Effect of Load Transfer Section to Toughness for Steel Fiber-Reinforced Concrete

Han, Yoon-Jung; Oh, Sung-Tag; Kim, Byoung-Il

doi:10.3390/app7060549

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Fiber reinforcement for concrete, in general, is mixed with concrete to improve the mechanical properties, such as tensile strength, bending strength, impact resistance, crack restraint, and toughness [28][29][30][31]. In this study, the tested specimens were prepared using steel fiber and micro polypropylene fiber.…”

Section: Concrete Reinforcing Fibermentioning

confidence: 99%

Section: Flexural Test Performancementioning

confidence: 99%

“…Figure 8 shows the toughness change for each section resulting from the waterproof reinforcement. The specimen without fiber reinforced inside the concrete showed a sharp decrease in toughness due to the brittle fracture after reaching the maximum load in the proportional limit [29,39]. On the other hand, for the reinforcement of the waterproof reinforcement material, the concrete matrix cracked after reaching the maximum load in the proportional limit and the waterproof reinforcement reinforced on the concrete surface suppressed cracking and loads instantly.…”

Section: Flexural Test Performancementioning

confidence: 99%

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A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete

Kim¹,

Gong

Song³

et al. 2020

Applied Sciences

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In this study, in order to protect the concrete layer from slab sinking cracks in the factory floor layer, four types of reinforcing materials with a notable waterproof performance are fixed at the bottom. Furthermore, short fibers mixed with concrete in order to evaluate the load transfer mechanism and residual stress retention ability are used. The change in flexural strength due to the waterproof reinforcement varied from about 10 to 48% depending on the type of reinforcing material, and the flexural strength of the specimen reinforced with Typar and Preprufe was demonstrated to be the best. Additionally, the increase in flexural strength due to the combination of the SF20 + Typar and MF2.8 + Preprufe specimens was remarkable. After the concrete matrix cracking, the toughness resulting from the fiber pull-out resistance and the increase in the reaction force of the waterproof reinforcement showed a marked improvement in all the test specimens. The test specimen reinforced with Typar demonstrated the best crack resistance regardless of the fiber type. The crack transfer mechanism in the concrete floor can be summarized in that the fiber pull-out resistance and the reaction force of the waterproof reinforcement immediately after cracking causes a reduction of the crack length (l) from the rapid load transfer, and as a result, the fiber bridging zone (lf) is widely protected. Therefore, it is determined that the residual stress rises, maintains, and slows, as the resistance of the fiber bridging in the cracked section and the effect of the waterproofing reinforcement layer is combined.

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Section: Concrete Reinforcing Fibermentioning

confidence: 99%

Section: Flexural Test Performancementioning

confidence: 99%

Section: Flexural Test Performancementioning

confidence: 99%

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A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete

Kim¹,

Gong

Song³

et al. 2020

Applied Sciences

Self Cite

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“…The Unconfined Compressive Strength (UCS) test at short term is the most used test to verify that the soil–cement was manufactured correctly [30,31,32,33,34,35]. On the other hand, a better characterization of the long-term performance is obtained by means of the Flexural Strength (FS) tests, and, more specifically, the four-point flexural beam test [17,18,36,37,38,39].…”

Section: Introductionmentioning

confidence: 99%

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

et al. 2019

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Soil–cement is an environmentally friendly road construction technique for base and subbase materials, which allows employing soils placed in the right-of-way of the road or in the surroundings, by improving its engineering properties. With this technique, it is possible to reduce the over-exploitation of quarries, the necessity of landfills and the pollutant gas emission due to the reduction of aggregate fabrication and transport. The manufacturing of soil–cement is generally controlled by means of the Uniaxial Compressive Strength (UCS) test at seven days, according to the regulations of each country. Nonetheless, one of the properties that best defines the performance of soil–cement is the Flexural Strength (FS) at long term, usually at 90 days. The aim of this paper is to develop new equations to correlate the UCS and the FS at long term and the UCS at seven days and at 90 days. Obtained results validate the proposed models and, hence, the flexural strength can be predicted from the Uniaxial Compressive Strength at seven days, allowing, if necessary, correcting measures (recalculation or rejection) in early stages of the curing time to be taken.

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“…The test that best represents the long-term performance of the cement-treated layers under traffic loads is the four points flexural beam test [25][26][27][28][29][30]. Nonetheless, the main problems of this test are the cost and the difficulty of manufacturing the required prismatic specimens with an acceptable density.…”

mentioning

confidence: 99%

New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials

Linares-Unamunzaga

Gonzalo-Orden

Minguela³

et al. 2018

Applied Sciences

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Understanding the long-term behaviour of cement-treated base materials is a key factor to improve its design and obtain environmentally friendly pavement base materials. Their characterization requires manufacturing prismatic specimens. However, various authors highlight the absence of standardized test methods for fabricating beams in the field and laboratory, which is not an easy task because it depends on the qualification and experience of the testing team. The aim of this paper is to present a new device and procedure for compacting prismatic specimens of cement-treated base materials. In this research, it was used for compacting soil-cement to simulate its performance as a road base material. This device employs elements that are generally available in a concrete laboratory test, such as a vibrating table or prismatic moulds. Once the procedure was established, and in order to verify its suitability, flexural and compressive strength tests were carried out. Results showed that the values obtained were consistent with this material and, despite the heterogeneity of the material, specimens from the same batch provided similar results and, hence, validated the compaction process. This new compacting procedure can improve understanding of the long-term performance of cement-treated materials from flexural and fatigue tests.

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Effect of Load Transfer Section to Toughness for Steel Fiber-Reinforced Concrete

Cited by 12 publications

References 7 publications

A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete

A Study of Waterproof Reinforcement Layers for the Post-Cracking Behavior of Fiber Reinforced Concrete

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

New Procedure for Compacting Prismatic Specimens of Cement-Treated Base Materials

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