Concrete Air Void Analysis
1. Overview
The Concrete Air Void Analysis System is a combination of software that analyzes the air void content of hardened concrete and hardware that automatically scans the specimen surface.
It performs analysis of concrete air voids according to ASTM C 457 standards using either the Linear Traverse (Method A) or the Modified Point Count (Method B).
After placing the cut, polished, and stained concrete sample on the X-Y-Z motorized stage, the designated sampling area is automatically scanned by the control program.
The scanned images are saved in a specified folder, converted into analysis images, and used for evaluation.
The total time from loading the specimen onto the stage to completing the analysis is within 3 minutes.
The results provided according to ASTM C 457 include Paste % (p), Air % (A), Chord Length (l), Paste-Air Ratio (p/A), Specific Surface (α), Void Frequency (n), and Spacing Factor (L).
2. Standard
Supports the Linear Traverse Method and Modified Point Count Method according to ASTM C457 standards.
3. Program Startup
Select Concrete Air Void Analysis from the measurement menu.
4. CAVA Module Dialog Box
5. Linear Traverse Method
The linear traverse method displays a specified number of horizontal lines on the image and identifies the intersections that pass through each section of the objects.
It measures the chord lengths of air voids and paste.
Based on the lengths that pass through each section, the total traverse line length (Tt), the total length passing through air voids (Ta), and the total length passing through paste (Tp) are obtained.
The number of air voids intersected by each traverse line is counted to calculate the total number of air void intersections (N).
From these basic data, the following values are derived.
6. Modified Point Count Method
The modified point count method arranges points at specified intervals on the image and counts the points overlaid on each section of the objects.
It measures the number of points overlaid on air voids and paste.
Based on the points overlaid on each object, the total number of points (St), the total number of points overlaid on air voids (Sa), and the total number of points overlaid on paste (Sp) are obtained.
The number of air voids (N) is also calculated.
From these basic data, the following values are derived.
7. Multi-phase
When the Multi Phase button is pressed, a color conversion filter is applied to the original image, generating a grayscale image in which air voids are displayed in white (255), paste in gray (128), and aggregates in black (0).
The Color Space function, based on the user’s intuitive adjustment, classifies air voids and paste into different luminance levels, producing a 3-phase monochrome image.
8. Measure
When the Measure button is pressed, the measurement is performed immediately.
Compared to the Linear Traverse method, the Modified Point Count method requires more time.
9. Report
When the Report button is pressed, the measurement data and the 3-phase monochrome image are exported to an Excel sheet.
10. ProScan Mosaic2
When the Scan >>> button is pressed, the screen switches to ProScan Mosaic2.
