If there is a slightly wet powder adhering to your fingers, you can lift the film when your fingers have a strong sense of consolidation on the surface and the aggregate does not fall off.
Pervious floor is a new type of environmental protection floor, which increases the comfort and safety of the city.
High frequency vibrator should not be used for tamping.
The washing shall be carried out to clean the cement and retarder on the surface of the aggregate and expose the true color of the aggregate.
Paving and pouring: Before pouring, the subgrade must be wetted with water.
After unpacking, the retarder shall be put into a bucket and stored in a cool place.
Mixing Put the metered stone into the forced mixer and add metered water for wetting.
Mix for three to five minutes and discharge.
For the sidewalk surface, large area construction adopts the method of block partition to pave materials, and the shovel and the benchmark are used for preliminary leveling.
As the pervious concrete is dry after discharging, it needs to be operated as soon as possible.
(The mixture shall be evenly distributed as soon as possible during paving.) Then use the cement trowel to smooth.
Add water for the second time, add cement and stir.
Arrangement of construction tools for formwork erection: operators need to wet construction machines and tools such as vibrators, trowels, spray guns, etc.
After mixing, all the mixture shall be poured out.
There should be no clear water in the trowel.
The cutting is required to be straight and not exposed.
What are the construction steps of the pervious floor and what should be paid attention to in the construction? Construction: On the basis of sufficient preparation, personnel and equipment can enter the site for construction.
Before construction, the foundation shall be wetted to increase the bonding strength.
1.
The water washing is required to be “low pressure fog type, multiple times of washing”.
Curing: after cutting, the scattered gravel on the surface shall be removed, and the color strip cloth shall be paved again for curing.
Due to the large porosity and fast water loss of permeable concrete, when the temperature of the day is higher than 35 ℃, the construction time should avoid noon and be suitable for construction in the morning and evening.
with water; Before unpacking, the retarder shall be kneaded and squeezed for several times.
The construction personnel shall divide corresponding professional construction teams.
For the first mixing, the mixture shall be prepared according to the ratio of water: cement: aggregate=1:3.3:17.9 without additives.
During paving, use a ruler to find out the flatness and control a certain degree of flashing.
Concrete mixing for construction: after the first initial mixing, the subsequent mixing products are all construction materials.
(Strictly control the proportion of ingredients) The change of proportion will affect the cement viscosity, form dead holes, and affect the strength and water permeability.
Source: Internet.
Precautions: 1.
After the surface concrete is formed and dried, the transparent sealing agent shall be applied for about 3 days to enhance the durability and aesthetics and prevent the porous concrete from being polluted and clogged by excessive time.
Otherwise, rapid moisture loss of permeable floor will weaken the bond strength between aggregates.
5.
After wetting evenly, add cement with measuring mark above 42.5 to mix until the cement is evenly covered on the stone.
Put aggregate, cement and additives into the mixer truck in proportion, and pour them into the drum for dry mixing; Then add water and continue to mix to make qualified slurry.
Generally, the transportation time of the mixture is controlled according to the climate conditions.
Besides, the plate vibrator should not be vibrated for too long to prevent excessive compaction and segregation.
The templates are placed and fixed along the snapped ink lines.
3.
4.
(Note: The curing time shall be determined according to the construction temperature.
The transportation is generally controlled within 10 minutes.
Permeable concrete belongs to dry concrete material, which has fast initial setting and must be paved in time.
Angle steel or steel templates are used for the templates of straight or slightly curved road sections, and flat steel templates are used for the templates of curved sections.
Select the mold style according to the measurement data.
When transporting pervious concrete mixture, the setting is fast.
Slowly add the remaining water in the mixing process.
In urban construction, many cities use cement, asphalt, concrete and other closed floor materials to replace the original soil surface, which also has a significant adverse impact on urban ecology and climate.
Finally, use a trowel to level it.
Joint cutting: after the water is cleaned, the expansion joint and settlement joint shall be cut according to the specification.
3.
When lifting the film, generally lift the film of 6-10 square meters, wet the road surface with a spray gun in a low pressure fog, and then adjust the water pressure for careful washing.
Pervious floor, as a new type of environmental protection floor, plays a great role in promoting urban construction.
2.
Use a plate vibrator to tamp.
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2.
When the air temperature reaches 35 ℃, the construction shall be stopped, or sooner or later.
Water washing: After curing for 22-24 hours, lift a corner of the film and touch the surface with your fingers.
Its construction still needs to be strictly controlled, so as to make a permeable floor with good permeability.
Curing and painting: the inner wall of the formwork shall be painted and demoulded for curing.
The general curing period is 14-21 days, not less than 14 days at high temperature, not less than 21 days at low temperature, and not less than 28 days for construction below 5 ℃.) 6.
Do not stay during the transportation, and the trolley must be stable.
