MXPA99009455A - Cementador for pavements of modified asphalt with cau - Google Patents

Abstract

The present invention relates to an improved cementitious for rubber-modified asphalt pavements comprising from about 80% to 99% by weight of asphalt cement, from 0.5% to 20% by weight of rubber crumb and from 0.01% to 10% by weight of polyoctenamer. In a preferred embodiment of the invention, the modified asphalt commentator for paving is comprised of 80% to 95% of the asphalt cement, 2% to 15% of the rubber crumb and 0.2% to 5% of the polyoctenamer. It has been found that the above objectives and other advantages are achieved by incorporating a minimum ratio of a polyoctenamer to the heated liquid asphalt cement. The polyoctenamer is added in the form of dried particles to the melted asphalt cement at a temperature of about 32 SOF, the mixture being whipped or otherwise agitated (as by recirculation pumps) until the polyoctenamer is dissolved and mixed thoroughly. The rubber lump can be added to the hot asphalt cement with the polyoctenamer granules or after the polyoctenamer granules have been dispersed and before or after they have melted and mixed

Description

CEMENTADOR FOR PAVEMENTS OF MODIFIED ASPHALT WITH RUBBER Field of the Invention The invention relates to compositions for asphalt pavements, or bitumen, which are modified by the addition of rubber and particularly rubber crumb, such as rubber from discarded crushed tires. BACKGROUND OF THE INVENTION Conventional asphalt cement (CA) produced by an oil refinery must be modified to improve its qualities as a cementing agent. The asphalt cement derived from oil refining is a mixture of hydrocarbons and heterocyclic compounds, including asphaltenes and maltenes formed from polynuclear hydrocarbons of relatively high molecular weight. The asphalt varies depending on its source, that is, the crude oil and the refinery. An asphalt cement is defined as the substance used to hold together the arid particles, for example, crushed rocks, stone, inert materials, etc., and thereby form the concrete asphalt. Various modifiers for commercial use have been developed and adopted in an effort to improve performance and extend the life of asphalt pavement compositions. A class of material that has been added to hot asphalt are polymer modifiers. A commonly used polymer that is added to the asphalt at high temperature is the styrene-butadiene-styrene block copolymer (EBE) in a range that is usually less than 10% by weight of the asphalt cement mix. Although certain physical properties and performance characteristics of the applied asphalt concrete are improved, the use of EBE has several disadvantages, including insolubility in the asphalt and which is separated and raised to the top of the asphalt during storage. unless the mixture is subjected to the proper type of mixing in a continuous base. When used with GTR, the mixture of asphalt and EBE is subject to an increase in viscosity during storage. Another disadvantage with respect to the use of EBE as a modifier is that the relatively higher levels of the polymer are required to achieve the same level of improvement in the classification of the asphalt cementing test ("PG") of the Highway Research Program. Strategic (PIAE) federally established. Polypropylene has also been used commercially as a modifier, but like EBE, this material does not form a pure solution with the asphalt and if the mechanical agitation and / or recirculation of the mixture is discontinued or falls below a certain level, the additive polymer will separate to form a separate layer on the surface of the hot asphalt in the processing equipment. Another polymeric material that has been suggested for use as an asphalt modifier is styrene butadiene rubber (CEB). However, the asphalt containing CEB produces a composition having relatively high tackiness which causes an undesirable accumulation of the material in stretches, hoppers, shovels and scrapers of the paving machines. This effect also manifests itself as an absorption on the surface of the roller equipment when the hot concrete is being finished on the road surface which can only be attenuated by allowing the asphalt to cool to less than about 150 ° F before being rammed . In addition, concrete for finished pavements has a greater tendency to develop "cobwebs", or fine surface cracks, under certain climatic conditions. It has been revealed that other polymers, including terpolymers with properties such as rubber, are useful as asphalt modifiers. For example, U.S. Patent 5,733,955 discloses the addition of a polymer with properties such as rubber as a modifier consisting of a conjugated diolefin monomer, an aromatic vinyl monomer and isobutoxymethyl acrylamide which form the backbone of the polymer. In the U.S. Patent there is disclosed an asphalt modifier which is a mixture of sulfur and a polymer consisting of a linear copolymer which is a block copolymer of conjugated diene of styrene and a similar linear copolymer of specified molecular weight. It does not appear that these or other polymeric modifiers have been adopted for use by commercial paving contractors. A material that has been adopted for use as an asphalt cement modifier is rubber crumb. The main source of rubber crumb in the United States and elsewhere around the world is scrapped tire rubber (CLLT). The Federal Highway Administration of the United States (FHWA) has approved the rubber crumb produced from tire waste for use on highway pavements as a modifier for asphalt cement. The use of rubber crumb as a modifier for asphalt cement in place of other "virgin" polymeric modifiers has been