concrete nomograph (surface moisture evaporation rate

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Concrete Nomograph (Surface Moisture Evaporation Rate ...

02/03/2017  I've got a technical question related to a nomograph that can calculate the evaporation rate of the surface moisture on a concrete slab. I have attached a picture of the nomograph for a better visual understanding (can also be found on Google). Basically,there are three graphs representing air temperature, relative humidity, concrete temperature and wind speed. By providing the results of

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concrete pressure performance nomograph

Concrete Nomograph (Surface Moisture Evaporation Rate ... Basically,there are three graphs representing air temperature, relative humidity, concrete temperature and wind speed. By providing the results of the four factors, the nomograph gives the rate of water evaporation.

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Evaporation of water from concrete surfaces

In the absence of such a model, available standards and specifications such as ACI 305.1 (ACI 2006 (ACI 2006), the evaporation rate under atmospheric pressure is estimated using a nomograph given ...

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Concrete Technology in Focus - BASF Insights

on the Rate of Evaporation of Surface Moisture ... it is recommended that precautions against plastic shrinkage cracking should be taken if the evaporation rate from the exposed concrete surface is expected to approach 0.2 Ib/ft2/h (1.0 kg/ m2/h). The evaporation rate for a prevailing ambient condition can be estimated by using the nomograph shown in Fig. 1. Precautionary measures to control ...

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AVR, Inc. - Evaporation Rate Calculator

The calculator below may be used to approximate the Evaporation Rate at the surface of a concrete placement. Hot Weather Recommendations may be found below the calculator. This calculator relies on accurate data provided by the user and does not factor in other variables that can affect the speed at which a particular concrete mix will cure. As such, it should be used as a general guideline ...

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Title no. 95-M34 Plastic Shrinkage Cracking and ...

estimating the rate of evaporation of surface moisture from concrete. The paper offers an alternative nomograph and various formulas to predict an evaporation rate of surface water (primarily bleed water) from freshly placed concrete surfaces. Other factors related to evaporation and plastic shrinkage cracking are also addressed.

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(PDF) Plastic Shrinkage Cracking and Evaporation Formulas

The paper offers an alternative nomograph and various formulas to predict an evaporation rate of surface water (primarily bleed water) from freshly placed concrete surfaces. Other factors related ...

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Evaporation Rate (Water) Calculator - Calculator Academy

03/08/2021  Evaporation Rate Formula. The following formula is used to calculate the evaporation rate of water. gh = (25+19*v)* (A)* (Xs-X) Where gh is the evaporation rate (kg/h) v is the velocity of air above the surface (m/s) A is the water surface area (m^2) Xs is the maximum humidity ratio of saturated air (at the same temperature as the water surface ...

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Evaporation Rate Calculator - ACPA

Time Concrete Temp (o F)Air Temp (o F)Relative Humidity (%) Wind Velocity (mph) Evaporation Rate (lb/ft 2 /h)

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Concrete Technology in Focus - Master Builders Solutions

rate of evaporation In ACI 305R [2], it is recommended that precautions against plastic shrinkage cracking should be taken if the evaporation rate from the exposed concrete surface is expected to approach 0.2 Ib/ft2/h (1.0 kg/m2/h). The evaporation rate for a prevailing ambient condition can be estimated by using the nomograph shown in Fig. 1.

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concrete pressure performance nomograph

Concrete Nomograph (Surface Moisture Evaporation Rate ... Basically,there are three graphs representing air temperature, relative humidity, concrete temperature and wind speed. By providing the results of the four factors, the nomograph gives the rate of water evaporation.

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Concrete Construction ConcreteConstruction

nomograph gives evaporation rates from a surface on which free water is present. Brewer’s data also indicate that meaningful estimates from this nomograph are unlikely. His speci-mens were dried at 73°F and 50% relative humidity, with no wind. Using the nomograph to predict the evaporation rate under these condi-tions yields a rate of 0.02 lbs/sf/hr, which corresponds to a vapor-emis-sion ...

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Concrete Technology in Focus - BASF Insights

on the Rate of Evaporation of Surface Moisture ... it is recommended that precautions against plastic shrinkage cracking should be taken if the evaporation rate from the exposed concrete surface is expected to approach 0.2 Ib/ft2/h (1.0 kg/ m2/h). The evaporation rate for a prevailing ambient condition can be estimated by using the nomograph shown in Fig. 1. Precautionary measures to control ...

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Surface Crazing Concrete Construction Magazine

23/07/2008  A: You can assess the risk of crazing by using the evaporation rate nomograph included in ACI 305 Hot Weather Concreting. The nomogragh is used with ambient conditions and concrete temperature to estimate the evaporation rate from concrete. As stated in ACI 305, an evaporation rate exceeding 0.2 lb/ft2/24 hr risks plastic shrinkage cracking as surface moisture evaporates faster than

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Estimating Evaporation Rates to Prevent Plastic Shrinkage ...

In this nomograph, the rate of evaporation is estimated by following the four steps listed on the left side of the chart. The arrows demon- strate an example for a day where the ambient air temperature is 80 °F (27 °C), the relative humidity is 50%, the concrete temperature is 87 °F (31 °C), and the wind velocity is 12 mph (19 km/h). The resulting rate of evaporation is about 0.25 lb/ft2/h ...

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Concrete Technology in Focus - Master Builders Solutions

rate of evaporation In ACI 305R [2], it is recommended that precautions against plastic shrinkage cracking should be taken if the evaporation rate from the exposed concrete surface is expected to approach 0.2 Ib/ft2/h (1.0 kg/m2/h). The evaporation rate for a prevailing ambient condition can be estimated by using the nomograph shown in Fig. 1.

