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摘要 ：
Alkali-activated brick powder geopolymer (BPG) was prepared by use of brick powder (BP) under the activation of sodium silicate-based activator with silicate modulus of 1.6 and alkali dosages of 2%, 4%, 6%, 8%, and the effect of alkali dosage on the early properties and reaction mechanism of BPG was studied in this paper. Results show that the BPG paste prepared with alkali dosage of 6% exhibits the best fluidity (180 mm). With increasing alkali dosage, the dissolution rate of Al from BP first increases and then decreases. The negative correlation exists between the setting time of BPG and the dissolution rate of Al from BP. The optimal compressive strength reaches 31.1 MPa at the alkali dosage of 6% after cured for 3 days (T = 70?, RH = 30%). Lower or excessive alkali dosage is both unfavorable to the enhancement of strength. The calorimetry, FTIR and NMR results show that the increase in alkali dosage (& LE;6% Na2O) improves the reaction degree, promotes the formation of network structures and increases the Al-rich structural units (Q4(3Al) and Q4(4Al)) due to the beneficial effect of alkali enhancement on dissolution of Al from BP, thereby increasing the polymerization degree of reaction products and enhancing the compressive strength of BPG. However, the higher alkali dosage (8% Na2O) impedes the further dissolution of Al and the formation of Al-rich structural units, which results in the lower reaction degree and compressive strength.
关键词 ：
Alkali dosage Alkali dosage Brick powder Brick powder Chemical structure Chemical structure Early properties Early properties Alkali-activated geopolymers Alkali-activated geopolymers
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| GB/T 7714 | Shen, Jiale , Li, Yue , Lin, Hui et al. Early properties and chemical structure analysis of alkali-activated brick geopolymer with varied alkali dosage [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 60 . |
| MLA | Shen, Jiale et al. "Early properties and chemical structure analysis of alkali-activated brick geopolymer with varied alkali dosage" . | JOURNAL OF BUILDING ENGINEERING 60 (2022) . |
| APA | Shen, Jiale , Li, Yue , Lin, Hui , Lv, Jianfeng , Feng, Shan , Ci, Junchang . Early properties and chemical structure analysis of alkali-activated brick geopolymer with varied alkali dosage . | JOURNAL OF BUILDING ENGINEERING , 2022 , 60 . |
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摘要 ：
Graphene oxide (GO) is an excellent nano reinforcing material. This paper presents the effect of GO addition on the hydration, microstructure and mechanical properties of magnesium phosphate cement (MPC). MPC with GO contents of 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10 % was prepared. The functional groups, mechanical properties, phase composition and reinforcement mechanism of the GO-MPC composites were tested and analysed. The results showed that water adhered to the GO, which led to a decrease in the fluidity of the MPC paste. With increasing GO content, the most probable pore size of MPC first decreased and then increased. By adding 0.04 % GO, the most probable aperture of MPC was reduced from 11.3 mu m to 0.9 mu m. The proper addition of GO could refine the pore size, densify the microstructure and improve the mechanical properties of MPC. An appropriate dosage of GO promoted the hydration of MPC, resulting in more hydration products, including potassium magnesium phosphate hexahydrate (MKP), better growth of MKP with higher crystallinity.
