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Guoming Liu
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

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Journal article
Published: 02 June 2021 in Journal of Cleaner Production
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The problem of “industrial dust storm” will be produced in the process of preparing shotcrete. According to the characteristics of intermittence and instantaneity of dust production, the gas-solid two-phase flow theory and fluent numerical simulation software are used to optimize the process parameters in the process of shotcrete loading operation, and the simulation results are verified by the field measured data. The results reveal the influence of various factors on dust migration under the height of the breathing zone. A better combination of process parameters is optimized, and numerical simulation of the intermittent dust production under the induced airflow mechanism is carried out. The dust migration rules of the first loading and the second loading are analyzed, respectively. The dust migration rules of the secondary loading are compared and studied under different loading intervals. The dust concentration at the height of the breathing zone is analyzed emphatically, and the relevant linear equation is obtained by analysis. This study provides a theoretical basis for better control of dust concentration in the process of shotcrete loading.

ACS Style

Zhenjiao Sun; Lianjun Chen; Xin Yu; Guoming Liu; Gang Pan; Pengcheng Li; Hui Ma. Study on optimization of shotcrete loading technology and the diffusion law of intermittent dust generation. Journal of Cleaner Production 2021, 312, 127765 .

AMA Style

Zhenjiao Sun, Lianjun Chen, Xin Yu, Guoming Liu, Gang Pan, Pengcheng Li, Hui Ma. Study on optimization of shotcrete loading technology and the diffusion law of intermittent dust generation. Journal of Cleaner Production. 2021; 312 ():127765.

Chicago/Turabian Style

Zhenjiao Sun; Lianjun Chen; Xin Yu; Guoming Liu; Gang Pan; Pengcheng Li; Hui Ma. 2021. "Study on optimization of shotcrete loading technology and the diffusion law of intermittent dust generation." Journal of Cleaner Production 312, no. : 127765.

Research article
Published: 17 May 2021 in Shock and Vibration
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In order to solve the problem of poor antiimpact ability of hydraulic support under rock bursting, a kind of thin-walled cylinder crushing component used in the composite spiral antiimpact device was developed, and different structural models were proposed and simulated. On this basis, the model was verified by experiments. The results show that the arrangement of the hollow structure can restrain the ring mode deformation and Euler instability of the tube member in the crushing yield and can carry out the buckling deformation according to the expected crushing force during the compression deformation process and effectively reduce the initial peak force. The arrangement of guide grooves can make the buckling deformation more stable and regular, which can effectively reduce the initial peak force and elastic displacement. With the smaller wall thickness and the smaller wall thickness of the induced groove, the effective deformation yield stroke of the crushing member increases, and the initial peak force, total energy absorption, average reaction force, and elastic displacement decrease. The simulation results are consistent with the experimental results which will be used in the future works.

ACS Style

Cheng‐Long Wang; Yifang Chen; Qingliang Zeng; Guoming Liu. Simulation and Experiment of a Kind of Thin-Walled Tube Crushing Member Used for Antiimpact Column. Shock and Vibration 2021, 2021, 1 -12.

AMA Style

Cheng‐Long Wang, Yifang Chen, Qingliang Zeng, Guoming Liu. Simulation and Experiment of a Kind of Thin-Walled Tube Crushing Member Used for Antiimpact Column. Shock and Vibration. 2021; 2021 ():1-12.

Chicago/Turabian Style

Cheng‐Long Wang; Yifang Chen; Qingliang Zeng; Guoming Liu. 2021. "Simulation and Experiment of a Kind of Thin-Walled Tube Crushing Member Used for Antiimpact Column." Shock and Vibration 2021, no. : 1-12.

