As an environmentally-loaded additive concrete, permeable bricks
are a creative material for improving and healing the damaged global environment, enabling human life to coexist in harmony with nature and unfolding in a sustainable manner.
Keywords: permeable brick
; park road; water saving; cooling; noise reduction
3.3 Concrete mixing ① The mixing of permeable bricks
must be severely suspended according to the cooperation ratio, and no wrong investment or wrong investment can be made.
The first batch must be weighed, and then it can be marked in the feeding machinery container, and the batch can be fed according to the standard.
② Feeding: In the mixing machine hopper, put 1/2 stone first, then cement and additives, and then add 1/2 stone, that is, it is more appropriate to keep the cement and additives at the two ends of the stone.
③ Mixing method: Put 20% of the water consumption in the empty machine first, mix with the empty machine, and then increase the hopper feed.
Add water several times during mixing and mixing until the water-cement ratio is finished.
Suitable bricks mixed with water can be lumped by hand. After the hand is loosened, there is less adsorption of slurry on the surface of the hand.
④ The mixing time is from feeding to discharging. In general, the 350 type mixer is 4 minutes.
The Model 500 Forced Mixer is 3.5 minutes.
3.4 Product material transportation The mixed product materials should be transported to the construction site in time after the machine is out of the machine. It should be transported to the site for construction within 10 minutes.
When the temperature is higher than 300C, the concrete must be covered and adhere to the moisture to prevent the water from transpiration and affect the construction quality.
Permeable concrete construction rules and regulations, the transport time of pervious concrete to the mission surface should not exceed 30 minutes.
3.5 Permeable concrete paving construction Permeable concrete paving construction, priority should be given to determining the position of the expansion joints in the construction of the structural layer, and the rule scale [set up every 5 meters]. Make signs, leave them in accordance with requirements, and use them after paving. The low-frequency slab is compacted and compacted. The compacted surface should conform to the planned elevation to ensure the construction thickness of the surface layer, which is required to be flat and dense.
The inflated expansion joints are embedded in the shaped oak plastic material.
The surface layer construction must calculate the loose paving height, and the reasonable control of the height can make the compaction and the surrounding paving material [or formwork]. The height does not match, which is in line with the planned elevation of the road surface. After the loose paving is flattened, a low-frequency hydraulic mission station is used to stop it. Rolling and rolling to ensure the compactness of the pavement concrete, thereby ensuring the strength of the concrete.
After rolling and flattening, it should be smoothed with a concrete polishing machine in time. The center that cannot be ground by the peripheral grinder should be smoothed by hand. The surface should be flat, the stones should be evenly distributed, and there should be no missing stones to prevent the accumulation of slurry.
There are two construction methods for the construction of permeable concrete pavement. The first method is continuous construction. When the volume of the single layer of the structural layer is satisfied with the shrinkage requirements, the surface layer is paved immediately. This construction method makes the structural layer and the surface layer bond. Robustness does not simply result in the phenomenon of hollow drums, but simply destroying the structural layer cannot guarantee the strength of the concrete in the structural layer. The structural layer should not be damaged during construction.
Another method is the interval construction method, which is to lay the structural layer in the morning and the surface layer in the afternoon.
This method can ensure the strength of the concrete in the structural layer and has a small impact on the cross-construction. It can also add mixing machinery and reduce the mechanical and manual inputs.
However, when the surface layer is fully wetted with water during the construction of the surface layer, a plain cement slurry is used as the adhesive layer to prevent the occurrence of hollowing.
When the surrounding area of the permeable concrete construction is a pavement belt, priority should be given to the protection mission of the products in the previous process, and a plastic film covering method can be selected for protection.
3.6 Protecting the permeable concrete The protection mission after molding is an important part of the construction of permeable concrete, because the inorganic cementitious material is added to the permeable concrete, and the strength of the concrete increases rapidly in the late stage, and the surface layer needs to be protected in time.
