"Slurry" and "asphalt surface" is a common method of road maintenance. This two look similar, They lay down a new layer of asphalt concrete on the old road and also play a role in protection of road structure. There are a lot of people confused them in project. In fact, This two are different no matter from material or construction technology. Today, we will help you to distinguish difference in this two technologies.
Let’s talk about cover
Ah, we are talking about "slurry" and "asphalt surfacing"? Why mention cover face, is that make us more confused?
Don't worry, we must talk from ‘cover” to distinguish between "slurry" and "asphalt surface treatment". In "highway asphalt pavement maintenance technical specifications" (JTJ073.2-2001) description of cover is:
When old pavement strength indexes meet requirements, overlaying thin layer of asphalt mixture to old asphalt pavement, called asphalt pavement surface. According to using function is divided into cover (common type), seal (waterproof) and anti slip layer (sliding type).
Common surface transformation, generalized cover is a big concept, below contains "ordinary cover" in the narrow sense, "slurry" and "asphalt surfacing technology". These cover technologies have a lot of similarities, such as:
(1) They are thin layer of asphalt mixture on the old asphalt pavement.
(2) They must be used in old pavement which strength meet demands.
(3) They are relatively thin, generally not included in thickness of bearing layer
(4) They all play a role in improving the quality of the old pavement, such as reducing net crack, improving the smoothness, improving the anti sliding performance, waterproof infiltration and so on.
Then talk about slurry seal
Slurry seal is one of surface construction technology, whether it’s cement pavement or asphalt pavement, parking urban roads, general highway or speed highway are applicable.
In theory, new and old pavement can adopt slurry seal technology, but old road maintenance is most widely used, especially for early aging, pavement cracking, rutting, loose, polish and other diseases by slurry seal, can quickly repair the pavement, rut filling, improving smoothness, water proofing and anti sliding properties of pavement.
Characteristic of slurry seal is mixing and paving of slurry mixture in construction site under normal temperature. Compared with hot mixed asphalt mixture, it’s no need heating, cooling and roll forming. That is to say, slurry seal’s characteristics, one is general temperature, two is mixing.
Slurry seal technology
Slurry seal technology invented in 1830s by German, twentieth Century 60s spread rapidly in Europe and the United states. 20 years ago, China began to contact slurry seal technology. When faced what’s name in Chinese with "Slurry seal coat", literal translation should be "mortar seal" or "asphalt mortar seal".
But Mr Jiang Yunhuan led cationic emulsified asphalt and its pavement performance of national key research group "from the actual situation of the project, slurry mixture is different from building mortar, asphalt mortar is also different fromthe general, according to technical characteristics of “Slurry seal coat” for slurry seal.
From then on, dilute the four characters of slurry seal became to emulsified asphalt as binder, a term used in normal conditions, with thin field mixing surface construction technology field spread.
Difference between Asphalt surface and slurry seal
Asphalt surface treatment surface is referred to as "," technical specifications for construction of asphalt pavement in terms in China has become synonymous with layer. Refers to method of layered pouring asphalt, aggregate, spreading, rolling and forming. The main characteristics of table is collection of material and spread, asphalt spraying carried out alone, no filler without mixing.
According to need is making a single layer or two layer, three layer. Sprayed asphalt can be a hot asphalt, can be emulsified asphalt. In construction of table, the use of stone chips, asphalt distributor, roller and so on.
Asphalt surface treatment (spraying paving separately) mentioned before, although the slurry seal and asphalt surface is mask technology, but they have different technology. Keywords slurry seal is mixing, asphalt surface keywords are spread out, spraying. You can use the hot mix asphalt surfacing technology, and slurry seal is required to mix the materials at room temperature. In addition there is a little difference, early development, slurry seal in Germany, widely used in the United States; and the surface seal is widely used in france.
Misleading the micro table place if you already understand the difference between the dilute slurry seal "and" asphalt surface ", then we'll introduce a new guy" micro surfacing". Don't be too literally, "micro surfacing" although there is a table at two words, but from the process point of view, it is more close to the "slurry" rather than "asphalt surface". Even from a certain extent, the "micro surfacing" is the "slurry" upgrade edition.
Micro surfacing construction is more close to slurry seal
Why"micro table place" called this name? In fact, this is deviation of translation.
The invention of dilute slurry seal technology, a technology upgrade. To replace the ordinary emulsified asphalt to polymer modified emulsified asphalt, aggregate material requirements of one hundred percent of the artificial crushing. The proportion of new additives, more sophisticated, the biaxial stirring mixer, mixing more fully, better sealing effect can be obtained, is considered to be the most economical processing method of pavement early disease. Foreign the improvement of slurry seal called Micro-Surfacing.
This is a combination of words. Separate to look at the words: Micro meaning: fine, micro, one million meters; Surfacing meaning: surface dressing, pavement repair. Some foreign enterprises according to the Chinese marketing and communication, translators translate Micro-Surfacing into "fine pavement treatment" and "micro surfacing" or "fine table" and other names. Later, gradually fixed into what we often say today, micro table technology". But to trace its source, and the asphalt table is not a matter of.