hailed by some as a solution to the growing problem of getting rid of discarded tires in an ecologically acceptable and economical manner. The rubber crumb, or CTLL, of different particle sizes has been incorporated into hot asphalt cement, although 40 mesh or smaller materials with relatively small particle size are preferred. Two basic types of rubber crumb are available and are identified by the processes for their respective manufacture. The cryogenic CTLL is produced by grinding the tire into relatively large pieces and then subjecting the rubber to grinding under cryogenic conditions. Tire rubber crushed at room temperature or hot is produced under non-cryogenic conditions. The cryogenic CTLL presents a certain regularity of shape when examined by scanning electron microscopy (SEM) techniques and reveals particles having generally flat surfaces of relatively low surface area, as would be expected from the fracture of the cryogenically frozen crystalline tire rubber. In contrast, tire rubber particles crushed at room temperature are irregular in appearance with extended earwires resulting from the separation and grinding of the rubber structure (as compared to the cryogenic fracture) and have a much higher surface area compared to the particles produced by the cryogenic process. The use of CTLL as a modifier for asphalt cement that is used as a cementing agent in paving compositions provides several advantages, including a more resilient road surface that bends under the force of vehicular traffic to disintegrate thin sheets of ice during his training. The road surface is also darker and therefore absorbs more of the radiant energy of the sun to melt the accumulating ice and to dry a wet surface more quickly. The addition of CTLL also provides improved skid resistance. However, there are limited opportunities for a chemical bond to form between the asphaltenes and maltenes and the rubber particles and it is difficult to uniformly disperse the CTLL in the asphalt cement. As a result of these chemical and physical limitations, the finished pavement containing CTLL is still subject to lane formation under continuous traffic and / or heavy loads and also to shoveling in areas of braking and rapid acceleration. Therefore, an object of the present invention is to provide an improved cementitious for rubber modified asphalt pavements that improves the performance characteristics of compositions for asphalt pavements containing rubber crumb or CTLL. Another object of the invention is to provide an improved process for the manufacture of cementing machines for rubber modified asphalt pavements. Also an important object of the invention is to provide an improved process and composition for road pavements that encourage the widespread adoption and use of discarded shredded tire rubber and therefore improve the recycling of scrapped tires to solve a serious environmental and ecological problem in the United States and in another part of the world. Another object of the invention is to provide an improved composition for rubber-modified asphalt pavements that can be produced in existing asphalt mixing equipment and paving machines. Another object of the invention is to provide an asphalt cement having improved properties due to the degradation that produces an excellent concrete asphalt when applied to poorly prepared sub-floors. Another object of the invention is to provide an improved cementitious for rubber modified asphalt pavements employing commercially available polymer modifiers and which is more economical to produce and apply than currently used polymeric modifiers and additives. SUMMARY OF THE INVENTION In accordance with the invention, an improved cementitious for rubber-modified asphalt pavements consists of approximately 80% to 99% by weight of asphalt cement, from 0.5% to 20% by weight of rubber crumb and from 0.01% to 10% by weight of polyoctenamer. In a preferred embodiment of the invention, the modified asphalt cement for paving is composed of 80% to 95% of the asphalt cement, from 2% to 15% of the rubber lump and from 0.2% to 5% of the polyoctenamer. It has been found that the above objectives and other advantages are achieved by incorporating a minimum ratio of a polyoctenamer to the heated liquid asphalt cement. The polyoctenamer is added in the form of dried particles to the melted asphalt cement at a temperature of about 325 ° F, the mixture being whipped or otherwise agitated (as by recirculation pumps) until the polyoctenamer is dissolved and mixed thoroughly. The rubber lump may be added to the hot asphalt cement with the polyoctenamer granules or after the polyoctenamer granules have been dispersed and before or after they have been melted and mixed. The polyoctenamer is a cyclic macromolecule having a crystalline structure exhibiting little viscosity above its melting point. The macromolecule has a high proportion of double bonds which allows degradation and provides a polymer with properties such as rubber. And what is more important, when the polyoctenamer is melted, it has a viscosity and adherence comparable with honey. These properties of the melted material help in the mixing of the CTLL in the asphalt cement. Its large number of double bonds allows the polyoctenamer to react with the available sites, for example, the sulfur of the asphalt ingredients and particularly the asphaltenes and maltenes, while leaving a large number of sites available for reaction with the sulfur in the surface of the CTLL or rubber crumb that forms the other main component of the cementing composition. Once it is cooled and degraded, the polyoctenamer has no tackiness