Journal article
Published: 15 April 2021 in Applied Sciences
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To study the influence of different mix proportions on the fresh properties of wet shotcrete, the rheological properties and air content of wet shotcrete with different admixtures before pumping were measured. In addition, the pressure drop along the pipeline and the build-up thickness were studied, and the relationship between the rheological properties and the pumpability and sprayability was discussed. This paper attempts to reveal the influence mechanism of admixtures on the fluidity of wet shotcrete by means of pictures. The results show that free paste effect and ball effect are two key factors that affect the performance of fresh wet shotcrete. Air-entraining agent and fly ash are commonly used admixtures, which improve the pumping performance and spraying performance. Finally, the mix proportions of wet shotcrete are put forward to meet the requirements of different types of shotcrete.

ACS Style

Jun Xie; Xiangfei Cui; Nan Guo; Guoming Liu. Influence of Mix Proportions on Rheological Properties, Air Content of Wet Shotcrete—A Case Study. Applied Sciences 2021, 11, 3550 .

AMA Style

Jun Xie, Xiangfei Cui, Nan Guo, Guoming Liu. Influence of Mix Proportions on Rheological Properties, Air Content of Wet Shotcrete—A Case Study. Applied Sciences. 2021; 11 (8):3550.

Chicago/Turabian Style

Jun Xie; Xiangfei Cui; Nan Guo; Guoming Liu. 2021. "Influence of Mix Proportions on Rheological Properties, Air Content of Wet Shotcrete—A Case Study." Applied Sciences 11, no. 8: 3550.

Research article
Published: 16 June 2020 in Advances in Materials Science and Engineering
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In order to adapt to dry and wet environment in mine roadways and improve the performance of sealing materials under different environmental conditions, this study selected the materials based on their ability to spray and found that the materials with a viscosity of 1500–6000 MPa·s can achieve a balance between performance of spray and wall-hanging performance. Next, by selecting high-elastic polyacrylate emulsion and ordinary Portland cement as the film-forming agent and gel, respectively, mix proportion factors of the nonreactive thin spray-on liner (TSL) were analyzed by using the Taguchi method. Moreover, fluidity, setting time, sealing properties, compressive strength, bending strength, and bonding strength of those materials were measured. It was disclosed that addition of an appropriate amount of polyacrylate emulsion can enhance the effects of fibers. By observing the morphologies of the materials’ bonding surfaces and comparing the factors influencing bonding strength between both dry and wet walls, it was uncovered that the adhesive property of cement-based sealing materials was mainly affected by the water-cement ratio. Eventually, bonding strength and sealing properties were selected as primary optimization indexes, while setting time, bending strength, and compressive strength were selected as secondary optimization indexes. The appropriate proportions of two types of TSLs for dry and wet walls were (W/C = 50%; P/C = 6%; F/C = 1%; T/C = 0.2%) and (W/C = 45%; P/C = 6%; F/C = 1%; T/C = 0.4%), respectively. A prepared TSL can be used for filling rock fractures in mine roadways. In addition, TSL exhibited a great performance for dry and wet walls under different environmental conditions. The present study may provide an insightful guidance and reference for the investigation of TSL sealing materials applied in the mine roadways.

ACS Style

Lianjun Chen; Xuekai Jiang; Zhaoxia Liu; Xiangfei Cui; Guoming Liu; Zhi Zhou; Qizheng Dong. Synthesis and Properties of a Polymer-Modified Material for Thin Spray-On Liners in Mine Roadways. Advances in Materials Science and Engineering 2020, 2020, 1 -19.

AMA Style

Lianjun Chen, Xuekai Jiang, Zhaoxia Liu, Xiangfei Cui, Guoming Liu, Zhi Zhou, Qizheng Dong. Synthesis and Properties of a Polymer-Modified Material for Thin Spray-On Liners in Mine Roadways. Advances in Materials Science and Engineering. 2020; 2020 ():1-19.

Chicago/Turabian Style

Lianjun Chen; Xuekai Jiang; Zhaoxia Liu; Xiangfei Cui; Guoming Liu; Zhi Zhou; Qizheng Dong. 2020. "Synthesis and Properties of a Polymer-Modified Material for Thin Spray-On Liners in Mine Roadways." Advances in Materials Science and Engineering 2020, no. : 1-19.

