Natural Bitumen(Natural Asphalt)(Natural Bitumen)
Black or brown petroleum-like material that contains a consistency varying from the viscous liquid to the glassy solid. it's obtained either as a residue from the distillation of petroleum or from natural deposits. natural asphalt consists of compounds of hydrogen and carbon with minor proportions of nitrogen, sulfur, and oxygen. natural asphalt (also known as Brea), that is believed to be formed during an early stage within the breakdown of organic marine deposits into petroleum, characteristically contains minerals, whereas residual petroleum asphalt doesn't.
The use of natural asphalt is very old, dating back to its use as a water stop between brick walls of a reservoir at Mohenjo-Daro (about the third-millennium bc) in Pakistan. within the middle east, it was extensively used for paving roads and sealing waterworks, necessary applications even today. The Pitch Lake on the island of Trinidad was the primary large commercial supply, however, natural supplies have since declined in importance as petroleum became the major source. Gilsonite, wurtzite, and similar vein asphalts have special uses in heat-resistant enamels; they are hard and are mined like coal. oil asphalt is made altogether consistencies from light-weight road oils to heavy, high-viscosity industrial types.
Natural asphalt softens once heated and is elastic under certain conditions. The mechanical properties of natural asphalt are of very little significance except once it's used as a binder or adhesive. The principal application of asphalt is in road surfacing, which can be done in a variety of the way. light oil “dust layer” treatments are also engineered up by repetition to create a hard surface, or a granular aggregate is also added to an asphalt coat, or earth materials from the road surface itself are also mixed with the natural asphalt.
Natural asphalt uses:
Although natural asphalt is mainly used for paving roads, it also can be used for various different purposes. the versatility of natural asphalt makes it such a wide used material. Among others, it may be found within the following sectors:
- Transportation (e.g. roads, railway beds or airport runways, taxiways, etc.),
- Recreation (playgrounds, bicycle paths, running tracks, tennis courts...)
- Agriculture (barn floors, greenhouse floors...)
- Industrial (ports, landfill caps, work sites...)
- Building construction (floorings...)
Types of Natural Asphalt Pavement
In addition to being smooth, durable, safe, and quiet, natural asphalt is that the most versatile pavement material. Pavement structures are designed to handle any load, from passenger cars to heavy trucks. Surface mixes are customized to absorb noise, to reduce splash and spray during rainstorms, and even to assist treat rain water.
Busy commercial airports like Baltimore-Washington International, Oakland International, san Francisco International, McCarran (Las Vegas), Pearson International (Toronto), and Logan International (Boston) have main runways surfaced with HMA. natural asphalt is additionally used extensively on runways at general aviation airports. Asphalt's speed of construction makes it an ideal alternative for rehabilitation of busy aviation facilities.
At racetracks, asphalt pavements give swish driving surfaces combined with the excellent traction demanded by professional stock car racing. Of the 33 NASCAR race tracks across the country, 31 have natural asphalt surfaces. Of the 88 race tracks listed for the NASCAR Short Track series, 66 are natural asphalt, 21 are dirt or clay, and 1 is concrete.
Whether on the road, during a parking lot, or at an airport, natural asphalt pavements add up to the best value for the taxpayer dollar, with the lowest life cycle price and also the highest residual value.
Why does my natural asphalt want “maintenance”?
three – five years when asphalt has been installed, deterioration has begun. Here is why.
– Over time sunlight (oxidation) breaks down the liquid asphalt that holds the aggregate together, causing raveling and shrinking cracks. creating the natural asphalt mat extremely brittle, the roughening surface ever loosing the dark black appearance, turning additional light gray.
– Open surface cracks and huge open cracks that develop permit water to penetrate through the asphalt mat and affect the supporting materials below. causing erosion and base material failure. Since water isn't compressible, as a car drives over an area that has cracks and has allowed water to saturate the base material. the mixture acts as a hydraulic system slamming the water into the supporting materials and causing even greater failure.
Why Use natural asphalt rather than Concrete?
Though concrete once was used for paving roads, parking lots, and alternative projects, asphalt paving is that the preferred selection these days. to start to know why natural asphalt paving is superior to concrete paving (also referred to as cement paving), one ought to knowledge natural asphalt and concrete are created.
Concrete is created using aggregate (like crushed rock and sand), along with cement and water. The cement acts because of the binder in concrete, holding the aggregate along. because the mixture dries, it forms a stiff, unforgiving solid that's prone to cracking and breaking, especially if the surface beneath it's not perfectly smooth.
Like concrete, natural asphalt is created using aggregate. Its binder, however, is bitumen, a dark, sticky substance derived from crude. When roads, parking lots or driveways are built using natural asphalt construction, hot asphalt (bitumen mixed with fine aggregate) is poured onto a bed of heavier aggregate so pressed into it with a steamroller. Once the natural asphalt cools to the surrounding air temperature, it's strong enough to withstand automobile traffic. whereas natural asphalt is very hard and durable, it offers enough flexibility to accommodate imperfections in underlying surfaces, a feature that concrete sorely lacks.
The other benefits of natural asphalt paving over concrete or cement paving are plentiful. one in every of those benefits is that removal and replacement of damaged asphalt may be a simple and relatively easy method compared to concrete. natural asphalt is additionally a 100% recyclable product. due to the heavy demand of asphalt for recycling purposes, you may rarely find this material taking up valuable and limited landfill space. natural asphalt construction projects are finished and opened for traffic a lot of quicker and with plenty, less expense than concrete construction comes. Maintenance and repair of asphalt pavement are quicker and fewer costly than that of cement pavement, as well.
Repairing minor cracks in natural asphalt driveways and walkways is so easy that owners will tackle this maintenance project themselves. natural asphalt crack repair is done by one person in one afternoon, and this simple, cheap task will increase the longevity of an asphalt surface significantly.
