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Drainage of the subgrade

It is of vital importance to keep water out of the subgrade both during compaction of sub-base/construction of sub-base and during the service life of the rigid pavement. The measures taken against high moisture content attributed to natural water table are similar to the ones applied for flexible pavements. As a rule of thumb, keep the water table at least 300 mm below formation level. [Pg.589]

The sub-base layer provides a uniform and even surface to support the concrete slab and assist construction works. Its thickness certainly contributes to the strength of the pavement but not as much as the sub-base/base layer in flexible pavements. [Pg.590]

The materials used for the construction of the sub-base are almost exclusively hydraulic (cement) bound material (HBM), as those used for sub-base/base in flexible pavements (see Section 10.5.7). The minimum compressive strength of the cement-bound material required for a rigid pavement design varies from country to country and may range from 3 to 10 MPa (7-day compressive strength). [Pg.590]

The use of HBM eliminates pumping of fines most certainly to appear in jointed concrete pavements after a period of time, if unbound aggregate material had been used and joint maintenance is delayed. Pumping causes edge or corner cracking at the joints. [Pg.590]

The compacted surface of the sub-base should be even with the required transverse slope to facilitate the construction of the uniform thickness concrete slab and economise on construction cost. [Pg.590]


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