Journal article
Published: 27 April 2020 in Construction and Building Materials
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In order to study the dynamic mechanical properties of sprayed fiber-reinforced concrete under impact loads, a φ50mm split Hopkinson (SHPB) device was employed to perform dynamic compression experiments on sprayed plain concrete, polypropylene fiber-reinforced concrete, and plastic steel fiber-reinforced concrete. Variations in the fracture state and waveform of different sample were obtained through experimentation. The toughness, energy consumption, and strength increased with increasing of strain rate. These fibers improved the dynamic mechanical properties of shotcrete. Plastic steel fibers significantly increased the dynamic compressive strength of shotcrete, while polypropylene fibers significantly improved the toughness and energy consumption ratio. The strain rate effect and the fiber reinforcement principle were analyzed from an energy conversion perspective. A correlation analysis of the elastic strain energy change rate and the dynamic compressive strength was used to obtain a fitting curve, and showed a positive linear correlation between the two. This provides a theoretical basis for further studies on how to improve the dynamic mechanical properties of fiber-reinforced concrete from an energy conversion perspective.

ACS Style

Lianjun Chen; Xixin Zhang; Guoming Liu. Analysis of dynamic mechanical properties of sprayed fiber-reinforced concrete based on the energy conversion principle. Construction and Building Materials 2020, 254, 119167 .

AMA Style

Lianjun Chen, Xixin Zhang, Guoming Liu. Analysis of dynamic mechanical properties of sprayed fiber-reinforced concrete based on the energy conversion principle. Construction and Building Materials. 2020; 254 ():119167.

Chicago/Turabian Style

Lianjun Chen; Xixin Zhang; Guoming Liu. 2020. "Analysis of dynamic mechanical properties of sprayed fiber-reinforced concrete based on the energy conversion principle." Construction and Building Materials 254, no. : 119167.

Journal article
Published: 10 April 2020 in Construction and Building Materials
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During pumping fresh concrete pipes, aggregate migration is occurred under the action of various forces. In order to study the migration characteristic of aggregates during concrete flowing in pipes, in this paper, we built the test system based on particle tracking technology. Transparent concrete was prepared. The particle capture function of high-speed camera was used to track particle motion. Results showed that the radial displacement of particles depended on the initial location and aggregate size. Small aggregates near pipe wall or center axis had fewer motion. For the particles with larger diameter, the migration direction almost pointed to the axis of pipe. The migration displacement of nature aggregates was smaller than that of ground grinding ball. The migration displacement firstly increased and then decreased with increasing the diameter of particle. Moreover, the effect of particle shape on migration was explored. Finally, the wall effect, gravity induced particle migration and shear induced particle migration were compared based on the phenomenon of flow induced particle migration, results showed that the phenomenon of shear induced particle migration played the main role in the formation of lubrication layer. This study was of great significance to reveal the transport law of dense particle flow in the pipeline.

ACS Style

Guoming Liu; Xiaohan Guo; Weimin Cheng; Lianjun Chen; Xiangfei Cui. Investigating the migration law of aggregates during concrete flowing in pipe. Construction and Building Materials 2020, 251, 119065 .

AMA Style

Guoming Liu, Xiaohan Guo, Weimin Cheng, Lianjun Chen, Xiangfei Cui. Investigating the migration law of aggregates during concrete flowing in pipe. Construction and Building Materials. 2020; 251 ():119065.

Chicago/Turabian Style

Guoming Liu; Xiaohan Guo; Weimin Cheng; Lianjun Chen; Xiangfei Cui. 2020. "Investigating the migration law of aggregates during concrete flowing in pipe." Construction and Building Materials 251, no. : 119065.

