Aluminum alloy formwork for winter construction concrete mixing
Release date：2018-04-10 The author： Click on：
Aluminum alloy formwork winter construction concrete mixing:
1. Aggregate used for mixing concrete must be clean and must not contain ice and frozen blocks, as well as materials that are prone to cracking. When mixed with additives containing potassium and sodium ions, active aggregates must not be used. When conditions permit . Gravel sand washing should be done at zero temperature and covered with plastic paper and tarpaulin.
2. When mixing concrete with admixture, if the admixture is powder, the amount of admixture can be directly sprinkled on the cement and cement at the same time. If the admixture is liquid, it should be formulated into a predetermined concentration solution before use. The use of requirements, the preparation of a solution with the required concentration of the preparation solution. Each solution should be placed in a container with a distinct mark, shall not be confused. Each class of additive solution used should be one at a time.
3. When the construction period is around 0°C, early strength agent can be added to the concrete. The dosage should meet the requirements of use and specification, and attention should be paid to the simulation test before adding to verify the relevant technical measures; for limited In order to remove the concrete required for mold removal, the concrete design grade should also be appropriately increased.
4. When adding antifreeze to concrete, it is prohibited to use high-alumina cement.
5. Strictly control the water-cement ratio of concrete, the water contained in the aggregate and the water in the admixture solution should be deducted from the mixed water.
6. When stirring the concrete mixed with admixture, the stirring time should be 1.5 times of the normal temperature stirring time.
7, the temperature of the concrete mixture is not lower than 10 °C, the mold temperature must not be less than 5 °C
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