than the first layer, said crushed stone bein a one-sized aggregate substantially the size of the coarser rock asphalt aggregate, and compacting the layers together.

3; The method of laying a pavement or the like which comprises spreading a loose layer of crushed asphalt rock, spreading on said first layer a layer of crushed stone harder than the first layer, said crushed stone having been coated with a relatively fluid asphaltic material, and compacting the layers toget er.

4. The method of laying a pavement or the.

like which comprises spreading a loose layer of crushed asphalt rock, said rock being sized and proportioned to give a balanced mixture with a minimum of voids, spreading on said first layer a scattered layer ofcrushed stone harder than the first layer, said crushed stone being a one-sized aggregate substantially the size of the coarser rock asphalt aggregate, and being coated with fluid asphaltic material and compacting the layers together.

5. The method of laying a pavement or the like which comprises spreading a loose layer of crushed rock asphalt mixed with a iiuz'z, spreading on said first layer a layer of crushed stone harder than the first layer andcompacting the layers together.

6. The method of laying a pavement or the like which comprises spreading loose lay of crushed rocir asphalt mixed a r spreading on said first layer layer crushed. stone harder than the first layer and compacting the layers together, crushed stone having been treated with the same as rock asphalt.

7. The method ofslaying a pavement or the like which comprises spreading loose layer of crushed rock asphalt mixed with a said rock being sized and proportioned togive a balanced mixture with a minimzini of voids,

spreading on said first layer a layer at crushed stone harder than the first layer compacting the layers together.

8. A non-skid pavement construction comprising a compacted body crushed rock asphalt balanced as to size and with a minimum of voids and scattered crushed rockharder than the asphalt reel: embedded in the upper surface of the body.

of July, 1927.

91A non-skid pavement constructioncomprising a com acted body of crushed rock asphalt and a ux and scattered crushed rock harder than the asphalt rock embedded in the upper surface of the body and adhering to the rock asphalt body by means of the flux and the asphalt. Signed at San Antonio, Texas, this 2nd day ERNEST YOUNG.