Research article
Published: 05 February 2020 in Advances in Mechanical Engineering
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In order to comprehensively investigate the influence of the thickness of thin spray-on liners on their adhesive strength with different surrounding rock environments, pull-off tests were employed to measure the adhesive strength of thin spray-on liners of different thickness on the surface of various substrates (granite, sandstone, concrete, and coal), which were used to simulate different surrounding rock environments. The results indicated that the failure mode was mainly liner material–substrate adhesion failure when granite, sandstone, or concrete was used as the substrate, while substrate failure was observed to occur more frequently when coal was used as the substrate. The variation rules of the adhesive strength ( σ) of thin spray-on liners, along with liner thickness ( t), for different surrounding rock environments were obtained: [Formula: see text] for granite, [Formula: see text] for sandstone, [Formula: see text] for concrete, and [Formula: see text] ( t < 4) and [Formula: see text] ( t≥4) for coal. Furthermore, analysis of the standard deviation of experimental adhesive-strength data suggested that the variation in adhesive strength decreased in the following sequence: coal > concrete > sandstone > granite. The achievements of the current study provide a theoretical basis for the on-site determination of thin spray-on liner thickness requirements, as well as the scientific and rational design of liner material structure.

ACS Style

Lianjun Chen; Zhi Zhou; Guoming Liu; Xiangfei Cui; Qizheng Dong; Huaixuan Cao. Effects of substrate materials and liner thickness on the adhesive strength of the novel thin spray-on liner. Advances in Mechanical Engineering 2020, 12, 1 .

AMA Style

Lianjun Chen, Zhi Zhou, Guoming Liu, Xiangfei Cui, Qizheng Dong, Huaixuan Cao. Effects of substrate materials and liner thickness on the adhesive strength of the novel thin spray-on liner. Advances in Mechanical Engineering. 2020; 12 (2):1.

Chicago/Turabian Style

Lianjun Chen; Zhi Zhou; Guoming Liu; Xiangfei Cui; Qizheng Dong; Huaixuan Cao. 2020. "Effects of substrate materials and liner thickness on the adhesive strength of the novel thin spray-on liner." Advances in Mechanical Engineering 12, no. 2: 1.

Review article
Published: 28 January 2020 in Construction and Building Materials
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In the last decades, significant advances have been made to investigate the rheology of fresh concrete. It was generally accepted that rheology plays a key role in the estimation of concrete workability. However, the application of rheology on shotcrete is relatively few. Thus, this paper tries to make a link between the rheology and shotcrete application. In the first part, various rheology models of fresh concrete were summarized. The characteristics and application scope of rheological models are discussed. In a second part, methods allowing for the measurement of the yield stress and plastic viscosity with or without the use of a rheometer were described, along with the corresponding transformation equations. The methods of avoiding imprecise translation were put forward. In the third part, the relationship between rheology and shotcrete was analyzed, which could be considered as practical tools allowing for the prediction of pumpability and shootability of fresh concrete.

ACS Style

Guoming Liu; Weimin Cheng; Lianjun Chen; Gang Pan; Zhaoxia Liu. Rheological properties of fresh concrete and its application on shotcrete. Construction and Building Materials 2020, 243, 118180 .

AMA Style

Guoming Liu, Weimin Cheng, Lianjun Chen, Gang Pan, Zhaoxia Liu. Rheological properties of fresh concrete and its application on shotcrete. Construction and Building Materials. 2020; 243 ():118180.

Chicago/Turabian Style

Guoming Liu; Weimin Cheng; Lianjun Chen; Gang Pan; Zhaoxia Liu. 2020. "Rheological properties of fresh concrete and its application on shotcrete." Construction and Building Materials 243, no. : 118180.

Research article
Published: 28 November 2019 in Advances in Civil Engineering
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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

ACS Style

Xiangfei Cui; Guoming Liu; Cheng-Long Wang; Yudong Qi. Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet-Mix Shotcrete. Advances in Civil Engineering 2019, 2019, 1 -14.

AMA Style

Xiangfei Cui, Guoming Liu, Cheng-Long Wang, Yudong Qi. Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet-Mix Shotcrete. Advances in Civil Engineering. 2019; 2019 ():1-14.

Chicago/Turabian Style

Xiangfei Cui; Guoming Liu; Cheng-Long Wang; Yudong Qi. 2019. "Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet-Mix Shotcrete." Advances in Civil Engineering 2019, no. : 1-14.

