US1634264A - Process por treating asphaltic paving materials - Google Patents

Description

Patented July 5, 1927.

UNITED STATES PETER J'. MOINEBNEY, OF DALLAS, TEXAS.

PROCESS FOR TREATING ASPHALTIC PAVING MATERIALS.

No Drawing.

Further, by the application of process, be shipped in open cars, at

the material may less expense.

Another advantage is that'the-a 'plication of my process to the material at't e source ofsupply of-the material, eliminates all-temporary mixing plants in proximity to each individual contract, and enables one mixing.

plant at the source of supply to supply numerous contracts.

Another feature. or advantage is-that the filler used in my process, the application of which to the as haltic material renders the latter more fria le,-is stored in vats at the source of supply and maintained at a degree of temperature (Fahrenheit) about twenty percent lower than the normal temperature, and is mixed by an even rapid application with the hot asphaltic material in a pug mill or other suitable agency when desired,

In substance, the asphaltic materials, after bein mixed in the customar manner, that is, with certain proportions o asphalt, stone and sand, and while still at a very hot temperature, say, from two hundred and fifty to three hundred and seventy five degrees Fahrenheit, has applied thereto simultaneousl over the entlre surface, a mixture of san and water or sand and Portland cement and water or sand and stone dust and water or sand and hydrated lime and water at a substantially lowered temperature.

This application literally blows the asphalt into a multitude of particles which are held in suspension by the use of the filler and remain in a semi-solid, plastic or friable state until the water evaporates or is vapor ized artificially.

Thus it will readily be comprehended that the amount of water used in the .fillerto gether with the atmospheric conditions as to temperature will determine the limit of distance and time consumed in transit before the evaporation of the water and the subsephaltic material to a Application filed July 8, 1925. Serial No. 41,429.

quent solidification of the material takes place.

When the material arrives at the contract and is laid onthe highway, pavement or othersurface whereon it is to be used, as it is laid it is raked with hot implements and a surface heater employed when necessary to complete the evaporation of the water before the resultant mass is rolled.

The temperature of the water and other ingredients making up the filler must be of a temperature low enough to balance the temperature of the asphaltic materials, so that the. latter may 'be successfully treated for shipment.

Ordinarily sand andwater are employed, but in the case of laying sheet pavements where a certain percentage of the materials are required to pass through a two hundred mesh screen, the Portland cement, stone dust, or hydrated lime mentioned above must be mixed with the cold Water and sand before. the filler is a plied to the apshaltic material, otherwise t e Portland cement, stone dust, or hydrated lime, if mixed with the.

In computing the percentage of asphalt used in the mix, the filler should be computed as art of the original mix.

What claim is:

1. The hereindescribed process of treating asphaltic aving materials comprised in applyin a filler of sand and water at a maintalne low temperature to asphaltic paving material at a correspondinglyhigh temperature, with a rapid and equally distributed application.

2. The process for rendering asphaltic material friable, by first heating said as tern erature ran 'ng d fif t from two hundred an y to three un- "d'rd and seventy five degrees Fahrenheit,

and by then applying thereto in even rapid distribution, a filler com rised of sahd and water at atemperature ow enou h to balance the temperature of the aspha tic material and to break up or reduce it to a state of friability. I

3. In preparing asphaltic paving materials for paving, the process of applying a cold filler com used 0 sand andwater, with the addition 0 Portland cement, stone dust,

or hydrated lime, thereto, to said asphaltic material, when the latter is in a hot, semiliquid state, in even, rapid distribution to all exposed surfaces of the asphaltic material.

4. A process whereby asphaltio paving material is rendered friable, by applying a filler at a maintained low temperature to the asphaltic material at a maintained'hightemperature, in an even rapid distribution to all ex osed surfaces of the asphaltic material.

11 testimony whereof, I have signed my name to this specification.

PETER J. MCINERNEY.