US1195273A - Kinkted statei - Google Patents

Description

rrsn sa aaasgann'r OFFICE.

Jo'sizPH scHEssn-s. or SAN FnAircIsco, CALIFORNIA.

fs'rmnT-P VEMENT A m '-TH-E METHCD F CONSTRUICV'ITINIGL'YQHE lgnown that I, Josnrir Sennsnsn, a

(:1 rzen of the United 'States, a resident Q =.the city and, county of San Francisco,

-.- State of California, have invented certain newand useful Improvements in Street- 'Pa emfents and the Method of Constructing Same, .of wh ich the following is a specifieate ,1 l ache invention relates to street pavements employing asphalt or similar i'ua'terialas a hinderiand particularly to the wearing or topisurfaceiof street pavements.v

The object of the inyention to provide 1:5 ajstreet pave-mentwhich will nothecome smooth itndg slippery under. serv, i

@Anotherobject of the invention is to pro-- videastreetpave nent which possesses c0mparative permanency and stability.

furthe nobject of the invention is a) providea method ofl'aying a earing surface 'uponxotherpavements. I

Theinvention.i-"possesses other, advantageous features which; with the foregoing, Will'be setfort'h at length in the following description 'l' ere outline in full that ition-which I-hare selected 1 'de'seripti-onherein. The novelty the invention will be included in the cl aims sucb eeding said description. thisit will be apparent that 1-- do not limit myself the "showing madeby said 'de 'wiption I may adopt many"y'ariationswi i n of my invention forth in. said 5 Asphalt and similar pm" soon he some very smooth and in ervice,

dueto automol'iile trallic and the lubr cating oil' dropped by? the countless 'autoinoli iles passing over'and standing on'the pavement. The lubricating'oil unites iy'itlrthe asphalt a produces aharcl snr-face ,hich become. "ye'ry smooth due tothe travel of rnhb r tired ysfh'eels, producing a ery dangerous pa einenhcy 'en in dry eather- In wet 1 .ther, thefsurfacefof the pavement h uses no slick that the driving of automoou thereover fbecoines dangerous and the .dririn of horses impossible. v i

.. [The pavement of tiny invention is of such character-'that'it presents an even surface to trallic, but is not affected by lubricating oils and does-not wear smooth and slippery, affording at all times and in all conditions of weather a perfect tractivc surface. The

pavement of my invention, which constitutes the Wearing surface, may be applied as a" covering to smooth and dangerous asphalt pavements or to macadamized,-:o11ed,"bricic, I granite, cement, slag, or basalt pay e'm'ents.

which comes up fromlt'he'old Ii men th harder when cool.. The percentage oft'liese i Specification of'Lettcrsfatent. umn 'aaia Septcinlier 15,1913. serial No. 739,908,

My invention relates to,. the"wearing so '1 face of the pavement and any s'uita-ble 1or available foundation o rrbase' therefor?maybe used, although I prefer to lay it over an asphalt pavement. g

The old pavement or Easels first cleaned in a suitable manner, andwhen it happens to be an asphaltpai'emengit is preferably,

though not necessarilyfheated tosoften the asphalt and reinove someiof the' lubricatirig oil therefrom. The pavement is then given a. coating,'preferably a brush or spraycoat of hot liquid asphaltum,wliichlacts 'prir'icr" pally to hind the top surfaeeto the old pave; ment. This asphal'thnrcoefiiiiQk the'n eoy-f ered. by a coating, prefera "lya brush or '75 spray coat of an asphalt compound or mixr; ture. This mixture consists :cr hotfliquid' asohalt containing ground lime r0 laste'r Y ofliaris, pumice stone, diatom ous earthf'orground slag. Itisfno't'ie 'n .hafallofitiothese materials be" used niiiitureias several of those in'entione haveljequii'alent functions. The pumicesto diato'xnace earth and-slag absorb the lubricating oil" plaster of Paris causesthe asphalt; to hedornie still when-cold and rawns-enhancer: ing materially under-pressure'a'nd the linie' stone acts as a filler to niiakeithe nii-Xtiir;set':

