A comprehensive review on effects of mineral admixtures and fibers on engineering properties of ultra-high-performance concrete

Sharma, Raju; Jang, Jeong Gook; Bansal, Prem Pal

doi:10.1016/j.jobe.2021.103314

Cited by 57 publications

(25 citation statements)

References 146 publications

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“…Explosive spalling of the control mix, which comprised just SF, occurred at an elevated temperature of about 300 C; specimens were crushed when it reached 500 C, as shown in Figure 3. Unlike normal concrete, which has a more porous microstructure, UHPFRC has a very dense microstructure, which leads to severe explosive spalling at elevated temperatures of 300-350 C. [8][9][10] UHPFRC is reinforced mainly with steel fibers which is the key to its good mechanical properties, and it was reported that UHPFRC with SF is very sensitive to elevated temperatures. Adding hybrid fibers to the SF in the mix reduces the intensity of the explosive spalling.…”

Section: Heating and Cooling Methodsmentioning

confidence: 99%

“…[1][2][3] UHPFRC is defined as a ductile, high-strength material created by containing quartz powder, fine silica sand, high-range silica sand, steel or organic fibers, a high range water reducer, and a very low water/binder ratio. [4][5][6] In recent years, numerous researchers [7][8][9][10][11] investigated the effects of fiber types, surface area, characteristics of fiber (strength, shape, and aspect ratio), fiber orientation, and fiber contact on the mechanical properties of UHPFRC. 12,13 The experimental results indicated that the addition of fibers had an adverse influence on the workability of UHPFRC as slump values decreased with increasing fiber content and gradually increased the UHPFRC strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

Ali,

Elsayed,

Tayeh

et al. 2023

Structural Concrete

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Evaluation of the effects of different fiber types with different ratios on the mechanical properties and explosive spalling prevention of Ultra‐High Performance Fiber Reinforced Concrete (UHPFRC) at elevated temperatures is the primary objective of the experimental work. Several fiber types, including steel fiber, polypropylene fiber, polyvinyl alcohol fiber, and natural jute fiber were used. Eight UHPFRC mixes were cast comprising the different hybrid fiber types. The results show that replacing polypropylene, polyvinyl alcohol, and jute fibers with steel fiber decreases the fresh and hardened properties of unheated UHPFRC while increasing durability. The existence of hybrid fibers improves the fire resistance of UHPFRC and fully prevents explosive spalling because of a considerable improvement in permeability. According to the test results, the optimum replacement ratio for UHPFRC mix is to replace polyvinyl alcohol fiber with an equivalent volume fraction of steel fiber, as it has a slight influence on the mechanical properties and prevented explosive spalling.

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Section: Heating and Cooling Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

Ali,

Elsayed,

Tayeh

et al. 2023

Structural Concrete

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“…Another method of self-healing that has been discussed is the use of different types of admixtures, including mineral or crystalline in creating self-healing concrete. [4,5,7,8,9,10,[11][12][13][14][15][16][17][18][19][20] With crystalline admixtures, the process requires moisture because the CO2 present in it reacts with calcium ions (Ca 2+ ) in the concrete to form calcium carbonate (CaCO3) which starts to fill the cracks and heal the concrete. The healing capability this promotes is for cracks up to 300 µm in width.…”

Section: Introductionmentioning

confidence: 99%

The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

et al. 2022

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The concept of self-healing concrete is becoming more necessary as sustainability in construction is more desirable. Amongst the current solutions in this technology are autogenous, chemical, and bacterial self-healing. It is paramount that secondary raw materials be used in the production of selfhealing concrete as a form of a sustainable solution. Therefore, in this paper, the admixture “Betocrete-CP-360-WP”, which is a crystallizing waterproofing admixture with hydrophobic effect and is 100% recyclable, has been used and its effect on the physical, chemical, and mechanical properties of concrete, as well as selfhealing capabilities of concrete, have been determined. According to the obtained results, the crystalline additive “Betocrete-CP-360-WP” has no effect on density and slightly increases the amount of entrained air in the concrete mix. However, it does decrease the workability of the concrete mixture which could prove problematic in transportation to the construction site or in concreting in general. Also, with the crystalline admixture in the concrete mix, a 60% reduction in concrete compressive strength after one day of hardening has been estimated, but after 7 and 28 days, the strength attained is within the ranges of the control samples. In addition, concrete containing Betocrete-CP360-WP was 30% less water permeable as compared to control samples. The self-healing efficiency of the concrete was determined by a water flow test through a formed crack (approximately 0.35 mm wide). This was done by gluing a plastic pipe to the top of the cracked concrete specimens and maintaining a constant pressure of the water in the pipe. The experiment was continued for 28 days, and the crack self-healing efficiency of the concrete was calculated from the differences in the amount of water passed through the crack before healing and after 7, 14, 21 and 28 days of the healing process. After 28 days of the water flow test, the cracks in the concrete with the crystalline admixture and recycled concrete dust were completely healed, while the control specimens were not.

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“…This progress has led to the development and production of high-strength concrete (HSC) and high-performance concrete (HPC) with desirable properties [ 10 , 11 ]. High-strength concrete has acceptable performance under harsh climates and humid environments due to its low permeability properties, thus decreasing maintenance and repair expenses [ 12 , 13 , 14 ]. Plain concrete, however, is generally fragile [ 13 ], with low tensile strength [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Impact Resistance of High-Strength Portland Cement Concrete Containing Steel Fibers

et al. 2022

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Impact resistance of Portland cement concrete (PCC) is an essential property in various applications of PCC, such as industrial floors, hydraulic structures, and explosion-proof structures. Steel-fiber-fortified high-strength concrete testing was completed using a drop-weight impact assessment for impact strength. One mix was used to manufacture 320 concrete disc specimens cured in both humid and dry conditions. In addition, 30 cubic and 30 cylindrical specimens were used to evaluate the compressive and indirect tensile strengths. Steel fibers with hooked ends of lengths of 20, 30, and 50 mm were used in the concrete mixtures. Data on material strength were collected from impact testing, including the number of post-first-crack blows (INPBs), first-crack strength, and failure strength. Findings from the results concluded that all the steel fibers improved the mechanical properties of concrete. However, hooked steel fibers were more effective than crimped steel fibers in increasing impact strength, even with a smaller length-to-diameter ratio. Concrete samples containing hybrid fibers (hooked + crimped) also had lower compressive strength than the other fibers. Comparisons and analogies drawn between the test results and the static analyses (Kolmogorov–Smirnov and Kruskal–Wallis) show that the p-value of the analyses indicates a more normal distribution for curing in a humid environment. A significant difference was also observed between the energy absorptions of the reinforced mixtures into steel fibers.

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A comprehensive review on effects of mineral admixtures and fibers on engineering properties of ultra-high-performance concrete

Cited by 57 publications

References 146 publications

Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

Effect of hybrid steel, polypropylene, polyvinyl alcohol, and jute fibers on the properties of ultra‐high performance fiber reinforced concrete exposed to elevated temperature

The investigations on properties of self-healing concrete with crystalline admixture and recycled concrete waste

Investigation of Impact Resistance of High-Strength Portland Cement Concrete Containing Steel Fibers

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