subject: The Application Of Crushers In Cement Industry [print this page] Concrete pavement is durable, and able to adapt to modern high-speed, overloaded dense motor transport requirements, maintenance and repair costs are less, so in the field of airport runways, highways, trunk roads, urban roads, factories, mines, road and stop to use more and more. It is also especially suitable for the road inside the tunnel and over the water road.
The stability of the soil base and the grass-roots level and the durability of solid concrete pavement. Since the 1960s, emphasized the use of cement, lime or bitumen stabilized soil or granular material, industrial waste, asphalt mixture or lean concrete for concrete pavement, grass-roots to a thickness of 15 to 20 cm, width over each side of the concrete slab width 25 to 35 cm or more. The degree of compaction in the top 60 cmdepth of soil base to more than 98% of the optimal density. In the frozen region, but alsounder at the grassroots level, and the other of 30 to 80 cm thick gravel or slag frost layer. Between the primary and the concrete slab, laying one to two centimeters thick, tar sands or plastic film; such as the primary surface is flat, and can also be pouring concrete on the grass roots.
The materials used for cement concrete surface layer of plain concrete, reinforced concrete, and continuously reinforced concrete, steel fiber reinforced concrete, roller compacted concrete.
Preparation of the pavement with concrete, soft training 425 or 525 ordinary Portland cement, sand or grit in and grade broken (gravel) stone. 28 days of concrete ultimate compressive strength of not less than 30 to 40 MPa, ultimate flexural tensile strength of not less than 4.5 to 5.5 MPa, the amount of cement per cubic meter of concrete for 300 to 350 kg. The lower of the two-tier concrete pavement materials may be appropriate to reduce the requirements. To improve the performance of the use of concrete can be mixed with a small amount of early strength agent, plus gas agents, plasticizers, water reducing agent or polymer admixture (see concrete admixtures).
In the upper part of the irrigation seams fillers commonly used in asphalt, slag, asbestos dust, soft wood chips or rubber powder, the appropriate ratio of asphalt made of clay(also known as asphalt mastic). Also chloroprene rubber hollows belt, plastic moldings or polyvinyl chloride clay filler, the better.
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