Release time：2019-01-22 Browse times：0
Definition of 1.1 Leehloric Polymer Color Mask Technology
The color overlay of Leehli Polymer is a polymer anti-skid and wear-resistant layer 3 +0.5mm thick on the original asphalt or concrete pavement to achieve the color of the pavement on the basis of maintaining the structural performance and elevation of the original pavement. When used in asphalt colorization, breathable and waterproof leachate overlay is also one of the preventive measures to prolong the service life of asphalt. The technology of leachate polymer overlay originated from the United States, and is one of the most widely used and used road colorization methods in developed countries such as Europe, America and Japan in recent decades.
Leeway force is a new generation of thin-layer Cold-paved color pavement system based on reactive inorganic materials and polymer. It combines the rigidity and weatherability of inorganic materials, the binding force and flexibility of organic polymer materials, keeps synchronous shrinkage with pavement, and ensures excellent wear resistance by non-cracking, permanent adhesion and adding high abrasive (PSV) color aggregate. This is the case. According to different uses, the surface can be made into smooth and delicate drawing effect, super anti-skid effect of texture spraying or user-defined artistic effect, etc. The color is basically unlimited, water-based environmental protection, non-toxic and tasteless.
Liluli has been widely used in color greenways, municipal roads, bus lanes and highway warning lanes in major cities of China. With its flexible color matching and convenient construction, the application of Liluli in colorful landscape pavement is also brilliant.
1.2 Definition of Hot Mixed Colored Asphalt Pavement
Hot-mixed color asphalt pavement is a thermoplastic asphalt-like material surface layer composed of color asphalt binder, pigments and aggregates, which is 30-40 mm thick on the original asphalt pavement. It is a composite multi-layer paving color pavement system.
The core material of Hot-Mix color asphalt is color asphalt binder, commonly known as color asphalt. There are two ways to obtain: one is to make it light-colored asphaltene material by strong oxidation on the basis of original black asphalt, also known as decolorized asphalt. The decolorization process of decolorized asphalt is also an accelerated aging process. Although the decolorized asphalt still maintains a certain degree of thermoplasticity after decoloration, it is resistant to aging. The properties, long-term crack resistance and color retention of color asphalt are unsatisfactory. Another manufacturing method of color asphalt is chemical synthesis, that is, a thermoplastic binder synthesized by chemical or thermophysical methods, such as C5, aromatic oil, C9, terpene resin, additives, etc. Its color is lighter and it can form various colors by adding pigments. However, compared with petroleum asphalt for road use, the synthesized asphalt has better road performance. There is still a long way to go, and the softening point is low (< 50 C). The problems of ash absorption pollution and aging discoloration after high temperature Re-sticking deserve to be studied.
The mixing temperature of hot-mixed color asphalt is 160-185 C, which belongs to high-temperature mixing. The pigments used must also be high-temperature-resistant pigments. Organic pigments are excluded. Iron red and iron green are the only inorganic pigments that can withstand high temperatures above 160 C. Although iron yellow is also high-temperature resistant in theory, it is rarely used in practice because of the problems of flower faces, so it is optional to make color asphalt pavement. In our daily life, we can hardly find the color asphalt pavement of other colors except dark red and dark green. Even if it is red, it will change color in two ways after several months. One is in the areas where the long-term sunshine and dust pollution are serious. The red color asphalt pavement soon becomes "sheep liver red", which is caused by the fact that the red color asphalt pavement becomes "sheep liver red". The color asphalt binder is heated, softened and adhered to a large amount of dust; while in the non-motor vehicle color asphalt pavement with better environment, the original positive red color will gradually become light to light red, and the surface asphaltene is often exposed after wear, which is due to the poor aging resistance of decolorization or synthetic color asphalt.
Performance comparison
2.1 Comparison of Hot Mixed Colored Asphalt and Road Petroleum Asphalt
Although hot-mix color asphalt is called "asphalt", it is not really asphalt in the true sense. Its chemical composition is very different. The reason why it is called asphalt is that its use method is similar to that of ordinary black asphalt, and at the same time it can realize road color. At present, there is no relevant standard in our country. The test refers to black asphalt. Although each index may reach the standard, it is the most lethal. Aging resistance is not within the scope of detection, which makes many color asphalt binder products have been widely used in the "standard" situation, and after 1-3 years, there are various quality defects such as loose, pit, discoloration, cracks, threshing and so on.
Comparisons between hot-mixed color asphalt and road petroleum asphalt are shown in the table below.
Comparison of 2.2 Leehloric Polymer Colour Cover and Colour Asphalt
Leehloric polymer color cover is a thin layer (2-4mm) of permeable and waterproof seal on the original asphalt or concrete. The road structure performance is determined by the asphalt or concrete structure road. When used on asphalt pavement, it not only provides color for the road surface, but also greatly prolongs the service life of the original road due to the role of the seal.
