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Measurement of Air Content in Concrete

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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement...

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Methodological Basis for Reliable Evaluation of Air Void Structure Parameters Using the 2D Method.

Jerzy Wawrzeńczyk¹, Henryk Kowalczyk¹

¹Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.

Materials (Basel, Switzerland)

|May 14, 2025

Summary

This summary is machine-generated.

Optimizing pavement concrete frost resistance requires precise air void analysis. This study defines optimal measurement parameters for 2D surface pore analysis, ensuring accurate assessment of air void structure for improved durability.

Keywords:

2D surface method Monte Carlo method air void structure concrete spacing factor

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Area of Science:

Civil Engineering
Materials Science
Concrete Technology

Background:

Frost resistance in pavement concrete is critical and linked to air void structure.
Traditional methods assess air voids via chord lengths (1D), but 2D surface pore analysis is gaining traction.
Accurate identification of small pores from modern admixtures is crucial for assessing frost resistance.

Purpose of the Study:

To define optimal measurement frame parameters for 2D surface analysis of concrete air void structure.
To compare 2D surface analysis with traditional 1D chord length measurements.
To establish reliable parameters for assessing concrete frost resistance.

Main Methods:

Comparative analysis of 1D and 2D air void structure parameters.
Creation of geometrical models of air voids using the Monte Carlo method.
Utilizing real concrete data for model validation.

Main Results:

Good agreement was observed between 2D and 1D air void structure analysis results.
Recommended parameters for satisfactory 2D analysis: three 50x50 mm frames or four 40x40 mm frames.
A minimum resolution of 3 µm/px is required for effective pore identification.

Conclusions:

The study provides definitive measurement parameters for reliable 2D air void analysis in concrete.
The findings support the use of 2D surface analysis as a viable method for assessing concrete frost resistance.
Optimized parameters ensure accurate characterization of air void structure for enhanced pavement durability.