Volume 23, Issue 5 (2023)                   MCEJ 2023, 23(5): 85-113 | Back to browse issues page

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Mahboubi Niazmandi M, Gholizadeh M. Experimental Evaluation of the Strength Properties of Reactive Powder Concrete (RPC) Produced with Indigenous Materials Containing Industrial Steel Fibers. MCEJ 2023; 23 (5) :85-113
URL: http://mcej.modares.ac.ir/article-16-67246-en.html
1- Ph.D Graduated in Geotechical Engineering, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, IranUniversity Lecturer, Faculty of Civil Engineering, Mehraeen Institute of Higher Education, Bandar Anzali, Gilan, Iran , m.mahboubi@sutech.ac.ir
2- Ph.D. Candidate of Engineering and Construction Management, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
Abstract:   (750 Views)
Reactive powder concrete (RPC) is one of the ultra-high strength concretes with superior mechanical properties, which is made using cement and very fine powder materials such as quartz sand, microsilica, low amounts of water-cement ratio, super-lubricant and steel fibers. The main role of steel fibers in such concrete is actually a type of composite that has proper integrity and continuity and enables the use of concrete as a flexible material. The present study aimed to evaluate the effect of using different types of industrial steel fibers with different length (diameter) and percentages on the strength properties of RPC and to determine a series of experimental relationships for their estimation. To this end, by preparing three types of steel fibers with small diameters (group 1), medium (group 2) and large (group 3) and making a number of RPC samples using indigenous and common mineral materials, the strength characteristics of this type of concrete include compressive, bending and tensile strengths were determined at different ages. To investigate the effect of curing time as well as the diameter and percentage of steel fibers on the compressive strength of RPC, a total of 39 samples + 1 sample without fibers (control concrete) containing 1 to 5% of large steel fibers (with diameter of 0.8 mm), medium (with diameter of 0.6 mm) and small (with diameter of 0.4 mm) were made and their compressive strength was determined at different ages. In addition, to determine the bending and tensile strengths of RPC samples, a total of 18 standard RPC beam and cylindrical samples containing different percentages of medium diameter steel fibers were made. After these samples were cured, their 28-day strength was evaluated in comparison with the control samples. The results of compressive strength tests showed that by increase in the curing age, the strength of RPC increases in compared with the control sample (without fibers). The results of compressive strength tests showed that by reduce in the diameter of steel fibers, the 28-day compressive strength of RPC samples increased significantly and was determined to 423.5 MPa. In compared with the control sample (without fibers), the compressive strength is associated with a growth of 29.11%. Also, the optimal amount of medium steel fibers to achieve RPC with the highest strength was determined to be 2%. The results of flexural strength tests showed that 2% of group 1 steel fibers (with small diameter) and group 2 (with medium diameter) and 3% of group 3 steel fibers (with large diameter) as the optimal percentage of steel fibers to reach the maximum flexural strength in RPC. Therefore, the 28-day flexural strength of RPC samples containing 2%, 2%, and 3% of steel fibers of groups 1, 2, and 3, respectively, was equal to 40.9, 44.6, and 39.1 MPa. The highest tensile strength of RPC samples containing 1%, 2%, and 3% of steel fibers of groups 1, 2, and 3 compared to the control sample, was associated with a growth of 61.25%, 66.42%, and 68.21%, respectively. Also, the results of the tensile strength tests showed that the addition of group 2 steel fibers (medium) compared to the other two groups (small and large), had a greater impact on the growth percentage of tensile strength of RPC samples.
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Article Type: Original Research | Subject: Civil and Structural Engineering
Received: 2023/02/2 | Accepted: 2023/06/21 | Published: 2023/11/1

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