How to keep concrete insulated for transportation, and how to keep concrete insulated in winter?

1) The cement should be transported into the greenhouse for storage before use.

2) In the severe cold season, the concrete should be properly covered and insulated for the transportation equipment, and the transportation distance and the number of loading and unloading should be shortened as much as possible. A thermometer is used at any time for the concrete mold temperature.

Temperature measurement. 3) After the concrete is poured, the temperature of the mold should be measured at any time, and the moisturizing and thermal insulation cover should be done in time, first covered with a layer of plastic cloth to moisturize, and then covered with a layer of cotton felt or straw bags to keep warm.

4) The critical strength of concrete freezing is made of Portland or ordinary Portland cement.

The prepared concrete is 30% of the design strength, and the concrete prepared with slag cement is 40% of the design strength, and shall not be less than 5MPa, for which the concrete should be cured at the normal temperature for at least 5 days and nights before being frozen.

I don't know what you mean.

In winter, the temperature of the concrete is generally mixed and added with concrete antifreeze, hot water to heat the concrete aggregate, and hot water to mix.

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.

The weather is cold and the temperature is low in winter, in order to ensure the concrete batching plant.

Normal operation, need to take certain insulation measures, usually need to control the temperature of the equipment and add admixtures two ways, the Great Wall construction machinery mixing plant manufacturers will give you a detailed description of these two ways.

1. Control the temperature of water. In order to prevent the water temperature from being too low, you can use warm water to increase the problem of concrete, and in order not to damage the performance of concrete, it is necessary to control the water temperature to 60-80 degrees Celsius.

2. Install an anti-freeze airtight building for the main engine of the mixing plant. Great progress has been made in providing interfaces for thermal insulation facilities in anti-freeze closed buildings, and the normal operation of equipment can still be guaranteed in regions with severe winters such as Russia.

Add admixtures to concrete to prevent retarding phenomenon, concrete frost heave: Generally, the concrete batching plant has a certain distance from the concrete site, so it is necessary to increase antifreeze, antifreeze can effectively prevent concrete from being frost damaged, and the antifreeze agent is selected to contain nitrite.

Dosage of active ingredients such as triethanolamine.

Concrete curing needs to be cured in a constant temperature and humidity environment. Generally, the maintenance and constant temperature of the concrete test block can be adjusted by installing the bridge lifting air conditioner and thermometer, and the constant humidity can be adjusted by installing the spray pipe.

How should the construction unit Xiaozhen maintain it after pouring concrete? First of all, if the weather is hot, then you need to cover weeds, rags, etc., and then pour water on top to keep it moist. If it's a rainy day, then there is no need to cover these after the concrete has finally set. Reminder that after the concrete pouring is completed, it is necessary to wipe the surface many times before the initial setting to prevent cracks, especially pay attention to the high temperature weather, and carry out sprinkling maintenance after the initial setting.

If the temperature is too high, be sure to cover wet weeds, rags, etc. to shade the sun and prevent sun exposure.

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.