关键词 ：
Mechanical properties Mechanical properties Graphene oxide Graphene oxide Microstructure Microstructure Reinforcement Reinforcement Magnesium phosphate cement Magnesium phosphate cement
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| GB/T 7714 | Fan, Yufeng , Zhang, Guosheng , Li, Yue . Study on graphene oxide reinforced magnesium phosphate cement composites [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 359 . |
| MLA | Fan, Yufeng et al. "Study on graphene oxide reinforced magnesium phosphate cement composites" . | CONSTRUCTION AND BUILDING MATERIALS 359 (2022) . |
| APA | Fan, Yufeng , Zhang, Guosheng , Li, Yue . Study on graphene oxide reinforced magnesium phosphate cement composites . | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 359 . |
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摘要 ：
The effects of loading frequency, temperature and multi-walled carbon nanotubes (MWCNTs) on the energy dissipation property of cement paste were explored in the paper. Energy dissipation was characterized by loss factor (defined as loss modulus /storage modulus E & DPRIME;/E & PRIME;), and the roles of MWCNTs were analyzed emphatically by micro tests. The energy dissipation of cement paste originated from the sliding of C-S-H sheets at nanoscale and the friction of C-S-H globules at microscale. The loss factor decreased with the increase of loading frequency and temperature. After analyzing the micro tests results such as nuclear magnetic resonance and atomic force microscope, the mechanism of MWCNTs enhancing the energy dissipation property of cement paste was pro-posed: (1) at nanoscale, the mean chain length of C-S-H was increased by MWCNTs, leading to the sliding area of C-S-H sheets larger and increasing energy dissipation; (2) at microscale, the morphology of C-S-H gradually changed from globules to foil due to the presence of MWCNTs, which increased the friction area and the energy dissipation was enhanced; (3) MWCNTs were fibrous and bonded with C-S-H, and the friction between the their interfaces dissipated energy under alternating stress; (4) the small pore volume and pore roughness were increased by MWCNTs, which were contributed to increase the energy dissipation.
关键词 ：
Cement paste Cement paste Energy dissipation Energy dissipation Loss factor Loss factor MWCNTs MWCNTs
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| GB/T 7714 | Li, Hongwen , Li, Yue , Jin, Caiyun . The energy dissipation property of MWCNTs/cement paste composites [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 327 . |
| MLA | Li, Hongwen et al. "The energy dissipation property of MWCNTs/cement paste composites" . | CONSTRUCTION AND BUILDING MATERIALS 327 (2022) . |
| APA | Li, Hongwen , Li, Yue , Jin, Caiyun . The energy dissipation property of MWCNTs/cement paste composites . | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 327 . |
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摘要 ：
The reinforced concrete column after corrosion of chloride salt was subjected to magnesium phosphate cement (MPC)-carbon fiber reinforced plastics (CFRP) reinforcement and electrochemical chloride extraction (ECE) integration experiment. The axial compression behavior of the reinforced concrete column was tested, and then the numerical analysis was carried out. Two types of the corroded reinforced concrete columns were prepared for the test. The columns in type 1 were naturally corroded, and the columns in type 2 were electrified to accelerate the corrosion until the theoretical mass corrosion rate of steel bars reached 15%. Afterward, the MPC-CFRP was used to strengthen the corroded reinforced concrete columns and to remove the inside chlorine by electrochemistry method. The test results showed that the ultimate compressive capacity of the reinforced concrete columns strengthened by the MPC-CFRP increased by more than 22.63%. However, after ECE (current density, 3 A/m(2)), the ultimate compressive capacity of the reinforced concrete columns strengthened by MPC-CFRP reduced by 3.07% - 3.66%, and the chloride ion content at the interface between steel bar and concrete reduced by 78.52%, which postponed the corrosion of the steel bars. In addition, considering the complex nonlinear bond slip relationship between the steel bar and the concrete interface, a 3D mesoscopic finite element plastic damage model of the reinforced concrete columns strengthened by the MPC-CFRP was established. The numerical results were in good agreement with the test results, which indicated the 3D mesoscopic finite element numerical model can predict the compressive behavior of the reinforced concrete columns adequately.
关键词 ：
Axial compression behavior Axial compression behavior Electrochemical chloride extraction Electrochemical chloride extraction Numerical simulation Numerical simulation Reinforced concrete column Reinforced concrete column Reinforcement Reinforcement
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| GB/T 7714 | Li, Yue , Liu, Jianglin , Wang, Zigeng et al. Axial compression mesoscale modelling of RC columns after reinforcement-electrochemical chloride extraction [J]. | STRUCTURES , 2021 , 31 : 876-890 . |
| MLA | Li, Yue et al. "Axial compression mesoscale modelling of RC columns after reinforcement-electrochemical chloride extraction" . | STRUCTURES 31 (2021) : 876-890 . |
| APA | Li, Yue , Liu, Jianglin , Wang, Zigeng , Su, Yingqiu . Axial compression mesoscale modelling of RC columns after reinforcement-electrochemical chloride extraction . | STRUCTURES , 2021 , 31 , 876-890 . |
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摘要 ：
In this paper, the mesocalibration test was used to measure the contact parameters (restitution coefficient, rolling friction coefficient, static friction coefficient, and surface energy) between coarse aggregate particles and mortar particles in Discrete Element Method (DEM) model of concrete. Then, the DEM model of concrete slump was established according to the coarse aggregate gradation to study the flow behavior of coarse aggregate in fresh concrete. The slump test result was compared with the output of the slump DEM model with high consistent, indicating the promising reliability of the mesocalibration test. Finally, based on the mesocalibration test results, the DEM model of pumping concrete was established. It was obtained that the pumping pressure calculated by the numerical model was similar to that of the pumping test with satisfactory accuracy better than the concrete pumping pressure calculated according to the rheological test results of concrete and lubricating layer. On this basis, the movement trajectory of coarse aggregate in the pump pipe was analyzed and the influence of coarse aggregate on the pumping performance of concrete was revealed.