Journal article
Published: 23 July 2019 in Construction and Building Materials
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Wet-mix shotcrete mainly includes two processes: pumping and spraying. In this study, to explore the effects of the pumping and spraying processes on the rheological properties and air content of concrete, a full-scale experimental system of wet-mix shotcrete was developed with the given work parameters of these processes. The rheological parameters, slump, and air content of the fresh concrete were measured before pumping, after pumping, and after spraying, respectively. In general, the air content decreased after pumping, whereas the flow resistance declined after pumping and then increased after spraying. These changes were linked to the shear and shock caused by the pumping or spraying process. Under the interference of the pumping and spraying processes, prediction models of the changes in concrete properties were developed. Finally, a one-way analysis of variance (ANOVA) was conducted to analyze the degree of influence of the pumping and spraying processes on concrete properties. This work could be beneficial for further improvement of the understanding of the overall wet-mix shotcrete material and processes.

ACS Style

Lianjun Chen; Guanguo Ma; Guoming Liu; Zhaoxia Liu. Effect of pumping and spraying processes on the rheological properties and air content of wet-mix shotcrete with various admixtures. Construction and Building Materials 2019, 225, 311 -323.

AMA Style

Lianjun Chen, Guanguo Ma, Guoming Liu, Zhaoxia Liu. Effect of pumping and spraying processes on the rheological properties and air content of wet-mix shotcrete with various admixtures. Construction and Building Materials. 2019; 225 ():311-323.

Chicago/Turabian Style

Lianjun Chen; Guanguo Ma; Guoming Liu; Zhaoxia Liu. 2019. "Effect of pumping and spraying processes on the rheological properties and air content of wet-mix shotcrete with various admixtures." Construction and Building Materials 225, no. : 311-323.

Research article
Published: 03 March 2019 in Advances in Civil Engineering
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In order to reduce the dust hazard of shotcrete, the paper analyzed the mechanism of dust production from the perspective of various dust sources and developed the plunger-type wet spraying machinery and wet mixer which can be applied in the small-section tunnel for reducing dust on the root cause. The dust concentration between dry-mix shotcrete and wet-mix shotcrete was compared and analyzed. The results showed that the average total dust concentration and respirable dust concentration in the process of dry spraying were 99.4 mg/m3 and 52 mg/m3, respectively, while 9.8 mg/m3 and 4.08 mg/m3 in the wet-mix shotcrete process, and the average dust concentration decreased by more than 90% after applying new wet-mix shotcrete outfits. The clean zone of dust was divided according to the dust distribution. Finally, the dust suppression technology was optimized by using an accelerator and adjusting wind pressure and spraying angle. Results indicated that the application of the accelerator reduced the dust production efficiently; moreover, when the wind pressure was 0.2 MPa with 1 m spraying distance and 90° angle of spraying, the dust concentration and rebound reached the minimum.

ACS Style

Pengcheng Li; Zhi Zhou; Lianjun Chen; Guoming Liu; Wei Xiao. Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization. Advances in Civil Engineering 2019, 2019, 1 -11.

AMA Style

Pengcheng Li, Zhi Zhou, Lianjun Chen, Guoming Liu, Wei Xiao. Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization. Advances in Civil Engineering. 2019; 2019 ():1-11.

Chicago/Turabian Style

Pengcheng Li; Zhi Zhou; Lianjun Chen; Guoming Liu; Wei Xiao. 2019. "Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization." Advances in Civil Engineering 2019, no. : 1-11.

