Development of steel slag composite grouts for

The grouting materials are new fields where cement clinker (CC) can be replaced by high amounts of steel slag (SS). To develop steel slag composite grouts (SSCG) for constructions and repairs in underground engineering, it is necessary to determine and optimize the performance of SSCG. In this study, the SS and blast furnace slag (BFS) contents ...

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Interdependent factors contributing towards carbonation of steel …

In this study, a kind of widely available steel slag, basic oxygen furnace slag (BOFS), was used as the sole material for fabricating dry-mixed compacts; the interactions of …

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Recycling of steel slag aggregate in portland cement concrete: An

Steel slag is a solid industrial byproduct of steelmaking and is a promising alternative aggregate in concrete due to its unique characteristics (Guo et al., 2019). Steel slag is generated during the process of extracting impurities from steel with lime (CaO), dolomite (MgO), and other auxiliary materials.

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Investigation on the Mechanical Properties and Microscopic

Additionally, the steel slag aggregate and the active components in the modified coating could interact, resulting in the hydration products effectively filling in the pores and microcracks of the ...

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Disintegration characteristics and mechanism of red clay …

While steel slag powder can effectively enhance the mechanical strength of soil and significantly reduce its water-induced swelling behavior ... In order to ensure the integrity and compactness of the specimens, five layered compaction was carried out during the sample making process, with the same mass of soil weighed in each layer, and the ...

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Experimental study and mechanism analysis on enhancing CO2

The indirect carbonation route involves extracting Ca 2+ ions from steel slag into a solution using leaching agents such as acetic acid [16], hydrochloric acid [17], or ammonium salts [18].Subsequently, the carbonation of Ca 2+ ions with CO 3 2– groups proceeds in the solution, producing high-purity CaCO 3.Luo et al. [19] used 0.25 M acetic acid to compare the Ca 2+ ion …

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Evaluation of the engineering properties and durability of mortar

Steel slag-slag composite powder (SSCP) has three exothermic peaks, which are the dissolution peak, hydration peak of steel slag and pozzolanic ash reaction peak of GBFS (after 85 h), respectively.

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Investigation on phosphogypsum–steel slag–granulated blast-furnace slag

This study investigated a cementitious material by utilizing two industrial wastes, phosphogypsum (PG) and steel slag (SS), combined with another industrial byproduct ground granulated blast-furnace slag (GGBFS) and limestone (LS). The 28d compressive strength of a mixture of 45% PG, 10% SS, 35% GGBFS and 10% LS exceeded 40 MPa. XRD and SEM ...

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Can Steel Slag be used as an Aggregate in Concrete and …

Compactness of the interface can be enhanced by improving the affinity of aggregate for moisture. Steel slag processes all the good ... steel slag be practically and successfully used as an aggregate in a rigid (confined) matrix: (ii) how to measure the stability and expansion of …

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Effect of the combination of polyvinyl chloride (PVC) and steel slag

The utilization of smaller steel slag particles resulted in enhanced particle packing and increased the overall compactness of concrete. Incorporating steel slag at a 10% replacement rate resulted in a pulse velocity that is 1% higher compared to the control mixture.

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Effects of high-temperature curing on hydration and …

Steel slag stored in a stainless-steel plate was placed in a steam curing box at a temperature of 80 °C, and the cracking of the steel slag was observed after two weeks. The chemical compositions of steel slag were determined by X-ray Fluorescence Spectrometer (XRF). The mineral phases of steel slag were tested by TTRAX III X-ray ...

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Inhibition mechanisms of steel slag on the early-age hydration of

As a by-product of steelmaking, steel slag accounts for 15–20 wt% of crude steel production [1, 2].Statistics show that nearly 200 million tons of steel slag are produced per year in the world [3, 4], of which more than 100 million tons are produced in China [5].However, only approximately 20% of the steel slag is utilized [6, 7].Most steel slag is haphazardly …

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Compaction Procedures and Associated …

The results show that the steel slag has a better surface texture than the natural aggregates; physical properties including compactness, flatness and compressive strength comply with the requirements for applying steel slag …

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(PDF) Road performance, VOCs emission and …

The compactness value and standard deviation of steel slag asphalt pavement and basalt asphalt pavement as illustrated in Fig. 6 (a). Obviously, the compactness value and standard deviation of

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Ultra-high strength carbonated slab prepared with steel slag …

In this work, ultra-high strength carbonated steel slag slabs were prepared with steel slag via accelerated carbonation. The carbonation process of steel slag was studied by the variation of heat of carbonation, pH value and CO 2 uptake over time. The synergistic effect of water-solid ratio (w/s) and voids in compacts (Vc) on the compressive strength and CO 2 …

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Effect of CO2 wet mineralized steel slag-granulated blast furnace slag

Effect of CO 2 wet mineralized steel slag-granulated blast furnace slag composite admixture on mechanical properties and chloride corrosion resistance of mortar. ... On the one hand, it fills the pores and cracks inside the mortar and improves the compactness of the mortar; on the other hand, it weakens the preferred orientation of Ca ...

