The Influence of Aspect Ratio of Steel Fibers on the Conductive and Mechanical Properties of Compound Cement Reactive Powder Concrete
Source abstract
Abstract
The performance of steel fibers reinforced RPC has a great relationship with the aspect ratio of the fibers. It is necessary to systematically study the relationship between the aspect ratio and the mechanical properties of RPC and the force-electricity response. In this paper, the flexural strength, the compressive strength and the flexural toughness and AC electrical resistance and AC impedance spectroscopy of reactive powder concrete are investigated. The flexural strength, compressive strength, and flexural toughness with the curing age of 1 day and 28 days are tested. The cement is the compound cement in this study, and the mass ratio of ordinary portland cement and sulphoaluminate cement is 1:1, and two kinds of steel fibers with aspect ratios of 30(AR-30) and 75(AR-75) are used. The fiber content is 2% of the concrete volume. Scanning electron microscope (SEM) and scanning electron microscope energy spectrum analysis (EDS) are investigated to analyze the composition of the hydration products. It can be obtained from the research results that the flexural strength and the compressive strength of reactive powder concrete decrease with the increase of steel fibers content with an aspect ratio of 30. The decreasing rates of the flexural strength and the compressive strength with the curing age of 1 d and 28 d are 14.93%~83.26% and 0.40%~46.36% with the incorporation of steel fibers with an aspect ratio of 30. The flexural toughness decreases in the form of a quadratic function with the mass ratio of steel fibers with an aspect ratio of 30. The electrical resistance of reactive powder concrete increases with the increase of steel fibers with an aspect ratio of 30. The maximum decreasing rate of electrical conductivity is 91.16%. The AC impedance spectrum is obtained, and the electric circuit of reactive powder concrete accords with the series conduction model, which parallel electrical resistance and capacitance of pore solution, rapid strength RPC and steel fibers respectively connect with a contact resistance of the electrode and specimens. It is found that the steel fibers network with an aspect ratio of 75 is closer by studying the equivalent circuit diagram.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Innovative concrete reinforcement materials · Smart Materials for Construction · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering and Geographical Environment, Ningbo University, Ningbo 315000, China
School of Civil Transportation Engineering, Ningbo University of Technology, Ningbo 315000, China
Engineering Research Center of Industrial Construction in Civil Engineering of Zhejiang, Ningbo University of Technology, Ningbo 315000, China
Funding
Natural Science Foundation of China · Natural Science Foundation of Zhejiang Province, China
References (39)
Show source-provided references
1. Future trends and development characteristics of cement industry
2. Emergency Repair treatment of cement concrete bridge deck open to traffic damage
3. Corrosion status of concrete bridges at home and abroad
4. Accelerated construction of urban intersections with Portland Cement Concrete Pavement (PCCP)
5. Study on basic mechanical properties of hybrid fiber recycled concrete for rapid pavement repair
6. Study on ultra high early strength sulphoaluminate cement concrete in concrete pavement repair
7. Electrical impedance tomography-based sensing skin
8. Hydration Based Dynamic Calculation Model for Electric Conductivity of Hardened Cement Paste
9. Wang, H., Cai, X., Rao, C., Wang, K., and Wang, J. (2022). Mechanical and Electrical Properties of Rapid-Strength Reactive Powder Concrete with Assembly Unit of Sulphoaluminate Cement and Ordinary Portland Cement. Materials, 15.10.3390/ma15093371 ↗
10. Application of nondestructive testing technology in road and bridge detection
11. Shrinkage and creep of high-performance concrete based on calcium sulfoaluminate cement10.1016/j.cemconcomp.2019.02.006 ↗
12. Gołaszewska, M., Klemczak, B., and Gołaszewski, J. (2021). Thermal Properties of Calcium Sulphoaluminate Cement as an Alternative to Ordinary Portland Cement. Materials, 14.10.3390/ma14227011 ↗
13. Mechanical behaviour of micro-fifine steel fifibre reinforced sulphoaluminate cement composite10.1016/j.conbuildmat.2018.03.065 ↗
14. Strengthening of ordinary vibrated concrete using steel fibers self-compacting concrete10.1080/01694243.2020.1712769 ↗
15. Experimental study on flexural behaviour of reinforced reactive powder concrete pole10.1016/j.conbuildmat.2021.125399 ↗
16. Experimental study on mechanical property and durability of reactive powder concrete
17. Early cracking resistance of reactive powder concrete mixed with steel fiber
18. Meso-scale investigations on the effective thermal conductivity of multi-phase materials using the finite element method10.1016/j.ijheatmasstransfer.2020.119383 ↗
19. Effects of the mixed optimization of PCE on pore structure evolution of cement mortar
20. Performance Research on the Sulfoaluminate Cement Based Rapid Repairing Materials
21. Multi-functional properties of carbon nanofiber reinforced reactive powder concrete10.1016/j.conbuildmat.2018.07.229 ↗
22. Reinforcement effect and mechanism of carbon fibers tomechanical and electrically conductive properties of cement-based materials10.1016/j.conbuildmat.2016.08.063 ↗
23. Effective fiber type investigation on the shear behavior of ultrahigh-performance fiber-reinforced concrete beams10.1177/1369433218820788 ↗
24. Study on improving frost thaw resistance and corrosion resistance of bridge concrete with carbon nanofibers
25. Application of polyacrylonitrile fiber in improving concrete performance
26. Study on the influence of different amount of steel fiber on mechanical properties of concrete
27. Evaluation of carbon fiber dispersion in cement-based materials using mechanical properties, conductivity, mass variation coefficient, and microstructure10.1016/j.conbuildmat.2020.120891 ↗
28. Surface hydrophilic modification of polypropylene fibers and their application in fiber-reinforced cement-based materials10.1080/00222348.2020.1846953 ↗
29. Research on factors affecting the strength of high performance concrete
30. Application and research progress of steel fiber reinforced concrete
31. The influence of steel fiber content on mechanical properties of concrete
32. Rheological behavior of calcium sulfoaluminate cement paste with supplementary cementitious materials10.1016/j.conbuildmat.2020.118234 ↗
33. (1919). Method of Testing Cements-Determination of Strength (Standard No. GB/T17671-1999).
34. Research on the self-sensing and mechanical properties of aligned stainless steel fiber reinforced reactive powder concrete10.1016/j.cemconcomp.2021.104001 ↗
35. Experimental Study on Mechanical Properties of Hybrid Fiber UHPC
36. Experimental Research on Flexural Toughness of Steel Fiber Reinforced Concrete
37. Conductive mechanism and hydration property of cement-based materials with steel fibers
38. Effect of Dispersion of AC Impedance Spectroscopy of Cement-based Materials with Fly Ash
39. Cui, L., and Wang, H. (2021). Research on the Mechanical Strengths and the Following Corrosion Resistance of Inner Steel Bars of RPC with Rice Husk Ash and Waste Fly Ash. Coatings, 11.10.3390/coatings11121480 ↗