When over simply simple asphalt crack repair is needed, however, the solution still requires less time and money if one chooses asphalt paving over cement paving. unlike concrete, that has to be removed and replaced once significant cracks appear, natural asphalt is resurfaced in a lot of less time, and at a fraction of the cost.
natural asphalt resurfacing simply involves applying new asphalt over the old. damaged areas are filled with fresh asphalt, and a steamroller goes over the entire surface to yield smooth, even pavement.
Complete natural asphalt resurfacing is quick and extremely cost effective. Even better, asphalt resurfacing, whereas returning the asphalt to its original smoothness, also adds structural integrity so it will still provide a durable, pleasant driving surface below higher traffic volumes and increased vehicle weights.
From new construction to all or any forms of repairs, natural asphalt paving beats concrete or cement paving when. count on natural asphalt for attractive, long-lasting performance and a substantial savings of each time and money.
Other important applications embrace canal and reservoir linings, dam facings, and other harbour and sea works; natural asphalt thus used is also a thin, sprayed membrane, covered with earth for protection against weathering and mechanical damage, or thicker surfaces, often as well as riprap (crushed rock). Natural asphalt is also used for roofs, coatings, floor tilings, soundproofing, waterproofing, and other building construction parts and in a range of industrial products, like batteries. for certain applications an asphaltic emulsion is prepared, within which fine globules of natural asphalt are suspended in water.
Asphalt crack sealer by Gilsonite
Crack sealer produced by blend of bitumen with SBS, Gilsonite, rubber process oil, crumb rubber in special temperature and pressure and using as sealing cracks and joints for the asphalt pavement and parking also cement pavement. It is use to seal expansion and longitudinal and transverse crack and construction joints between concrete and asphaltic shoulder. Gilsonite is one of the most environmental friendly products to repair and seal the asphalt. Gilsonite joint sealer and crack sealer is widely used in the world. The preferred embodiment of the invention employs a roofing adhesive or cement for filling the parking lot crack, either asphalt or concrete after it has been thoroughly cleaned either with air or water. The adhesive is preferably a modified bitumen rubber asphalt normally used for bonding roofing materials.
The adhesive is mixed with a SBS, crumb rubber, gilsonite and asphalt oil as asphalt roof coating which makes the mixture form a water impermeable shield. The pliability and time to set depends on the temperature and can be adjusted by adding mineral spirits or airing the adhesive. The crack is filled with the adhesive mixture which is then exposed to air for 15 to 20 minutes. A formed cured cap is then placed on top of the crack and the adhesive mixture. Other cap materials are available such as asphalt oil. The cured cap provides a durable surface that will withstand vehicular traffic while protecting the curing adhesive. Although the adhesive mixture sets in 15-20 minutes, it takes days to fully cure. The adhesive eventually fully cures forming a water-impermeable shield in the crack that can withstand vehicular traffic even though the cap may gradually deteriorate from traffic. The preferred method creates a water-tight shield that lasts substantially longer than current methods conventional pavement patching materials. It is well known that paved surfaces, such as roadways, sidewalks, driveways, tennis courts and the like, can develop cracks, which necessitate repair. These cracks often develop over time, but can also appear in new paved surfaces. Asphalt surfaces in particular are susceptible to developing cracks in regions that have extreme weather conditions or that have large temperature fluctuations. It is desirable to repair these cracks to preserve the longevity of the entire asphalt surface as well as to prevent damage or injury to those using the surface. One way to eliminate cracks from paved surfaces is to tear it up and replace the entire surface. This process is extremely expensive. It is also not practical to replace the entire surface, which has many more years of useful life, because cracks have formed in a small portion of the surface.
Road pavement seal by Gilsonite
Instead of ripping up an entire paved surface, various less expensive methods have been employed to repair cracks that may develop in these surfaces. One known process is to fill the cracks with an asphalt sealer. While this often serves to fill the cracks at least temporarily, the utilization of current asphalt sealers to repair cracks suffers from some significant disadvantages. Initially, Gilsonite asphalt sealers are susceptible to melting when subjected to high temperatures, which results in the sealer flowing away from a crack filling position. For example, when the asphalt sealer heats up, it becomes softer and can be squeezed, such as by a vehicle passing there over, so that it no longer properly fills the crack. Additionally, because of their composition, current sealers can be slippery, which is undesirable. As existing asphalt sealers have very limited durability when serving to fill cracks, if the sealer no longer serves to fill the crack, additional crack repair services are required. Accordingly, existing crack repair methods and systems are costly, both in terms of material and labor. In some instances where the crack is deep enough, a grout material, such as a mortar or cement, is used to assist in filling these cracks. In these instances, the grout material is placed in the crack and allowed to harden. Thereafter, the asphalt sealer is placed in the crack over top of the grout material to completely fill the crack and level out the paved surface. This can also create durability issues in that existing grout fillers that are used in crack repair applications often have significant shrinkage issues.
Thus, while an asphalt sealer used to help fill a crack may initially be level with the surface being repaired, when the grout material shrinks, the asphalt sealer will drop into the crack as the level of the grout material recedes. The asphalt sealer thus is no longer flush with the upper paved surface and often falls into the crack itself. In an effort to address some of these deficiencies, aggregates such as sand or limestone, were added to the asphalt sealer to provide it with more substance. However, these efforts were unsuccessful as these aggregates would release from the sealer, such as when contacted, and they would therefore eventually fail. Thus, while they provided some increased durability, they ultimately suffer from the same disadvantages as asphalt sealers without an aggregate. It would therefore be advantageous to provide an improved asphalt sealer for paved surfaces that overcomes these disadvantages. It would also be advantageous to provide an improved crack repair system that overcomes the failings with current systems.