Research article civil engineering
Published: 08 December 2018 in Arabian Journal for Science and Engineering
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The simultaneous operations of drilling (cutting rock) and shotcreting are occasionally carried out in order to advance the tunneling speed in underground roadways. Under these circumstances, the dust pollution from multiple dust sources is serious, especially threatening worker health. In this paper, the main dust sources were divided; a new ventilation system under the simultaneous operations was proposed by adding one turbulator (T) and the second exhaust air outlet (SEAO). The airflow-dust migration law after improving ventilation system was analyzed to determine the optimum combination and corresponding working parameters of T and SEAO based on computational fluid dynamics. Results showed that the combinatorial arrangements of A-3 pattern, T installed upstream while SEAO laid downstream of shotcreting area, were the best ventilation pattern in terms of dust suppression. The more air volume from SEAO is, the smaller the diffusion distance of high concentration dust is. The dust concentration at the interface between cutting rock and shotcrete declined and then increased with increasing total forced air volume. The bigger the forced-exhaust air ratio is, the larger the dust concentration at interface is. According to the on-site test, the new method prevented the high concentration dust from diffusing at tunneling district and reduces the dust concentration at shotcreting district.

ACS Style

Lianjun Chen; Guoming Liu. Airflow-Dust Migration Law and Control Technology Under the Simultaneous Operations of Shotcreting and Drilling in Roadways. Arabian Journal for Science and Engineering 2018, 44, 4961 -4969.

AMA Style

Lianjun Chen, Guoming Liu. Airflow-Dust Migration Law and Control Technology Under the Simultaneous Operations of Shotcreting and Drilling in Roadways. Arabian Journal for Science and Engineering. 2018; 44 (5):4961-4969.

Chicago/Turabian Style

Lianjun Chen; Guoming Liu. 2018. "Airflow-Dust Migration Law and Control Technology Under the Simultaneous Operations of Shotcreting and Drilling in Roadways." Arabian Journal for Science and Engineering 44, no. 5: 4961-4969.

Review
Published: 03 July 2018 in Journal of Loss Prevention in the Process Industries
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The shotcrete has become a major technique in the support construction of underground mine. Unfortunately, enormous amounts of cement dust may be produced during shotcrete because of deficient mixing of materials and high jet speed. At present, in term of dust suppression, the dust generated from shotcrete is easily ignored when compared with the rock or mine dust in mine exploitation. The paper summarizes the development of cement dust suppression technology during shotcrete. The component and pathological damage of cement dust was analysed. The diffusion of shotcrete dust was uncovered as well as alkaline particle distribution. Efforts to control and reduce the shotcrete dust were done, including developing new shotcrete machines, optimizing process and using new material technology and so on. Finally, challenges of shotcrete proposed in special roadway environment of China’ mine still exist and further efforts need to be made.

ACS Style

Lianjun Chen; Pengcheng Li; Guoming Liu; Weimin Cheng; Zhaoxia Liu. Development of cement dust suppression technology during shotcrete in mine of China-A review. Journal of Loss Prevention in the Process Industries 2018, 55, 232 -242.

AMA Style

Lianjun Chen, Pengcheng Li, Guoming Liu, Weimin Cheng, Zhaoxia Liu. Development of cement dust suppression technology during shotcrete in mine of China-A review. Journal of Loss Prevention in the Process Industries. 2018; 55 ():232-242.

Chicago/Turabian Style

Lianjun Chen; Pengcheng Li; Guoming Liu; Weimin Cheng; Zhaoxia Liu. 2018. "Development of cement dust suppression technology during shotcrete in mine of China-A review." Journal of Loss Prevention in the Process Industries 55, no. : 232-242.

Journal article
Published: 01 September 2017 in Construction and Building Materials
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ACS Style

Guoming Liu; Weimin Cheng; Lianjun Chen. Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber. Construction and Building Materials 2017, 150, 14 -23.

AMA Style

Guoming Liu, Weimin Cheng, Lianjun Chen. Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber. Construction and Building Materials. 2017; 150 ():14-23.

Chicago/Turabian Style

Guoming Liu; Weimin Cheng; Lianjun Chen. 2017. "Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber." Construction and Building Materials 150, no. : 14-23.

