Leaching and hydrating mechanisms, economic benefits of backfill materials by using coal fly ash–slag-based binder for environmentally sustainable production

Zhao, Tong; Zhang, Siqi; Yang, Huifen; Wen, Ning; Li, Jia; Zhang, Ge; Teng, Guoxiang; Li, Xuan; Guo, Song; Zhou, Yichen; Wu, Zeping

doi:10.1016/j.conbuildmat.2023.132360

Cited by 11 publications

(2 citation statements)

References 48 publications

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“…Related to this, it is noteworthy that forging 1 t manganese will cause the accumulation of 10 t silicomanganese slag [ 7 ], and fly ash belongs to the main waste of coal-fired power plants, which can produce 0.7 × 10 9 t fly ash per trillion kW·h of power supply [ 8 ]. It is estimated that the output of fly ash in China will reach 854 million tons in 2023, posing a serious threat to green ecology [ 9 , 10 ]. With the vigorous development of urbanization in Ningxia, the output of building rubble is increasing year by year, but the utilization rate is difficult to meet the standard, which seriously harms the water and soil environment [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical and Shrinkage Characteristics of a Resource-Based Cement Solid-Waste Concrete

Ning,

Jiang,

et al. 2023

Materials

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Recycling of multi-source solid waste is of great benefit to energy conservation and environmental governance. In this paper, a new type of environmental protection concrete for railway accessory facilities was prepared from silicon-manganese slag, steel slag, fly ash and recycled macadam. Seven kinds of concrete with different mix proportions were designed. Through unconfined compressive strength, splitting, drying shrinkage and temperature shrinkage tests, the multivariate changing trends of steel slag content, cement dosage and age on the anti-interference ability of concrete were investigated. The main mechanisms of the development of mechanical and dry shrinkage properties were revealed by the hydration process of 3SR-60. The results show that 3SR-60 had better mechanical strength under the same cement dosage. The temperature shrinkage strain decreased and then increased with the rise of the proportion of waste residue, increased with the addition of cement dosage and decreased first and then increased with the descent in the temperature. The temperature shrinkage coefficient reached the lowest value at 0–10 °C. The drying shrinkage coefficient decreases with the increase in the proportion of waste residue and increases with the increase in cement dosage. The dry shrinkage strain increased rapidly during the first 8 days and became almost constant after 30 days. Cementation of calcium silicate hydrate (C-S-H) and ettringite (AFt) developed continuously and filled the internal pores of the structure, interlocking and cementing with each other, which made the microstructure develop from a three-dimensional network to a dense complex, and the macro dimension was reflected in the enhancement of the power to resist external interference. The conclusion of the test summarized that SR-60 had preferable mechanical and shrinkage performance.

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Section: Introductionmentioning

confidence: 99%

Research on Mechanical and Shrinkage Characteristics of a Resource-Based Cement Solid-Waste Concrete

Ning,

Jiang,

et al. 2023

Materials

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“…By 2022, the comprehensive utilization rate of RCS was less than 12%, and the comprehensive utilization rate of industrial solid wastes was only 16% in the Ningxia Autonomous Region of China, which was not by a large difference from developed regions such as North America and Europe. The investigations demonstrated that forging 1 t of steel will form about 0.13 t of steel slag [1], making 1 t of manganese will produce about 10 t of silico-manganese slag [2,3], generating per trillion kW•h of power will emerge about 0.7 × 10 9 t fly ash [4,5]. As the principal energy development province in China, Ningxia has a critical accumulation of MSSW.…”

Section: Introductionmentioning

confidence: 99%

Investigating on the Pavement Performance of Multi-Source Solid Wastes by Cement and Fly Ash

Shan,

Li,

Zhao

et al. 2023

Materials

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In order to advance the utilization rate of multi-source solid wastes in the Ningxia region of China, 16 groups of pavement base mixtures were designed with cement and fly ash (FA) as binders, steel slag (SS), silicon manganese slag (SMS), and recycled crushed stone (RCS) as composite aggregates. The evolution laws of mechanical and frost resistance properties of the mixture were investigated by unconfined compressive strength (UCS), indirect tensile strength (ITS), freeze–thaw (FT), and ultrasonic detection tests. Then, the strength formation mechanisms were revealed by microscopic characterization technology. The mathematical models between UCS-ITS, UCS-ultrasonic amplitude, FT cycles-UCS damage, and frost resistance coefficient-relative dynamic elastic modulus Er were established. The results show that cement content and curing age exhibited a positive effect on the mechanical strength and frost resistance of the mixture. When the replacement rate of SS was 60%, the mechanical strength and frost resistance were preferable. The R2 of the strength relationship models constructed was greater than 0.9, indicating high fitting accuracy. With the extension of the curing age, the cementitious products such as C-S-H (hydrated calcium silicate) and AFt (ettringite) developed entirely, and they were interlocked and cemented with each other, resulting in the micro-morphology developed from the three-dimensional network structure to the dense system. The macroscopic behavior incarnated that the mechanical strength and frost resistance of the mixture were significantly enhanced.

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The promoting effect of Fe on the immobilization of heavy metals in MSWI FA–lead–zinc tailings-based backfill materials under field application: Dynamic simulation leaching and immobilization mechanisms

Zhao,

Yang,

Zhang

et al. 2024

Chemical Engineering Journal

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Leaching and hydrating mechanisms, economic benefits of backfill materials by using coal fly ash–slag-based binder for environmentally sustainable production

Cited by 11 publications

References 48 publications

Research on Mechanical and Shrinkage Characteristics of a Resource-Based Cement Solid-Waste Concrete

Research on Mechanical and Shrinkage Characteristics of a Resource-Based Cement Solid-Waste Concrete

Investigating on the Pavement Performance of Multi-Source Solid Wastes by Cement and Fly Ash

The promoting effect of Fe on the immobilization of heavy metals in MSWI FA–lead–zinc tailings-based backfill materials under field application: Dynamic simulation leaching and immobilization mechanisms

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