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| GB/T 7714 | Hao, Ji , Jin, Caiyun , Li, Yue et al. Simulation of Motion Behavior of Concrete in Pump Pipe by DEM [J]. | ADVANCES IN CIVIL ENGINEERING , 2021 , 2021 . |
| MLA | Hao, Ji et al. "Simulation of Motion Behavior of Concrete in Pump Pipe by DEM" . | ADVANCES IN CIVIL ENGINEERING 2021 (2021) . |
| APA | Hao, Ji , Jin, Caiyun , Li, Yue , Wang, Zigeng , Liu, Jianglin , Li, Hongwen . Simulation of Motion Behavior of Concrete in Pump Pipe by DEM . | ADVANCES IN CIVIL ENGINEERING , 2021 , 2021 . |
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摘要 ：
Two kinds of layered double hydroxides (LDHs), MgAl-NO2 (N-LDH) and MgAl-CO3 (C-LDH), were incorporated to study the durability of mortar and concrete. The LDH contents of mortar were 1%, 2%, and 4% by mass and the LDH contents of concrete were 0.5%, 1%, 2%, 4%, respectively. The effect of LDHs on sulfate resistance of mortar was studied through dry-wetting cycle test, compressive strength test, and flexural strength test. In addition, the effects of LDHs on pore structure, chloride resistance, carbonation resistance, shrinkage, and creep of concrete were investigated by SEM, mercury injection test, XRD, chloride ion diffusion coefficient test, chloride salt corrosion depth test, carbonation depth test, shrinkage test, and creep test. The results showed that LDHs can improve the ability of resisting ion corrosion, carbonization, shrinkage, and creep, reduce the pore content, and optimize the pore structure of mortar and concrete to some extent. Moreover, 4% LDHs had a better effect on improving the durability of mortar and concrete compared to 0.5%, 1%, and 2% LDHs, and the effect of C-LDH was better than N-LDH.
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| GB/T 7714 | Li, Zhanguo , Du, Huan , Wang, Zigeng et al. Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete [J]. | ADVANCES IN MATERIALS SCIENCE AND ENGINEERING , 2021 , 2021 . |
| MLA | Li, Zhanguo et al. "Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete" . | ADVANCES IN MATERIALS SCIENCE AND ENGINEERING 2021 (2021) . |
| APA | Li, Zhanguo , Du, Huan , Wang, Zigeng , Jin, Caiyun , Li, Yue . Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete . | ADVANCES IN MATERIALS SCIENCE AND ENGINEERING , 2021 , 2021 . |
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摘要 ：
The electrochemical accelerated corrosion of reinforced concrete (RC) columns was carried out with the target corrosion rate of longitudinal rebar as 15%, then the magnesium phosphate cement (MPC)-carbon fiber reinforced plastics (CFRP) as strengthening approach and electrochemical chloride extraction (ECE) method were integrated to process the RC columns. Among them, when the dechlorination period was 35d, the current density of dechlorination was selected as 1 A/m(2), 2 A/m(2), and 3 A/m(2); when the periods of dechlorination were 21d, 35d and 49d respectively, the dechlorination current density was set as 2 A/m(2). Finally, the seismic performance and dechlorination efficiency of RC columns under different dechlorination current densities and dechlorination periods were mainly analyzed by failure mode, hysteresis performance, lateral strength, ductility performance, stiffness degradation, residual deformation plus energy dissipation. Compared with the corroded RC columns, the cumulative energy dissipation capacity of the RC columns enhanced by MPC-CFRP promoted by 101.33% -206.36%. When the dechlorination period was 35d, the seismic performance of the RC columns dechlorided by the current density of 1 A/m(2) and 2 A/m(2) did not decrease significantly, and the seismic performance of RC columns with the dechlorination current density of 3 A/m(2) greatly reduced. When 2 A/m(2) was regarded as the dechlorination current density, the seismic performance of concrete columns with the dechlorination periods of 21d and 35d did not decrease significantly, and the seismic performance of the concrete columns with the dechlorination periods of 49d greatly reduced. However, it was worth noting that the chloride ion content of the interface between rebar and concrete abated significantly with the growth of the current density and the dechlorination period.
