How to apply asphalt emulsion

Emulsified bitumen is the melted asphalt particles dispersed in aqueous media containing emulsifiers, the formation of a mutually insoluble stable emulsion. Has good fluidity and stability, for the maintenance of highway pavement engineering and has a good application function.

In this paper, the technical application of Emulsified bitumen in highway pavement maintenance is described and analyzed.

1.Emulsified bitumenand its functional properties analysis

Emulsified bitumen is a mixture of asphalt and water, Emulsified bitumen is usually high-temperature use of road asphalt, after mechanical mixing and chemical stabilization methods for full emulsification, so that it spreads to the water and liquefied into a low viscosity at room temperature, mobility of a good road construction materials.

Normally, the surface tension difference between asphalt and water is large, and will not be miscible with each other. If the formation of asphalt particles through high-speed centrifugation, shearing, and other mechanical effects, are dispersed into the water medium containing emulsifiers stabilizers, and other surfactants, the emulsifier can be directed to adsorb on the surface of asphalt particles, thus reducing the interfacial tension between water and asphalt, so that the asphalt particles can be in the water to form a stable dispersed system, which is the principle of Emulsified bitumen emulsification.

The main characteristics of Emulsified bitumen for its storage stability, viscosity characteristics, and maintenance speed. At room temperature Emulsified bitumen can be mixed with cold damp stone application. When the Emulsified bitumen emulsion solidification, its material strength performance highlights, can be used for stone chip sealing, cold mix, thin slurry sealing, and other technical processing, for road upgrading and maintenance, and can also be used for new road construction. Relatively speaking, the application of Emulsified bitumen has the following characteristics:

1.1 Wide range of uses

As Emulsified bitumen has good mobility and stability, solidification has obvious strength properties, so it has a wide range of applications, in road construction and maintenance of road construction using Emulsified bitumen road construction and maintenance management, maintenance management, exchange and cooperation plus micro-letter 627361748 can be less subject to the impact of wet and cold temperatures, found that the road surface damage can be timely maintenance repair, which can improve the road conditions promptly, to improve the safety and stability of road transportation. Improve the safety and stability of pavement transportation.

1.2 Energy saving and environmental protection

Relative to diluted asphalt, Emulsified bitumen in the kerosene gasoline content is quite small, to a certain extent, greatly saving fuel resources and process energy consumption. At the same time, the production process of Emulsified bitumen is carried out in a sealed state, with low heating temperature, heating time is short, the degree of pollution is light, the Emulsified bitumen process avoids high-temperature heating operations, and the emission of hazardous substances, and effectively provide a safer, energy-saving and environmentally friendly technology system.

1.3 Convenience of use

Spreading of Emulsified bitumen can be directly mixed with aggregate at room temperature, or directly sprinkler spraying, construction convenience, can effectively improve labor conditions. The use of the pothole repair method of filling potholes and other small areas of pavement can be directly hand-operated, a small amount of cold mix mixing equipment is simple and easy. Since it can be stored in tanks for a long period, it is extremely convenient to use rollers to spread it when it is applied in remote areas.

2.Common road pavement diseases

Affected by various factors such as pavement design, material aging, and environmental impacts, bridge highways in the process of load bearing operation, the road surface will often appear a lot of damage phenomenon. Bridge highway pavement common diseases mainly include the following aspects:

2.1 Damage collapse

Modern highway and bridge construction, due to long-term natural weathering and the limitations of the construction technology itself, in the process of load bearing, maintenance management submission exchange cooperation plus micro letter 627361748 related to the bridge pavement asphalt concrete pavement will appear cracking and cracking, settlement dislocation and damage collapse phenomenon, affecting the traffic performance of the highway and bridge.

2.2 Deformation and distortion

Highway bridge pavement due to natural rain erosion, pavement drainage function is not smooth, seepage phenomenon is serious, coupled with severe overloading of vehicles caused by the plastic deformation of the pavement curved bending, resulting in pavement pushing, rutting, squeezing pulp and rubbing plate and other disease phenomena occur.

2.3 Crack spalling

The loss of rigidity of the pavement, the overloaded weight of repeated crushing, the weakening of the material properties, and the environmental temperature drop will often lead to the formation of cracks in the pavement, especially in the vehicle and pore water pressure, causing the loss of adhesion of asphalt, resulting in the pavement concrete peeling collapse.

2.4 Pothole section

Road surface layer long-term load weathering or temperature rise and contraction impact, road surface asphalt concrete and other structural materials will gradually occur aging, resulting in the loss of fines in the road surface mixture or road surface granularity is small, resulting in the formation of the road section, pothole damage, resulting in a serious loss of road surface structure performance.

