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A newly proposed modified non-contact electrical resistivity measurement was used to test the resistivity of concrete and cement mortar. The oxygen diffusion coefficients of concrete and mortar were determined by a gas diffusion measurement, and the capillary porosity of concrete and cement mortar was measured by mercury intrusion porosimetry (MIP) measurement. The obtained electrical resistivity and capillary porosity results were verified with other researchers’ data, the measured electrical resistivity results can be estimated by a simple equation from the capillary porosity results. The obtained oxygen diffusion coefficient results were quantitatively correlated with capillary porosity and electrical resistivity measurement results. The proposed equations can be practically used to assess the electrical resistivity and oxygen diffusion coefficient.
Renzhan Zhou; Qiang Li; Jiandong Wang; Kewen Zhou; Rui He; Chuanqing Fu. Assessment of Electrical Resistivity and Oxygen Diffusion Coefficient of Cementitious Materials from Microstructure Features. Materials 2021, 14, 3141 .
AMA StyleRenzhan Zhou, Qiang Li, Jiandong Wang, Kewen Zhou, Rui He, Chuanqing Fu. Assessment of Electrical Resistivity and Oxygen Diffusion Coefficient of Cementitious Materials from Microstructure Features. Materials. 2021; 14 (12):3141.
Chicago/Turabian StyleRenzhan Zhou; Qiang Li; Jiandong Wang; Kewen Zhou; Rui He; Chuanqing Fu. 2021. "Assessment of Electrical Resistivity and Oxygen Diffusion Coefficient of Cementitious Materials from Microstructure Features." Materials 14, no. 12: 3141.
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.
This study investigated the effective chloride diffusion coefficient of cement mortar with different water-to-cement ratio (w/c) under electrical accelerated migration measurement. The cumulative chloride concentration in anode cell solution and the cumulative chloride concentration drop in the cathode cell solution was measured by RCT measurement and the results were further used to calculate the chloride diffusion coefficient by Nordtest Build 355 method and Truc method. The influence of w/c on cement mortar’s chloride coefficient was investigated and the chloride diffusion coefficient under different determination methods were compared with other researchers’ work, a good consistency between this work’s results and literatures’ results was obtained. The results indicated that the increased w/c of cement mortar samples will have a higher chloride diffusion coefficient. The cumulative chloride concentration drop in the cathode cell solution will have deviation in early stage measurement (before 60 h) which will result in overestimation of the effective chloride diffusion coefficient.
Jianlan Chen; Jiandong Wang; Rui He; Huaizhu Shu; Chuanqing Fu. Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements. Crystals 2021, 11, 240 .
AMA StyleJianlan Chen, Jiandong Wang, Rui He, Huaizhu Shu, Chuanqing Fu. Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements. Crystals. 2021; 11 (3):240.
Chicago/Turabian StyleJianlan Chen; Jiandong Wang; Rui He; Huaizhu Shu; Chuanqing Fu. 2021. "Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements." Crystals 11, no. 3: 240.