关键词 ：
Strengthening Strengthening Seismic performance Seismic performance Electrochemical chloride extraction Electrochemical chloride extraction MPC-CFRP MPC-CFRP RC column RC column
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| GB/T 7714 | Li, Yue , Liu, Jianglin , Wang, Zigeng et al. Investigation of seismic performance of RC column with electrochemical chloride extraction-strengthening by MPC-CFRP [J]. | ENGINEERING STRUCTURES , 2021 , 247 . |
| MLA | Li, Yue et al. "Investigation of seismic performance of RC column with electrochemical chloride extraction-strengthening by MPC-CFRP" . | ENGINEERING STRUCTURES 247 (2021) . |
| APA | Li, Yue , Liu, Jianglin , Wang, Zigeng , Jin, Caiyun , Hao, Ji , Li, Hongwen . Investigation of seismic performance of RC column with electrochemical chloride extraction-strengthening by MPC-CFRP . | ENGINEERING STRUCTURES , 2021 , 247 . |
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摘要 ：
The effect of the type and content of multi-wall carbon nanotubes (MWCNTs) on the damping performance of cement mortar is studied in this paper. The pristine MWCNTs (P-CNT) and the functionalized MWCNTs (F-CNT) grafted with COOH were used in the experiment. The content of MWCNTs was 0.05wt% and 0.1wt% of cement. The flexural/compressive strength and loss factor of CNT-mortar composites were measured. The experimental results show that MWCNTs can significantly enhance the flexural strength and loss factor, and the values increased with the increase of CNTs content. The effect F-CNT was better than P-CNT when the MWCNTs content was the same due to the presence of COOH. The mechanism of MWCNTs reinforced mortar damping performance was analyzed by a variety of micro test techniques. The test results of X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and thermogravimetry showed that MWCNTs did not change the compositions of mortar, but improved the polymerization degree of gel and the degree of hydration of cement. The results of mercury intrusion porosimetry, N-2 adsorption and backscattered scanning electron microscopy showed that MWCNTs effectively reduced the porosity and interfacial transition zone thickness of mortar. Transmission electron microscope results showed that the energy dissipation capacity of mortar is increased due to the bridging effect of MWCNTs.
关键词 ：
Damping Damping Mortar Mortar MWCNTs MWCNTs Loss factor Loss factor Mechanism analysis Mechanism analysis
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| GB/T 7714 | Li, Yue , Li, Hongwen , Jin, Caiyun . Effect of multi-walled carbon nanotubes on the damping property of cement mortar and mechanism analysis [J]. | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2021 , 21 (3) . |
| MLA | Li, Yue et al. "Effect of multi-walled carbon nanotubes on the damping property of cement mortar and mechanism analysis" . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING 21 . 3 (2021) . |
| APA | Li, Yue , Li, Hongwen , Jin, Caiyun . Effect of multi-walled carbon nanotubes on the damping property of cement mortar and mechanism analysis . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2021 , 21 (3) . |
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摘要 ：
Graphene oxide (GO)-modified magnesium phosphate cement (MPC) is used as an adhesive to bond carbon fiber-reinforced polymer (CFRP) composites in the formation of MPC-CFRP strengthening materials. The performance of GO-modified MPC paste and the mechanical performance of MPC-CFRP-strengthened concrete prisms are investigated in this paper. Workability and mechanical properties of MPC with different dosages of GO (0.035 wt% and 0.07 wt% by MgO) are tested. The results indicate that GO has negative effects on the fluidity and setting time of MPC. Mechanical properties of MPC are improved by a proper addition of GO. Compared with unstrengthened prisms, bearing capacity and stiffness of strengthened concrete prisms increase with the layers of MPC-CFRP: maximum bearing capacity increased by 372.08%, and stiffness increased by 130.15%, respectively. MPC with the optimal mechanical properties (MPC-GO1) is used as the adhesive to bond CFRP, which forms a new type of strengthening composite and greatly improves the bearing capacity and ductility of plain concrete prisms.
