Rheology control of self-consolidating cement-tailings grout for the feasible use in coal gangue-filled backfill

Jin, Jiaxu; Qin, Zhifa; Lü, Xilin; Liu, Tao; Zhang, Guosen; Shi, Jinyan; Zuo, Shenghao; Li, Daiqi

doi:10.1016/j.conbuildmat.2021.125836

Cited by 52 publications

(24 citation statements)

References 35 publications

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“…The particle size distributions of RS, SP, and OPC are shown in figure 1, respectively. The PCE produced by Nanchang Science and Technology Co., Ltd was used as a chemical admixture to improve workability and maintain the rheology of fresh self-compacting mortar (SCM) mixes in this study solid content of 20% and water reduction rate of25% [21,25]. The POF of different diameters (0.5 mm, 1 mm) and different volume incorporation ratios (2%, 3%, 3.5%, 4%, 5%) were used to prepare the TLAC samples [3,8,26].…”

Section: Methodsmentioning

confidence: 99%

“…To get rid of this problem, self-compacting concrete is the best solution for TC fabrication with good homogeneity. Consequently, much attention is paid to the freshness and hardening properties of self-compacting concrete in order to make it cleaner and more sustainable, either by replacing fine aggregates with industrial by-products or by adding steel or polymeric fibers [3,20,21].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical, light transmittance properties and simulation study of sustainable translucent lightweight aggregate concrete

Lian¹,

Yin²

2022

Mater. Res. Express

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To investigate the engineering feasibility of translucent lightweight aggregate concrete (TLAC) in sustainable buildings, this paper focuses on testing the light transmission properties and mechanical performance of TLACs, the light transmission effect in building interiors is simulated and evaluated using automated steps seamlessly integrated with REVIT software and Radiance software. The preparation process of TLACs and the mixture proportions of raw materials were designed by combining translucent concrete technology with self-compacting mortar. The results indicate that the light transmission of TLAC increases with the volume of polymethylmethacrylate optical fiber (POF) incorporated and the diameter of POF, while the compressive strength tends to increase first and then decrease with the increasing volume fraction of POF in the TLAC samples. Moreover, the building lighting simulations show that indoor illuminance will improve significantly with the use of TLACs, which further illustrates the energy savings and structural performance improvements owing to the application of TLAC as a modern construction material.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical, light transmittance properties and simulation study of sustainable translucent lightweight aggregate concrete

Lian¹,

Yin²

2022

Mater. Res. Express

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“…After sieving, CGs with a continuous grading ranging from 5 to 25 mm were employed. The details of CG have been reported in [36]. Among them, the material properties, manufacturing processes and strength grades selected in this paper are all different.…”

Section: Methodsmentioning

confidence: 99%

Development of Backfill Concrete Including Coal Gangue and Metakaolin and Prediction of Compressive Strength by Extreme Learning Machine

Jin

Yuan

et al. 2022

Minerals

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The main aim of this investigation is to develop backfill concrete including coal gangue and metakaolin to reduce solid waste. For this purpose, a total of 30 concrete mixtures were designed by the inclusion of 0%, 25%, 50%, 75% and 100% coal gangue as coarse aggregates and 0%, 10% and 20% metakaolin as binder at 0.55 and 0.45 water to cement ratios. The compressive strength was tested after 3, 7 and 28 days for a total of 90 samples. Meanwhile, the influences of coal gangue and metakaolin on the elastic modulus, ultrasonic pulse velocity, rebound number and open porosity were explored. Then, the relationship between physical and mechanical properties was revealed by design code expressions and empirical models. Furthermore, an extreme learning machine was developed to predict compressive strength by concrete mixtures. The results show that the inclusion of coal gangue results in a poor performance in physical and mechanical properties of concrete. However, the drawbacks of concrete containing coal gangue can be compensated by metakaolin. The predicted results of design code expressions and empirical models are closed to the experiment results, with a 10% error. In addition, the findings reveal that the extreme learning machine offers significant potential to predict the compressive strength of concrete with high precision.

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“…IOT, RM, and oyster shells, as bulk solid wastes, have a serious negative impact on the ecological environment. As of 2013, China’s IOT output was 5 billion tons, but the utilization rate was less than 20%, and China was the fourth largest alumina producer in the world, emitting tens of millions of tons of RM every year [ 1 , 2 ]. Moreover, as of 2019, the annual output of oyster shells reached 5.23 million tons [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

Sun

2022

Materials

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The use of bulk solid-waste iron tailing (IOT), red mud (RM), and oyster shells to prepare cemented paste backfill (CPB) can effectively solve the ecological problems caused by industrial solid waste storage and improve the utilization rate of such materials. In this study, a new type of CPB was prepared by partially replacing slag with RM, with calcined oyster shell (COS) as the alkaline activator and IOT as aggregate. The central composite design (CCD) method was used to design experiments to predict the effects of the COS dosage, RM substitution rate, solid mass, and aggregate–binder ratio using 28-dUCS, slump, and the cost of CPB. In this way, a regression model was established. The quantum genetic algorithm (QGA) was used to optimize the regression model, and X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS) microscopic tests are performed on CPB samples of different ages with the optimal mix ratio. The results showed that COS is a highly active alkaline substance that provides an alkaline environment for polymerization reactions. In the alkaline medium, the hematite and goethite in RM and quartz in IOT gradually dissolved and participated in the process of polymerization. The main polymerization products of the CPB samples are calcium–silicate–hydrogel (C–S–H), calcium–aluminosilicate–hydrogel (C–A–S–H), and aluminosilicate crystals such as quartz, albite, and foshagite. These products are intertwined and filled in the internal pores of the CPB, enabling the pore contents to decrease and the interiors of the CPB samples to gradually connect into a whole. In this way, the compressive strength is increased.

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Rheology control of self-consolidating cement-tailings grout for the feasible use in coal gangue-filled backfill

Cited by 52 publications

References 35 publications

Mechanical, light transmittance properties and simulation study of sustainable translucent lightweight aggregate concrete

Mechanical, light transmittance properties and simulation study of sustainable translucent lightweight aggregate concrete

Development of Backfill Concrete Including Coal Gangue and Metakaolin and Prediction of Compressive Strength by Extreme Learning Machine

Preparation and Strength Formation Mechanism of Calcined Oyster Shell, Red Mud, Slag, and Iron Tailing Composite Cemented Paste Backfill

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