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Concrete Drying

June 15, 2011

 

Presence of high moisture levels on the concrete floor hampers the epoxy flooring procedure thereby delaying the project completion. POP drying also takes unusually longer time if the concrete curing or drying is not done properly. Life & quality of coating gets hampered if it is done in the presence of high moisture levels, instead of adhering to the substrate i.e. concrete, the coating adheres to water, lowering its life.

Concrete gains its strength due to presence of water molecules inside. However only 50% of this water is hydrated and rest remains as free moisture. Further as concrete takes around 28 days to cure, it is kept under 100% RH or under wet condition till hydration is complete. This process increases the free moisture to around 7-8% which is not acceptable for the application of coating. Coating manufacturers do not guarantee their products if the moisture content is at that level.

General Recommendation

Moisture level in the concrete should be maintained at 3-5%.

TDS Solution

Drying of concrete i.e. reduction of moisture can be done with the help of dehumidifiers. Dehumidification is the most effective and quickest method of moisture removal. Dehumidification involves lowering the dew point of the air surrounding the concrete so as the water starts to migrate from concrete to the dry surrounding air. Dehumidification helps to achieve and maintain the Level of Moisture to prevent coating failure while concrete coating.

For inside coating of concrete floor/wall, dehumidified air can be fed through duct from the machine. In case of outside concrete painting in open atmosphere, a vapour barrier surrounding the job is created and dehumidified air is passed inside the vapour barrier through duct.

The desiccant based dehumidifier removes moisture from the air by chemical attraction rather than condensation. Humid air is directed across a desiccant material that acts as a drying agent. The moisture is collected in the desiccant. The moist desiccant is dried using second hot air stream that heats the desiccant and releases the moisture. Then the desiccant is reused to dry more air. In a continuous process the air is dried by the desiccant at the same time the moist desiccant is dried for reuse so that dry air is available at all times continuously.

To provide the above parameters TDS provides a complete customized package solution of dehumidifiers, condensing units, blowers & ducts backed with technical manpower to maintain the required moisture (3%-5%) and temperature level.

TDS dehumidification services can also be used for ceiling drying,wall drying,surface drying and POP drying. 

 
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