Relevant bibliographies by topics / Roll Spallings

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Roll Spallings'

Author: Grafiati
Published: 25 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Roll Spallings"

1

Hager, Izabela, and Katarzyna Mróz. "Role of Polypropylene Fibres in Concrete Spalling Risk Mitigation in Fire and Test Methods of Fibres Effectiveness Evaluation." Materials 12, no. 23 (November 23, 2019): 3869. http://dx.doi.org/10.3390/ma12233869.

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The explosive behaviour of concrete in fire is observed in rapidly heated concrete. The main factors controlling the occurrence of spalling are related to the material’s low porosity and high density as well as the limited ability to transport gases and liquids. Thus, for high-strength, ultrahigh-strength, and reactive powder concrete, the risk of spalling is much higher than for normal-strength concrete. The paper presents the discussion on the leading hypothesis concerning the occurrence of concrete spalling. Moreover, the methods for spalling prevention, such as polypropylene fibre application, which has been found to be an effective technological solution for preventing the occurrence of spalling, are presented. Various tests and testing protocols are used to screen concrete mixes propensity toward spalling and to evaluate the polypropylene fibres’ effectiveness in spalling risk mitigation. The most effective testing methods were selected and their advantages were presented in the paper. The review was based mainly on the authors’ experiences regarding high performance concrete, reactive powder concrete testing, and observations on the effect of polypropylene fibres on material behaviour at high temperature.
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Miah, Md Jihad, Francesco Lo Monte, Roberto Felicetti, Hélène Carré, Pierre Pimienta, and Christian La Borderie. "Fire Spalling Behaviour of Concrete: Role of Mechanical Loading (Uniaxial and Biaxial) and Cement Type." Key Engineering Materials 711 (September 2016): 549–55. http://dx.doi.org/10.4028/www.scientific.net/kem.711.549.

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Fire poses one of the most severe environmental conditions that can act on concrete structures as an external load and can induce severe damages (cracks, spalling) or even lead to collapse. Fire spalling of concrete is a complex phenomenon, which might occur due to pressure build-up in the pores, thermal and load-induced stresses. In this context, ordinary concrete specimens (B40-II and B40-III: fc28days ≈ 40 MPa) were exposed to standard fire curve (ISO 834-1), while a constant uniaxial or biaxial compressive load was applied. Six different levels of uniaxial compressive stress on cubes and four different levels of biaxial compressive stress on slabs have been investigated. The test results showed that loaded specimens are more susceptible to spalling than unloaded specimens, with increasing amount of spalling for higher values of applied load. It has been found that biaxially loaded specimens are more prone to spalling than uniaxially loaded specimens. B40-II concrete (3% of slag) exhibited higher spalling than the B40-III concrete (43% of slag).
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Zhao, Jie, Jian Jun Zheng, and Gai Fei Peng. "Modeling of Vapor Pressure Build-Up in Heated High-Performance Concrete." Applied Mechanics and Materials 204-208 (October 2012): 3691–94. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3691.

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Under high temperature conditions, such as fire, high-performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental to concrete structures. To prevent concrete from spalling, the mechanism should be understood. Since the build-up vapor pressure in concrete is supposed to play a dominant role in spalling, a vapor pressure prediction model is proposed in this paper to quantitatively analyze the vapor pressure, which can be used for the spalling mechanism study.
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Tian, Kai Pei, Yang Ju, Hong Bin Liu, Jin Hui Liu, Li Wang, Peng Liu, and Xi Zhao. "Effects of Silica Fume Addition on the Spalling Phenomena of Reactive Powder Concrete." Applied Mechanics and Materials 174-177 (May 2012): 1090–95. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1090.

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The explosive spalling of high-strength concrete due to fire is a problem that has garnered increasingly widespread attention, particularly the explosive spalling of reactive powder concrete (RPC). For years, based on the vapor pressure mechanism, the addition of fibers has been demonstrated to be somewhat effective in protecting against spalling. However, relevant experiments indicate that fibers are not effective for dense concrete, which is a challenge for the simple vapor pressure mechanism in providing spalling resistance for RPC. The authors found that silica fume plays an important role in the explosive spalling of RPC. Thus, four classes of RPCs with different ratios of silica fume were prepared, and the spalling phenomena and the inner temperature distribution during heating were investigated. The results show that silica fume content has a prominent effect on the spalling process of RPC.
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OHKOMORI, Yoshihiro, Ikuziro KITAGAWA, Keigo SHINOZUKA, Ritsuzo MIYAMOTO, Seiichi YAZAKI, and Mutsuhiko INOUE. "Study on Spalling of Hot Strip Mill Backup Roll." Tetsu-to-Hagane 73, no. 6 (1987): 691–98. http://dx.doi.org/10.2355/tetsutohagane1955.73.6_691.

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Zhang, Wenge, Christian Krempaszky, and Ewald Werner. "Work-roll surface degradation due to spalling of oxide layer." PAMM 7, no. 1 (December 2007): 4030041–42. http://dx.doi.org/10.1002/pamm.200701045.

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Dong, Zhong Qi, Jun Suo Li, and Jin Chen. "Research on CSP Work Roll Defect Causes and Improvement Measure." Advanced Materials Research 652-654 (January 2013): 1388–92. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1388.

