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Prof. Dr. Li Li
College of Water Resources and Architectural Engineering, Northwest A&F University, No. 23, Wei Hui Rd., Yangling 712100, China

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0 Building Materials
0 Concrete
0 Microstructure
0 Rheology
0 geopolymer

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Journal article
Published: 11 June 2021 in Materials
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In high–strength concrete, the reinforcement concentration will cause some problems in the beam–column joints (BCJs) due to a large amount of transverse reinforcement. Hence, the main object of this paper is to prevent the reinforcement concentration and reduce the amount of transverse reinforcement in the BCJs through the ideal usage of steel fibers and reinforced high–strength concrete. Pseudo–static tests on seven specimens were carried out to investigate and evaluate the seismic performance of beam–column joints in steel fiber reinforced high–strength concrete (SFRHC). Test variables were steel fiber volume ratio, concrete strength, the stirrup ratio in the core area, and an axial compression ratio of the column end. During the test, the hysteresis curves and failure mode were recorded. The seismic indicators, such as energy dissipation, ductility, strength, and stiffness degradation, were determined. The experimental results indicated that the failure modes of SFRHC beam–column joints mainly included the core area failure and the beam end bending failure. With the increase in stirrup ratio, volume ratio of steel fiber, and axial compression ratio in the core area, both the ductility and energy consumption of beam–column joints increased, while the opposite was true for concrete strength.

ACS Style

Ke Shi; Mengyue Zhang; Tao Zhang; Pengfei Li; Junpeng Zhu; Li Li. Seismic Performance of Steel Fiber Reinforced High–Strength Concrete Beam–Column Joints. Materials 2021, 14, 3235 .

AMA Style

Ke Shi, Mengyue Zhang, Tao Zhang, Pengfei Li, Junpeng Zhu, Li Li. Seismic Performance of Steel Fiber Reinforced High–Strength Concrete Beam–Column Joints. Materials. 2021; 14 (12):3235.

Chicago/Turabian Style

Ke Shi; Mengyue Zhang; Tao Zhang; Pengfei Li; Junpeng Zhu; Li Li. 2021. "Seismic Performance of Steel Fiber Reinforced High–Strength Concrete Beam–Column Joints." Materials 14, no. 12: 3235.

Journal article
Published: 02 May 2021 in Buildings
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Coal bottom ash (CBA) is one of the by-products that can be employed as fine aggregate to replace natural sand in concrete. Owing to the very low water demand, roller-compacted concrete (RCC) has the potential to use CBA as fine aggregate at a high proportion. However, little research about RCC using CBA entirely as fine aggregate has been conducted. In this study, the uniaxial compressive strength, deformation, stress–strain curves, and splitting tensile strength of CBA-containing RCC (CBA RCC) were studied to bridge this gap. The compressive strength, elasticity modulus, and splitting tensile strength of all mixtures decreased with increasing CBA content. The relationship between compressive strength and splitting tensile strength of CBA RCC was proposed, which is very close to that recommended by the CEB-FIP code. The uniaxial compressive constitutive model based on the continuum damage theory can well illustrate the stress–strain relationship of CBA RCC. The growth process of damage variable demonstrates the hybrid effect of coarse aggregate, cement, and compacting load on delaying damage under uniaxial compression. The theoretical formula can also accurately illustrate the stress–strain curves of RCC presented in the literature studies.

ACS Style

Yu Li; Li Li; Vivek Bindiganavile. Constitutive Model of Uniaxial Compressive Behavior for Roller-Compacted Concrete Using Coal Bottom Ash Entirely as Fine Aggregate. Buildings 2021, 11, 191 .

AMA Style

Yu Li, Li Li, Vivek Bindiganavile. Constitutive Model of Uniaxial Compressive Behavior for Roller-Compacted Concrete Using Coal Bottom Ash Entirely as Fine Aggregate. Buildings. 2021; 11 (5):191.

