Anhui Concrete Antifreeze Manufacturer-What should be paid attention to and what measures should be taken during winter concrete construction?

Contents of this article

• What should you pay attention to when pouring concrete at low temperature?

• What should you pay attention to when pouring concrete in winter?

• What are the concrete anti-freeze specification requirements?

• What should we pay attention to and take during winter concrete construction?

• What should we pay attention to when pouring concrete in winter?

• What should we pay attention to when pouring mixed concrete in autumn and winter?

• What should you pay attention to when pouring large volumes of concrete in winter?

What should you pay attention to when pouring concrete at low temperature?

In the north, the winter construction season is about to enter. The current temperature is high and low. The temperature affects the setting time and final quality of concrete. So in the upcoming low temperature season, what preparations should concrete companies make? Let’s read the low-temperature construction precautions recommended by industry experts.

1. General provisions

1. When the daily average temperature stabilizes below 5℃ for 5 consecutive days or the minimum temperature stabilizes below -3℃ for 5 consecutive days, construction shall be carried out according to the low temperature season.

2. During construction in low-temperature seasons, special construction organization design and technical measures must be prepared to ensure that the poured concrete meets the design requirements.

3. The early allowable freezing critical strength of concrete should meet the following requirements:

(1) The mass concrete should not be less than 7.0MPa (or the maturity should not be less than 1800℃· h);

(2) Non-mass concrete and reinforced concrete should not be less than 85% of the design strength.

4. In low temperature seasons, especially in severe cold and cold areas, the construction parts should not be scattered. For poured concrete that requires thermal insulation, thermal insulation measures should be taken before entering the low temperature season.

5. Entering the low temperature season, heating, insulation and antifreeze materials (including early strength and antifreeze admixtures) should be prepared before construction, and fire prevention measures should be taken.

2. Concrete enterprises should make the following preparations before construction in low-temperature seasons

1. The storage, heating, and transportation of raw materials, as well as the mixing, transportation, and pouring of concrete silos, should all Select appropriate insulation measures based on thermal calculations based on climatic conditions.

2. The aggregates should be screened and washed before entering the low temperature season. Finished materials should be adequately stocked and stacked high, and measures should be taken to prevent ice, snow and freezing.

3. In low-temperature seasons, the concrete mixing water should be heated first. When the daily average temperature is stable below -5℃, it is advisable to heat the aggregate. The aggregate heating method should use the steam pipe method. Coarse aggregates can be heated directly with steam, but the water-cement ratio of the concrete must not be affected. (When the aggregate does not need to be heated, care should be taken not to freeze or be mixed with ice or snow.)

4. Before mixing concrete, the mixer should be flushed with hot water or steam and the accumulated water should be drained.

5. Before pouring concrete on rock foundation or old concrete, the surface temperature should be checked. If it is negative temperature, it should be heated to positive temperature. The heating depth should not be less than 10cm or heated to the corners of the warehouse surface (maximum Cold place) The surface temperature (greater than 0℃) shall prevail. Concrete can be poured only after passing the inspection.

6. A hot air gun or mechanical method should be used to clean the warehouse surface, not a water gun or Feng Shui gun.

7. When pouring the first layer of foundation concrete on a soft foundation, the base soil must not be frozen.

Concrete companies are prone to quality problems and customer complaints during the low-temperature season. If the organization is not good, it may even cause serious quality accidents. Therefore, every detail needs to be well understood and arranged as a whole. I hope everyone spends the winter smoothly and happily

What are the precautions for concrete pouring in winter?

1. If the temperature will not fall below zero (for more than a week after pouring), just insulate the concrete. If concrete is poured in a negative temperature environment (the lowest temperature is below minus 5°C), the main thing to pay attention to is the early anti-freeze of the concrete.

2. Antifreeze needs to be operated from two aspects:

(1) Use antifreeze: Antifreeze can greatly reduce the freezing point of the mixing water and prevent concrete from being in the plastic state and early stage. Internal moisture freezes and expands, causing frost damage to the concrete. Antifreeze has no obvious harm to the strength performance of concrete, but some antifreeze contains urea, and the concrete will release ammonia smell for a long time, so special attention is required.

(2) Insulation: Use plywood, wooden boards and other formwork with a certain thermal insulation effect as much as possible, and use insulation materials such as quilts, straw curtains or foam insulation boards to cover the exposed concrete surface and wrap the steel formwork to ensure that The strength of concrete develops rapidly. For winter construction, it is best to use early-strength silicate or ordinary Portland cement because the strength develops quickly and the heat of hydration is relatively high.

What are the concrete anti-freeze specification requirements?

① When ordinary concrete is prepared with Portland cement or ordinary Portland cement, it should be 30% of the designed concrete strength standard value;

It is prepared with slag Portland cement When the concrete strength grade is C10 and below, it should be 40% of the designed concrete strength standard value; however, when the concrete strength grade is C10 and below, it shall not be less than 5.0MPa.

② For concrete mixed with antifreeze, it shall not be less than 4.0MPa when the outdoor minimum temperature is not lower than -15℃; when the outdoor minimum temperature is not lower than -30℃, it shall not be less than 5.0MPa.

What should be paid attention to and what measures should be taken during winter concrete construction?

Anti-freeze enhancer should be added when mixing concrete. After pouring and molding, maintenance work needs to be done. It should be covered immediately with film or two straw bags directly on the surface to take insulation measures.

There are also some details that need to be paid attention to during the entire construction process. For example, water cannot be added to the concrete, and the time for removing the formwork will also be extended later.

What should we pay attention to when pouring concrete in winter?

The following matters should be paid attention to when pouring concrete in winter:

1. Maintenance, protection and inspection of the upper and lower water pipes and mechanical equipment of the mixing station, insulation and enclosure of water storage tanks and high-power electric heating Pipe installation preparation.

2. Prepare in advance the raw materials for concrete construction in winter (such as cement, coarse and fine aggregates, admixtures, mixing water, etc.).

3. Winter construction technology briefings and training on fire prevention, antifreeze, and safety knowledge should be organized to improve construction workers’ understanding of winter construction.

4. Send a dedicated person to pay close attention to weather changes every day, and regularly observe the ambient temperature, the temperature of various materials, and the temperature of concrete discharging and entering the mold.

What should we pay attention to during commercial concrete pouring in autumn and winter?

1.

First of all, pay attention to antifreeze treatment. You can add antifreeze inside to avoid hardening.

2.

The water and aggregate used in mixing concrete must be heated to ensure its performance.

3.

During transportation, attention should also be paid to thermal insulation.

4.

At the same time, attention should be paid to the later maintenance work and avoid spraying with water.

What should you pay attention to when pouring large-volume concrete in winter?

1. First of all, pay attention to antifreeze treatment. You can add antifreeze inside to avoid hardening.

2. The water and aggregate used in mixing concrete must be heated to ensure its performance.

3. During transportation, attention should also be paid to thermal insulation.

4. At the same time, attention should be paid to the later maintenance work and avoid spraying with water. </p