Abstract
This paper studied the microscopic and mechanical property degradation of axially compressed concrete with different steel fiber content under chemical erosion and freeze-thaw environment. Concrete cylinders with three types of steel fiber contents (0%, 1%, 2%) were selected to study the durability behavior concerning different environmental effects up to 28 days, which included tap water, 3.5% sodium chloride solution, 10% sodium sulfate solution, 5% sulfuric acid solution, 2 mol/L sodium hydroxide solution, and 100 freeze-thaw cycles. The variation of specimens’ microstructure and axial bearing capacity with different fiber content was studied with the chemical erosion cycle increase, and the mass and pH variations of the specimen were measured. According to the law of micro-cracks, the deterioration degree was judged, and a numerical analysis model was established to quantify the reliability of the structure with different fiber content. The results show that the addition of steel fiber can effectively improve the axial bearing capacity of concrete, and a freeze-thaw environment and chemical erosion can accelerate fiber-reinforced concrete’s failure. The optimal content of steel fiber was determined, which is 1% for sodium chloride and sodium sulfate environments, and 2% for the freeze-thaw cycle, dilute sulfuric acid, and sodium hydroxide environments. The finite element software Abaqus was used to simulate and analyze the freeze-thaw cycle and mechanical test of concrete, which verified the rationality of the test results. Research results will provide a theoretical basis for predicting the performance deterioration of steel fiber reinforced concrete under different erosion conditions and periods.
Highlights
As a primary building material, concrete occupies half of the building structure and road and bridge traffic materials with many advantages such as high strength, easy plasticity, and good economy
It is not easy to obtain an analytical model that can be conveniently used to estimate the contribution of fiber to the structural capacity of reinforced concrete members. e meso-model is used to simulate the designed reinforced concrete-steel fiber reinforced concrete beam; the crack width, average crack spacing, deflection, ultimate load, and service load are compared with the design results [39]; and the results have shown that the use of this numerical approach is very appealing to be employed in the design of SFRC structural elements
Ere are few comprehensive comparative studies on mechanical properties and durability of steel fiber reinforced concrete with different content under freeze-thaw cycles and various chemical attacks to improve the durability of concrete in a complex environment. is paper studies the mechanical properties of concrete under the influence of various adverse environmental factors by adding steel fibers with different contents and analyzes the deterioration process of microstructure
Summary
As a primary building material, concrete occupies half of the building structure and road and bridge traffic materials with many advantages such as high strength, easy plasticity, and good economy. E longer the fiber length and more extensive the fiber content exerted, the greater the compressive strength, proving that adding steel fiber into concrete showed good freeze-thaw resistance [12–14]. Ere are few comprehensive comparative studies on mechanical properties and durability of steel fiber reinforced concrete with different content under freeze-thaw cycles and various chemical attacks to improve the durability of concrete in a complex environment. 2. Materials and Methods e composition materials of the specimen include coarse aggregate, fine aggregate, cement, water, and steel fiber. Total 153 samples are used in this experiment, which considered three different steel fiber contents, six different corrosion environments (water, sodium chloride solution, sodium sulfate solution, dilute sulfuric acid solution, sodium hydroxide solution, and freeze-thaw cycle), and two times of erosion.
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