Chicago/Turabian Style

Yu Li; Li Li; Vivek Bindiganavile. 2021. "Constitutive Model of Uniaxial Compressive Behavior for Roller-Compacted Concrete Using Coal Bottom Ash Entirely as Fine Aggregate." Buildings 11, no. 5: 191.

Journal article
Published: 23 April 2021 in Construction and Building Materials
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Magnesium phosphate cement (MPC) presents high early strength, fast setting and hardening, excellent bonding performance, and good corrosion and freezing resistance. The excellent performance of MPC enables it to have a wide range of potential applications. However, the brittleness and poor water stability limit its wide application. Incorporating fibres into MPC is a common toughening method, and the bonding between MPC and fibre has a significant impact on the toughening effect. In this paper, effects of the amount of nano-Fe2O3 (NF) and water immersion time on the bonding properties between steel fibre and MPC mortar (MPCM) were investigated using fibre pull-out, compressive, and splitting tensile tests and microstructure analysis. Incorporating NF significantly improved the bonding strength and pull-out energy between steel fibre and MPCM after water immersion. The optimal content of NF was 2 vol%. New hydration products (such as dense iron phosphate) and the compact structure formed with the addition of NF inhibited the interfacial cracks that result from water immersion. This research is very beneficial for construction project applications of fibre-reinforced MPCM in watery environments.

ACS Style

Hu Feng; Xiangyu Zhao; Li Li; Xiaocong Zhao; Danying Gao. Water stability of bonding properties between nano-Fe2O3-modified magnesium-phosphate-cement mortar and steel fibre. Construction and Building Materials 2021, 291, 123316 .

AMA Style

Hu Feng, Xiangyu Zhao, Li Li, Xiaocong Zhao, Danying Gao. Water stability of bonding properties between nano-Fe2O3-modified magnesium-phosphate-cement mortar and steel fibre. Construction and Building Materials. 2021; 291 ():123316.

Chicago/Turabian Style

Hu Feng; Xiangyu Zhao; Li Li; Xiaocong Zhao; Danying Gao. 2021. "Water stability of bonding properties between nano-Fe2O3-modified magnesium-phosphate-cement mortar and steel fibre." Construction and Building Materials 291, no. : 123316.

Journal article
Published: 07 April 2021 in Materials
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Fire is one of the most unfavorable conditions that cement-based composites can face during their service lives. The uniaxial tensile and flexural tensile properties of the steel-polyvinyl alcohol fiber-calcium carbonate whisker (CW) multi-scale fiber reinforced cement matrix composites (MSFRCs) under high temperatures are studied, including strength, deformation capacity, energy dissipation capacity, and its ability to be assessed through the empirical calculation method. The study showed that with the increase of the treatment temperature, the MSFRC residual bending strength, bending toughness, and tensile strength decreased overall, but the decline was slow at 600 °C. The peak flexural deflection and peak tensile strain of MSFRC first reduced and then increased with the increase of the temperature. As the temperature increased, the nominal stiffness of MSFRC bending and straight gradually reduced, and the rate of decline was faster than that of its strength. However, the uniaxial tensile properties were more sensitive to the temperature and degraded more rapidly. A quantitative relationship was established between MSFRC residual bending, tensile strength, and temperature. A comparison with existing research results shows that MSFRC has achieved an ideal effect of high temperature resistance. The multi-scale hybrid fiber system significantly alleviates the deterioration of cement-based composite’s mechanical properties under high temperatures. With the help of an optical microscope and scanning electron microscope (SEM), the high temperature influence mechanism on the uniaxial tensile and flexural properties of MSFRC was revealed.

ACS Style

Li Li; Mehran Khan; Chengying Bai; Ke Shi. Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature. Materials 2021, 14, 1827 .

AMA Style

Li Li, Mehran Khan, Chengying Bai, Ke Shi. Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature. Materials. 2021; 14 (8):1827.

Chicago/Turabian Style

Li Li; Mehran Khan; Chengying Bai; Ke Shi. 2021. "Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature." Materials 14, no. 8: 1827.