Chongchong Qi

Chongchong Qi
Central South University | CSU · School of Resources and Safety Engineering

Ph.D.

About

107
Publications
27,875
Reads
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3,797
Citations
Introduction
Chongchong Qi currently works at the School of Resources and Safety Engineering, Central South University. Chongchong does industrial waste recycling, sustainable cementitious materials, rock and soil mechanics, artificial intelligence, signal processing, and chemistry. Master students are welcome with relevant background.
Additional affiliations
October 2019 - present
Central South University
Position
  • Professor
July 2019 - July 2019
University of Transport and Technology
Position
  • Professor
July 2019 - August 2019
Inha University
Position
  • Visiting Scholar
Education
October 2016 - November 2019
University of Western Australia
Field of study
  • Civil Engineering
July 2015 - January 2016
University of Wollongong
Field of study
  • Mining Engineering
September 2012 - June 2016
China University of Mining and Technology
Field of study
  • Mining Engineering

Publications

Publications (107)
Article
Environmental issues associated with tailings management have made it the most daunting challenge faced by the mining industry. To dispose mineral tailings in a technical, environmental and economical way, the cemented paste backfill (CPB) technology is proposed and widely adopted. Here we summarize recent progress in CPB design, with particular em...
Article
Calcium aluminate cements (CACs) have attracted much attention due to their potential applications in severe environments. Up to now, their structural, electronic, and mechanical properties have not been fully determined yet. This study shed light on these properties by means of first-principles density functional theory. A total of ten phases, inc...
Article
As the main components of Portland cement, calcium silicates show substantial differences in their hydration reactivity which have not been fully explained. A comprehensive comparison of the initial hydration process of calcium silicates, namely dicalcium silicate (C2S) and tricalcium silicate (C3S), was conducted using molecular dynamics simulatio...
Article
As the main solid waste produced by coal combustion, the large accumulation of coal fly ash (CFA) causes serious environmental pollution and resource waste. Whether CFA can be recycled depends on its reactivity, which in turns can be represented by its amorphous content. This paper established random forest regression models optimized by artificial...
Article
Elucidating the mechanisms of heavy metal (HM) adsorption on clay minerals is key to solving HM pollution in soil. In this study, the adsorption of four HM atoms (As, Cd, Cr, and Hg) on the illite(001) surface was investigated using density functional theory calculations. Different adsorption configurations were investigated and the electronic prop...
Article
Large volumes of carbon dioxide are released during mining and ore resource development, and cemented paste backfill (CPB) materials are placed in the mined-out stopes where can be discharged from polluted air containing CO2. The construction of green mines and the goal of achieving carbon neutrality have become an inevitable choice for the mining...
Article
Investigating CO2 sequestration in cement-based materials is significant for achieving carbon neutrality in the cement and concrete industries. The early CO2 sequestration pathways on cement-based materials are fundamental for CO2 sequestration, which is not clear. Towards this, the adsorption behavior of CO2 on β-C2S(100) and M3-C3S(001) was inves...
Article
Full-text available
Skirted circular foundations have been widely used in offshore engineering and are subjected to combined vertical (V), horizontal (H) and moment (M) loading. Undrained load-carrying capacities of skirted circular foundations under combined V–H-M loading were derived from the finite element limit analysis (FELA) in this paper considering a wide rang...
Article
Solid ashes constitute the world's leading environmental problem and their efficient recycling requires specific origin information. Chemical signatures encode the physicochemical and structural characteristics may reveal their origins. In this study, we collected 310 solid ash samples from various continents, countries, and origins and combined pa...
Article
Full-text available
With the development of deep mining and cemented paste backfill (CPB), high stress or soft-rock mines often encounter conditions that emphasize the creep behavior of rock mass (CBRM). This paper presents numerical models to analyze the interaction between excavation and backfill of adjacent stopes while considering CBRM. Results indicated that stop...
