Study of the performance of steel fiber reinforced concrete to water and salt freezing condition

Niu, Ditao; Jiang, Lei; Bai, Min; Miao, Yang

doi:10.1016/j.matdes.2012.07.074

Cited by 86 publications

(45 citation statements)

References 19 publications

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“…Research into the durability of concrete under freezingthawing conditions has developed by examining the coupling effects arising from multiple factors combining to operate in a complex environment from a single factor Niu et al, 2013;Tikkanen et al, 2015;Yildirim et al, 2015). The damage resulting from salt has been a research focus in recent years because it is a problem encountered widely.…”

Section: Introductionmentioning

confidence: 99%

“…At the seventh international congress of cement chemistry, Wittman (1985) pointed out that the pore structure includes parameters such as porosity, pore size distribution, pore morphology and pore spatial arrangement. Compared with other durability indices, pore structure shows a higher correlation to the damage suffered by concrete under freeze-thaw environments.Research into the durability of concrete under freezingthawing conditions has developed by examining the coupling effects arising from multiple factors combining to operate in a complex environment from a single factor Niu et al, 2013;Tikkanen et al, 2015;Yildirim et al, 2015). The damage resulting from salt has been a research focus in recent years because it is a problem encountered widely.…”

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confidence: 99%

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Influence of pore structures on the frost resistance of concrete

Zhang

Guan-guo

Chao-ming

et al. 2017

Magazine of Concrete Research

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The effects of air content, mineral admixtures and strength on the freeze-thaw resistance of concrete were studied from the perspective of pore structure. With respect to different size ranges, the pore structures of concrete were analysed at multiple scales and across multiple dimensions by mercury intrusion porosimetry, gas physical adsorption method, linear traverse method and X-ray computerised tomography, respectively. The experimental results indicate that the size and quantitative characteristics of pores which are greater than 0·35 nm in diameter can be obtained by combining these four methods. As simply improving the strength grade tends to decrease the porosity, which further increases the air-void volume and number of harmful pores at a macro-scale, it is not necessarily conducive to improving the frost resistance of concrete. Moreover, when the air content varies from 2% to 6%, the proportion of tiny closed pores in concrete increases significantly, the spacing factor and average diameter decrease in turn, and the frost resistance improves with increasing air content. IntroductionThe mechanical properties and durability of concrete are affected by the pore structure, including the porosity, pore size, pore size distribution and specific surface area. Wu and Lian (1999) summarised the positive effects of pores and pointed out that the required performance can be obtained by adjusting the structure thereof. Based on Powers' experiment, Neville (2012) indicated that there is no simple functional relationship between the permeability of concrete and porosity, but the permeability mainly depends on the pore structure characteristics. At the seventh international congress of cement chemistry, Wittman (1985) pointed out that the pore structure includes parameters such as porosity, pore size distribution, pore morphology and pore spatial arrangement. Compared with other durability indices, pore structure shows a higher correlation to the damage suffered by concrete under freeze-thaw environments.Research into the durability of concrete under freezingthawing conditions has developed by examining the coupling effects arising from multiple factors combining to operate in a complex environment from a single factor Niu et al., 2013;Tikkanen et al., 2015;Yildirim et al., 2015). The damage resulting from salt has been a research focus in recent years because it is a problem encountered widely. At present, most pore structures are characterised by air content (Li et al., 2015), air-void spacing factor (ASTM, 2006;, porosity, critical pore size (Zhao et al., 2002) and so on. Many researchers have performed experimental investigations of the air-void spacing parameter in hardened concrete. However, the conclusions were quite different and vary from 200 μm to 800 μm. Now mercury intrusion porosimetry (MIP) is used widely, but there is still no satisfactory relationship established between the data and the macro-performance (Zhao et al., 2004).Therefore, in view of the different pore size ranges, MIP, the gas physical a...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Influence of pore structures on the frost resistance of concrete

Zhang

Guan-guo

Chao-ming

et al. 2017

Magazine of Concrete Research

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“…For instance, microscopy analysis by Ramezanianpour et al [11] showed evidence of highly porous ITZ forming between the hydrated cement paste and polypropylene fibers. According to Niu et al [12] and Yang et al [13], the deicer scaling resistance of concrete is reduced, especially for air-entrained concrete, with the addition of steel fibers relative to reference concrete without fibers at the same air content; it was reported that addition of fibers led to increasing the average spacing factor among air voids in the matrix and, thus, increasing its vulnerability to salt-frost scaling. It is worth emphasizing that degradation of concrete elements is often caused by the infiltration of fluids and deleterious agents, such as de-icing salts, as well as aggressive environmental conditions, such as freezing-thawing cycles [7,8].…”

Section: Introductionmentioning

confidence: 99%

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

Ghazy

Bassuoni

Maguire³

et al. 2016

Fibers

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Repair and rehabilitation of deteriorating concrete elements are of significant concern in many infrastructural facilities and remain a challenging task. Concerted research efforts are needed to develop repair materials that are sustainable, durable, and cost-effective. Research data show that fiber-reinforced mortars/concretes have superior performance in terms of volume stability and toughness. In addition, it has been recently reported that nano-silica particles can generally improve the mechanical and durability properties of cement-based systems. Thus, there has been a growing interest in the use of nano-modified fiber-reinforced cementitious composites/mortars (NFRM) in repair and rehabilitation applications of concrete structures. The current study investigates various mechanical and durability properties of nano-modified mortar containing different types of fibers (steel, basalt, and hybrid (basalt and polypropylene)), in terms of compressive and flexural strengths, toughness, drying shrinkage, penetrability, and resistance to salt-frost scaling. The results highlight the overall effectiveness of the NFRM owing to the synergistic effects of nano-silica and fibers.

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“…Karahan (2009)reported that concrete specimen with steel fibers has slightly better freeze-thaw resistancewhen compared plain concrete [2]. D. Niu et al (2013) investigated thatthe steel fiber volume fraction hashuge effect on the frost-resisting capacity of steel fiber reinforced concrete [29]. When a steel fiber content of 1.5 vol% is introduced, the frost damage is considerably reduced.…”

Section: Freeze-thaw Resistancementioning

confidence: 99%