Betongtorkning on Windows Pc

The app calculates the minimum drying time from the surrounding building is tight. The calculations are suitable for standard slabs of concrete with Portland cement (CEM I) as binder.

The result (at the top of the app) gives an assessment of the minimum number of days it takes for the concrete structure to dry out to the desired relative humidity of the hardening environment is being set.


HELP
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The desired relative humidity (RH) - The RF you wish concrete structure should reach down to be set between 85 and 90%. We recommend 85%.

The water-cement ratio (VCT) - the ratio between water and cement in concrete. Generally a dry concrete having a low cement ratio (low water content) faster than a concrete with high cement ratio (high water content). The app allows a VCT between 0.4 and 0.7 indicated.

Construction Thickness - The thickness of the structure between 10 and 25 cm can be mentioned. Dehydration rate of concrete with different VCT affected differently at different thicknesses.

Single or double-sided dehydration? - Drying of the floor is single or double sided. Filigranbjälklag can be regarded as double-sided dehydrated if the total thickness of the plate has been included in the design thickness. Is only pågjutningens thickness, the drying is calculated as one-sided drying out from the soffit. Slab on the ground is regarded as one-sided drying.

Ambient temperature and humidity - The ambient air temperature and relative humidity (RH) is important for how fast the concrete dries out. By subjecting the concrete to dry (low RF) and the hot air drying time can be reduced considerably. What temperature and relative humidity of the surrounding air during the drying stage is something you can influence and control yourself.

Harding Environment - To achieve a dry concrete, it is important that the drying start as soon as possible after molding, when the concrete is most open. After the hand thickens, prolonging drying time of design. In order to achieve a concrete intended relative humidity, it is important that the drying start as soon as possible after molding, when the concrete easier emit moisture to the surroundings. Gradually thickens more concrete, which prolongs the drying time. For drying of concrete to 90% RH, the following curing conditions.

1) Dry weather - Hardening factor in dry weather indicated by the icon of the "sun" is highlighted.
2) 4 weeks moisture saturated air or dense coverage - hardening factor at four weeks of the moisture saturated air or alternatively by dense coverage indicated by the icon for "carpet" is highlighted.
3) 4 weeks of rain - hardening factor at four weeks of rain indicated by the icon of "rain cloud" is highlighted.

Drying Home begins when the design is not applied more moisture, ie when the surrounding building or structure is dense.


BACKGROUND AND PURPOSE
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The aim of the project has been to using new technology to improve entrepreneurs' access to knowledge about building moisture problem by drying of concrete in residential buildings.

The calculations are based on the results of a previous project including assumed research conducted by Goran Hedenblad with several at Damp Group at LTH. In SBUF project developed a methodology for assessing the drying times of concrete which was compiled in a crib. The crib is based on the five tables for different metrics, which are then multiplied together to determine the number of days to the estimated minimum drying time under certain conditions.

In this app, further steps have been taken with automatic calculations for which parameters can be set at a higher level of detail by interpolating the previous readings.


If the app
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SBUF (Swedish Construction Industry Development) have accounted for the initiative designed and financing of Concrete Drying app. The app was produced by Profundis. The background to the data values ​​in the calculations have been based on Concrete Curing - Crossword published in SBUF Informs 95:14.