Specific construction measures for concrete insulation in winter construction

1. The concrete ratio should be mixed with antifreeze in proportion in accordance with the relevant national regulations, and its brand must be approved by the construction unit and the supervision unit.

2. Arrange professional temperature testers to measure the temperature in a timely manner when each car of concrete is unloaded in accordance with the requirements of national regulations, and make records. The record should indicate the license plate number, and the arrival time, pouring time, concrete temperature, and outdoor temperature, concrete mold temperature should be controlled not less than 15 C, when the outdoor temperature is lower than -8 C, concrete pouring shall not be carried out.

3 Concrete transportation; In the process of concrete transportation, concrete manufacturers are required to carry out concrete transportation tankers.

Effective heat preservation. In order to reduce heat loss, manufacturers are required to transport concrete to the construction site in time after the concrete is out of the machine. The driver must be familiar with the transportation route and choose the best transportation route.

4. Prepare the insulation quilt and plastic film required for thermal insulation before pouring concrete. Before pouring, the debris and ice and snow on the formwork should be removed. Prepare construction machinery, tools, etc.

5. When the concrete is constructed in winter, in order to ensure the construction quality, the concrete should be insulated in time after the mixed age soil is poured.

1. Steam health regimen; 2. Greenhouse method; 3. Covering heat storage method; 4. Admixture method (antifreeze); 5. You can also heat the mixing water (no more than 80°), heat the aggregate, etc.

Add antifreeze, and use some more earthy methods to work well, such as sealing the whole floor slab and heating...

The theory is to use a series of heating methods, but sometimes it is not very realistic, we are in the construction, first of all, and the concrete company agreed, the requirements of the same level of strength of the concrete requirements are now the early strength has been improved, in the construction, in the bricklayer team immediately after the second light with the thick transparent plastic paper covered, the top is pressed with a clinker bag, the clinker bag is generally spread, and the position in contact with the edge is compacted with something. It works pretty well.

Material heating water and aggregate should be heated when stirring to add antifreeze early strength agent, if the mixing plant will be used to deal with the pouring of the film and quilt insulation in time after pouring can also be closed with color strip cloth and then fire The mold removal needs to reach the specified strength and the concrete surface temperature drops to below 5 degrees Celsius, if the local is too cold, when the temperature difference between the outdoor temperature and the concrete temperature is above 20 degrees Celsius, the mold should still be covered with insulation after the removal of the mold, so that it can be cooled slowly, which is of course the specification In practice, it is necessary to do a good job of thermal insulation measures in the early stage and before the removal of the mold.

The specific measures are as follows:

1. The formwork and insulation materials can only be removed after the concrete has cooled to 5.

2. When the temperature difference between the concrete and the outside is greater than 15, the concrete surface after demoulding should take thermal insulation measures to cool it slowly.

3. The initial curing temperature of concrete should not be lower than the specified temperature of antifreeze, otherwise thermal insulation measures should be taken. When the temperature is lowered below the specified temperature of the antifreeze, its strength cannot be less than.

4. Strengthen thermal insulation and maintenance, do a good job in the temperature measurement record of concrete curing, compare the internal and external temperature difference for each measurement, and take measures to strengthen thermal insulation in time when abnormalities are found.

5. For concrete mixed with antifreeze, it should be measured every 2 hours before the strength reaches 5n mm2, and every 6 hours thereafter.

6. Before pouring concrete, the snow, ice and insulation materials on the formwork and steel bars must be cleaned up.

7. In winter, at least two groups of specimens cured under the same conditions as the structure should be added for the sampling of concrete specimens, which is convenient for understanding the growth of concrete strength and conducive to the construction of on-site structures.

8. After the concrete is poured, do a good job of thermal insulation as required and make a temperature measurement record during the curing period according to the pre-buried temperature measuring pipe. During the curing period of concrete, it is necessary to prevent wind and water loss, and the thickness of the insulation layer at the corners should be increased to 2-3 times that of the outside of the face.

9. The concrete temperature measurement is arranged by a special person, and the temperature measurement table is reported to the relevant departments for archiving.

10. Commonly used admixtures are collected, configured and added according to the requirements.

11. The temperature and covering insulation materials in the process of concrete mixing, transportation, pouring, molding and curing should be thermally calculated.

12. The insulation and maintenance of the first pouring frame and platform adopts a layer of plastic cloth and 1 3 layers of straw curtain, and is tied firmly with 8 lead wires, and the number of straw curtain layers is determined according to thermal calculations to ensure that the critical strength is reached before freezing.

The methods of concrete insulation in winter are mainly heat storage method and greenhouse method.

The applicable environment of the heat storage method is more than minus 10 degrees, while the greenhouse rule is less than 10 degrees of negative local car

1. The heat storage method is to take the material with poor thermal conductivity in the outer layer of the concrete building to keep warm, the heat source is the heat of the concrete composition material and the heat of cement hydration, the template is the insulation template, and the insulation material is covered in the outer layer immediately after pouring, which is actually the surface insulation method, which can avoid cracks in the outer layer and ensure that the temperature difference inside it is within the allowable range.

2. The greenhouse method is to build a greenhouse on top of concrete, and use a steam pipe or a heating fan to provide heat inside, so that the temperature in the shed is maintained at 0 to 5 degrees.

The insulation layer is usually made of straw curtains, straw mats or canvas, and the concrete blanking port on the roof of the shed will have a movable material mouth cover, and usually the surrounding area will be wrapped with sack pieces and straw mats to keep warm, etc., the whole shed cover is the whole, its advantage is that it is convenient to dismantle, and different measures can be taken according to different temperatures, according to the grade of concrete, thickness, seasonal changes, and maintenance conditions to achieve construction standards.

Lamination, straw curtains, quilts, small sun, fan heaters, and steam for boiling hot water in a small space.

It is possible to keep warm with straw curtains, felt or thermal insulation.

In the construction technical plan (measures) formulated, the following should be included: construction deployment Nawang (schedule), construction procedures, construction, machinery and materials deployment plan, construction personnel starvation technology training (temperature measurement personnel, admixture personnel) and labor plan, insulation materials and admixture material plan, operation points, quality control points, testing items and other aspects.

1) Production preparation: Arrange the construction tasks and on-site preparations according to the established schedule. Such as the insulation and anti-freezing of the on-site water supply pipeline, the insulation of the mixer shed, the leveling of the site and the setting of temporary roads, and the closure and insulation of doors and windows of the decoration project.

2) Resource preparation: Organize the preparation of admixture materials, insulation materials, construction instruments (temperature measuring agents), and labor protection supplies for employees according to the plan formulated.

Concrete The following construction insulation measures:

1. Cover and maintain with insulation materials such as quilts, cotton felts, straw mats, and plastic films.

2. Use antifreeze.