materials in the mixture ayb arigd* de pending'upon the base andlthe road conditions to 'be niet. 'Oi-er this cost Pplace a mineral aggregateicomposed principally of hrokenhard rock and limestone? F or thiss purpose I prefer -to use crushedliasalt or granite and lime stone in theproportion. of approximately fifty per c'e t. of each. This aggregate consists preferablyiof from (to, .175 per cent. of rock which \ij'illpasfs through a inch ring-but i" llheretained by a q1iar-. terincli ring'and" from QSitQAOp ercent; of rock which will pass through a quarter-inch. ring and he retained by an. eighthin ring. This aggrcgateis lieatediandf is distributed 105 over the second asphaltcoat in a, layer, preferahly one half or three'quarters of an. inch thick. The aggregate is theh' rolledlwith, a light hot'rollerz. The heated rockshecoine embedded in thc'a sph'alt. coatings; \frhielrare ressed upward into the interstices between; the aggregate binding tliesa1ne, .lir1nly together. \Yhcn' this surface is applied to an old asphalt pavement, soxnc'of the asphalt ofthe old pavement which is softened-by the heat is also forced upward between the pieces of the aggregate. The aggregate may also contain a small proportion of the oxids of iron and manganese which act as a flux to bind the rock and the asphalt to produce a. homogeneous mass. The asphaltenters the pores of the lime stone and forms a very rm bond therewith and the, rough and jagged condition of the'constituent parts of the aggregate also assists in forming a tight bond.- The material of the aggregate should be as free from clay as possible, since the presence of. clay will produce a slippery pavement. After rolling with the light roller, I apply a top dressing of about eth inch 'pieces of aggregate consisting of crushed hard rock such as basalt or granite, lime rock and pumice stone, which fills up the larger voids on the upper surface. This is then rolled with a heavy steam roller, the roller of which is preferably heated and -the increase in pressure compacts the aggregate more closely, forcing some of the asphalt up and thereby binding the top dressing in place. The lime rock in the top dressing is adhered to very strongly by the asphalt producing a very stable pavement and the pumice stone is present to absorb aofthe lubricatingoil which subsequently falls on the pavement. The finished pavement presents a substantiallysmooth, hard sur I face having innumerable small depressions longitudinally therein is provided for the -distribution of the hot liquid asphalt.

Behind this conductor is a similar one for dis tributing the asphalt mixture on the asphalt coat and behind this is a rotating screen or shuttle or other device for depositing the agegate.

I claim: I

1. In a street pavement, an asphaltic min eral structure composed of crushed hard rock, lime stone, an oil absorbing stone andan asphaltic binder.

2. In a street pavement, an asphaltic mineral structure composed of crushed hard rock, -lime' stone, 'pumice stone. and an' asphaltic binder.

3. A street pavement comprising a rigid foundation, a coatin'gff of asphalt on said foundation, a coating of asphalt mixture"- consisting of asphalt, ground lime stone, ground oil absorbing stone and an asphaltic binder on said asphalt'coating, and a layer of mineral aggregate of small sizes and free from clay on said asphalt mixture, the aggregate being rolled to force the asphaltupward'into the interstices of the aggregate.

4. In a street pavement, a wearing surface containing crushed lime stone, pumice stone and a binder. V p

'5. The method of constructing a wearing surface on a road foundation which consists in applying a coat of hot liquid asphalt, then applying a coat of a hot liquid asphalt mixture consisting of asphalt, ground lime stone, ground oil absorbin'g'stone and an asphaltic binder, then applying a .layer of hot crushed mineral aggregate. and-then I rolling the mass with a hot roller.

6. The method of constructinga wearing surface on a road foundation whichconsists in applying a coat. of hot liquid asphalt, then applying a coat of an asphalt mixture containing -st ffening andoil absorbing mediums and afiller, then applying a layer of hot crushed mineral aggregate, the separate pieces of which will pass through a three- ,eighths inch ring, then rolling: the mass with a hot roller to force the asphalt upward into the interstices in the aggregate.

.7. Themethod of constructingawearing surface on a road foundation which consists in applying a coat of hot liquid asphalt,

then applying a coat of hotliquid asphalt containingplaster of Paris, then applying a layer of crushed mineral aggregate containing lime stone, then rolling the mass, then applying a top'dressing of fine mineral avggregate containing an oil absorbing mineral and then rolling the 1nass with: a heavy roller.

8. The method of constructing a wearing surface on old asphalt. pavements which consists in heating the surface of' the old pavement, applying a coat of, hot liquid asphalt thereto, then applying a coat of hot liquid asphalt containing plaster ofIaris,

then applying a layer of hot mineral aggre gate free from clay and containing lime stone, then rolling the mass with a hot roller, then applying a top dressing of fine mineral aggregate free from clay and containing,

lime stone and pumice stone, and then rolling the mass with aheavy roller;

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 8th day of September, 1913.

JOSEPH SGHEERER. In presence of H. G. PRosT, M. LE CONTE.

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