Investigation of combined use of fiber microgels containing polypropylene fibers and steel fibers on mechanical properties of concrete

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Pirmohammadi Alishah Farhad; Mohammadrezaei Mehdi

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Journal Paper

Paper Information

Journal: JOURNAL OF CONCRETE RESEARCH Year:2024 | Volume:17 | Issue:1 Page(s): 57-75

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Information Journal Paper

Title

Investigation of combined use of fiber microgels containing polypropylene fibers and steel fibers on mechanical properties of concrete

Author(s)

Pirmohammadi Alishah Farhad | Mohammadrezaei Mehdi | Issue Writer Certificate

Keywords

Microgel fiber

Miro-silica

Pp fiber

steel fiber

Fiber concrete

Abstract

Concrete is one of the widely consumed building materials in the construction industry, Among the specifications of the concrete which have been paid attention to by the researchers are compressive strength and tensile strength. So, to attain this goal, in the recent years, using a less ratio of water to cement with superplasticizers and natural and or synthetic pozzolans and also with fibers of different materials and specifications in the concrete mixture is a normal method. In this research, the effect of the combined use of fibre microgels and steel fibres on the mechanical properties and durability of concrete has been studied in a laboratory. Fiber microgels include micro-silica (silica fume), polypropylene fibers (pp fibers) and superplasticizers. Consumable steel fibers are 5 cm long and 0.8 mm in diameter with a hooked end. The effect of microgels and steel fibers were each compared and evaluated in five ratios of fibrous microgels 0, 0.5, 1, 2, 5% and steel fibers in ratios of 0, 05, 1, 1.5, 2%. A total of 25 mixing designs were tested for compressive and flexural strength to evaluate mechanical properties. The results of compressive and bending strength tests have shown that by adding different percentages of fibers, the percentage of increase in compressive strength in most of the 7-day samples has improved more than the 28-day samples. The highest resistance growth was related to the samples containing 5% fibrous microgel and 2% steel fibers.

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