Analyzing the impact of concrete composition on air void distribution in fresh concrete using ultrafast X-ray computed tomography
Source abstract
Abstract
Understanding the compaction behaviour of fresh concrete is essential, as improper de-airing can lead to unwanted air voids, diminishing mechanical strength and posing durability issues. Despite conventional approaches focusing primarily on concrete workability, this paper investigates the interaction of concrete composition - including cement (paste) content, superplasticizer dosage, aggregate size distribution and compaction duration. As concrete is a highly opaque system with time dependent properties due to both thixotropy as well as chemical cement hydration, an ultrafast X-ray computed tomography (UFXCT) system was used to study air void characteristics in fresh concrete before and after compaction. The study reveals that while the initial concrete workability affects formwork filling, factors such as paste content and compaction duration significantly influence the air void distribution and reduction, particularly for voids trapped in the concrete bulk, thus affecting the strength and durability of the casted concrete element. Incorporating these insights into practical concrete processing procedures could lead to more targeted compaction strategies, ultimately enhancing concrete durability and sustainability.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Radiation Shielding Materials Analysis · Concrete and Cement Materials Research · Electrical and Bioimpedance Tomography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (31)
Show source-provided references
1. B.A. Suprenant, Concrete Vibration: The why and how of consolidating concrete, Department of Civil Engineering & Mechanics, University of South Florida, Tampa, Florida.
2. Mehta · 2006
3. Possibilities of determining the air-pore content in cement composites using computed tomography and other methods10.17222/mit.2014.193 ↗
4. Comparison of the pore size distributions of concretes with different air-entraining admixture dosages using 2D and 3D imaging approaches10.1016/j.matchar.2020.110182 ↗
5. The effect of vibration on the rheological properties of fresh concrete10.1680/macr.1988.40.143.79 ↗
6. Rheology and vibration of fresh conrete: predicting the radius of poker vibrators from wave propagation10.1016/j.cemconres.2011.04.011 ↗
7. S. Popovics, A review of the concrete consolidation by vibration, Matériaux et Constructions, vol. 1973, Vol. 6 - No. 36, pp. 453–463.10.1007/BF02473784 ↗
8. Analysing entrapped pores in concrete via x-ray computed tomography: Influence of workability and compaction time10.1016/j.conbuildmat.2024.135322 ↗
9. Prediction of effective vibration condition under air void reduction using mortar rheological constant
10. Performance assessment of eco-efficient concrete with ternary blended cementitious materials considering the effect of binder component fineness
11. Concrete with clinker-efficient cements - Robustness to variations in water content and temperature10.1002/cepa.2928 ↗
12. Mechanisms of air bubble rise in cement suspensions studied by X-ray analysis10.1016/j.conbuildmat.2024.139330 ↗
13. 2024
14. The influence of aggregate content and aggregate grading on the air bubble rise in fresh concrete
15. DIN EN 1097-7:2008-06, Tests for mechanical and physical properties of aggregates - Part 7: Determination of the particle density of filler - Pyknometer method; German version EN 1097-7:2008, Berlin.
16. DIN EN 196-6:2019-03, Methods of testing cement - Part 6: Determination of fineness; German version EN 196-6:2018, Berlin.
17. DIN ISO 13320:2022-12, Particle size analysis - Laser diffraction methods, Berlin.
18. EN 196-2:2025, Methods of testing cement – Part 2: Chemical analysis of cement; German version, Berlin.
19. DIN 1045-2, Tragwerke aus Beton, Stahlbeton und Spannbeton -Teil 2: Beton, Berlin.
20. DIN EN 12350-5:2019-09, Testing fresh concrete - Part 5: Flow table test; German version; Deutsche Fassung, Berlin.
21. DIN EN 12350-7:2019 + AC:2022, Testing fresh concrete - Part 7: Air content - Pressure methods; German version.
22. Interlaboratory study on rheological properties of cement pastes and reference substances: comparability of measurements performed with different rheometers and measurement geometries10.1617/s11527-020-01477-w ↗
23. Extension of the Reiner–Riwlin equation to determine modified Bingham parameters measured in coaxial cylinders rheometers10.1617/s11527-012-9902-6 ↗
24. Koehler · A new, portable rheomter for fresh self-consolidating concrete · 2006
25. Deutscher Ausschuss für Stahlbeton - DAfStb
26. Bundesanstalt für Wasserbau (BAW), BAWMerkblatt: Entmischungssensibilität von Beton (MESB), vol. 2019, Nr. 2019/0595/D.
27. Experimental analysis of gas phase dynamics in a lab scale bubble column operated with deionized water and NaOH solution under uniform bubbly flow conditions10.1016/j.ces.2020.116056 ↗
28. Investigating binary granular mixing in a rotating drum using ultrafast X-ray computed tomography10.1016/j.powtec.2024.119964 ↗
29. 3-D shape and velocity measurement of argon gas bubbles rising in liquid sodium by means of ultrafast X-ray CT imaging10.1016/j.flowmeasinst.2023.102503 ↗
30. Real-time data processing for ultrafast X-ray computed tomography using modular CUDA based pipelines10.1016/j.cpc.2023.108719 ↗
31. Simplified beam hardening correction for ultrafast X-ray CT imaging of binary granular mixtures10.3390/s24102964 ↗