Technical measures for integrated construction of wear-resistant and hardened floors

People in the floor industry usually know epoxy floors and emery floors, because epoxy floors are the first to be known, epoxy floors have good performance, rich colors can be combined to form different >

First of all, no matter what kind of raw material, the emery floor must be sprinkled when the cement or concrete is still wet, so that a chemical reaction can be formed and a good effect can be achieved

01 Requirements for performance parameters of concrete for floors

Water-cement ratio: ≤ 0.

Amount of cementitious material: not less than 360kg

Slump: 140±20mm (this is the requirement for self-unloading, and the pumping is based on the actual slump required on site)

Aggregate specifications: the maximum particle size of concrete coarse aggregate is 40mm, and the dosage is not less than 800-900kg; the fineness modulus of fine aggregate is 2.

Water quality requirements: use clean tap water, water temperature < 28 ℃

Time between arrivals of concrete trucks: no more than 40 minutes

Initial setting time: no more than 6 hours (the initial setting time of concrete should be counted from the time of arrival)

Final setting time: ≤18 hours

Admixtures: necessary superplasticizers that can improve the performance of concrete, necessary and supporting additives
.

The air content of concrete is 1%-2% best, it should not be about 3%;

The final dry shrinkage strain is less than 5.
2/10,000;

02 Floor anti-cracking solution

Admixtures: necessary superplasticizers that can improve the performance of concrete, etc.
, if necessary, add Sika ViscoCrete 3301C

8.
3kg/m3

Add steel fiber: steel fiber for floor, length: 50mm, diameter: 0.
75mm, aspect ratio L/D: 66.
6, minimum tensile strength 1300 MPA, steel fiber with hooks at both ends, directional magnetization discharge in the box ; Dosage: not less than 20 kg per cubic meter of concrete;

The air content of concrete is 1%-2% best, it should not be about 3%;

The final dry shrinkage strain is less than 5.
2/10,000;

Protective agent: spray sika931 to prevent shrinkage and cracking
.

Maintenance: The maintenance is done by watering and covering the plastic film or geotextile.
The curing time is not less than 14 days, and the plastic film is not less than 0.
05mm thick; in order to ensure the quality of the floor, heavy objects should not be placed during the maintenance
.

Base surface treatment plan:

A.
Base milling and coating of interface agent

Use a special milling machine to mill and roughen the surface of the ground base (milling 3mm) until the solid concrete base is exposed; then use a high-pressure water gun to clean the base to remove the concrete and other debris that are moving on the concrete base; Before brushing the interface agent, the concrete base layer should be fully wetted with water (no clear water) to ensure that the base layer fully absorbs water; Keeping the interface agent moist, start pouring the concrete
.

 If the concrete thickness is greater than 10cm, PE film can be laid, and the separated leveling is adopted, and the concrete forms a separate moving plate
.

B.
Set up construction sub-silo joints

The special standard parts for the floor are used as the sub-silo joints in the concrete construction
.

When setting, the top elevation should be accurately calibrated to make it consistent with the floor elevation;

The installation height of the floor joint system is at least 20mm smaller than the thickness of the concrete slab, so as to avoid the uneven base surface affecting the installation level
.

l The aspect ratio of the floor sub-warehouse should be limited to within 1:1.
5
.
It is installed at the same level as the floor, and one side is fixed on the outside of the floor poured on the same day; before pouring the adjacent floor, remove the fixation; during the finishing operation, the construction joints should be carefully closed with a hand trowel, and mud should be avoided.
Contaminate the gap between the floor joints; it is forbidden to use a trowel to construct across the joints, so as not to damage the floor joints
.

C.
Set the column edge isolation joint system on the column edge

It is made of integral hot-dip galvanized steel sheet, and the prefabricated circular permanent column edge isolation joint system is spliced ​​on site
.
Function: Since the settlement velocity of the foundation under the column is different from the settlement velocity of the floor foundation, cracks are most likely to occur at the column edge.

Setting construction joints can completely prevent the extension and spread of column edge cracks to the floor
.

D.
Set the isolation seam

Practice: In the pouring area, set isolation boards at all walls and column bases, and the board and the floor are at the same height
.
Plates are made of compressible material
.
Ensure the continuity of the slab and secure it to avoid loosening during concrete pouring
.

Function: Because the floor is a large area of ​​concrete, it is greatly affected by thermal expansion and contraction.
After isolation, it will prevent the floor from squeezing the columns and walls
.

03 Concrete leveling scheme

First, manually pave the concrete roughly according to the floor elevation;

Use vibrating rods to vibrate the concrete at the same time as paving, and add vibrating vibrators at the corners;

Immediately use a laser leveler to level the parts that are paved and vibrated to ensure the flatness of the floor;

When using the laser leveling machine, pay attention to the placement of the laser transmitter, so as to avoid a blind spot where the laser cannot be received
.

After the leveling machine is leveled, a manual leveling scraper is used for secondary leveling to remove the floating objects on the concrete surface and improve the surface flatness again;

The local corners are leveled by a special person with a trowel
.

04 Emery wear-resistant construction scheme

A.
The aggregate materials are domestic or international first-line brands:

Corundum corrosion-resistant aggregate, dosage: 5kg/m2

The color is selected according to the construction unit (gray, primary color, medium gray, dark gray, blue gray, green)

B.
Construction Method

1.
Use a spreader to spread wear-resistant materials evenly

After leveling, immediately spread the material evenly on the concrete according to the dosage of 5 kg/m2
.

2.
Manual spreading

Spreading time: After the initial setting of the concrete, there are shallow footprints on the concrete surface; according to the prescribed amount of wear-resistant materials, spread evenly in two batches (3kg/m2 for the first time and 2kg/m2 for the second time), and the order is as follows:

After the wear-resistant material absorbs a certain amount of water in the concrete (the surface of the wear-resistant material is in a wet state), the grinding machine is used for grinding and slurry extraction; the second spreading operation is performed to spread the remaining amount
.
After the second layer of wear-resistant material absorbs a certain amount of water, it is ground again with a grinder;

3.
After hardening to a certain extent, use a grinder to polish the surface; adjust the operation speed and angle of the grinder according to the hardening of the concrete; each step of grinding and polishing is guaranteed to be at least twice; Depends on the surface gloss requirements
.
The polishing of the perimeter and corner areas of the column is carefully carried out by hand;

05 Maintenance plan

The curing method is to cover the plastic film or geotextile with water.
The curing time is not less than 14 days, and the thickness of the plastic film is not less than 0.
05mm; in order to ensure the quality of the floor, heavy objects should not be placed during the maintenance period
.

06 Cutting and filling scheme

Cutting time: Immediately after one or two days after polishing and finishing;

Doorway cutting: Avoid cutting seams in the middle of the entrance and exit;

Caulking: Squeeze into foam strips and fill with polyurethane caulk

07 Curing construction

A.
Construction materials
.
The curing agent matched with the aggregate, the unit dosage is not less than 0.
15kg/m2

B.
Construction Method

After concrete paving and dry-spraying aggregates, spray the matching light-collecting synergistic curing agent
.

After spraying for 7d, you can start polishing, no other curing agent is needed, which saves a lot of time
.

08 Finished product protection

After the completion of the floor construction, a cordon will be set up on the site to prohibit other types of workers from entering the newly completed floor area
.

On-site management personnel patrol to prevent other operations on the new floor
.