and reduces the tackiness of the CTLL / asphalt cement, therefore there is little absorption of asphalt from the road surface allowing the road to be rammed long before and when it is still hot . A suitable polyoctenamer is available from Hüls AG of Mari, Germany and through its distributor in the United States, Creanova Inc. of Somerset, New Jersey, under the trademark VESTENAMER®. The preferred form of the polyoctenamer is trans-polyoctenamer, which is also known as "trans-octenomer rubber" (CTO). Two classes of the trans-polyethanomer VESTENAMER® are commercially available: "8012" identifies a material having a trans content of about 80% (and a cis content of 20%) with a melting point of about 129 ° F / 54 ° C; and 6213 having a trans content of about 60% (cis content of 40%) with a melting point of about 86 ° F / 30 ° C. But these polymers have a double bond in every eighth carbon atom in the ring. The preferred form of the CTO for use in the practice of the invention has a trans content of about 80%. However, compounds having other ratios of cis-isomeric and trans-isomeric forms of the polyoctenamer can also be obtained by combining products available for use in the invention. Compounds of this kind can be produced in accordance with the teaching of United States Patent 3,804,803. In a preferred embodiment of the invention, the CTLL and the polyoctenamer are added to the hot liquefied asphalt (CA) cement that is maintained at a temperature in the range of about 280 ° F to 350 ° F. The preferred temperature is around 320 ° F to 350 ° F and will depend on the qualities and characteristics of the asphalt cement, which, as previously explained, may vary with the source. In a preferred embodiment, the asphalt cement and the CTLL are maintained in the established temperature range until a homogeneous composition is obtained. In many existing field installations, the ezcia is often provided by one or more recirculation pumps in the AC heating tank. In a more preferred embodiment of the process, mixing is by low shear rotating blades, paddles or the like which result in a more even distribution of the dry and wet materials in the viscous asphalt cement. The mixture is continuous for about 30 minutes to about two hours. During the mixing, the polyoctenamer is melted and the double bonds begin to react with the sulfur in the asphalt cement and the sulfur on the surface of the CTLL. In view of this surface effect, it is convenient to provide the CTLL in a form having a surface area as high as possible.

After the CA and CTLL or other rubber crumb have been mixed, the polyoctenamer is added and mixing is continued. In the preferred practice of the invention, the CTLL is added by distributing the free flowing material in the CA while the CA is being circulated and / or otherwise mixed to facilitate the coating of the CTLL particles by the asphalt cement. Then, the polyoctenamer is also added in a dry form and the mixing continues as the material dissolves to form a solution with the CA. In this manner, the double bonds of the polyoctenamer will react with, and degrade, the sulfur and other reactive sites on the surface of the CTLL. Thus, as currently understood, the process and the composition of the invention provide an excellent asphalt cementing agent improving the degradation of asphaltenes and other reactive sites of the CA with those of the CTLL by means of the large numbers of double bonds available in the the polyoctenamer, that is, in every eighth carbon atom. The preferred form of rubber crumb is the crushed tire rubber produced by the so-called hot crushing process or at room temperature. The grinding and separation of the tire rubber at room temperature produces irregular particles having a high surface area which conveniently increases the number of reactive sites available for binding or degradation with the polyoctenamer. There are many sources of CTLL and the material can be used in vulcanized or devulcanized form. The devulcanized CTLL produced by an oxidation or reduction process can be used. Materials classified as having particle sizes that will pass screens from 20 mesh to 480 mesh are preferred for practicing the invention. However, any CTLL having particle sizes smaller than 10 mesh can be used. Several types or classifications of CTLL are available and have utility in the practice of the invention. For example, conventional passenger car tires are composed by their manufacturers to have certain driving characteristics and comfort on the road. Truck tires and cross-country vehicle tires require different characteristics and therefore are composed differently. Another source of rubber crumb suitable for use in the composition is industrial crushed rubber waste. The inert material used to prepare the asphalt concrete may be one or a mixture of the various standard inert materials used in the art, including gravel, gravel, stone, quarry gravel and recycled paving material. These materials can be produced by grinding at room temperature or cryogenic grinding. The materials can be mixed to achieve desired properties and meet specifications. In order to improve certain performance specifications, additives may be incorporated into the asphalt cementing composition of the invention. It has been found that mineral oil can be added to an asphalt cementer of the invention generally prepared in accordance with the above description to maintain the PG value within an acceptable range. [Please provide an explanation of the SHRP or PG classification data and the X and Y entries in your memorandum of 04/13/98 and provide a general statement on the comparative data