Journal article
Published: 31 March 2017 in Applied Sciences
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In the rapidly developing modern society, many raw materials, such as crushed limestone and river sand, which are limited, are consumed by the concrete industry. Naturally, the usage of waste materials in concrete have become an interesting research area in recent years, which is used to reduce the negative influence of concrete on the environment. Hence, this paper presents the development of a sustainable lightweight wet-mix shotcrete by replacing natural coarse gravel with a kind of byproduct, nut shell (walnut). Fibers made from dumped polyethylene terephthalate (PET) bottles were mixed in the composite to improve the properties of the lightweight wet-mix shotcrete. The initial evaluation of the fresh concrete mixed with different volume fraction of walnut shell was carried out in terms of its performance capacities of mechanical properties (i.e., tensile and compressive strength), pumpability and shootability (i.e., slump, pressure drop per meter and rebound rate) and the results were compared with plain concrete. With increase of walnut shell, compressive and splitting tensile strength of casting concrete decreased, while slump and pressure drop reduced slightly. Additionally, appropriate dosage of walnut shell can improve the shootability of fresh concrete with low rebound rate and larger build-up thickness. In the second series tests, polypropylene (PP) fiber and multi-dimension fiber were also mixed in composite for comparative analysis. After mixing fibers, the splitting tensile strength had obtained marked improvement with slight reduction of compressive strength, along with acceptable fluctuation in terms of pumpability and shootability. Furthermore, relation of density and compressive strength, relation of rebound and density, build-up thickness and relation of compressive and splitting tensile strength were discussed. This study found wet-mix shotcrete incorporating PET fiber with walnut shell of about 35% coarse aggregate replacement could be used for roadway support as lightweight shotcrete per requirements of mine support.

ACS Style

Weimin Cheng; Guoming Liu; Lianjun Chen. Pet Fiber Reinforced Wet-Mix Shotcrete with Walnut Shell as Replaced Aggregate. Applied Sciences 2017, 7, 345 .

AMA Style

Weimin Cheng, Guoming Liu, Lianjun Chen. Pet Fiber Reinforced Wet-Mix Shotcrete with Walnut Shell as Replaced Aggregate. Applied Sciences. 2017; 7 (4):345.

Chicago/Turabian Style

Weimin Cheng; Guoming Liu; Lianjun Chen. 2017. "Pet Fiber Reinforced Wet-Mix Shotcrete with Walnut Shell as Replaced Aggregate." Applied Sciences 7, no. 4: 345.

Research article
Published: 05 March 2017 in Advances in Materials Science and Engineering
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Wet-mix shotcrete has lower water content even though looking wet which is generally less than 8% of total content. The inner surface of pipes will absorb water from fresh concrete to wet itself if concrete pump primers is not pumped early; meanwhile, the saturated concrete is transformed into the unsaturated concrete, and pipe blockage often occurs. In order to minimize the loss of water and wet pipes, a new type of pump primers was developed to precreate the lubricating layer that is one of the most dominant factors in determining the pumping capability, which would provide a cost-effective replacement for premium priced cement-based primers. Experiments were conducted to measure the viscosity, stability, and strength of mix solution during development stage. The optimal formula was obtained by orthogonal matching tests with 0.5% sodium stearate, 0.75% xanthan gum, 0.3% polyacrylamide, and 0.4% blender (mass ratio related to mix water). The pressure drop reduction of new primers was larger than that of common primers.

ACS Style

Guoming Liu; Lianjun Chen; Weimin Cheng; Yanan Huang. Research on Pump Primers for Friction Reduction of Wet-Mix Shotcrete Based on Precreating Lubricating Layer. Advances in Materials Science and Engineering 2017, 2017, 1 -12.

AMA Style

Guoming Liu, Lianjun Chen, Weimin Cheng, Yanan Huang. Research on Pump Primers for Friction Reduction of Wet-Mix Shotcrete Based on Precreating Lubricating Layer. Advances in Materials Science and Engineering. 2017; 2017 ():1-12.

Chicago/Turabian Style

Guoming Liu; Lianjun Chen; Weimin Cheng; Yanan Huang. 2017. "Research on Pump Primers for Friction Reduction of Wet-Mix Shotcrete Based on Precreating Lubricating Layer." Advances in Materials Science and Engineering 2017, no. : 1-12.

