Durability of Steel Fibre Reinforced Concrete (SFRC) exposed to acid attack – A literature review

Marcos-Meson, Victor; Fischer, Gregor; Edvardsen, Carola; Skovhus, Torben Lund; Michel, Alexander

doi:10.1016/j.conbuildmat.2018.12.051

Cited by 111 publications

(47 citation statements)

References 58 publications

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“…In particular, the reinforcement of recycled aggregate concrete using fibers leads to reduced micro-cracks in the cement matrix as well as to an increase in material density. There have been numerous studies on the applications of steel fiber [17][18][19][20][21][22][23] and polypropylene (PP) fibers [24][25][26] in concrete. Moreover, the PP fiber also enjoys popularity in the domain of recycled aggregate concrete [4,27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nylon Fiber Addition on the Performance of Recycled Aggregate Concrete

Lee

2019

Applied Sciences

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The adhered mortars in recycled aggregates (RA) may lower the performance of the concrete, by for instance reducing its strength and durability, and by cracking. In the present study, the effect of nylon fiber (NF) on the permeability as well as on the mechanical properties of concrete incorporating 100% RA was experimentally investigated. Concrete was produced by adding 0, 0.6 and 1.2 kg/m3 of NF and then cured in water for a predetermined period. Measurements of compressive and split tensile strengths, ultrasonic pulse velocity and total charge passed through concrete were carried out, and the corresponding test results were compared to those of concrete incorporating crushed stone aggregate (CA). In addition, the microstructures of 28-day concretes were examined by using the FE-SEM technique. The test results indicated that recycled coarse aggregate concrete (RAC) showed a lower performance than crushed stone aggregate concrete (CAC) because of the adhered mortars in RA. However, it was obvious that the addition of NF in RAC mixes was much more effective in enhancing the performance of the concretes due to the crack bridging effect from NF. In particular, a high content of NF (1.2 kg/m3) led to a beneficial effect on concrete properties compared to a low content of NF (0.6 kg/m3) with respect to mechanical properties and permeability, especially for RAC mixes.

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Section: Introductionmentioning

confidence: 99%

Effect of Nylon Fiber Addition on the Performance of Recycled Aggregate Concrete

Lee

2019

Applied Sciences

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“…The compressive strengths of the in situ concrete specimens are shown in Figure 6. As we know, once concrete is subjected to acid attack, the compressive strength of the concrete will be reduced gradually [24]. The exposure times of 300 and 510 d did not exert any remarkable differences on concrete strength, and the different locations in the cooling tower also had no obvious influences on concrete strength (Figure 6).…”

Section: Results From Monitoringmentioning

confidence: 98%

“…Partial specimens were retrieved from the platforms inside the cooling tower, and typical photographs of these specimens are shown in Figure 5. After power plant operation for 300 and 510 days, no sign of corrosion and no evident differences between specimens at different locations were observed on the specimens’ surfaces; moreover, no holes that might be due to acid attack [24] nor white crystals caused by sulfate attack [23] were found.…”

Section: Results From Monitoringmentioning

confidence: 99%

Influence of Flue Gas Injection on the Long-Term Durability of a Natural Draft Concrete Cooling Tower

Zhuang

et al. 2019

Materials

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The article undertakes the very important topic of the long-term durability of concrete in a natural draft concrete cooling tower with flue gas injection. The corrosive conditions, including temperature, relative humidity, and CO2 and SO2 gas concentrations, near the inner wall of a cooling tower with flue gas injection were monitored in real time to obtain the long-term durability performance of concrete. The pH and chemical compositions of the condensed liquid that adhered to the tower’s inner face and the macromorphology, compressive strength, and neutralization depth of in situ specimens were tested periodically. In addition, a finite element numerical simulation was conducted to simulate and verify the concentration distributions of CO2 and SO2 in the flue gas in the cooling tower. The results showed that the cleaned flue gas was enveloped, diluted, and uplifted by hot vapor in the cooling tower, and its concentration decreased. Meanwhile, the effective diffusion radius increased gradually as the flue gas rose. With the same elevation in the cooling tower, the concentration of flue gas decreased rapidly from the central point to the surrounding area. The air near the inner surface of the cooling tower was merely dampened air with a low concentration of acidic gas due to the gigantic diameter of the cooling tower. As a result, the injection of cleaned flue gas will not evidently increase the corrosion risk in a natural draft concrete cooling tower.

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“…A gradual decrease in the pH of the pore solution and its buffering capacity is reported to occur due to the diffusion of OH − and H + as well as alkali and Ca 2+. 3 …”

Section: Resultsmentioning

confidence: 99%

Sulfuric acid resistance of alkali/slag activated silico‐manganese fume‐based mortars

Nasir

Johari

Maslehuddin

et al. 2020

Structural Concrete

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The resistance of alkaline‐activated silico‐manganese fume (SMF) and blast furnace slag (BSF)‐based mortar, prepared by varying BFS and NaOHaq composition, during 20 weeks of exposure to 5% sulfuric acid (H2SO4aq) of initial pH = 0.24 and pure water (controlled) was studied. The deterioration was monitored by visual, alkalinity, mass, compressive strength and microstructural tests. The set of specimens synthesized included: (a) BFS‐free high alkaline, (b) SMF‐BFS blended high alkaline, and (c) SMF‐BFS blended mild alkaline system. Their residual strengths after 20 weeks of acid exposure were 20.1, 18.6, and 16%, respectively. BFS‐free specimens exhibited high resistance to acid attack due to the dearth of Ca in SMF. BFS‐admixed mild alkali system resulted formation of more gypsum and dealumination attributed to incomplete dissolution of Ca grains leading to severe spalling. BFS‐admixed high alkaline system underwent moderate resistance due to dense microstructure formed by additional C‐S‐H, K‐A‐S‐H, and C‐Mn‐H gel which enhanced retention of the polymerized framework.

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Durability of Steel Fibre Reinforced Concrete (SFRC) exposed to acid attack – A literature review

Cited by 111 publications

References 58 publications

Effect of Nylon Fiber Addition on the Performance of Recycled Aggregate Concrete

Effect of Nylon Fiber Addition on the Performance of Recycled Aggregate Concrete

Influence of Flue Gas Injection on the Long-Term Durability of a Natural Draft Concrete Cooling Tower

Sulfuric acid resistance of alkali/slag activated silico‐manganese fume‐based mortars

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