Characteristics and Causes of Disease asphalt road

[wangkiky]

<P> China's current asphalt pavement is more common pavement structure, with smooth surface, solid, seamless, driving comfort, wear-resistant, low noise, short construction period, easy maintenance and repair can be absorbent, and is suitable for the construction stage etc., it is widely used. However, due to differences in asphalt concrete material itself, as well as affected the design and construction standards, the asphalt tends to crack, rutting, loose, frost boil and heave, subsidence, pro package eight kinds of common diseases weeping, cracking pulp pump . The emergence of these diseases seriously affecting the driving speed, traffic safety, increase the car wear and shorten the service life of asphalt pavement. </P>
<P> The first cracks. Asphalt pavement built early, inevitably will produce a variety of forms cracks. Early crack generation does not substantially affect the performance of asphalt pavement, but with the rain and the intrusion of external forces role, will gradually asphalt pavement structural damage. From the crack manifestations divided into horizontal cracks, vertical cracks and mesh three kinds of cracks. Reasons are as follows: </p>
<P> 1, transverse cracks, often due to temperature stress, fatigue cracks in pavement. This temperature cracks often start at the maximum rate of change of the temperature of the surface and extending down quickly, and grow over time, causing the asphalt aging, anti-crack ability asphalt surface gradually reduce the temperature cracks increases. </P>
<P> 2, longitudinal cracks, mainly due to the unevenness of the foundation and filling, especially in the old roadbed broaden the area, due to the soil level process is not standardized, stratified filling thickness and degree of compaction control is lax. </P>
<P> 3, reticular cracks, mostly because of early cracks in the road surface by water infiltration, erosion, slurry pump, resulting in the center seam subsidence deformation, while generating new cracks or chipping damage. </P>
<P> Second rut. Mainly Pavement Structure and soil compaction under road base supplementary repeated loads, so that the lateral displacement of the structure layer material, resulting in the accumulation of permanent deformation. Its causes are mainly four aspects: 1, asphalt aggregate ratio is too large; 2, excessive wear surface; 3, water intrusion inside the asphalt concrete; 4, the base layer containing unstable dissection, resulting in the formation of the waveform Sideway push rut. </P>
<P> The third is loose. Loose asphalt pavement of common diseases, a direct impact on traffic safety. General performance, the surface layer of the aggregate particle shedding, weight loss from the sand aggregates, road wear, road surface burlap, skin peeling, if not control, the formation of pits down from the road surface. Loose road surface may appear throughout. It may also appear in the local area, usually in the wheel tracks with relatively serious. Its main causes are the following seven aspects: 1, less than normal asphalt mix asphalt, aggregate ratio is low, between asphalt and aggregate poor adhesion; 2, low temperature construction, a small degree of compaction, the asphalt surface of internal voids rate is too large; 3, aggregate clay content exceeded the aggregate particles are wrapped in the dust, so that the film can not be bonded to the asphalt aggregate particles; 4, when the mixing temperature is too high, resulting in asphalt aging; 5, soft and grassroots surface cracks caused by loose; 6, mistakenly chose acidic aggregates, asphalt and poor adhesion; 7, the water gradually infiltrated into the asphalt and aggregate interface, reducing asphalt adhesion and adhesion. </P>
<P> Fourth of frost heaving boiling. Mainly in the thaw period, because the water stability ingress of water and poor soil subgrade, embankment after the accumulation of moisture freezing causes the upper surface bulge and crack. If not promptly treated, to the heaving pavement when completely melted, under the weight of the vehicle will produce Frothing, traffic safety is a great risk. </P>

<p>Related Sites:<br />
<a href="http://roadcuttingmachine.com/blog/2529.html">Maintenance Of Concrete Roads Supertable Material Handling</a><br />
<a href="http://roadcuttingmachine.com/blog/3525.html">Low Cost Repair Tools Polished</a><br />
<a href="http://roadcuttingmachine.com/blog/262.html">Belt conveyor Type Concrete Batching Plant</a><br />
<a href="http://roadcuttingmachine.com/blog/191.html">vibratory plate compactor</a>
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[willpwns]

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