What are the prevention measures for concrete cracks
WODETEC is a professional manufacturer of concrete pumps and wet spraying machines. Good product design comes from practice. According to many years of practical experience, it is believed that the precise calculation of heating peaks, internal and external temperature differences and cooling rates before construction are extremely important to prevent cracks due to temperature. important.
We can start prevention from the mold entry temperature. There are many measures to reduce the temperature of concrete entering the mold, such as adding ice to the water tank, or taking sun protection measures, or spraying some cold water on the tank in summer. At the same time, the pipelines of equipment such as concrete pumps also need such sun protection. Second, reducing the heat of hydration of concrete can start from the choice. Choosing medium and low heat cement such as slag silicate, or mixing a certain proportion of fly ash, superplasticizer, retarder, can play a role in preventing cracks.
We can start prevention from the mold entry temperature. There are many measures to reduce the temperature of concrete entering the mold, such as adding ice to the water tank, or taking sun protection measures, or spraying some cold water on the tank in summer. At the same time, the pipelines of equipment such as concrete pumps also need such sun protection. Second, reducing the heat of hydration of concrete can start from the choice. Choosing medium and low heat cement such as slag silicate, or mixing a certain proportion of fly ash, superplasticizer, retarder, can play a role in preventing cracks.
In order to reduce the thermal diffusion of the concrete surface, reduce the internal and external temperature and delay the heat dissipation time, control the cooling rate and avoid the through cracks, the curing is generally not less than 15 days. The curing time is generally calculated based on the adiabatic temperature rise, and the maximum temperature is determined according to the temperature control measures to determine the covering thickness and curing time of the plastic film.
Maintenance and maintenance of wet spray machine:
1. When spraying 300m3 of concrete or working for 1 month, the lubricating oil in the cam cavity should be replaced; the lubricating oil in the gearbox should be replaced every 6 months of work.
2. Frequently check whether the leak hole on the rotor body is unblocked.
3. Check whether the piston is worn or not. If it is severely worn, replace it immediately. The way to check whether the piston is worn is to observe whether the slurry leakage hole on the rotor body is serious.
4. Check whether the lubricating oil in the cam cavity and the reduction box is enough, and it needs to be supplemented if it is not enough.
5. Check whether the bonding plate is severely worn. If it is severe, it needs to be replaced. Otherwise, it will cause the phenomenon of air return and difficult feeding.
6. Check whether the screws on the machine are loose and whether the electrical switch connectors are loose.
7. Frequently clean the accelerator filter.
8. Check the wear of the rollers and piston rod keys in the cam cavity every 1 month of work, and replace them in time when they need to be replaced.
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