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It was analysed that the causes for the poor wear resistance of roller, fracture of roller and the surface of the roller flaking off were researched. Introducing CSP plant carried through technical and improved works about work roll material and using system in order to improve strip quality and decrease producing costs. It’s effective to resolve wear and breakage and spalling of the work roll and improve profile control and so on.
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Mottahedi, Ali Akbar. "Investigation of Phase Transformation of Forged Steel Cold Rolls due to Heat Affecting and Prevent its Failure." Defect and Diffusion Forum 289-292 (April 2009): 219–24. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.219.

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In rolling Industries, cold rolls are chosen of low alloy steel heat treated to about 60 RC in 50 millimeter depth on surface. Troostite phase which happens in some cases in tempered martensite has lower fracture toughness, although its ductility is a little more. In rolling process, some technological problems seldom take place, and the roll might be locally heated accidentally. In cold rolling technology, this effect may cause a phase change in metallurgical structure on the surface of the cold work forged steel rolls, named Troostite. However, the rolls which subjected to this problem have no mechanical defect to be detected by NDT, but these kinds of affected rolls may be failed in working (rolling) by fracture, spalling or cracks. So Troostite is a harmful phase for rolls and causes lots of losses for rolling companies. The following paper is a practical industrial approach to show and follow thermal instability of roll surface and metallurgical change of the surface from sorbite to troostite by diffusion mechanism, due to any improper mill usage.
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OHKOMORI, Yoshihiro, Chu SAKAE, and Yukitaka MURAKAMI. "Analysis of Mode II Crack Growth Behavior in Spalling Failure of Backup Roll." Journal of the Society of Materials Science, Japan 50, no. 3 (2001): 249–54. http://dx.doi.org/10.2472/jsms.50.249.

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10

Yoo, S. H., S. W. Shin, and I. K. Kim. "Optimum Dosage of PP Fiber for the Spalling Control of High Strength Reinforced Concrete Columns." Key Engineering Materials 348-349 (September 2007): 621–24. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.621.

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Spalling is defined as damages to concrete exposed to high temperature during fire, causing cracks and localized bursting of small pieces of concrete. As the concrete strength increases, the degree of damage caused by spalling becomes more serious due to impaired permeability. It has been reported that polypropylene(PP) fiber has an important role in protecting concrete from spalling, and the optimum dosage of PP fiber is 0.2%. However, this result was based on the fire test of non-reinforced concrete specimens. The high-temperature behavior of highstrength reinforced concrete columns with various concrete strength and various quantity of PP fibers is investigated in this study. The results revealed that the ratio of unstressed residual strength of columns increased as the concrete strength increased and as the quantity of PP fiber increased from 0% to 0.2% the residual strength of columns increase. However, the effect of PP fiber quantity on residual strength of column was barely above 0.2%.
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Dissertations / Theses on the topic "Roll Spallings"

1

Darth, Pontus. "Simulation of Rolling Mill to Computeand Improve Load Distribution." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85595.

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This master thesis was done at Swerim AB in cooperation with SSAB and the Technical University of Luleå in the purpose of preventing spalling problems in hot rolling mills. Spallings are a fatigue damage that occurs on the rolls due to extreme loads and unfavorable conditions between the rolls in a mill. This report describes how the roughing mill, which is the first of a series of hot rolling mills is modelled and simulated in order to compute and improve the load distribution between the rolls. The load distribution tells a lot where the spalling problems occurs. By computer aided design and simulations with the finite element method a parametric computational model was created and used to simulate the load distribution between the work roll and backup roll with worn andfresh rolls. These simulations showed what the load distribution looks like when using new rolls and that the load distribution is especially bad when the work roll is worn. The computational model was used to simulate how the load distribution changes with different geometries on the backup roll to provide valuable input and suggest new designs on the backup roll currently used by SSAB Borlänge.
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Book chapters on the topic "Roll Spallings"

1

"Fractographic and Metallographic Study of Spalling Failure of Steel Straightener Rolls." In Handbook of Case Histories in Failure Analysis, 682–87. ASM International, 2019. http://dx.doi.org/10.31399/asm.fach.v03.c9001849.

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"Microstructural Features of Prematurely Failed Hot-Strip Mill Work Rolls: Some Studies in Spalling Propensity." In ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment. ASM International, 2019. http://dx.doi.org/10.31399/asm.fach.steel.c9001532.

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Apostolopoulos, Charis, and Konstantinos Koulouris. "Corrosion Effect on Bond Loss between Steel and Concrete." In Structural Integrity and Failure [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94166.

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This chapter is devoted to the effects of steel corrosion on bond relationship between steel and concrete. One of the basic assumptions in design of reinforced concrete members is the perfect steel - concrete bond mechanism, so that strain of reinforcing bar is the same as that of the surrounding concrete and these two different materials act as one. However, corrosion of steel reinforcement consists one of the main durability problems in reinforced concrete members, downgrade the bond behavior and therefore their structural integrity. Corrosion degrades the reinforcement itself, reducing the initial cross-section of the steel bar and its mechanical properties. Furthermore, tensile stresses in surrounding concrete caused due to oxides on the corroded reinforcement, lead to the gradual development of tensile field to the surrounding concrete, with spalling of the cover concrete and loss of bond mechanism as a consequence. In this chapter, an overview of damage of reinforced concrete due to steel corrosion is given, focused on the bond mechanism; factors that play key role in the degree of bonding and, also, proposed models of bond strength loss in correlation with the surface concrete cracking due to corrosion are indicated. To conclude, the ongoing research in this area of interest is presented, based on recent scientific studies.
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You might also be interested in the extended bibliographies on the topic 'Roll Spallings' for particular source types:
Journal articles
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