Evaluation of sulfate resistance of slag contained concrete under steam curing

Yan, Xiancui; Jiang, Linhua; Guo, Ming-Zhi; Chen, Yunjie; Zhang, Song; Bian, Rui

doi:10.1016/j.conbuildmat.2018.11.073

Cited by 59 publications

(13 citation statements)

References 38 publications

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“…The series of higher contaminations (1.0% and 5.0% SO3) had the highest porosities, indicating a possible fragility of the matrix. Yan et al [43] observed a similar behavior in samples exposed to Na2SO4 solution (external sulfate attack). At initial ages (up to 180 days) samples exposed to 5% Na2SO4 solution presented smaller porosities than those exposed to the reference solution (confirmed by the crystallization of deteriorating products in the pores).…”

Section: Figurementioning

confidence: 70%

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Capraro

Filho

Medeiros

2021

Rev. IBRACON Estrut. Mater.

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The objective of this work was to evaluate the influence of the presence of sulfate in the microstructure and compressive strength of cement pastes. The lack of availability of more suitable aggregates, for reasons of distance or costs, sometimes leads to the use of materials that contain sulfate in their composition, which is harmful to cement mixtures. Currently, there are normative recommendations that limit the content of contaminants in the aggregates. However, there are still divergences as to the content that does not damage the concrete. In order to discuss the levels presented in the standards and the values above those allowed by them, tests were carried out on cementitious compounds contaminated by pyrite in different levels of sulfates (0.0%, 0.5%, 1.0% and 5.0% of SO3). SEM, XRD, compressive strength, ultrasonic pulse velocity and porosity analyses were performed in samples at different ages until 720 days of age. During early ages until the first year, the most contaminated samples presented an increase in their strength (1.0% and 5.0% of SO3). This behavior was explained by SEM, XRD and porosity analyses by filling the pores with products of sulfate attack, such as ettringite. At the end of the tests (720 days) the series that presented the lowest compressive strength, the presence of cracks and large amounts of ettringite was the one that had 5.0% SO3 contamination, proving the importance of a normative limit content.

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Section: Figurementioning

confidence: 70%

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Capraro

Filho

Medeiros

2021

Rev. IBRACON Estrut. Mater.

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“…This attributed to the activity of ITP was greatly stimulated under a steam curing regime [ 26 ]. As well as the hydration reaction of cement was accelerated at high temperature [ 28 ], which makes the structure denser and arrange neatly (will be discussed in Section 3.5 ) [ 29 ]. Moreover, the previous reports have confirmed that steam curing can significantly refine the pore structure [ 13 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

Zhong

Yan

et al. 2021

Materials

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It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective, three research tasks are conducted, including (1) preparing seven concrete formulations by introducing ITP; (2) characterizing their mechanical performance under different curing regimes; and (3) analyzing their microstructure by XRD patterns, FTIR analysis, and SEM observation. The experimental results show that there is an optimum ITP dosage (15%) for their application. The concrete with 15% ITP under standard curing obtains 94.3 MPa at 7 days, their early-age strength could be even further increased by ~30% (warm-water curing) and ~35% (steamed curing). The steam curing regime stimulates the activity of ITP and refines the microstructure. This study demonstrates the potential of replacing Portland cement with ITP in UHPC production.

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“…The SO 4 2− contents were accessed by a UV755B spectrophotometer with 440 nm wavelength. The details of the experimental procedure have been given in a previous research …”

Section: Methodsmentioning

confidence: 99%

Influence of compressive fatigue on the sulfate resistance of slag contained concrete under steam curing

Yan

Yang

Jiang

et al. 2019

Structural Concrete

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This paper investigated the influence of compressive fatigue on the sulfate resistance of slag (0, 20, 50, and 70%) contained concrete under steam curing. After 10,000 cycles loading of 0.5, 0.6, and 0.7 stress level, the concrete was exposed to 5% Na 2 SO 4 for 540 days. The compressive strength, relative dynamic modulus of elasticity (RDME) and SO 4 2− contents were tested after sulfate immersion. Results showed that the standard-cured fatigued concrete had less strength reduction than the steam-cured fatigued concrete during sulfate attack. The steam-cured fatigued concrete containing 20% slag suffered the largest strength reduction, followed by the concrete containing 50, 70, and 0% slag. Compressive fatigue at high stress level (0.7) accelerated the sulfate deterioration of PC standard-cured concrete, while the effect of low stress level (0.5) was minor. The RDME was not a sensitive indicator to access the sulfate resistance of concrete at the beginning of immersion. Compressive fatigue distinctly promoted the sulfate diffusion; the effective SO 4 2− diffusion coefficient was increased when damage occurred in slag concrete. Besides, based on the fatigue damage, an experimental model of the sulfate deterioration of fatigued concrete was proposed. K E Y W O R D S compressive fatigue, slag concrete, steam curing, sulfate resistance

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Evaluation of sulfate resistance of slag contained concrete under steam curing

Cited by 59 publications

References 38 publications

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Influence of internal sulfate attack on cement paste properties: contamination by pyrite

Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

Influence of compressive fatigue on the sulfate resistance of slag contained concrete under steam curing

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