How to control the smoothness and finish of concrete construction on the ground floor？
Henry Wang
CEO @ Global Marketing Club | Competitive Pricing, Professional Manufacturer | Since 2007, Bridging the gap between 200K+ Chinese manufacturers and overseas buyers.
Control of surface concrete construction smoothness and finish
On the surface of the factory floor, the original concrete surface is mixed with hardening agent to increase its surface hardness. In the construction process, after simple treatment (scraping with long scale and rolling with roller) and special mechanical trowel surface polishing before initial setting, the surface hardness after curing can meet the bearing requirements of heavy load without damage.
For this kind of practice, on the one hand, it saves the cost of an additional 20mm thick cement mortar overall surface layer on the floor surface, thus saving the investment; on the other hand, because the thickness of 20mm cement mortar overall surface layer is reduced in the case of the same structure height, so as to increase the headroom height by 20mm.
On the other hand, this approach reduces design difficulty. Because the delta area is mostly soft soil foundation, the bearing capacity of the foundation is relatively weak, so the bearing capacity of the foundation treatment cost is relatively high compared with the whole project cost. The cement mortar density is calculated as 2000kg/m3, and if the weight of a 20mm thick overall mortar surface layer is reduced, Therefore, the weight of the structure is reduced by 1×1×0.002×2000=40 (kg) per square meter of construction area, and the design standard value of the uniform ground load of the plant building is 3000kg/㎡, so it is equivalent to reducing the load 40/3000=1.33%, so that the cost of foundation treatment is correspondingly reduced. Thus reduce the construction unit investment and design unit design difficulty.
Moreover, the construction is convenient. Relative to residential building shear wall structure, with a diameter of 1 m disc finishing machine for silicon carbide surface processing, expounded the plant has enough surface operation, in addition to the ground and building column summer-planting need to manually further grinding, mechanical operation, can be reduced by workers technical quality can not meet the requirements of precision is lower.
Analysis of construction difficulty of one-time forming concrete floor
1.1. The current specifications do not mark the quality acceptance standards for one-time formed concrete floors. According to the construction quality acceptance of concrete engineering, on the concrete floor (floor) roughness requirement is 8 mm, generally can meet, but only in the construction process can reference to acceptance criteria can only according to the building ground engineering construction quality acceptance specification of mortar floor flatness (4 mm), so, for example, in the case of construction unit, Compared with mortar surface, it is more difficult to construct one-time concrete floor.
1.2. As the design requires that the superstructure can be constructed after the ground is formed once, the possibility of damage to the formed ground is very high in the construction process. Column and ring beam as well as steel roof frame construction in the process of erection and demolition are likely to destroy the formed ground, resulting in product protection of technical measures cost and management difficulties greatly increased.
Control measures
Reinforcement assembling finished, place the level around the scene, elevation, introduced by the control points in every 4 m * 4 m floor steel welding, a vertical direction of the steel reinforced truncation in forming the ground elevation position, pouring concrete is controlled by a bare steel head forming the ground elevation, cast concrete thickness is slightly higher than the steel head, then vibrating close-grained, Then, with the reinforcement head as the mark, check the flatness, and then check the elevation at the second long ruler scraping time, to ensure that the elevation error is controlled within 4mm. After the initial setting of concrete, began to do emery ground, and in the position of the vertical steel bar with a wooden trope to rub and wipe, the emery and concrete slurry mixture, so that the surface layer to achieve close combination.
Emery ground molding, to implement good product protection technical measures, to achieve the strength of the two to three days required watering and maintenance, and cover 2 to 3 layers of film, to prevent the rapid evaporation of water while playing a role in protecting the ground. In the follow-up construction process of the main structure, manual lifting should be carried out on the materials, and throwing is strictly prohibited. When hoisting the steel roof truss, as the truck crane must enter the plant interior, the ground is required to be paved with sand 20mm thick, and two layers of 10×10 wooden tiebeams are crossed under the truck crane support frame to prevent the ground from being damaged by excessive concentrated load.
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