The color asphalt is a mixture composed of synthetic binder, pigments and aggregates with a certain thickness to replace the road asphalt pavement. The pavement performance is determined by the black road asphalt, the binder layer and the color asphalt. According to CJJ218-2014, the thickness of asphalt pavement structure is related to the nominal maximum particle size of asphalt mixture. The thickness of asphalt pavement is 2-3 times that of nominal maximum particle size. In recent years, most of them are three times that of the nominal maximum particle size. In general, the thickness of AC-13 pavement is 4 cm.
The color asphalt in the surface layer largely determines the applicability of the color road. For example, the analysis of the above table shows that many performance indexes of the color asphalt binder still lag behind that of the road petroleum asphalt. The application practice of the hot mix color asphalt in the past ten years also shows that the system still has great technical defects, and needs the continuous efforts of the professionals to meet the increasing demand. Long road color market demand.
Because of its thin layer, the technology of leachability polymer color mask has no need to worry about its road performance. As a kind of covering material, it should also solve four problems: adhesion, wear resistance, color retention and skid resistance.
Adhesive leachability is a composite product of polymer modified by reactive inorganic materials. It has both physical and chemical bonds with pavement adhesion. Reactive inorganic system with self-shrinkage compensation and micro-expansibility strengthens physical interlocking. Chemical bonds are formed between polymer components and asphalt, which further improves the adhesion of base materials. In the past ten years, in the application of more than 5 million square meters in major and medium-sized cities in China, there has been no phenomenon of falling off of the base materials. Another advantage of Liluli is environmental water-based products, which makes it possible to immediately overlay even the asphalt pavement that has just been paved, greatly expanding the convenience of its application.
Abrasion resistance is composed of inorganic aggregate components and organic polymer emulsion components. With high polish value (PSV) and coloured aggregate, the new concept of "thin layer and wear resistance" is introduced. The wear resistance of the pavement in fact only depends on the surface 0.5-1mm. The overall 2-4mm thickness of the asphalt pavement can fully meet the needs of commuter service under repeated loading. It can be used in large load motor lanes such as color bus lanes, highway warning lanes, municipal color separation sections, etc. It can also be used in color landscape roads, sidewalks, urban greenways, beautiful rural roads and other places.
Colour-retaining hot-mix color asphalt often changes color mainly because of aging and softening of synthetic asphalt binder. Leehloring force is a semi-rigid thermosetting material, and there will be no high-temperature softening and sticking back phenomenon. Inorganic materials further improve its weather resistance. Combining with weather-resistant pigments, the color of Leehloring color pavement is as new as new after years, and after dust pollution rains, it is as beautiful as new. The color retention performance is superior.
Anti-skid asphalt pavement is usually paved by mechanical or artificial site. In the paving process, it can be combined with texture spraying, special drum hairing, and with the addition of aggregate with a certain particle size. It can form planar wire drawing anti-skid effect, texture spraying super anti-skid surface, special texture art surface layer, and satisfy the anti-skid property of various application sites on the basis of maintaining good cleanliness and aesthetics. 。
The difference between the color asphalt overlay and the color asphalt overlay is shown in the table below.
Application Prospects and Prospects
With the application of sustainable development and humanism theory in urban construction, color pavement has become an important factor in urban construction and development. Traditional urban street design and pavement technology can not meet the requirements of modern urban construction.
As two basic means of pavement colorization, hot-mixed color asphalt and leachate polymer color overlay technology have been applied on a large scale in China in recent years. As a new type of road material, hot-mixed color asphalt has been vigorously promoted by the industry several years ago. It is even considered to be the best way to complete road colorization at one time by using traditional production equipment and paving machinery. Over time, common quality defects such as aging, pitting, fading and cracking have generally appeared in practice. Experts in the industry have proposed ways to modify SBS or rubber asphalt. Through experimental use, the softening point and dynamic stability of SBS or rubber asphalt have been improved to a certain extent. However, the main resin still depends mainly on the synthesis of aromatic hydrocarbon-resistant Petroleum resin, and the anti-aging performance has been the development of the product. Bottleneck, an anti-aging idea is gradually recognized in developed countries such as Europe and the United States, that is, spraying a wear-resistant and weatherproof pavement coating on the completed hot-mix color asphalt surface to isolate ultraviolet rays in order to improve the aging resistance and color retention of the pavement. The coating is a water-borne polymer high wear-resistant and weatherproof base product (RD150), which can be directly sprayed on the newly completed color asphalt surface. Surface can also be used for the modification of old color asphalt pavement with certain color change or aging but good performance. The cost is reasonable, and it may be a direct and effective solution.
Liluli polymer color mask technology belongs to color preventive road maintenance technology. It has a history of nearly 30 years in Europe and the United States. It has been vigorously developed in our country for more than 10 years. Its long-standing color, convenient construction, good road performance and comparative economic advantages have been well reflected in the application of various fields, and will gradually develop into road color in China and even in the world. Mainstream technology and means in color industry.
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