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Evaporation Rate Calculator - ACPA

Time Concrete Temp (o F)Air Temp (o F)Relative Humidity (%) Wind Velocity (mph) Evaporation Rate (lb/ft 2 /h)

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Surface Cracking Caused by Rapid Moisture Loss For ...

21/06/2019  By using the nomograph, the rate of evaporation of surface moisture—or more specifically the severity of the evaporative exposure and risk of plastic shrinkage cracking—can be estimated from ...

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ESTIMATING EVAPORATION FROM WATER SURFACES

• Water surface temperatures reached a ... – equivalent to 2 1to 4 mm d‐ evaporation • Example rates calculated from lake studies – Pretty Lake in Indiana – Williams Lake in Minnesota 12‐Mar‐2010 ET Workshop 29. Reported Energy Storage Rates - Pretty Lake (63-65) Williams Lake (82-86) 10.0 15.0 d-1 0.0 5.0 t, MJ m-2-10.0-5.0 0 30 60 90 120 150 180 210 240 270 300 330 360 Q ...

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Evaporation from Water Surface - Engineering ToolBox

To reduce the energy consumption and to avoid moisture damages in building constructions it is common to use heat recycling devices with heat pumps moving latent heat from the air to the water in the swimming pool. Water Surface Evaporation Calculator. A - water surface area (m 2) x s - maximum saturation humidity ratio in air (kg/kg) (kg H 2 O in kg Dry Air) x - humidity ratio in air (kg/kg ...

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concrete pressure performance nomograph

Concrete Nomograph (Surface Moisture Evaporation Rate ... Basically,there are three graphs representing air temperature, relative humidity, concrete temperature and wind speed. By providing the results of the four factors, the nomograph gives the rate of water evaporation.

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Concrete Technology in Focus - BASF Insights

on the Rate of Evaporation of Surface Moisture ... it is recommended that precautions against plastic shrinkage cracking should be taken if the evaporation rate from the exposed concrete surface is expected to approach 0.2 Ib/ft2/h (1.0 kg/ m2/h). The evaporation rate for a prevailing ambient condition can be estimated by using the nomograph shown in Fig. 1. Precautionary measures to control ...

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525 Bridge Decks

Consideration should be given to delaying the pour if the rate of concrete surface moisture evaporation exceeds 0.2 lb/sq ft per hour as shown in figure 525-1 below. The evaporation nomograph in figure 525-1 is mobilized into the contract by standard spec 501.3.8.2.2. May 2021. Construction and Materials Manual FIGURE 525-1 Rate of Evaporation of Surface Moisture from Concrete 525.1.4

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A review of hot climate concreting, and the appropriate ...

the evaporation rate approaches 1 kg/m²/h, this rate is estimated from the ACI 305 nomograph (Fig. 1). Although this diagram has been criticized [8] and new formulas more precise and adequate to concrete have been proposed [9, 10], because it connects to the evaporation of an open surface of water rather than to a concrete surface, other researcher [11] ensures that the nomograph gives ...

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Evaporation Rate Calculator - ACPA

Time Concrete Temp (o F)Air Temp (o F)Relative Humidity (%) Wind Velocity (mph) Evaporation Rate (lb/ft 2 /h)

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Water evaporation from freshly placed concrete surfaces in ...

However, in the case of specimens cast in the morning time, the maximum rate of evaporation occurred at noon time, 3–5 hours after casting, when the concrete had partly set and had no free moisture available on the surface. The study further shows that the shading of specimens to protect them from solar radiation lowered the rate of evaporation by 50 per cent or more of the respective rate ...

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Evaporation Calculator - ACPA

This evaporation rate calculator uses the evaporation rate equations in Paul Uno’s ACI Materials Journal (July/August 1998) article, Plastic Shrinkage Cracking and Evaporation Formulas, which are based on the popular evaporation rate nomograph from ACI 305R, Weather Concreting. Using this tool, you can quickly calculate the evaporation rate at hourly intervals based on the concrete ...

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ESTIMATING EVAPORATION FROM WATER SURFACES

• Water surface temperatures reached a ... – equivalent to 2 1to 4 mm d‐ evaporation • Example rates calculated from lake studies – Pretty Lake in Indiana – Williams Lake in Minnesota 12‐Mar‐2010 ET Workshop 29. Reported Energy Storage Rates - Pretty Lake (63-65) Williams Lake (82-86) 10.0 15.0 d-1 0.0 5.0 t, MJ m-2-10.0-5.0 0 30 60 90 120 150 180 210 240 270 300 330 360 Q ...

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Technical Report Documentation Page 1. Report No. FHWA ...

Figure 3. 5 ACI Evaporation Nomograph (ACI 1996).....44 Figure 3. 6 Trends of Surface Moisture Emissivity:.....48 Figure 3. 7 Validation of New Evaporation Model at Field: (a) Solar Radiation and Wind Speed Measured by Weather Station; (b) Comparison of Rate of Evaporation among Measurement, New Model, and ACI Nomograph.....49 Figure 3. 8 Lab Tests .....50 - xi- List of Tables Table 3-1 ...

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Evaporation from Water Surface - Engineering ToolBox

To reduce the energy consumption and to avoid moisture damages in building constructions it is common to use heat recycling devices with heat pumps moving latent heat from the air to the water in the swimming pool. Water Surface Evaporation Calculator. A - water surface area (m 2) x s - maximum saturation humidity ratio in air (kg/kg) (kg H 2 O in kg Dry Air) x - humidity ratio in air (kg/kg ...

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