In the construction of cement concrete pavement in summer, due to the influence of climate conditions, cracks and plate breakage are more likely to occur.

1) avoid the period of high temperature.

According to the specification for cement concrete pavement construction and acceptance, when the temperature of concrete mixture is 30-35 ℃, it shall be carried out according to the summer construction regulations.In summer construction, 11:30 -- 14:30 is the time when the temperature is the highest in a day. If the construction is carried out at this time, it will have a certain negative impact on the pavement concrete: first, under high temperature conditions, the hydration heat of concrete will be generated intensively in a short time, resulting in concrete strength cracks.Secondly, concrete aggregates exposed to high temperature contain a large amount of heat energy, which makes the temperature of concrete entering mold too high and affects the balance of stress and strain in concrete, thus forming cracks.Therefore, when the temperature is too high should avoid construction at noon, as far as possible in the night, this is to prevent cracks and broken plate the most effective method.

2) the finished concrete slab surface can be sprayed with curing agent and covered by canopy to prevent exposure to the sun, so as to avoid the surface losing water too quickly and forming dry shrinkage cracks.

Cement concrete in the hardening process, cement concrete itself will shrink, contraction is limited and the occurrence of contraction stress, it is easy to produce dry shrinkage crack, resulting in the phenomenon of plate breakage.Therefore, measures should be taken as soon as possible to avoid sun exposure after the plate surface through precausions, to reduce the evaporation of water on the surface, to prevent the occurrence of dry shrinkage crack.

3) during the construction in summer, it is necessary to timely cut the cracks on the board surface so as to release the tensile stress generated inside the concrete board and avoid the phenomenon of broken board.Concrete hardening process accumulated a lot of heat energy, make plate temperature rise, strength rise faster, if not timely cut seam, will inevitably lead to the generation of cracks, so the construction personnel should pay attention to observe the plate situation at any time.

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