Abstract: Pavement aging can be reduced by applying to an asphalt-containing pavement a topcoat layer or a surface treatment containing asphalt binder with sterols.

Abstract: Asphalt compositions comprising reclaimed asphalt and a rejuvenating agent are disclosed. The reclaimed asphalt comprises aggregate and an aged binder. The rejuvenating agent, which has a cyclic content of at least 5 wt. %, comprises an ester or ester blend derived from an acid selected from aromatic acids, fatty acids, fatty acid monomers, fatty acid dimers, fatty acid trimers, rosin acids, rosin acid dimers, and mixtures thereof. The rejuvenating agent revitalizes the aged bitumen binder of reclaimed asphalt and restores its physical properties to those of the original performance-grade bitumen. Improvements include desirable softening, low-temperature cracking resistance, better fatigue cracking resistance, good elevated temperature performance, improved miscibility, and restored temperature sensitivity.

Abstract: The present invention generally relates to an additive package for warm-mix asphalt formulations for the pavement of road surfaces, said additive package comprising a) surfactant component, and b) an asphalt rheology modifying component, wherein said asphalt rheology modifying component comprises at least one of a i) a wax component and ii) a resin component. The invention also relates to a warm mix asphalt having improved compaction at lower temperatures, and to a pavement made from said warm mix asphalt.

Abstract: The present invention relates to a bitumen or asphalt formulation for the pavement of road surfaces, said formulation comprising a mixture of bitumen and aggregates, and an additive package evenly distributed therein, said additive package comprising from about i) 10 to 60% by weight of an amine or modified amine surfactant, ii) from about 20 to 90% of an asphalt rheology modifying component.

Abstract: The present invention generally relates to an additive package for warm-mix asphalt formulations for the pavement of road surfaces, said additive package comprising a) surfactant component, and b) an asphalt rheology modifying component, wherein said asphalt rheology modifying component comprises at least one of a i) a wax component and ii) a resin component. The invention also relates to a warm mix asphalt having improved compaction at lower temperatures, and to a pavement made from said warm mix asphalt.

Abstract: The present disclosure relates to a bituminous binder including bitumen and at least two additives making it possible to reduce the manufacturing, processing and compacting temperatures of mixes and asphalts, the first additive being a Tall Oil derivative, alone or in a mixture, and the second additive being a monoester of a mixture of fatty acids. The disclosure also relates to low-temperature methods for the preparation of the mixes and asphalts obtained from the binder containing additives. The disclosure finally relates to the use of the binder containing additives in order to produce mixes and asphalts at lower temperatures, and the use of these mixes or asphalts, in particular in road applications, for sub-base courses, base courses, foundation courses, surface courses such as binder courses and/or wearing courses.

Abstract: A bituminous composition including, based on total weight of the bituminous composition, (a) hard bitumen in an amount of 0.5% to 7.5% by weight, the hard bitumen being characterized by a penetration number of 100 dmm or less at 25° C. as determined according to the American Association of State Highway and Transportation Officials (AASHTO) Method T49; (b) emulsifier in an amount of 0.0005% to 0.2% by weight, wherein the emulsifier has a Hildebrand solubility parameter of at least 19 (MPa)1/2; (c) water; and (d) aggregate in an amount of 90% to 99% by weight, the aggregate having an aggregate surface that is wetted with the hard bitumen, wherein the bituminous composition is at a temperature ranging from 50° C. to 140° C.

Abstract: This invention relates to bituminous compositions and methods of producing the same. More particularly, the invention relates to the production of bituminous compositions formulated with performance-graded bitumen-containing solvent-free bitumen emulsions which exhibit controllable, temperature-dependent interfacial rheology. When employed in paving applications, these bituminous compositions develop adhesive strength and load-bearing strength properties at rates comparable to traditional hot mix paving compositions and at rates faster than traditional cold mix paving compositions.

Abstract: A rosin oil-modified bitumen compound having a significantly reduced viscosity compared to the conventional bitumen at same temperature, yet providing the bituminous composition of comparable indirect tensile strength and performance is disclosed. The bituminous composition made of the disclosed modified bitumen allows the production and application at lower temperatures than the conventional bituminous composition, and thereby a reduction in energy consumption and a lower emission level of organic volatiles and fumes.

Abstract: The present invention relates to bituminous compositions suitable for use in paving applications containing water-in-oil bitumen dispersion of paving grade bitumen such as penetration-graded, viscosity-graded and/or penetration-graded varieties that is substantially free of volatile solvents and made by controlling temperature-dependent interfacial rheology through the use of selected surfactants. The invention paving compositions are suitable for use in the construction of load-bearing, high-traffic pavements at a temperature range lower than that required for conventional hot-mix bituminous paving compositions, yet with similar or superior compaction to densities property and at least equal cure rate.

