Study on Road Performance of Cement Fly Ash Stabilized Steel Slag—Concrete Recycled Macadam

Li, Hongbo; Tong, Yang; Zhang, Hubiao; Zhang, Xuanshuo; Duan, Junku

doi:10.3390/ma14247530

Cited by 11 publications

(13 citation statements)

References 42 publications

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“…When the amount of fly ash is extremely large, the compactness of the slurry is inadequate, owing to its low activity and its inability to fully hydrate into gel, thereby reducing the self-compacting concrete. With the secondary hydration of the fly ash, a large amount of Ca(OH) 2 is consumed, greatly reducing the compactness of the test pieces [ 36 , 37 , 38 ]. The thickness of the damaged layer increases with the decrease in temperature because the free water in the test piece moves continuously and forcefully in the direction of the high temperature.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment

Zhang

Yang

2022

Materials

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To study the influence of mineral admixtures on concrete’s mechanical properties after a low-temperature exposure, green concrete was prepared by mixing fly ash and slag at different replacement rates. By analysing the changes to concrete’s mechanical properties and the damage layer thickness under different ambient temperatures (20, −10, −20, −30, and −40 °C), the change rule of concrete at low temperatures was explored. The results revealed that the compressive strength of concrete, containing either fly ash or slag, peaked at 30 °C; moreover, the slag concrete’s flexural and splitting tensile strength peaked at −40 °C. The best mechanical properties were observed for a fly ash-to-slag ratio of 1:2 (F10S20; i.e., 10% fly ash and 20% slag) and its compressive strength at different temperatures was higher than that of concrete, containing 30% fly ash (F30) or 30% slag (S30), but the flexural and splitting tensile strength was lower than S30. Further, as the temperature decreased, the fly ash concrete’s damaged layer thickness gradually increased. When the content of fly ash and slag were both 15% (F15S15), the damaged layer thickness was minimal at different low temperatures, especially at −30 °C, where the thickness was only 8.31 mm.

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Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment

Zhang

Yang

2022

Materials

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“…Crushing, screening, magnetic sorting, and removal of light materials [9,10] Modified by adding lime, cement, fly ash, silica fume, blast furnace slag, steel slag, rice husk ash, etc. [22][23][24][25][26][27] Reuse as concrete, brick, and ceramic Heating and compressing [28][29][30] Converted to materials such as natural gas and fertilizer Thermochemical treatment or anaerobic digestion [6][7][8] Harmless treatment Remove or stabilize harmful substances Solidification or stabilization [11] Thermal treatment [12] Separation or extraction [13] Based on the above issues, this paper investigated the solid waste generated from different sources of sewerage systems in Shenzhen, China, including solid waste from a sewerage system terminal and representative sites of various sewerage system facilities. The physical and chemical properties of solid waste from various sources in sewerage systems were tested.…”

Section: Reuse As Road Building Materialsmentioning

confidence: 99%

Characteristics and Resource Recovery Strategies of Solid Waste in Sewerage Systems

Lv²,

et al. 2023

Sustainability

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Sewerage systems-related solid waste accumulates in considerable quantities in urban water systems, including rainwater drainage pipes, pumping stations, grease traps, grit chambers, and septic tanks. Traditional management methods, such as sanitary landfilling, incineration, and composting, not only endanger the environment but also consume a significant amount of land. To address this problem, a variety of waste was collected from a terminal and different facilities in sewerage systems, and the characteristics of solid waste were tested and analyzed. The corresponding appropriate approaches to resource recovery strategies were proposed in detail. The solid waste in the wastewater treatment plant (WWTP) contains low organic matter content and a certain quantity of heavy metals, making recycling difficult. Before the solid waste enters the WWTP, the strategy of pre-sorting, treating, and recycling the solid waste is worth recommending. The waste was divided into three categories based on its nature, and corresponding resource utilization strategies were proposed. A small part of solid waste that is not suitable for pre-recycling can be discharged normally and enter the WWTP for treatment. This paper provides a scientific basis for the green resource utilization of solid waste in the field of sewerage systems in developing countries.

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“…Effect of R on fc/fc0 of concrete [23,[46][47][48][49][50][51][52][53][54][55][56][57][58][59]. Superscripts letters represents different mix proportion in each reference.…”

Section: Figurementioning

confidence: 99%

Effects of Steel Slag Powder as A Cementitious Material on Compressive Strength of Cement-Based Composite

Guohua

Jin

et al. 2023

Minerals

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The utilization rate of steel slag in China is far behind that of developed countries. The annual output of steel slag is still increasing, resulting in a large amount of accumulation, causing environmental pollution. This paper summarizes and analyzes the relevant research on steel slag powder (SSP) as a cementitious material, studies the effect of SSP replaces cement as single or multiple admixtures, with different specific surface areas, and the amount of activator on the compressive strength of cement-based material. The results show that due to the lower content of active substances in SSP compared to cement, the strengths decrease with the increase of the replacement ratio R, which is the ratio of SSP to cement. R = 30% is important for replacing cement with single SSP. When replacing cement with the mixture of SSP and slag/fly ash, the strengths of most groups decrease with the increase of the mix replacement ratio Rc. The decreasing trend is not obvious due to the pozzolanic effect. There is an optimal dosage for using a single activator to activate SSP. The effect of using multiple activators in combination is better than that of single one. The strength increases with the increase of the specific surface area (SSA) of SSP. However, if the SSA is too high, it will not only increase the preparation cost, but also reduce the increase in strength due to the agglomeration effect of SSP. The optimal range of specific surface area SSA is 400 m2/kg~500 m2/kg. With the increase of age t, the compressive strength increases. The effect of the curing methods on the compressive strength is hot and heat curing > standard curing > natural curing.

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Study on Road Performance of Cement Fly Ash Stabilized Steel Slag—Concrete Recycled Macadam

Cited by 11 publications

References 42 publications

Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment

Mechanical Properties and Damage Layer Thickness of Green Concrete under a Low-Temperature Environment

Characteristics and Resource Recovery Strategies of Solid Waste in Sewerage Systems

Effects of Steel Slag Powder as A Cementitious Material on Compressive Strength of Cement-Based Composite

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