3.Emulsified bitumenin the application of highway maintenance

3.1 Thin slurry sealer

The thin slurry sealing layer is a kind of hard wear-resistant aggregate and asphalt mix gradation composed of cold mix construction technology. The Emulsified bitumen mix has good adhesion and can be constructed on-site on wet pavements. Typically, the gradation of similar thin slurry sealer has high stability, high modulus, and high deformation resistance, maintenance management submission exchange cooperation plus micro letter 627361748 is often used to fill the pavement rutting cracks disease so that the pavement has a high abrasion resistance and excellent resistance to deformation, which greatly increases the strength of the pavement performance and integrity. The application of Emulsified bitumen for thin slurry sealing can greatly extend the life of the highway.

3.2 Stone chip overlay

Stone chip overlay is a commonly used asphalt high-content road surface treatment and maintenance technology, it is spread on the road surface binder layer and then evenly spread the same particle size aggregate layer, with flexible and wear-resistant characteristics, mixed with polymers can effectively increase the bonding force, wear resistance and crack resistance of the road surface.

Modified to be able to carry out road sealing and bridge crack repair, can effectively reduce the road surface reflective cracks. Due to the Emulsified bitumen having excellent chemical adhesion and moisture and other road repair and maintenance properties, stone chip overlay treatment after the composite sealer road surface can withstand considerable traffic loads.

3.3 Cape sealing layer

Cape seal is a pavement treatment technology that uses Emulsified bitumen to lay a flexible stone chip cover under an abrasion-resistant thin slurry seal. This sealer provides the technology to mitigate combined pavement cracking with a smooth surface and is mainly used in road construction and related maintenance and reconstruction of freight roads.

Cape sealing layer fusion of stone chip cover layer in the higher skid resistance and bearing performance and thin slurry sealing layer has the advantages of flatness than the use of thin slurry sealing layer or stone chip cover layer technology alone wear resistance to be higher, highway pavement maintenance in the application of Emulsified bitumen for Cape sealing layer can fully extend the service life of the road.

3.4 Jet repair pothole

Highway pavement maintenance, and spray repair potholes are for pavement depression potholes and rupture damage using Emulsified bitumen filling repair technology. The use of compressed air will be pavement pothole blowing clean, in the pothole surface coating of Emulsified bitumen and filling the aggregate for adequate mixing, and finally, in the pothole above the dry aggregate surface sealing layer, complete the repair.

Spray pothole repair technology does not require compaction procedures, repair pothole waterproof performance and strength performance is higher. Using fast-setting Emulsified bitumen and modified polymer emulsion, the strength of the repaired pothole is more suitable for rapid repair of potholes in winter conditions.

3.5 Micro-surface treatment

The highest form of Emulsified bitumen thin slurry overlay is the micro-surface, The micro-surface is suitable for preventive maintenance of important traffic highways, mainly composed of polymer-modified Emulsified bitumen, mineral filler, 100% rolled crushed stone, water, and the necessary additives, the use of construction equipment while mixing and paving. Micro-surface can stop water infiltration, prevent the aging and loosening of the pavement, improve the skid resistance of the pavement, and effectively extend the service life of the pavement.

In highway maintenance, micro-surfacing is used to fill the already stabilized rutting lesions in more applications. After the paving of the micro-surface mix, it can be opened to traffic in a short time, and the specific time is determined by the actual situation of each project. In addition, the micro-surface on the aggregate composition has very high requirements, the stone must be wear-resistant, strong, but also clean, maintenance and management of the exchange of manuscripts and cooperation plus micro letter 627361748 molding thickness is generally 5mm or 10mm or so. The Emulsified bitumen used in the micro-surface is modified by polymers, usually with SBR latex, but also SBS modified, the residue has a high softening point. Service life is generally 5 to 6 years, the longest can reach 8 years.

3.6 Transparent layer and adhesive layer

In the construction of asphalt driveway, permeable and adhesive layer is an indispensable process, in the repair of highway pavement, due to the uniformity of ordinary asphalt and permeability being poor, often after construction, water seepage and adhesion do not meet the ideal requirements, thus affecting the quality of the pavement after repair. Emulsified bitumen in this area has a very good performance, applied to maintenance and repair works pavement paving has a good application effect.

In short, the development of modern transportation has promoted the diversification process of bridge and highway construction. Affected by natural climate change and objective technical conditions, highway and bridge pavement in the process of bearing operation, often with different degrees of disease, to the stable operation of the traffic caused great safety hazards. Using the scientific performance of Emulsified bitumen, timely maintenance of highway pavement is an important technical guarantee for the sustainable development of modern transportation.