Chao-qiang Wang’s research while affiliated with Chongqing Jiaotong University and other places

... [8][9][10] Utilizing inorganic cementitious materials, such as cement, for the solidification/stabilization of toxic waste can form a strong cementitious matrix through chemical binding or physical adsorption by hydration products. [11][12][13][14][15][16] The physical binding involves encapsulating or adsorbing waste residue within the cementitious material, while the chemical binding solidifies through bonding resulting from ion exchange with the gel substance. [11][12][13][14] This alteration in the waste's fluidity, compressibility, and strength reduces the leaching of toxic components. ...

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Immobilization of arsenic wastes and retardation effect on cement hydration: Experimental and molecular dynamic analysis

... For building rubbish, landfill and open-pile treatment have caused ecological damage. The development of new types of buildings has also led to the overuse of natural materials [3,4]. Thus, improving the use of solid waste and promoting the green treatment of construction waste are key issues in construction [5,6]. ...

Reference:

Evaluation on Preparation and Performance of a Low-Carbon Alkali-Activated Recycled Concrete under Different Cementitious Material Systems

... By 2020, the cumulative amount of CG in the country has exceeded 6 billion tons (Shuai et al., 2022). The massive accumulation of coal-based solid waste causes continuous pollution and damage to the surrounding environment, water, and soil (Wang and Cheng, 2024). At present, FA, GS, and CG are mainly used in construction building materials, roadbed construction, etc. . ...

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Study on the synergistic preparation of functional soil from multiple coal-based solid wastes

... concrete or mortar can increase the structural strength of the bricks, making them suitable for load-bearing walls and other applications that require enhanced durability. Moreover, having holes that serve as a beneficial tool in the process of creating bricks and provide a potential place to join them using phosphogypsum as mortar or glue [26]. These voids, in addition to reducing the weight of the bricks, making them easier to handle and transport, also offer an effective method to lower construction costs. ...

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Compressive performance of non-fired phosphogypsum bricks for reducing environmental pollution

... To ensure the best pore structure during mixing, it is recommended to adopt a mixing process that involves slow, then fast, and then slow mixing. Before pouring the actual foam concrete, it is necessary to conduct a test specimen test to evaluate the pouring quality [21]. The cutting of PVC pipes was performed at heights of 500, 1,000, 1,500, and 2,000 mm using a cutting machine. ...

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A Comparative Analysis of Traditional and New Construction Methods for External Wall Insulation in Jiangning, Nanjing, China

... Currently, numerous domestic studies have found that coal gangue has a certain effect on removing some conventional pollutants, heavy metals, and organic substances [166,167]. Coal gangue's liquid permeability can meet regulatory requirements, and it has significant adsorption capacity for heavy metals such as lead and zinc [168]. By loading layered double hydroxides (LDH) on the inner pore walls of coal gangue's "ball window" porous monoliths (CBPM) to construct its framework, this structure displays a large specific surface area and abundant binding sites, making it especially suitable for removing trace emulsified water from contaminated oil, particularly as a flow-through filtration unit [169]. ...

Reference:

Coal Gangue Utilization: Applications, Challenges, and Sustainable Development Strategies

... Zhang et al. [24,25] developed lightweight cement composites with the incorporation of fly ash and waste soil, exhibiting better sustainability performance, however, these were related to lightweight composites. Wang et al. [22,23] investigated environmental performances of fly ash plastering mortar and found that it had effectively contained heavy metals and reduced carbon,this only involved the plastering mortar. Bhowmik et al. studied the physical, mechanical, and tribological behavior of an Al7075-fly ash composite for the improvement of lightweight applications; however, it was limited to Al7075 composites. ...

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Application of Advanced Data Fusion and Hybrid Machine Learning Techniques for Strength Prediction and Optimization of Fly-Ash Based Sustainable Concrete

... This adhered mortar is characterized by being rough and porous, causing the RCA to have a greater interfacial transition zone (ITZ) and absorption if compared to a natural aggregate (NA). This will eventually cause different or reduced benefits [18]. Currently, two treatment methods have been prescribed to improve RCA with these characteristics, seeking to reduce the amount of adhered mortar through different procedures such as mechanical treatments or the use of acid [19]. ...

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Permeable Concrete with Recycled Aggregates. Study of Its Mechanical and Microstructural Properties

... The tailings' surface contains active heavy metal ions. In addition to being used for particle refinement, the mechanical energy applied by crushing is also stored in the particle to "weak solidification", and the research on the solidification ability of the low strength of CTB has not been carried out [28,29]. ...

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Study on the Long-Term Durability and Leaching Characteristics of Low-Consumption Cement Backfill under Different Environmental Conditions

... Constant b 1 represents the rate of diffusion of heavy metals from the solid phase to the liquid phase. A higher value of b 1 indicates a faster diffusion rate [44,45]. ...

Reference:

Evaluation of Leaching Characteristics of Heavy Metal Ions from Red Mud–Graphite Tailings