Key Points Of Concrete Floor Construction

Preliminary process principles

Special mineral aggregate is evenly laid on the surface of the concreted concrete to make it into a whole by pressure smoothing, so as to obtain a colorful wear-resistant floor with thickness of about 2 mm and good wear resistance, dustproof and aesthetic performance.

 

The process and operation point

  1. Compaction of foundation → setting of formwork → pouring concrete → surface levelling → spreading of material → disc work → mechanical work → mechanical plate work → surface polishing work → ground maintenance → shrinkage joints → cutting.
  2. Concrete floor construction.

(1). For concrete requirements.

1). Strength is above c25.

2). The water-cement ratio is not higher than 0.5.

3). The particle size of concrete aggregate is determined according to the thickness of ground, and the largest particle size of aggregate is less than 1/4 of the thickness of concrete ground.

4). The slump of concrete mixed on site should be controlled at 3~4cm, and the slump of pumped concrete should be controlled at 18 soil 2cm.

(2) concrete pouring

1). Pumped concrete should be poured in partition and in order, otherwise it will be impossible to operate the machine for large-scale construction due to unbalanced concrete setting.

2). The concrete floor with colored wear-resistant material should be poured to the design elevation in one time. In the place where the concrete is poured, if no waterproof membrane is laid, water should be sprinkled to make the grass-roots level in a wet state.

3). For the concrete floor constructed on the concrete slab, the thickness of the surface concrete reserved for pouring layer should not be less than 50mm.

4). When the second pouring, the ground should be chiseled first, and completely remove dust and debris. Sprinkle water to make the base layer in a moist state, so that the after-pouring layer and the first concrete layer can be well integrated. It will be better if a binder (such as baraemuls10n57) is applied.

5). Vibratory tamping: Use the inserted vibrating rods and horizontal vibrators for vibratory operation, and pay special attention to the corners to make sure they are solid. Use during concrete tamping

The level meter will detect the level of the formwork at any time and adjust the deviation part.

6). Ground level: Use 200m diameter steel rollers filled with sand (the width of steel rollers is 500mm above the width between expansion joints), and roll the ground repeatedly to make the ground level. When rolling the ground, the foreign matter on the steel mold should be removed. In the part that can’t be operated by steel roller, the ground plane should be made by scraping bar. The ground plane elevation should be checked and confirmed by level. Concrete ground level must be controlled within the error of lmm / m.

7). Remove the secretion: After the ground leveling construction is completed, 4 meters (not less than two channel steel spacing between) scraping bar should be used at least twice to scrape off excess secretion.

Key Points Of Concrete Floor Construction

Construction of colored abrasion resistant ground surface should be started after the concrete ground is leveled and water is removed until the surface processing is finished

1). The pre and middle operation phase should be carried out at the initial setting phase of concrete with concrete compressive strength of 1.2n/mm2, the later operation phase should be carried out 2 to 4 hours after the initial setting phase with concrete compressive strength of 1.5n/mm2, wearing waterproof kraft paper shoes.

2). The construction of colored wear-resistant ground must be completed by the professional operation of special mechanical plate. The mechanical plate is divided into the disc and the special trowel.

Two kinds of mechanical plate, replace the corresponding spatula according to the degree of solidification of the ground.

3). Remove floating pulp: During the initial setting period of concrete, set up a special person to watch over the concrete surface, press the concrete surface lightly by hand, and when the depth reaches 1-2cm, use the mechanical plate with disk installed (wooden plate is not used everywhere at the edge of template and mechanical plate construction contact) to scrape off the floating pulp film on the concrete surface evenly.

4). Scattering material: Operators should wear waterproof shoes made of kraft paper, spread 2/3 of the specified amount of colorful wear-resistant material evenly on the surface of the first-set concrete by hand, and finish the first scattering operation. After absorbing half of the moisture of the colored wear-resistant material, proceed to the operation of adding discs to the concrete surface. After that, when the colorful wear-resistant material hardens and there is no obvious mark on the surface, carry out the second spreading operation, spreading 1/3 colorful wear-resistant ground material with specified amount.