Abstract: The invention relates to an improved surfactant mixture which permits use of lower concentrations of polyphenolics including natural vegetable polyphenolic extracts and/or synthetic phenolic resins to produce stable anionic slow-setting asphalt-in-water emulsion compositions suitable for use as pavement sealers and coatings. The polyphenolics are selected from natural vegetable polyphenolic extracts including Chestnut A, Chestnut N and Sumac-K10; or from synthetic phenolic resins including phenol-formaldehyde, resorcinol-formaldehyde and novolak resins; or mixtures thereof; in amounts of about 0.1% to 10% polyphenolics in the final emulsion, to form and stabilize the emulsion. The emulsions employ a surfactant mixture comprising a nonionic surfactant with a hydrophilic/lipophilic balance index of from about 16 to about 20, and an anionic lignin sulfonate, in amounts of about 0.1% to 3.0% surfactant mixture in the final emulsion. Optionally 0.02% to 2.00% w/w of sodium borate decahydrate may be included.

Abstract: Resinous compositions comprising lignin and polymerized rosin. Use of salts of the resinous compositions as concrete air-entraining agents and asphalt emulsifiers.

Abstract: A pavement rejuvenating composition in which particular coal tar derivatives and other optional ingredients are admixed with one or more blackening agents. The blackening agent may be one or more of the following: soft coal tar pitch, aromatic cracked petroleum residue, silicone, aliphatic amine, carbon black or 0.01-2.0% by weight pavement dressing conditioner to give the desired blackening and pavement preservation effect.

Abstract: A chemical emulsifier useful to produce a cationic asphalt emulsion of different breaking characteristics, to be applied in road construction and maintenance, the emulsifier comprising a compound obtained by the reaction between a natural wood resin, colophony resin and an amine, whereby, as a result of said reaction, water is liberated as a by-product and primary, secondary and tertiary amino groups are incorporated as substituents to the resin molecules.

Abstract: The present invention provides a method of sealing and priming a prepared substrate, such as a base or sub-base for a roadway, comprising the application of an amount of an emulsion consisting essentially of a first phase of a combination of resinous petroleum oil and an asphalt, a second phase of water, and suitable emulsifiers and stabilizers. The first phase comprises from about 0.25% to 21% asphalt and from about 3.33% to 33.95% resinous oil based on the total weight of the emulsion. The second phase of water provides from about 62.5% to 91.5% of the total weight of the emulsion. The emulsifiers and stabilizers are from about less than 0.16% to about 2.5% of the total weight of the emulsion. The contemplated ratios of the first asphalt and resinous oil phase to the second water phase in the total emulsion applied to the base course are from about a 1:1.8 to 1:11 ratio in the total emulsion.

Abstract: A working material for construction or repair comprising (A) a mixture of 0.5 to 30% by weight of (a-1) a hydroxide of a divalent or higher basic metal, 10 to 99% by weight of (a-2) an aggregate and 0.5 to 70% of (a-3) a bituminous substance, the total amount of these materials (a-1), (a-2) and (a-3) being 100% by weight, and covering the mixture (A), (C) oxidized rosin or a mixture of (C) oxidized rosin with (D) a compound containing more than one carboxy group per molecule on an average and/or (B) a liquid hydrocarbon or a vegetable oil.

Abstract: A gelled asphalt cement having improved properties over conventional asphalt cement, including reduced temperature susceptibility and lower rate of age hardening is disclosed. This multigrade asphalt cement is produced by gelling a liquefied asphalt material. This is accomplished by saponifying in the liquefied asphalt, substantially free of water, at least one fatty acid and at least one resin acid with an alkali metal base, or by adding the already saponified product to the liquefied asphalt. The resulting gelled asphalt cement is utilized in conventional processes in road, roofing and specialty applications. The asphalt cement may be prepapred and applied using conventional hot-mix asphalt processes in existing hot-mix equipment, standard roofing application equipment and specialty asphalt application equipment.

Abstract: A method for long-term storage of radioactive waste in a solid bitumen is here taught. A granular ion-exchange resin (including radioactive ions) is mixed with a bitumen and water emulsion to produce a swollen aqueous product for encapsulation. The method is carried out at room temperature and optionally includes a cationic emulsion having a pH value of less than 4. The emulsion has a water content form 15-50% by weight and preferably is saturated with the water.

Abstract: Paving mixtures are disclosed comprised of paving grade asphalt containing about 4 to 10% by weight of a fibrous filler and 2.5 to 15% by weight of a mixture of eighteen carbon fatty acids containing up to about 30% by weight of rosin.

Abstract: A petroleum distillate-free or essentially petroleum distillate-free prime coat material for application to absorptive surfaces, such as untreated road or street surfaces, which is designed to penetrate, bond, and stabilize such existing surfaces and to promote adhesion between such surfaces and construction courses that follow. This type of material is also often used as a dust palliative. For this purpose, the material is applied to an untreated surface to control dust.

Abstract: A method is provided for stabilizing a polymerizable premix composition for use in preparing a polyurethane surface and the resulting composition. Lower alkane polyol esters of rosin acids are employed in achieving the stabilization.

Abstract: A method of preparation of a lubricant for lubricating the external surface of a drilling pipe comprising the steps of preparing a mixture consisting essentially of gear-box oil, petroleum paraffins, bitumen and tall oil pitch; primary heating of said mixture to 100.degree.C and secondary heating up to 300.degree.C.

Abstract: Stable, modified cationic bituminous emulsions are provided which form residuums having improved temperature susceptibility characteristics by combining with the base emulsion a tallate salt of a metallic polyvalent cation selected from the group consisting of tin, magnesium, copper, aluminum and iron.