Article
Full-text available
The application of granulated copper slag (GCS) to partially replace cement is limited due to its low pozzolanic activity. In this paper, reconstituted granulated copper slag (RGCS) was obtained by adding alumina oxide (Al2O3) to liquid copper slag. Blended cement pastes were formulated by a partial substitute for ordinary Portland cement (OPC) wit...
Article
Full-text available
Cemented paste backfill (CPB), a technology placing the solid waste into mined-out stopes in the mine through pipeline transportation, has been widespread all over the world. The resistance loss is an important parameter for pipeline transport, which is significantly affected by the slurry characteristics. However, the coupling effect of inlet velo...
Article
Full-text available
The rapid development of industry keeps increasing the demand for energy. Coal, as the main energy source, has a huge level of consumption, resulting in the continuous generation of its combustion byproduct coal fly ash (CFA). The accumulated CFA will occupy a large amount of land, but also cause serious environmental pollution and personal injury,...
Article
Granulated copper slag (GCS) is currently applied to partial cement replacement as a supplementary cementitious material (SCM), but with a low rate due to its low pozzlanic activity. In this contribution we introduce an approach to enhance the reactivity of GCS by modifying the mineral structure using calcium oxide (CaO) and aluminum oxide (Al2O3)...
Article
Full-text available
Cemented paste backfill (CPB) is the primary solution to improving the safety of continuous mining. The interaction between rock mass and backfill is an important indicator of backfill stability. The creep behavior of weak rock mass is an essential factor, which causes the evolution of stresses and displacements in the backfill stope. In this paper...
Article
Full-text available
Cement hydration is the underlying mechanism for the strength development in cement-based materials. The structural and electronic properties of calcium silicates should be elucidated to reveal their difference in hydration reactivity. Here, we comprehensively compared β-C2S and M3-C3S and investigated their structural properties and Bader charge i...
Article
Dicalcium silicate (C2S) is one of the dominating components in Portland cement and is of particular importance for the production of low energy cement. Understanding the interaction between water molecules and C2S low-index surfaces is a key step for revealing the hydration mechanism of C2S. Herein, first-principle density functional theory (DFT)...
Article
The differences in hydration between β-C2S and M3-C3S, the main phases of silicate cement, have not been fully investigated. In this study, density functional theory calculations were used to investigate the structure and bond order of β-C2S and M3-C3S before and after the molecular and dissociative adsorption of single water atoms. The unit cell o...
Article
Anionic polyacrylamide (APAM) has widely been employed in backfill mining to accelerate the sedimentation of fine tailings particles and increase the concentration of tailings slurry. However, APAM inevitably remains in thickened tailings, leading to a nonnegligible influence on the rheological, mechanical, and heavy metal leaching properties of ta...
Article
Full-text available
The accumulation of original phosphogypsum (OPG) has occupied considerable land resources, which have induced significant environmental problems worldwide. The OPG-based cemented paste backfill (OCPB) has been introduced as a promising solution. In this study, a water-washing pre-treatment was used to purify OPG, aiming to optimize the transport pe...
Article
Full-text available
River sedimentation is an important indicator for ecological and geomorphological assessments of soil erosion within any watershed region. Sediment transport in a river basin is therefore a multi-faceted field yet being a dynamic task in nature. It is characterized by high stochasticity, non-linearity, non-stationarity, and feature redundancy. Vari...
Article
Full-text available
Permeability prediction is crucial in shale gas and CO2 geological sequestration. However, the intricate pore structure complicates the prediction of permeability. Machine learning (ML) is a promising approach for predicting inherent correlations in large data sets. In this paper, a hybrid ML method is proposed to implicitly build a nonlinear relat...
Article
Full-text available
Cement-based grouting has been widely used in mining engineering; its constitutive law has not been comprehensively studied. In this study, a novel constitutive law of cement-grouted coal specimens (CGCS) was developed using hybrid machine learning (ML) algorithms. Shear tests were performed on CGCS for the analysis of stress-strain curves and the...
