2. Pouring: Before pouring, the subgrade must be wetted with water. Otherwise, the rapid water loss of the permeable floor will weaken the bond strength between aggregates. Because the mixture of permeable ground is relatively dry and hard, it is possible to mix permeable ground and good permeable ground materials on the subgrade.
3. Vibrating: It is not advisable to vibrate or tamp strongly during pouring. Lightly vibrate the paved permeable concrete mixture with a flat vibrator, but it must be noted that high-frequency vibrators cannot be used, otherwise it will make the concrete too dense and reduce the porosity, which will affect the permeable effect. At the same time, the high-frequency vibrator will separate the cement paste from the surface of coarse aggregate and flow into the bottom to form an impermeable layer, which will make the material lose its water permeability.
4. Rolling: After vibrating, the permeable concrete mixture should be further compacted and leveled with solid steel pipe or light roller. Considering the consistency of the mixture and the surrounding temperature, it may be necessary to roll it several times, but it should be noted that the roller must be cleaned before rolling to prevent the aggregate from sticking.
5. Maintenance: Water maintenance shall be started 1 day after the permeable ground is poured. It is not suitable to spray water with pressure water column on the concrete surface, which will take away some cement slurry and cause some weak parts, but it can be watered directly from top to bottom under normal circumstances. Watering and curing time of permeable ground shall be no less than 7 days.
Extended data
The construction of permeable concrete mainly includes paving, molding, surface treatment, joint treatment and other processes. Mechanical or manual methods can be used to pave the road; Molding can be carried out by using flat vibrator, vibration leveling roller, manual push-pull roller and vibration leveling beam.
Surface treatment is mainly to improve the surface impression, and to trim or clean the formed permeable concrete surface; The joints of permeable concrete pavement are basically the same as those of ordinary concrete, and the contraction joints are equally spaced, and the spacing should not exceed 6m.
After the permeable concrete is constructed, it should be covered and cured with water for at least 7 days. During the curing period, the pores on the concrete surface should be prevented from being polluted by sediment. The daily maintenance of concrete includes daily cleaning and hole sealing cleaning. Blocked pores can be cleaned by blower blowing, high-pressure flushing or vacuum cleaning.
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