5). Disc operation: After colorful wear-resistant material absorbs water of concrete below, then proceed at least two times to add disc mechanical plate operation, mechanical plate operation should be longitudinal.

6). Mechanical plate work: In the future operation, depending on the hardening of concrete, at least three times to install special spatulas for mechanical plate work. The speed and angle of the mechanical board should be adjusted according to the hardening of the concrete floor. The greater the strength of the concrete, the greater the angle of the mechanical spatula. Mechanical plate operation should be staggered vertically and horizontally.

 

7). Surface polishing operation: The final finishing processing of the color wear-resisting ground is done by using mechanical plate or by hand pulling plate processing once. In addition, according to customer’s request

Stagger the work horizontally

To achieve different surface finishes and anti-slip requirements. Generally, the project is completed 2 to 4 hours after the initial setting of concrete and the compressive strength of concrete is 1.5n/mm2.

Key Points Of Concrete Floor Construction

Color wear-resistant ground maintenance

1). Coat special preservative and cover plastic film on the surface of colorful wear-resistant ground in 5-6 hours after the surface polishing is finished, in order to prevent the rapid evaporation of water on the surface and guarantee the stable growth of wear-resistant ground material strength. The maintenance period of the ground is generally 7 days.

Expansion joint cutting.

The expansion joint cutting operation can be carried out when the concrete strength on the colored wear-resistant floor has reached 30% of the design concrete strength standard. The width of the cutting joint is 5 mm, the depth is not less than 10 cm, and type a cold sealing paste is poured inside the joint.

 

Repair method of colored wear-resistant ground

If there is damage to the wear surface after the wear surface has been applied or the equipment has been installed, it can be repaired as follows.

1). 12 mm repair. (subjected to rain.) (repair of minor damage) material: Colorful wear-resistant floor aggregate, ethylene vinyl acetate copolymer emulsion.

Construction method: Clean the patch surface. Mix water and ethylene mono vinyl acetate copolymer at a ratio of 2:1 and apply as a base coating on the work surface. Sift the colored wear-resistant floor aggregate through a 5-mesh standard sieve. Mix water and ethylene vinyl acetate copolymer emulsion in a ratio of 5:1 and add it to the non-aggregate colored wear-resistant floor material. If there is a preservative, use a small brush to finish the surface after it hardens.

2). Repair the deep place where the area is over 10mm and over 1㎡. Material: Colorful wear-resistant ground aggregate. Construction method: Cut off the surface to be repaired to a depth of 1 cm, put in steel mesh with a diameter of 6 mm and a spacing of 200 mm, and pour fine stone concrete. When the concrete is not hardened, spread the coloured wear-resistant flooring and finish the surface with a metal trowel. If a curing agent is available, it is sufficient to finish the surface with a small brush after it has hardened. (since there will be marks on the patch, for aesthetic reasons, the patch may be neatly cut and repaired later. Even this will leave marks, so it is best to strengthen the protection of the finished product after the floor is finished.)

Key Points Of Concrete Floor Construction

Key materials

1). Cement must be ordinary portland cement, its intensity level should not be less than p.0 32.5; sand and stone should be clean and without impurities. Sand should be medium sand or coarse sand, and the diameter of gravel should be controlled within 10~31.5㎜.

2). Colored wear-resistant surface layer material is special mineral aggregate, which is composed of two kinds of components: One is hard wear-resistant quartz sand aggregate with certain grade after special processing. The other is special cement with water-reducing agent, diffusing agent and reinforcing agent, which has the following properties: 1) surface strength is over 68mpa. 2) abrasion resistance is 4 times that of ordinary concrete. 3) molar hardness is over 7.

3). Mormon hardness is more than 7. 3. A type a cold sealing paste is used for ground expansion joint filling.

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