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Common cracks on airport cement concrete pavement include surface turtle cracks and through cracks, and the reasons are as follows:
1, surface turtle crack: when the cement concrete pavement is constructed in high temperature or windy weather, the surface moisture evaporates too fast; Or after the surface of cement concrete pavement is brushed, the wet curing of geotextile is not timely, which makes the surface lose water too fast at the initial stage of pouring or solidification, which will produce reticular shrinkage cracks on the pavement surface.
2. Penetrating cracks: Penetrating cracks, commonly known as broken plates, are generally not easy to appear. The main reasons are as follows:
(1) Cracks in water-stabilized base course cause reflection cracks in pavement plates.
(2) In the process of cement concrete pouring, after the construction was interrupted for a long time, the closed head was not treated and paving was continued, resulting in uneven shrinkage and fracture at the joints.
(3) When pouring cement concrete, the water-cement ratio on the same section is quite different, which leads to uneven shrinkage cracks at the interface.
(4) The dowel bar placement does not meet the requirements, which increases the shrinkage and tensile stress.
(5) The joint cutting is not timely, and the cement concrete shrinks and breaks in the process of condensation and hardening.