for EBE developed by MTI. ] Detailed Description of the Preferred Embodiment Compositions will be described for highway pavements employing the improved asphalt pavement cement of the invention. In the general practice of the method, an asphalt cement that meets the specifications of federal highways is added to a 10,000 gallon heated mix tank in an asphalt terminal or to an asphalt recirculation tank in the asphalt concrete plant. Asphalt cement is maintained at a temperature in the range of 280 ° to 350 ° F, with the average temperature being at the upper end of the range; that is, 320 ° F to 340 ° F. The asphalt cement is circulated by means of a recirculation pump and / or complementary mixing mechanism. In order to facilitate the mixing of the additional ingredients, the heated terminal tank may also be provided with auxiliary agitation in the form of an offset double mounted propeller or the like. To add additional ingredients in the asphalt concrete plant, the other ingredients (CTLL, polyoctenamer) are added to the Pug mill with the inert material and the asphalt cement which can contain a CTLL mixture. Typical compositions using representative shapes of crushed rubber and rubber particles are illustrated below. As will be apparent to one skilled in the art, the specific proportions and ingredients may be varied to meet local specifications, weather conditions and other specific conditions. Example 1 An asphalt pavement cement is prepared by heating 91.5 parts of asphalt cement from 58-28 at a temperature in the range of 280 ° to 320 ° F and adding, with continuous mixing, 8 parts of tire rubber for automotive tires (CTLL) of 80 mesh. The mixture is continuous and 0.5 parts of 80% trans-polyoctenamer (VESTENAMER® 8012) are added mixing for approximately 30 minutes until it dissolves in the asphalt. Next, 6 parts of this asphalt cement is added to 94 parts of a standard stone inert material in a batch production mixer with conventional or vertical drum to produce the asphalt concrete. The asphalt concrete is then applied to a suitably prepared underground surface using standard paving techniques to provide a road surface having improved resistance to railing and shoveling and the formation of thin sheets of ice. Example 2 An asphalt pavement cement is prepared by heating 80 parts of 58-28 asphalt cement at a temperature in the range of 280 ° to 350 ° F and 18 parts of crushed tire rubber for 40 mesh trucks. The mixture is continuous for about 3 hours until a uniform mixture is obtained. The mixture is continuous and 2 parts of 60% trans-polyoctenamer (VESTENAMER® 6213) are added mixing for approximately 30 minutes until it dissolves in the asphalt. The combined asphalt cement is transferred from the mixer to an insulated truck for transport to the paving site which is in a remote location in the asphalt mixing plant. Then, 8 parts of this asphalt cement mixer are mixed with 92 parts of a standard inert material in the hopper of a paving spreader to produce asphalt concrete which is applied to a properly prepared road surface. Example 3 An asphalt pavement cement is prepared by heating 99 parts of 50-30 asphalt cement at a temperature in the range of 280 ° to 350 ° F and 0.9 parts of cryogenically shredded industrial rubber waste. The mixture is continuous for about 1 hour until a uniform mixture is obtained. Then, 0.1 part of 80% trans-polyoctenamer (VESTENAMER® 8012) is mixed with continuous mixing for about 15 minutes until it dissolves in the asphalt to form the cementizer. Then, 7 parts of this asphalt cement is mixed with a mixture of inert material consisting of 90 parts of quarry gravel and 3 parts of recycled glass in a universal mixer to produce asphalt concrete which is then applied in a thickness of about two inches to renew a properly prepared road surface. Example 4 An asphalt pavement cement is prepared by heating 80 parts of 64-18 asphalt cement at a temperature in the range of 280 ° to 350 ° F and adding 10 parts crushed cross-country tires at room temperature with continuous mixing. . After mixing for approximately 1.5 hours to obtain a uniform mixture, add 10 parts of 80% trans-polyoctenamer (VESTENAMER® 8012) and mix for an additional period of about 1.5 hours until it dissolves in the asphalt to form the cementizer. Then, 10 parts of this asphalt cement is added to a mixture of 80 parts of gravel and 10 parts of crushed 10-mesh rubber tires in a vertical mixer to produce asphalt cement. The resulting asphalt cement is transferred to a transport truck to the paving site where it is dispersed on a classified underground surface and tamped to provide a parking lot and access roads. Example 5 A composition for paving highways is prepared using the following mixture of inert material: Ingredient Screen * (inch) Quantity (pounds) Sand 1/4 2450 Gravel # 2 3/8 620 Gravel # 3 3/16 950 Gravel # 4 1/16 630 * The material will pass through a screen with openings of indicated size The inert material, amounting to 4650 pounds, is transported from storage bins to the weather through a flexible conveyor belt system in a heated drum mixer with a horizontal screw that is maintained at a temperature of about 300 ° F to 400 ° F to chase away any moisture. The dried inert material is discharged at a temperature of about 340 ° -350 ° F. The heated inert material is discharged to a Pug mill having a pair of counter-rotating blades that is heated with oil and maintained at approximately 300 ° F. Then, forty pounds of CTLL 10 # and three (3) pounds of Vestenamer® 8012 trans-polyethanomer are added to the Pug mill and mixed for approximately 5-10 seconds at 90 rpm.