Article
PM2.5 is a major pollutant in the ambient air of open-pit mining, whose accurate prediction is significant for its removal and control design. In this study, a hybrid method was proposed for analyzing PM2.5 concentration. A field measurement of PM2.5 concentration was conducted at an operating open-pit mine in northern China. The data was cleaned t...
Article
To reduce the difficulty of obtaining the unconfined compressive strength (UCS) value of fiber-reinforced cemented paste backfill (CPB) and analyze the comprehensive impact of conventional and fiber variables on the compressive property, a new artificial intelligence model was proposed by combining a newly invented meta-heuristics algorithm (salp s...
Article
Full-text available
With the increasing use of the tunnel boring machine (TBM), attempts have been made to predict TBM operating parameters. Prediction of operating parameters is still an important step in the adaptability of the TBM for the future. In this study, we employ a walk forward (WF) prediction method based on ARIMAX, which can consider time-varying features...
Article
Estimation of pressure drops of fresh cemented paste backfill slurry is a novel idea with great potentials. This paper presented a hybrid machine learning (ML) method for improved pressure drops estimation using a combination of artificial neural network and differential evolution. A comprehensive parametric study was conducted on training dataset...
Article
Full-text available
Phosphogypsum (PG) is the typical by-product of phosphoric acid and phosphate fertilizers by acid digestion. The application of cemented paste backfill was feasibly investigated for the remediation of PG. The present study evaluated the fluorine immobilization mechanisms and attempted to construct a related thermodynamic and geochemical modeling to...
Article
The cemented paste backfill (CPB) technology has matured as a promising way for tailings recycling in the mining industry. Nevertheless, the current CPB design requires a large number of lab experiments to determine the unconfined compressive strength (UCS) of CPB. The utilisation of artificial intelligence (AI) prediction to reduce the lab experim...
Preprint
Phosphogypsum (PG) is the typical by-product of phosphoric acid and phosphate fertilizers by acid digestion. The application of cemented paste backfill was feasibly investigated for the remediation of PG. The present study evaluated the fluorine immobilization mechanisms and attempted to construct a related thermodynamic and geochemical modeling to...
Article
Filling mine goafs with cemented paste backfill (CPB) is an effective approach to protect the ecological environment and alleviate major safety hazards in practice. In this study, using full tailings of the Xianglushan Tungsten Mine as experimental materials, the relationship between compressive strength, hydration products, microstructure, and ele...
Article
Deep mines contain abundant geothermal energy. As a solid heat storage material, the backfill body near the surrounding rock and stope can continuously absorb heat. The phase change material (PCM) embedded in the tube-in-tube heat exchanger is more conducive to the accumulation of geothermal energy. In this paper, the backfill body with tube-in-tub...
Article
Environment-friendly disposal of coal fly ash (CFA) is essential for sustainable development and cleaner production of electricity in thermal power plants. Although CFA has been employed for soil amelioration, direct application of CFA to soil may pose risks such as heavy metal contamination. This study investigated recycling of CFA through a novel...
Article
Lithium slag (LS), a waste residue produced during the processing of lithium products, has rarely been utilized in the cement industries. The disposal of LS as solid waste causes serious land occupation and environmental pollution. This research work was performed by mixing the LS with NaOH to improve its pozzolanic activity. The blended binder (de...
Article
Full-text available
The rehabilitation of the post-mining landscape is one of the intractable bottlenecks faced by the mining industry. Though plant restoration has been regarded as an efficient way, its application is often restricted by the physicochemical properties of the soil, i.e., macronutrient deficiencies. In this work, a novel plant restoration method was pr...
Article
The disposal of cement-based construction waste and the reduction in cement consumption are two bottlenecks for the cement and concrete industry. However, these two issues can be tackled simultaneously through reactivating hydrated cement paste (HCP) to be used as new cementitious materials. Moreover, the reactivated HCP can be used together with o...
