Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber

Liu, Guoming; Cheng, Weimin; Chen, Lianjun

doi:10.1016/j.conbuildmat.2017.05.169

Cited by 119 publications

(34 citation statements)

References 29 publications

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“…This indicates that the reinforced mixture with mm fibre length and 0.35% content adheres well to the bitumen [1]. According to Liu, et al [38], short fibres (10 mm) cannot properly reinforce mixtures that have a larger size of aggregate (maximum 14 mm) while long fibres (longer than the maximum size of the aggregate) can lead to loss in mixture strength because these fibres tend to lump together during the mixing process. The results found here were similar to those found in the literature [39].…”

Section: Fibres Optimisationmentioning

confidence: 94%

Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Shanbara

Ruddock

Atherton

2018

Construction and Building Materials

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This paper describes the development of a three-dimensional (3-D), finite element model (FEM) of flexible pavements made with cold mix asphalt (CMA), which has itself been reinforced with two different natural fibres: jute and coir. A 3-D finite element model was employed to predict the viscoelastic response of flexible CMA pavements when subjected to multiple axle loads, different bituminous material properties, tire speeds and temperatures. The analysis was conducted by the finite element computer package ABAQUS/STANDARD. The pavements were subject to cyclic and static loading conditions to test for permanent deformation (rutting). The accuracy of the developed model was validated by comparing the predicted results with those measured in the lab. Reinforced and unreinforced CMA mixture models were simulated in this research. The results indicate that the CMA mixtures reinforced with natural fibres, are effective in mitigating permanent deformation (rutting). These reinforcing materials can extend the service life of flexible pavements.

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Section: Fibres Optimisationmentioning

confidence: 94%

Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Shanbara

Ruddock

Atherton

2018

Construction and Building Materials

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“…Continuous grading was performed to remove impurities before mixing the fine and coarse aggregates. e grading curves of fine and coarse aggregates are shown in Figure 4, and they conform to limitations of recommended grades in the national standard GB50086-2001 [27].…”

Section: 32mentioning

confidence: 61%

Research on Pressure Drop in the Accelerate Zone of Horizontal Conveying of Concrete Spraying

Gong

et al. 2019

Advances in Civil Engineering

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A pressure transmitter was installed at a specific position in a concrete conveying line to disclose the pressure drop when compressed air was conveyed during concrete spraying. A statistical analysis of the pressure at different positions was undertaken. Experimental results demonstrated that in the accelerate zone of horizontal conveying of concrete in the line, the pressure drop mainly occurred during the acceleration, collision, and friction processes. The momentum equation was introduced during the experiment, which interpreted the pressure drop caused by the accelerated conveying of concrete. The theoretical equation was corrected based on the results of theoretical experiments by introducing the value of α, and the experimental results were then optimized, thus obtaining an approximate model of pressure drop during the conveying of concrete. In addition, experimental results were compared with a model equation that showed the reliability of the proposed model. Research conclusions are of great significance to regulate the pressure drop in the conveying line of concretes, to design working parameters of concrete spraying devices, and to predict the ultimate distance for the conveying of concrete.

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“…Presently, with the advancement of the exploration and recovery technology, the subsurface mining operation has to deal with increasingly complicated geologic and environmental conditions. Given this situation, one not only needs to find an effective way to reinforce the surrounding rock but also needs to protect the roadway surrounding rock from weathering, airflow leakage, and self-ignition [16][17][18]. Built on the top of the conventional concrete spray methodology, there exists an urgent need to develop a fast, effective, and high-strength spray material for the postprocessing step so as to provide secondary reinforcement and protection to the anchor network.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of a Reinforcing Dust-Cementing Material for Thin Spray-On Liners in Mine Roadways

Zhou

et al. 2019

Advances in Materials Science and Engineering

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The sprayed concrete in mine roadways suffers from a prolonged exposure to the harsh environment in the underground mine, leading to its detachment which may compromise its supporting strength. Besides, the dust-cementing effect of the conventional concrete is poor, providing very limited contribution to suppress the dust-laden airflow. As such, the present experiment uses sodium carboxymethyl cellulose as the base to produce a novel thin spray material through graft copolymerization based on acrylic acid and polyaluminum chloride. This new material can not only reinforce the surrounding rock of the roadway but also cement the dust in the airflow. Infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, and SEM are employed collectively to study the microscale reaction and structure of the product. A suite of experiment testing is carried out concerning the performance of the developed spray material, which reveals the supreme mechanical strength and desired properties of the hardened film developed from the spray material.

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Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber

Cited by 119 publications

References 29 publications

Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Research on Pressure Drop in the Accelerate Zone of Horizontal Conveying of Concrete Spraying

Synthesis and Properties of a Reinforcing Dust-Cementing Material for Thin Spray-On Liners in Mine Roadways

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