Next, about 350 pounds of a mixture of 7% CTLL in asphalt cement at 340 ° F is added to the Pug mixer. After mixing for approximately 30-35 seconds, the asphalt concrete is transferred to a transport truck to the paving site where it is immediately transferred to the hopper of a paving spreader. The composition for paving is advanced from the hopper and is also mixed by a 12-inch helical screw conveyor that moves it forward to the spreader section. A pair of 6-inch counter-rotating helical screw conveyors evenly distribute the asphalt concrete along the front section of the spreader where it is deposited on the prepared road substrate. The temperature of the paving composition, when deposited, is around 270 ° F and approximately one hour has elapsed since the initial mixture of the polyoctenamer with the CTLL / asphalt cement. After depositing the paving composition of the invention, the roll compression for paving was started and continued for approximately thirty minutes to finish the paving in a road section using this batch of asphalt concrete. The road surface temperature compacted during this operation was greater than 150 ° F. During the tamping operation, it was noted that the surface of the composition of the invention had considerably improved the "absorption" in the tamper equipment as compared to the CTLL asphalt concrete without the polyoctenamer. The hot asphalt concrete could be taped much earlier than the prior art composition, which should be allowed to cool in order to reduce the absorption of material from the paving surface. It was also noted that the paving composition was easily discharged from the truck to the paving machine and that the material did not stick to the surfaces of the spreader or protrusions of the various screw conveyors with which it had contact. Based on the evaluation of economic data, an asphalt cementing composition in accordance with the invention can provide excellent performance characteristics with a substantial cost savings, compared to an EBE modified cementizer. These advantages include the more uniform mix of the ingredients, the reduction in viscosity of the rubber asphalt which reduces the absorption of the road surface (the asphalt sticking to the heated roller cylinders), the faster paving (the rollers can touch the hot surface faster) which also provides a better finish composition for the roads. Therefore, the invention can provide the advantages of an excellent road surface for less money, thereby allowing an increase in the paved miles within the authorized budget, or a saving in the cost of the project.

Claims (7)

1. Claims 1. An asphalt cement for pavements comprising: (a) from 80% to 99% by weight of asphalt cement; (b) from 0.5% to 20% by weight of rubber crumb and (c) from 0.01% to 10% by weight of polyoctenamer.
2. 2. The pavement asphalt cementizer of claim 1 comprising: (a) from 80% to 95% by weight of asphalt cement; (b) from 2% to 15% by weight of rubber crumb and (c) from 0.2% to 5% by weight of polyoctenamer.
3. 3. The pavement asphalt cementizer of claim 1 wherein the polyoctenamer is a trans-polyoctenamer rubber.
4. 4. The asphalt paving cement of claim 3 wherein the trans-polyoctenamer rubber has a melting point of about 54 ° C.
5. 5. The pavement asphalt cementizer of claim 3 wherein the trans-polyoctenamer has approximately 80% of its bonds in the trans position.
6. 6. The pavement asphalt cementizer of claim 3 wherein the trans-polyoctenamer has a melting point of about 30 ° C.