Article
Full-text available
Rapid flocculation and settlement (FS) of mine tailings is significant for the improvement and development of the filling process, whereas the settlement velocity (SV) of tailings in FS has been recognized as a key parameter to evaluate the settlement effect. However, the influence of temperature on the SV and its mechanism have not been studied. F...
Article
Full-text available
Understanding the creep behaviours of rocks is essential for the long-term stability of underground excavations in mining engineering. Creep behaviours are more important when the mining depth is greater, which leads to the emergence of weak rock masses and high in situ stresses. In this study, the creep behaviours of argillaceous sandstone (AS) we...
Article
The aim of this paper is to propose a closed-form solution to the poromechanics problem of stress and pore pressure distribution around noncircular openings at great depth subjected to hydrostatic water pressure and far-field geostresses. The problem is solved by superposing the effects of fluid and solid skeleton obtained over simple circular geom...
Article
In this paper, we develop a novel 3D computational method that describes the behaviour of rock bolts and rough rock-shotcrete interfaces as support systems. Specifically, a Finite Element model has been formulated and implemented using the user-defined element (UEL) subroutine with ABAQUS. The input parameters of the bolted cohesive model are deter...
Article
Voids (referred to as “stopes”) are generally created during underground mining activities and can lead to both local and regional geotechnical instabilities. To assist in managing the stability of mining-related voids and improving the recovery of orebodies, tailing-based backfill technology has been widely used around the world. In the design of...
Article
Lining is gaining acceptance in underground excavations because of its reinforcing and protecting capacities. The purpose of this paper was to derive an analytic expression based on the complex variable method to describe the behaviour of a tunnel with a liner of finite thickness. The stress functions have been expressed as Laurent series where the...
Article
In this study, refuse mudstone, ground granulated blast-furnace slag (GGBS) and red mud were used as the precursor materials for geopolymer. Water glass was used as the alkaline activator for polymer synthesis and standard sand was used as the aggregate in the polymer composites. A series of laboratory tests including unconfined compressive strengt...
Article
Modern mining industry thrives for energy-efficient, clean and sustainable mining processes. The cemented paste backfill (CPB) technology, which may constitute 25–30% of the total mining cost, is no exception. One of the major bottlenecks for the current CPB design is that different steps were considered separately. No integrated design frameworks...
Article
In underground mining, there has been an increasing use of “cemented paste” for the backfilling of stopes. As this cemented paste backfill (CPB) enters the stope as a fluid, shotcrete barricades are often used to retain the fill material during and after the filling operations. However, failures of barricades have been reported around the world in...
Article
Waste minimization is a major approach whereby many industries decrease environmental pollution and promote cleaner production. To achieve sustainable development, a novel idea is proposed herein to recycle magnesium slag (MS) and high-calcium fly ash (FA) into cementitious materials which are then mixed with aeolian sand (AS) to produce a type of...
Article
Full-text available
Calcium silicates are the most predominant phases in ordinary Portland cement, inside which magnesium is one of the momentous impurities. In this work, using the first-principles density functional theory (DFT), the impurity formation energy (Efor) of Mg substituting Ca was calculated. The adsorption energy (Ead) and configuration of the single wat...
Article
Coefficient of consolidation (Cv) is an important parameter in the designing of civil engineering structures founded on soil. Determination of the Cv in the laboratory is beset with complexity, therefore several attempts have been made to correlate it with the index properties of soil. In this paper, various advanced soft computing approaches namel...
Article
Permeability is an important mechanical property of low-permeable rocks, the prediction of which plays a significant role in forecasting many engineering problems like gas production and CO2 geo-sequestration. However, the ultra-low permeability and strong heterogeneity of low-permeable rocks hinder the accurate determination of permeability experi...
