Title:
Study on Pore Characteristics of Microfoam Concrete Based on Different Mixing Ratios
Author(s):
C. Jin, N. Jiang, H. Li, C. Liu, A. Cao, J. Wang, and X. Wen
Publication:
Materials Journal
Volume:
121
Issue:
3
Appears on pages(s):
17-28
Keywords:
fractal dimension; porosity; recycled micro powder
DOI:
10.14359/51740703
Date:
5/1/2024
Abstract:
The use of construction waste to prepare recycled micro powder
can improve the use of construction waste resources and effectively
reduce carbon emissions. In this paper, researchers used
waste concrete processing micro powder to prepare foam concrete
(FC) and quantitatively characterized the performance and pore
structure of FC by scanning electron microscopy (SEM), pore
and fissure image recognition and analysis system (PCAS), and
mechanical property testing methods with different mixing ratios
of micro powder. The results showed that the effect of single mixing
of micro powder or fly ash is better than the composite mixing test,
and the optimal proportion of compressive strength of single mixing
of micro powder is higher than that of single mixing of fly ash. The
optimum mixing ratio is 6:4 between cement and micro powder,
and the best effect is achieved when the micro powder mixing
amount is 40%. Single or double mixing can fill the pores between
the foam and strengthen the performance of the substrate. The tests
of single-mixed or compound-mixed micro powder showed that the
fractal dimension decreased with the increase of porosity; when
the fractal dimension of the specimen increased, the average shape
factor became smaller, the compressive strength decreased, and the
water absorption rate increased.
Related References:
1. Tingting, X.; Ningshan, J.; Lianxin, L.; Lin, G.; and Peng, W., “Study on the Effect of External Additives on the Strength and Dry Density of Foam Concrete,” Journal of Qinghai University, V. 31, No. 6, 2013, pp. 19-23.
2. Othuman Mydin, M. A., and Wang, Y. C., “Structural Performance of Lightweight Steel-Foamed Concrete-Steel Composite Walling System under Compression,” Thin Wall Structures, V. 49, No. 1, 2011, pp. 66-76. doi: 10.1016/j.tws.2010.08.007
3. British Cement Association, “Foam Concrete – Composition and Properties,” Camberley, UK, 1994, 4 pp.
4. Dransfield, J. M., “Foam Concrete: Properties, Applications and Potential,” Foam Concrete: An Introduction to the Product and Its Properties, One Day Awareness Seminar, University of Dundee, Dundee, UK, 2000, pp. 1-11.
5. Jones, M. R., and McCarthy, A., “Preliminary Views on the Potential of Foamed Concrete as a Structural Material,” Magazine of Concrete Research, V. 57, No. 1, 2005, pp. 21-31. doi: 10.1680/macr.2005.57.1.21
6. Huang, H.; Gong, N.; Mu, C.; Zhou, H.; and Liu, W., “Dynamic Mechanical Properties and Constitutive Relationship of Foam Concrete,” Jianzhu Cailiao Xuebao, V. 23, No. 2, 2020, pp. 466-472. (in Chinese)
7. Visagie, M., and Kearsly, E. P., “Properties of Foamed Concrete as Influenced by Air-Void Parameters,” Concrete Beton, V. 101, 2002, pp. 8-14.
8. Nambiar, E. K. K., and Ramamurthy, K., “Air-Void Characterisation of Foam Concrete,” Cement and Concrete Research, V. 37, No. 2, 2007, pp. 221-230. doi: 10.1016/j.cemconres.2006.10.009
9. Pang, C. M., and Wang, S., “Void Characterization and Effect on Properties of Foam Concrete,” Journal of Building Materials, V. 20, No. 1, 2017, pp. 93-98. (in Chinese)
10. Zhang, X.; Wang, W.; Yang, D.; and Zhang, L., “Characteristic on Pore Structure of Foamed Concrete and Study Development of its Effecting Factors,” China Concrete and Cement Products, No. 7, 2018, pp. 63-68. (in Chinese)
11. Hilal, A. A.; Thom, N. H.; and Dawson, A. R., “On Entrained Pore Size Distribution of Foamed Concrete,” Construction and Building Materials, V. 75, 2015, pp. 227-233. doi: 10.1016/j.conbuildmat.2014.09.117
12. Fang, Y.; Wang, R.; Pang, E.; and Yue, Z., “Relationship Between Compressive Strength and Pore Structure of Cement-Fly Ash Foam Concrete,” Journal of Silicates, V. 38, No. 4, 2010, pp. 621-626. (in Chinese)
13. Liu, M., “Research on the Performance of Recycled Powder Foam Concrete,” dissertation, Yangzhou University, Yangzhou, China, 2021. (in Chinese)
14. Nan, H., “Application of Fly Ash Concrete and its Long-Term Significance,” Building Materials Technology and Application, No. 4, 2010, pp. 23-24. (in Chinese)
15. JC/T 2199-2013, “Foam Agent for Foam Concrete,” Standardization Administration of China, Beijing, China, 2013. (in Chinese)
16. GB/T 17671-2021, “Test Method for Strength of Cementitious Sand (ISO Method),” Standardization Administration of China, Beijing, China, 2021. (in Chinese)
17. Zhang, J., “Research on the Preparation and Performance of Recycled Micronized Foam Concrete,” Qinghai University, Qinghai, China, 2020. (in Chinese)
18. JG/T 266-2011, “Foam Concrete,” Standardization Administration of China, Beijing, China, 2011. (in Chinese)
19. JGJ/T 341-2014, “Technical Specification for Application of Foam Concrete,” Standardization Administration of China, Beijing, China, 2014. (in Chinese)
20. Wang, Q., “Fractal Theory and its Application in Hydrology,” Shanxi Water Resources Science and Technology, No. 3, 2003, pp. 21-23. (in Chinese)
21. Liu, P.; Liu, W.; and Xu, H., “Quantitative Evaluation of Dolomite Dissolution Pore Structure Based on SEM and PCAS,” Geological Hazards and Environmental Protection, V. 34, No. 1, 2023, pp. 59-63. (in Chinese)
22. Wei, J.; Yu, Q.; Zeng, X.; and Bai, R., “Study on the Fractal Dimension of Pore Structure in Concrete,” Journal of South China University of Technology, No. 2, 2007, pp. 121-124.