7. 7. The pavement asphalt cementizer of claim 3 wherein the trans-polyoctenamer has approximately 60% of its double bonds in the trans position. 10. A process for the manufacture of an asphalt cementing composition for pavements comprising: a) heating the asphalt cement at a temperature in the range of 280 ° F to 350 ° F; b) the addition to the heated asphalt cement of 0.5 percent by weight to 20 percent by weight, based on the total weight of the composition of the cement, rubber crumb and 0.01 to 10 weight percent, based on the total weight of the composition of the polyoctenamer cementizer; and c) the mixture of asphalt cement, rubber lump and polyoctenamer until the polyoctenamer is dissolved to form a homogeneous cementitious composition. The process of claim 10 wherein the temperature of the composition is maintained in the range of 280 ° to 350 ° F during the mixing of step (c). The process of claim 10 wherein the mixing step (c) is continuous from 30 minutes to three hours. The process of claim 10 wherein the polyoctenamer is dissolved in the heated asphalt cement after the rubber crumb is added. 14. The process of claim 10 wherein the polyoctenamer has a melting point of 54 ° C / 130 ° F. 15. The process of claim 10 wherein the rubber crumb is crushed tire rubber. 16. The process of claim 15 wherein the crushed tire rubber is derived from crushed tires at ambient temperatures. 17. The process of claim 15 wherein the crushed tire rubber is of a particle size that will pass a 40 mesh screen. 18. The process of claim 10 which includes the additional step of adding mineral oil to the composition of the cementizer. The process of claim 10 wherein the cementitious composition is mixed by passing the composition through a recirculation pump. 20. A process for the manufacture of an asphalt concrete composition for paving comprising an asphalt cement and inert material, the process comprising the steps of: a) heating the asphalt cement to a temperature in the range of 280 ° F at 350 ° F; b) the addition to the heated asphalt cement of 0.5 weight percent to 20 weight percent, based on the total weight of the cementitious composition, of rubber crumb and 0.01 to 10 weight percent, on the base of the total weight of the composition of the polyoctenamer cementer; c) the mixture of asphalt cement, rubber crumb and polyoctenamer until the polyoctenamer dissolves to form a homogeneous cementitious composition; d) the combination of the composition of heated cement and inert material; e) the mixture of the cementitious composition and the inert material to uniformly coat the material inert with the hot cementitious composition to form a homogeneous asphalt concrete composition for pavements. 21. The process of claim 20 wherein the mixture of step (e) is part of the substantially continuous process. 22. The process of claim 21 wherein the mixture of step (e) occurs in the hopper of a spreading machine for paving. 23. The process of claim 22 wherein the inert material comprises recycled paving material. 24. The process of claim 20 wherein the mixture of step (e) occurs in a vertical batch production mixer. 25. The process of claim 20 wherein steps (a) - (c) are performed at a location remote from the place where steps (d) and (e) are performed and the process comprises the additional step of transporting the Asphalt cement in an isolated tank to the remote place. 26. A paving composition comprising an asphalt cement and inert material, where the asphalt cement is composed of asphalt cement, polyoctenamer and rubber crumb. 27. The paving composition of claim 26 wherein the polyoctenamer is a trans-polyoctenamer having about 80% of its double bonds in the trans position and a melting point of about 129 ° F / 54 ° C. 28. The paving composition of claim 26 further comprising classified particles of crushed rubber that will pass a 10 mesh screen and be retained in a 20 mesh screen. 29. A paved surface comprising an asphalt cement and inert material, where the asphalt cement is composed of asphalt cement, polyoctenamer and rubber crumb. 30. The paved surface of claim 29 wherein the polyoctenamer is a trans-polyoctenamer having about 80% of its double bonds in the trans position and a melting point of about 129 ° F / 54 ° C. 31. Method for increasing the compatibility of the rubber grouts and asphalt cement in an asphalt cement composition comprising the addition to the composition of 0.01 to ten weight percent of polyoctenamer, based on the total weight of the composition of asphalt cement. 32. The method of claim 30 wherein the rubber lump is crushed tire rubber. 33. The method of claim 32 wherein the rubber lump is composed of particles that will pass a 40 mesh screen. 34. The method of claim 31 wherein the rubber crumb comprises from 0.5 to 20 weight percent, based on the weight of the asphalt cement composition. 35. The method of claim 31 wherein the polyoctenamer is an isomeric mixture that is about 80% trans-polyoctenamer and about 20% cis-polyoctenamer. 36. The method of claim 31 wherein the polyoctenamer is mixed in the melted asphalt cement prior to the addition of the rubber lump. 37. The method of claim 31 wherein the composition of the asphalt cement is prepared by mixing asphalt cement, trans-polyoctenamer and crushed tire rubber at a temperature in the range of 280 ° F to 350 ° F for a predetermined time varying from 30 minutes to two hours. 38. The method of claim 37 wherein the time is sufficient to allow substantial degradation between the asphalt cement, the rubber of crushed tires and the polyoctenamer.