Article
Using multiple ensemble learning techniques for improving the predictive accuracy of landslide models is an active research area. In this study, we combined a radial basis function (RBF) neural network (RBFN) with the Random Subspace (RSS), Attribute Selected Classifier (ASC), Cascade Generalization (CG), Dagging for spatial prediction of landslide...
Article
Full-text available
The compression modulus (Es) is one of the most significant soil parameters that affects the compressive deformation of geotechnical systems, such as foundations. However, it is difficult and sometime costly to obtain this parameter in engineering practice. In this study, we aimed to develop a non-parametric ensemble artificial intelligence (AI) ap...
Article
Ice-containing cemented paste backfill (ICPB) is a novel type of backfill material that has both the advantages of traditional CPB and the underground cooling function. The pipeline transport characteristics of ICPB need to be investigated to promote its application, which are influenced by the rheological properties. The objective of this study is...
Article
Particulate matter (PM) emission is one of the leading environmental pollution issues associated with the coal mining industry. Before any control techniques can be employed, however, an accurate prediction of PM concentration is desired. Towards this end, this work aimed to provide an accurate estimation of PM concentration using a hybrid machine-...
Article
The original version of this article unfortunately contained two mistakes due to the PDF file conversion through different softwares. The presentation of Figs. 2 and 4 was incorrect. The correct versions are given below:
Article
Full-text available
Determination of shear strength of soil is very important in civil engineering for foundation design, earth and rock fill dam design, highway and airfield design, stability of slopes and cuts, and in the design of coastal structures. In this study, a novel hybrid soft computing model (RF-PSO) of random forest (RF) and particle swarm optimization (P...
Article
Full-text available
An enhanced hybrid artificial intelligence model was developed for soil temperature (ST) prediction. Among several soil characteristics, soil temperature is one of the essential elements impacting the biological, physical and chemical processes of the terrestrial ecosystem. Reliable ST prediction is significant for multiple geo-science and agricult...
Article
Cemented paste backfill (CPB) is a special composite prepared from recycled tailings, cement, and water. To ensure safe and efficient application of CPB for sulphide tailings, its pore and strength characteristics should be investigated. Although the strength of CPB has been determined well, identification of pore characteristics often requires man...
Article
The hydration of calcium silicate phases dominates the application of cement clinkers and has important practical implications. The reaction mechanisms between water and calcium silicate phases are complex and remain poorly understood at the atomic level. Herein, the single water adsorption on all low-index surfaces of β-C2S and M3-C3S was investig...
Article
The mining industry faces a number of challenges that promote the adoption of new technologies. Big data, which is driven by the accelerating progress of information and communication technology, is one of the promising technologies that can reshape the entire mining landscape. Despite numerous attempts to apply big data in the mining industry, fun...
Article
Full-text available
With the increasing threat of recurring landslides, susceptibility maps are expected to play a bigger role in promoting our understanding of future landslides and their magnitude. This study describes the development and validation of a spatially explicit deep learning (DL) neural network model for the prediction of landslide susceptibility. A geos...
Article
Full-text available
Evaporation, one of the fundamental components of the hydrology cycle, is differently influenced by various meteorological variables in different climatic regions. The accurate prediction of evaporation is essential for multiple water resources engineering applications, particularly in developing countries like Iraq where the meteorological station...
Article
Full-text available
Risk of flash floods is currently an important problem in many parts of Vietnam. In this study, we used four machine-learning methods, namely Kernel Logistic Regression (KLR), Radial Basis Function Classifier (RBFC), Multinomial Naïve Bayes (NBM), and Logistic Model Tree (LMT) to generate flash flood susceptibility maps at the minor part of Nghe An...
Article
With the continuous development of mining-with-backfill technology, more requirements are proposed for the utilized backfill materials, such as cold-loading, heat-saving, energy-storing, and seepage-proofing. In this paper, a new type of backfill material was proposed by introducing ice into cemented paste backfill (CPB), which is referred as the i...