Winter construction and insulation system 100

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.

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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 construction technical plan (measures) formulated should have the following: construction deployment (schedule), construction procedures, construction, machinery and materials deployment plan, construction personnel technical 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.

In winter, if you add antifreeze and civil construction, you have to cooperate with the thermal insulation quilt.

In the case of winter construction in the north, there is basically that kind of thermal insulation and foam, and then the employees must wear the kind of leather thicker clothes.

The addition of salt here acts as an early strength agent.

Early strength agent is an admixture that accelerates the early strength development of concrete, and can be used to ignite the hardening process of absolute speed concrete under normal temperature, low temperature or negative temperature (not less than -5 degrees). The commonly used early strength agent and acacia should have sodium chloride, calcium chloride, sodium sulfate, sodium nitrite, potassium carbonate, etc.

At the same time, most of the early strength agents have the ability to reduce the freezing point of water, so that the concrete continues to hydrate under negative temperature, increase the strength, and play a role in preventing the freezing of Duan You.

Chloride salt admixtures: mainly sodium chloride, calcium chloride, which are cheap and easy to buy, but have a corrosive effect on steel bars, and the parameters in general reinforced concrete shall not exceed 1% of the weight of cement according to the calculation of the anhydrous state; In non-reinforced concrete, the concrete is mixed with hot materials, and the chloride salt shall not be greater than 3% of the weight of the mixed cement; When cold mixing is used, the chloride salt parameter shall not be greater than 15% of the weight of the mixing water

The concrete with chloride salt must be vibrated and compacted, and steam curing should not be used.