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Understanding the dynamic rheological property of cement paste …

The primary mineral compositions in steel slag, including C 2 S, C 3 S, C 4 AF, etc., resemble those found in Portland cement, exhibiting some cementitious performance. This makes steel slag powder (SS) a useful mineral admixture. It is generally believed that the addition of SS can improve the workability of cement paste, as documented in prior research [4], [5].

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Research on macro-microscopic mechanical evolution …

This shows that the crushing resistance, impact resistance and compactness of steel slag aggregate are higher than those of crushed stone. The wear loss of steel slag in Los Angeles is larger than that of crushed stone, and it has a better ability to resist impact and friction. Steel slag has strong water absorption, and its water absorption ...

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Road performance, VOCs emission and economic benefit …

Obviously, the compactness value and standard deviation of steel slag asphalt mixture is higher than that of basalt asphalt, and both are greater than 98% of the specification requirements. This may be because under the same compaction energy, compared with basalt aggregate, steel slag aggregate has rich edge angle index, forming a tight ...

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Accumulation-hydration effect of steel slag powder and its …

Steel slag contains C 2 S, C 3 S, C 4 AF, and C 2 F and is mineralogically similar to cement, giving some cementing activity [19], [20]. ... The coarsened pore structure lowers the compactness of matrix and fiber/matrix interfacial bond and compromises its mechanical properties [54], [55]. In addition, due to the 15 % steel slag powder and 1.5 ...

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Application of Steel Slag in Road Semi-Rigid Subgrade and

The physical and mechanical properties of steel slag are comparable to those of natural aggregates. Reusing steel slag on a large scale as a substitute for natural aggregates can greatly reduce the need for natural resources and lower environmental harm, resulting in notable economic, environmental, and social benefits. However, the limited volume stability of steel …

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Study on the performance of collapsible loess subgrade improved …

With the growth of time, the hydration reaction of steel slag accelerates, and a large number of gels bind the steel slag fine aggregate and loess into a whole, which accelerates the improvement of compactness and promotes the strength growth of SSICL, as reflected in Fig. 7, where the UCS 60d /UCS 28d of SSICL is much larger than that of ...

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Experimental Study on Mechanical Properties and Stability of …

As marine-dredged mud and waste steel slag in coastal port cities continue to soar, the traditional treatment method of land stockpiling has caused ecological problems. Thus, it is necessary to find a large-scale resource-comprehensive utilization method for dredged mud and waste steel slag. This study uses waste steel slag and composite solidifying agents …

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Ultra-high strength carbonated slab prepared with steel slag …

In this work, ultra-high strength carbonated steel slag slabs were prepared with steel slag via accelerated carbonation. The carbonation process of steel slag was studied by …

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Evaluating potential expansion and strength of compacted steel …

Expansion of EAF steel slag aggregates during a first 7-day immersion: (a) fine aggregates 0-4.75mm, (b) mixed aggregates 0-19mm, and (c) coarse aggregate 4.75-19mm. …

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Study on the Performance of Steel Slag and Its Asphalt Mixture …

Calcium oxalate is generated on the surface of treated steel slag, which improves the surface compactness, effectively inhibits the expansion of steel slag caused by water …

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Hydration and Compressive Strength of Activated Blast-Furnace Slag

Alkali-activated materials (AAMs) are regarded as an alternative cementitious material for Portland cement with regards to sustainable development in construction. The purpose of this work is to investigate the properties of activated blast-furnace slag (BFS)–steel slag (SS) with sodium carbonate (NC), taking into account BFS fineness and Na2O equivalent. …

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A Review on the Carbonation of Steel Slag: Properties, …

Steel slag is a by-product of the steel industry and usually contains a high amount of f-CaO and f-MgO, which will result in serious soundness problems once used as a binding material and/or aggregates. To relieve this negative effect, carbonation treatment was believed to be one of the available and reliable methods. By carbonation treatment of steel slag, the …

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Effects of steel slag on the microstructure and mechanical …

The effects of steel slag (SS) addition on the strength and water resistance of magnesium phosphate cement (MPC) are investigated, and the hydration mechanism is proposed in this paper. With the addition of SS, the strength and water resistance of MPC were significantly enhanced. The compressive strength of MPC with 10 wt% SS (SS 10) cured in air for 60 d …

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High contents of steel slag in the road concrete: Hydration …

Steel slag (SS) is the main by-product in the steel production process. The main chemical components of SS are CaO, SiO 2, Al 2 O 3, FeO and MgO.The main mineral phases are dicalcium silicate (C 2 S) and tricalcium silicate (C 3 S), which are similar to cement [1], [2], [3].At present, Chinese annual crude steel output can reach more than 1 billion tons, and the …

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