The method we adopt is full cover protection of the plastic film, that is, the plastic film around the surface layer is larger than the surface layer by more than 50cm, and the overlap width of the plastic film is satisfied by more than 20cm. Wet water on the masked film to make the film uniformly covered. On the level.
In addition, the film cannot be damaged. Part of the damage directly causes a lack of protection, and the phenomenon of dripping will occur. The protection period of the permeable concrete is two weeks. Watering protection must be guaranteed more than twice a day. It is not a shortage. The best effect of protection is It is best to have a few dewdrops in the film.
The film cover and protection must be firmly pressed to prevent the wind from forming the film to float, and there must be no air leakage, and the permeable concrete of the component is damaged.
The center of the film that is not tightly covered or floating should pay special attention to the sand or falling off at different levels, which constitutes the defect of the product.
3.7 Cancellation of formwork After the protection period has expired, the strength of the pervious concrete has reached the standard, and the formwork can be suspended. During the revocation process, the edges and corners of the concrete pavement must not be damaged, and the pervious concrete block must be damaged.
3.8 Cutting and caulking When the strength of the permeable concrete reaches 70% control [2 weeks below 10 ° C in winter, 10 days in spring and autumn, 3.5 days in summer], mechanical cutting can be suspended.
The thickness of the mechanical slit must be satisfied with the penetration of the thickness of the surface layer.
After cutting, the stone powder in the joint must be flushed with water in time to ensure that the joint is clean and free of dust, and the mud on the concrete surface formed during the joint is washed away.
When cutting to the expansion joint, insist that the seams of the structural layer and the surface layer do not match up and down.
The setting of the area of the single block shrinkage first meets the planning requirements. Secondly, it must be in accordance with the standard rules of 25㎡ ~ 30㎡, and it must not exceed 30㎡. It is best to be controlled within 25m2. If the area is too large, the concrete surface layer will crack and even crack. There are empty drums.
For the filling of expansion joints, a shaped oak plastic material caulk is used, and the contracted seams are filled with a shaped oak plastic material. The surface of the seam when filling is reserved with a height of 2 ~ 3mm, and then injected with structural glue to close the width of the seam. Non-conformity, flat surface and good look and feel, so the caulking material must have strong adhesion, good resilience, adapt to the shortening and swelling of concrete, and be insoluble in water, impervious to water, resistant to aging, not flowing at low temperatures, and not at high temperatures. Brittle.
3.9 Pavement spray paint The surface pavement spray paint is a curing agent pavement paint. This paint layer has bright colors, good look and feel, strong UV resistance and good durability.
The spraying machine is an airless sprayer. An airless sprayer can finish the control of the painting area of 700 ~ 800㎡ for 8 hours a day, and the unit paint consumption per square meter is 0.15kg [including curing agent].
When spraying paint, the surrounding previous process materials should be protected. It can be posted with tape or covered with steel [wood].
Must be edge-to-edge, curved lines, beautiful and stingy.
When adjusting the paint, make sure to mix the ratios together to prevent the occurrence of color aberrations. When spraying paint, the overlap should be different.
3.10 Product protection Permeable concrete pavement During the construction and protection process, product protection must be taken seriously. The pavement should be severely stopped to stop the people, plants, and vehicles from driving. The practice is to set up fences around the formed pavement, insert flags, and make it clear. Symbol, and a special person is placed on duty to protect the product from invalidation.
Permeable concrete is different from general concrete in that it is difficult to repair and the surface is not simply bonded to the extent of cost. Therefore, product protection must be continued until the completion inspection is handed over to the front.
4 Concluding remarks In the natural environment, the natural environment is the basic condition for human life and the foundation for the development of consumption and the prosperity of the economy. Therefore, protecting the ecological balance is related to the basic results of human day and social development.
Each city represents the prehistory of civilization and the level of urban civilization in the field. It requires people to pursue with care in the establishment of the city, actively promote environmentally friendly and healthy new ecological products, and build wonderful homes together.