关键词 ：
Flexural behavior Flexural behavior Graphene oxide (GO) Graphene oxide (GO) Magnesium phosphate cement (MPC) Magnesium phosphate cement (MPC) MPC-carbon fiber reinforced plastic (MPC-CFRP) MPC-carbon fiber reinforced plastic (MPC-CFRP)
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| GB/T 7714 | Liu, Xiongfei , Li, Yue . Plain Concrete Prisms Externally Strengthened by CFRP Bonded with Graphene Oxide-Modified Magnesium Phosphate Cement [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2020 , 32 (5) . |
| MLA | Liu, Xiongfei et al. "Plain Concrete Prisms Externally Strengthened by CFRP Bonded with Graphene Oxide-Modified Magnesium Phosphate Cement" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 32 . 5 (2020) . |
| APA | Liu, Xiongfei , Li, Yue . Plain Concrete Prisms Externally Strengthened by CFRP Bonded with Graphene Oxide-Modified Magnesium Phosphate Cement . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2020 , 32 (5) . |
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摘要 ：
The effect and the interaction mechanism of functionalized multi-walled carbon nanotubes (MWCNTs) on C-S-H gel were studied in this paper. Fourier infrared spectroscopy, acid-base titration, Raman spectroscopy and transmission electron microscopy were utilized to analyze the pristine MWCNTs and functionalized MWCNTs, showing that the degree of graphitization of the functionalized MWCNTs reduced. And the surface of the functionalized MWCNTs was grafted with acidic functions which the content was 2.5 x 10(-3) mol/g. Afterward, the MWCNTs/C-S-H composite was prepared by well-dispersing the functionalized MWCNTs and the C-S-H. The experimental results showed that for the C-S-H produced with different designed molar ratios of CaO to nano-silica (C/S-D), the measured molar ratio of Ca to Si (C/S-M) of the C-S-H decreased and the interlayer spacing of the C-S-H increased with the increase of the amount of the functionalized MWCNTs. When C/S-D = 0.8, the polymerization degree of the C-S-H decreased and the proportion of the capillary pores increased gradually with increasing the amount of the functionalized MWCNTs. When the values of C/S-D were 1.5 and 2.0, the trends the polymerization degree and the proportion of the capillary pores of C-S-H were opposite to those of C/S-D = 0.8. The reasons were further analyzed based upon the above experimental results.
关键词 ：
Structure of C-S-H Structure of C-S-H Carboxylate groups Carboxylate groups Functionalized MWCNTs Functionalized MWCNTs Mechanism analysis Mechanism analysis C/S C/S
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| GB/T 7714 | Li, Yue , Li, Hongwen , Wang, Zigeng et al. Effect and mechanism analysis of functionalized multi-walled carbon nanotubes (MWCNTs) on C-S-H gel [J]. | CEMENT AND CONCRETE RESEARCH , 2020 , 128 . |
| MLA | Li, Yue et al. "Effect and mechanism analysis of functionalized multi-walled carbon nanotubes (MWCNTs) on C-S-H gel" . | CEMENT AND CONCRETE RESEARCH 128 (2020) . |
| APA | Li, Yue , Li, Hongwen , Wang, Zigeng , Jin, Caiyun . Effect and mechanism analysis of functionalized multi-walled carbon nanotubes (MWCNTs) on C-S-H gel . | CEMENT AND CONCRETE RESEARCH , 2020 , 128 . |
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