Research article
Published: 30 August 2016 in Advances in Materials Science and Engineering
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Air entraining agent (AEA) can bring a lot of microbubbles into fresh concrete for improving its fluidity; however, high fluidity has adverse effect on the shootability of wet-mix shotcrete. In order to solve the contradictory issue, the paper developed a new type of green switch air entraining agent (GSAE) that can improve both the pumpability and shootability. The single-admixture and combination tests containing foaming ability and surface tension were performed with Deer agitator and automatic tension meter. The new AEA was developed with two constituents A and B. A was prepared withSapindus mukorossi(S-1), dodecyl trimethyl ammonium chloride(1231), and polyacrylamide. B was prepared with lauryl sodium sulfate (K12) and silicone oil. The mass mix proportion was S-1 : 1231 : polyacrylamide : K12 : silicone oil = 1 : 0.33 : 0.2 : 0.33 : 0.47. The application method of GSAE proposed that A was premixed with fresh concrete and then B was added at nozzle. Experimental investigation showed that the optimal mixing amount of GSAE was 0.1%–0.2% relative to cement. All performance measured of wet-mix shotcrete with 0.12% GSAE met the first-grade product requirements of the China National Standard. Compared with the conventional type of AEA, the proposed GSAE is capable of effectively improving pumpability and shootability.

ACS Style

Guoming Liu; Lianjun Chen. Development of a New Type of Green Switch Air Entraining Agent for Wet-Mix Shotcrete and Its Engineering Application. Advances in Materials Science and Engineering 2016, 2016, 1 -9.

AMA Style

Guoming Liu, Lianjun Chen. Development of a New Type of Green Switch Air Entraining Agent for Wet-Mix Shotcrete and Its Engineering Application. Advances in Materials Science and Engineering. 2016; 2016 ():1-9.

Chicago/Turabian Style

Guoming Liu; Lianjun Chen. 2016. "Development of a New Type of Green Switch Air Entraining Agent for Wet-Mix Shotcrete and Its Engineering Application." Advances in Materials Science and Engineering 2016, no. : 1-9.

Journal article
Published: 30 June 2016 in SpringerPlus
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Wet shotcrete can reduce dust and improve supporting strength, however, safe and efficient pipage is a key technical part of wet shotcrete process. The paper studied the pipe flow law of wet shotcrete based on lubrication layer by build the experimental pumping circuit of wet shotcrete that can carry out a number of full-scale pumping tests. The experimental results show there was a linear relationship between pressure loss and flow rate. Combined with the Buckingham rheological equation, the computing equations of the yield shear stress and plastic viscosity were deduced through linear regression. A simple analytical method allowing for a rough estimation of the pumping pressure was proposed and used when considering the lubrication layer of wet shotcrete in pipes. In addition, two kinds of particulate distributive models were established along the time axial to analyze the formation of lubrication layer which is related with particles migration. By computational fluid dynamics simulation, the lubrication layer thickness of different mix proportions was estimated. A new method for measuring the thickness of lubrication layer was proposed to verify it by binarization processing. Finally, according to the comparative analysis of experiments, simulation and computed value, it can be seen that the lubrication layer plays a key role in the process of wet shotcrete flow and with the increase of lubrication layer thickness pipe pressure declines gradually.

ACS Style

Lianjun Chen; Guoming Liu; Weimin Cheng; Gang Pan. Pipe flow of pumping wet shotcrete based on lubrication layer. SpringerPlus 2016, 5, 945 .

AMA Style

Lianjun Chen, Guoming Liu, Weimin Cheng, Gang Pan. Pipe flow of pumping wet shotcrete based on lubrication layer. SpringerPlus. 2016; 5 (1):945.

Chicago/Turabian Style

Lianjun Chen; Guoming Liu; Weimin Cheng; Gang Pan. 2016. "Pipe flow of pumping wet shotcrete based on lubrication layer." SpringerPlus 5, no. 1: 945.