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This study focuses on the dynamic compression performance of corroded steel fiber-reinforced concrete (SFRC) exposed to drying–wetting chloride cycles by a 37 mm diameter split Hopkinson pressure bar (SHPB) system. Three steel fiber contents (0.5%, 1.0%, 2.0%, by volume) were incorporated into concrete, and samples were subjected to drying–wetting cycles for different corrosion durations (30 days, 60 days, 90 days) after 28 days age. The sample damage mode, stress–strain curve and the dynamic compression performance of corroded SFRC were compared with plain concrete. Through the experimental data, strain-rate effect, fiber reinforcement effect and the corrosion duration influence on the impact compression property of SFRC were identified. The dynamic increase factor results of these samples were compared with the existing models in previous published literature. An empirical dynamic increase factor profile characterization model considering fiber content, corrosion duration and strain-rate is proposed.
Hui Chen; Xiangqiang Zhou; Qiang Li; Rui He; Xin Huang. Dynamic Compressive Strength Tests of Corroded SFRC Exposed to Drying–Wetting Cycles with a 37 mm Diameter SHPB. Materials 2021, 14, 2267 .
AMA StyleHui Chen, Xiangqiang Zhou, Qiang Li, Rui He, Xin Huang. Dynamic Compressive Strength Tests of Corroded SFRC Exposed to Drying–Wetting Cycles with a 37 mm Diameter SHPB. Materials. 2021; 14 (9):2267.
Chicago/Turabian StyleHui Chen; Xiangqiang Zhou; Qiang Li; Rui He; Xin Huang. 2021. "Dynamic Compressive Strength Tests of Corroded SFRC Exposed to Drying–Wetting Cycles with a 37 mm Diameter SHPB." Materials 14, no. 9: 2267.
In this work, the relationships between the mechanical properties (i.e., compressive strength and flexural strength) and loading speed of polypropylene fiber (PPF)-incorporated cement mortar at different ages (before 28 days) were studied. A total of 162 cubic samples for compressive strength tests and 162 cuboid samples for flexural strength tests were casted and tested. Analytical relationships between the sample properties (i.e., sample age, PPF content, and loading speed) and compressive and flexural strength were proposed based on the experimental data, respectively. Of the predicted compressive and flexural strength results, 70.4% and 75.9% showed less than 15% relative error compared with the experimental results, respectively.
Hui Chen; Xin Huang; Rui He; Zhenheng Zhou; Chuanqing Fu; Jiandong Wang. Mechanical Properties of Polypropylene Fiber Cement Mortar under Different Loading Speeds. Sustainability 2021, 13, 3697 .
AMA StyleHui Chen, Xin Huang, Rui He, Zhenheng Zhou, Chuanqing Fu, Jiandong Wang. Mechanical Properties of Polypropylene Fiber Cement Mortar under Different Loading Speeds. Sustainability. 2021; 13 (7):3697.
Chicago/Turabian StyleHui Chen; Xin Huang; Rui He; Zhenheng Zhou; Chuanqing Fu; Jiandong Wang. 2021. "Mechanical Properties of Polypropylene Fiber Cement Mortar under Different Loading Speeds." Sustainability 13, no. 7: 3697.
Moisture with harmful ions penetrates into the interior of concrete, which causes deterioration of the concrete structure. In this study, a moisture saturation equilibrium relationship of concrete was tested under different temperatures and relative humidity conditions to develop moisture absorption and desorption curves. Based on experimental data and numerical simulation, a model of moisture transport in concrete was established. The results from the model indicate that the moisture absorption rate was lower at higher temperatures and largely dependent on the saturation gradient, while the desorption was increased at higher temperatures and mostly affected by the saturation gradient. The proposed model was highly in agreement with the experimental data.
Qingzhang Zhang; Zihan Kang; Yifeng Ling; Hui Chen; Kangzong Li. Influence of Temperature on the Moisture Transport in Concrete. Crystals 2020, 11, 8 .
AMA StyleQingzhang Zhang, Zihan Kang, Yifeng Ling, Hui Chen, Kangzong Li. Influence of Temperature on the Moisture Transport in Concrete. Crystals. 2020; 11 (1):8.
Chicago/Turabian StyleQingzhang Zhang; Zihan Kang; Yifeng Ling; Hui Chen; Kangzong Li. 2020. "Influence of Temperature on the Moisture Transport in Concrete." Crystals 11, no. 1: 8.
Recycled construction and demolition (C&D) materials have recently gained attention as valuable resources and are widely applied in pavements, ground improvements, and engineered fills. However, the large amounts of solid waste generated by C&D sectors have imposed significant pressure on the environment. Current studies primarily focus on the physical properties and shear strength responses of C&D materials. In this study, the dynamic behaviors (dynamic stress-strain behavior and liquefaction resistance) of recycled concrete aggregate (RCA) and quartz sand in an undrained condition were investigated through cyclic triaxial tests and compared. It was observed that RCA has a higher liquefaction resistance than quartz sand, which had a beneficial effect on the earthquake response. Meanwhile, owing to its mineralogy, RCA was crushed during cyclic loading, which decreased the liquefaction resistance especially under a higher confining pressure. The effects of crushability of the RCA on the dynamic behavior were discussed. Finally, the sensitivity of liquefaction resistance to the B value was examined.
Bo Li; Yao Wang; Quanbin Jin; Hui Chen. Liquefaction characteristics of recycled concrete aggregates. Soil Dynamics and Earthquake Engineering 2019, 120, 85 -96.
AMA StyleBo Li, Yao Wang, Quanbin Jin, Hui Chen. Liquefaction characteristics of recycled concrete aggregates. Soil Dynamics and Earthquake Engineering. 2019; 120 ():85-96.
Chicago/Turabian StyleBo Li; Yao Wang; Quanbin Jin; Hui Chen. 2019. "Liquefaction characteristics of recycled concrete aggregates." Soil Dynamics and Earthquake Engineering 120, no. : 85-96.
The influences of corrosion and the strain rate on the mechanical performance of corroded steel fibers were assessed in this paper. The steel fibers were corroded to different corrosion degrees by drying-wetting cycling in a 5% sodium chloride solution and a 50° centigrade oven. The static and dynamic tensile tests of corroded steel fibers were investigated by using a static and dynamic test system. The results showed that the mechanical properties of the corroded steel fibers were strain-rate dependent. With an increase in strain rate, the ultimate load increased, whereas, the strain-rate effect decreased with an increase in the corrosion degree. However, variations in Young's modulus with strain rate and corrosion degree were not obvious. With an increase in the corrosion degree, both the nominal tensile strength and elongation of the corroded steel fibers decreased. However, the ultimate strength based on the minimum cross-sectional area did not decrease. The strength could be attributed to the uneven distribution of the cross-sectional area along the bar. Based on the experimental results, a time-dependent assessment method for the mechanical behavior of corroded steel fibers under the static and dynamic loading conditions was proposed.
Hui Chen; Bo Li; Yanru Wang. Experimental study on mechanical properties of corroded steel fibers under static and dynamic loading. Materials and Corrosion 2017, 69, 941 -951.
AMA StyleHui Chen, Bo Li, Yanru Wang. Experimental study on mechanical properties of corroded steel fibers under static and dynamic loading. Materials and Corrosion. 2017; 69 (7):941-951.
Chicago/Turabian StyleHui Chen; Bo Li; Yanru Wang. 2017. "Experimental study on mechanical properties of corroded steel fibers under static and dynamic loading." Materials and Corrosion 69, no. 7: 941-951.