US1800193A

US1800193A - Asphalt expansion joint

Info

Publication number: US1800193A
Authority: US
Publication date: 1931-04-07
Anticipated expiration: 1948-04-07

Description

Patented Apr. 7, 1931 1. NITED STATES PATENT oFFicl:

ALBERT C. FISCHER, F CHICAGO, ILLINOIS, ASSIGNOR TO THE PHILIP CAREY MANU- FACTURING COMIPANY, A CORPORATION OF OHIO y ASPHALT EXPANSION OINT Application mea :my 2s, 1922. serial No. stair?.l

This invention relates to an improvement in asphaltic expansion joints for concrete pavements. Heretofore it has been customary to use dusting material upon the sides of 5 asphalt expansion joints to prevent the sides sticking to one -another in packing. Later it was found advantageous to coat one of the sides with a layer of saturated felt squeezed dry. This was followed by coating the sides with open meshed burlap, and was later followed by using felt sides on both sides of the asphalt materials, the purpose being to make the joint easier to handle on the part ofthe contractor.

Tale, bone dust and other'substances used as dusting materials soon become penetrated by the asphaltic material, and, therefore, do not bind with the concrete in the roadwhen poured against the sides. Likewise the saturated felt by reason of its aterproof nature does not permit ofadhesion to the concrete sides when the moist batch of concrete is poured up against it, and consequently there is no true adhesion.

In the accompanying drawings :-l

Fig. 1 is a section of expansion joint strip embodying my invention; and

Fi 2 is a section of pavin in which the nove expansion joint strip is inserted.

dusting materials and apply them on the sides of the asphaltic body in such a manner that they not only prevent the joints from adherin' to each other in the crates, but by using -aind-in means the dusting particles are united as w en dusted upon the asphaltic body, and are ,constituted of4 materials which 'readily unite with the concrete mass, so that when the concrete batch is poured up against 40 the sides' of the expansion joint it becomes one cohesive whole, and the particles on the side become a part of the concrete mass.

The proper method of accomplishin this result is by coating the sides of the 'as altic mass with a layer of adhesive material. It may be performed in various ways. For instanceya layer of silicate of soda in the nature of a very thin film 3 may be prepared and coated over the `sides of the asphaltic body 5o 2,01` other substances may be mixed, such as,

The purpose of this invention .is to furnishsilicate of soda and calcium chloride, which will furnish a waterproof substance as a binder. Likewise, avery high melting point asphalt may be ucsd as the binding means, which cools quickly when heat is removed.

,Into this binding material is dusted preferably such substances 4 as short asbestos libre,

of the asphaltic mass, which prevents ad hesion of the joints when packed in crates, and likewise a film whhrich when a concrete mixture is poured up against it readily'sets with they concrete, becoming a part of the concrete slabs 5, and by reason of its previous adhesion to the asphaltic slab becoming one uniform mass.

'I claim 1. An ex ansion joint for concrete pave-Y ments, consistin of a body containin a substantial proportlon of bituminous sustan, having a form which adapts it to serveA as a division wall in moldingconcrete pavement, and having upon its surface throu h which it receives poured concrete, a bin 'ng material consisting of subdivided ibrous materia-l adhered to the body portion b a cement that is adhesive to it as well as to t e bituminous material of the. body, but leaving un# covered by the bituminous substances and exposed an outer surface which enters into bond*4 with the water mixed concrete when poured against it.

"2. A bituminous expansion joint havin coated upon its sides a binding material hesive to 4bituminous substance and having dusted upon said binding material a bonding material in subdivided form, which is adhesive both as to the binding material and water mixed concrete when poured against it.

3. A bituminous ex anslon joint having coated upon its sides a inding material comprising sodium silicate adhesive to bitumi- 109 nous substance and having dusted upon said binding material a bonding material adhesive both as to the binding material and Water mixed concrete when poured against it; said bonding material consisting of a fibrous substance distributed upon the binding material while the substance is in subdivided form, thereby causing the fibers to be intimately interwoven.

4. An article of manufacture composed of a body of bituminous material having a coating film on its surface which is normally nonadhesive but capable of becoming adhesive in the presence of water, and granular material partiallyembedded in the coating film to prov vide projecting uncoated areas.

5. An article of'manufacture composed of a body of bituminous material having a coat- 'ing lm of sodium silicate.

6. An expansion joint composed of a body of bituminousrmaterial having an adhesive coating on its surface, and grandular material partially embedded in said coating to provide a rough uncoated surface area adapted to bond with adjacent plastic material.

7. A paving structure comprising concrete slabs and interposed expansion joint strips, said strips being composed of a bituminous slab coated upon its sides, with a binding material adhesive to a bituminous substance and having dusted upon said binding material a bonding material in subdivided form, which is adhesive both as to the binding material and adjacent Water-mixed concrete.

8. A paving structure comprising concrete slabs and interposed expansion joint strips, said strips composed of a bodyl of bituminous material having an adhesive coating on its surface, and granular material partially em` bedded in said coatin to provide a rou h uncoated surface area a opted to bond IWlth adjv jacent plastic material. Signed at Chicago, illinois, this 24th day vof July, A., D. 1922.

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