US768699A - Process of laying pavements. - Google Patents

Description

Patented August 30, 1904.

Tr ce.

PAT NT AUGUST E. SOHUTTE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO WVARREN BROTHERS COMPANY OF CHARLESTON, WEST VIRGINIA, A CORPORATION OF WVEST VIRGINIA, OF BOSTON, MASSACHUSETTS.

PROCESS OF LAYING PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. 768,699, dated August 30, 1904.

Application filed August 21, 1902. Serial No. 120,576. (No specimens.)

To all whom it near concern.-

ing taken out my first naturalization papersas a citizen of the United States, residingin Cambridge, in the county of Middlesex and State'of Massachusetts, have invented a new and useful Process of Laying Pavements of That Class Known as Bituminous Macadam, of which the following is a specification.

The bituminous macadam is a pavement now generally well known, and consists of a mixture of coarse stone and bitumen upon a suitable foundation. The stony ingredients roughly interlock, and the voids or interstices between the same contain a bituminous cement or binder for holding the stones in position.

In the manufacture of bituminous macadam pavements or roadways of such character it is desirable that the binding-cement shall very closely fill the voids between the stone which forms the body of the roadway. As a means for accomplishing this result I have devised the following process These roadways are ordinarily laid upon a foundation of some kind. While the foundation forms no part of my present invention and may be of any desired character, I prefer 'to have such foundation made of a layer of coarse cracked stone coated with a hard bituminous cement which shall serve as a binder, so that when the foundation is rolled firmly in place it shall so remain. In making a roadway by my improvement upon a foundation either so or otherwise constructed I laya soft matrix say from one tooneand a half inches thick-preferably produced from bituminous cement, -so called, mixed with fine sand and stone-say from about one-fourth of an inch in diameter to the finest dust. This matrix is spread to a thickness in proportion to the thickness of the pavement desired; Upon this matrix while still hot is placed a layer of the larger stone of about one and a half inches in diameter, preferably already coated with bituminous cement and in a heated condition. These stones are then rolled by a heavy roller or otherwise embedded in the matrix, which is caused by the rolling or embedding process to receive the stone and ooze up between the stones, so that the stone is thoroughly embedded in the matrix. All the voids are thus filled, and perhaps a light coating or surfacing is formed for the roadway. This coating may be sufficient to form the finishing-surface of the roadway. If desired, however, an additional thin finishing-coat of some proper characterfor example, any one of the finishingcoatings now in use which will combine with the matrix and stone surfacingmay 'be laid upon the roadway so constructed.

This process is simple and easy to carry out and forms a firm, hard, .and elastic roadway well fitted for all the ordinary uses of travel.

What I claim as myinvention is 1. That process of making a bituminous macadam roadway which consists in laying a matrix of the character described upon a suitable foundation and pressing into it a layer of coarse stone whereby said stone will be em bedded in the matrix and the matrix will fill the voids between the stones as described.

2. That improvement in the art of making bituminous macadam roadways which consists in forming a foundation of crushed stone or the like, laying thereon a matrix composed of bituminous cement, sand and small stone and then embedding in said matrix a layer of coarse stone as set forth.

3. That improvement in the art of making bituminous macadam roadways which consists in laying upon a suitable foundation a matrix composed of bituminous cement or the like mixed with fine sand and small stone, embedding in said matrix by pressure larger stone whereby said matrix will be caused to fill the voids between said larger stone, and adding thereto a finishing-coating as and for the purposes described.

4:. That improvement in the art of making bituminous macadam roadways which consists in laying upon a suitable foundation a matrix made from small stone, sand and a bituminous cement and adding thereto a layer of coarse stone coated with bituminous cement whi'le hot and embedding said coarse stone in said matrix by pressure as and for the purposes described.

5. That process of making a bituminous macadam roadway which consists in laying a matrix to a predetermined depth upon a suitable foundation then applying to the top thereof such a layer of selected stone that upon subsequent rolling, the stone is forced into the matrix to form a bituminous macadam mixture, then applying such pressure on the surface as to accomplish the desired results.

6. That process of making a bituminous i'nz'icadan'i roadway Which consists in laying a matrix to the depth of about one to one and one-half inches upon a suitable foundation then applying to the top of such matrix a layer of stone of sizes of approximately one and on ehalf inches, and applying such pressure on the surface as to force the stone through the matrix.

7. That process of making a bituminous macadam roadway which consists in placing upon a suitable foundation a layer of matrix, placing upon such matrix, coarse uneven stones such as Will interlock With each other upon being subjected to pressure, and then pressing such'stones together and into the matrix, and into closely interlocking relation to each other.

8. That process of making a bituminous macadam roadway Which consists "in placing upon a suitable foundation a layer of matrix substantially as described, placing stone upon the surface of such matrix and then forcing such stones in the matrix and into an interlocking contact With each other in such a Way that the matrix fills the voids between the stones.

AUGUST E. SOHUTTE.

Witnesses:

M. D. NEWMAN,

SAUL Srrrnnsrnm.