Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Laboratory investigation of mechanical properties and durability of lightweight concrete reinforced with polymer fibers and basalt fibers in single and hybrid forms

Document Type : Original Article

Authors
Mehdi Khoshvatan 1
Peyman Maleki 2
1 Instructor, Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
2 Msc. Department of Civil Engineering, Islamic Azad University, Borujard Branch, Borujard, Iran
10.22065/jsce.2024.402870.3151
Abstract
In order to reduce the weight of structures, reduce dead load and improve seismic performance, lightweight concrete can be used. Due to the use of lightweight materials that have a brittle and porous structure, the mechanical properties and durability of lightweight concrete are weaker than ordinary concrete. To improve the weaknesses of lightweight concrete, optimal amounts of fibers can be used in lightweight concrete mix design. In this article, the effect of using different amounts of polymer fibers and basalt, single and combined, on the mechanical properties and durability was investigated. A number of 124 cylindrical samples with a size of 300 x 150 mm were made for compressive strength and tensile strength tests. Also, 248 cylindrical samples with a size of 200 x 100 mm were made for tests. Experiments were performed on different samples for the ages of 28 and 90 days. The results showed that the addition of 1% polymer fibers increased the compressive strength by 24.4% and 26.92%, and the tensile strength by 66.12% and 72.22%, as well as the addition of 1.75% basalt fibers. increases by 18.13% and 14.93% and tensile strength by 41.93% and 47.22% at the ages of 28 and 90 days compared to the sample without fibers. Also, the addition of 1.25% basalt fibers had the best performance in improving the durability of lightweight concrete, so the amount of final water absorption of lightweight concrete decreased to 31.93% and 45.38%. Adding the optimal amount of fibers increased the electrical resistance to 46.54% -46.42%, and also caused the penetration of chloride ions into lightweight concrete at the ages of 28 and 90 days by 39.67% and 43.15% respectively. be reduced to a fiber-free sample. it was concluded that polymer fibers have the greatest effect in improving the mechanical properties of lightweight concrete.
Keywords
Structural lightweight concrete
mechanical properties
Durability of lightweight concrete
Fiber reinforced lightweight concrete
Basalt fiber
Polymer fiber

Subjects

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  • Receive Date 27 June 2023
  • Revise Date 05 September 2023
  • Accept Date 04 January 2024