Influence of microsilica and polypropylene fibers on the fresh and mechanical properties of ultra-high performance geopolymer concrete (UHP-GPC)

Tayeh, Bassam A.; Akeed, Mahmoud H.; Qaidi‏, Shaker; Bakar, B.H. Abu

doi:10.1016/j.cscm.2022.e01367

Cited by 35 publications

(20 citation statements)

References 33 publications

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“…It consists of fine powders such as cement, quartz, fine sand, and mineral additives such as fly ash, silica fume, and ground granulated blast-furnace slag, used due to their pozzolanic properties and filling capacity (Shakor et al, 2019a;Puzatova et al, 2022;Vinod et al, 2022). With a low w/c ratio [typically less than 0.25 (Graybeal, 2014;Sanjuán and Andrade, 2021)], superplasticizers are also used to ensure good flow, consolidation, and workability of UHPC (Caluk et al, 2019;Tayeh et al, 2022a;Qaidi et al, 2022f). Discontinuous fiber reinforcement, typically made from steel with diameters of 0.5 mm, lengths of 12.5 mm, and dosage of 2%-4% by volume, are incorporated in UHPC mix to provide bond at the micro level and minimize micro-cracking (Harris and Roberts-Wollmann, 2005).…”

Section: Introductionmentioning

confidence: 99%

Influence of ternary hybrid fibers on the mechanical properties of ultrahigh-strength concrete

et al. 2023

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Ultra-high performance concrete (UHPC), an advanced class of fiber-reinforced cementitious material with extraordinary mechanical properties, low permeability, shrinkage and creep, and high energy absorption capacity, has seen steady increase in use, with applications covering construction of new members and retrofit of existing ones. Fibers are added in the UHPC mix to bridge cracks, carry tensile stresses, and contribute greatly to member ductility and load capacity. Hybrid fibers comprising micro and macro types are beneficial where the first type resists microcracking and the second targets macrocracking. This study investigates the effects of blending three fiber types, namely, hooked-end steel (referred to as type 1, representing macro fibers class), straight-end steel (type 2, intermediate size fibers), and carbon (type 2, micro size fiber), on the mechanical properties of UHPC. Experimental tests were performed to characterize the following mechanical properties: flowability, compressive strength, tensile strength, flexural strength, modulus of elasticity, and dry shrinkage. The primary variable in the tests was the blending of different fiber types, using either a unary form of type 1, a binary form of type 1 and 3 or type 2 and 3, and a ternary mix of all three types, at 1.56% dosage by volume. The mix with ternary fibers yielded a compressive strength, tensile strength, flexural strength, and modulus of elasticity that is 14%–17%, 14%–16.8%, 43.66%–22.16%, and 12%–16%, larger than the same respective properties of the mix with unary fibers. In addition, ternary fibers increased the cohesiveness of the mix by 17% and 26% compared to unary fibers.

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Section: Introductionmentioning

confidence: 99%

Influence of ternary hybrid fibers on the mechanical properties of ultrahigh-strength concrete

et al. 2023

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“…Worldwide, a substantial amount of WG is produced, and most of it ends up in landfills, where it puts dangers to both human and environmental health [ 35 ]. Furthermore, cementitious composites are the most widely used building materials [ [81] , [82] , [83] ], but their increased consumption results in the loss of natural resources and the release of CO 2 . To reduce environmental impact, WG might be used to partially substitute cement and sand in cementitious composites.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the effectiveness of waste glass powder for the compressive strength improvement of cement mortar using experimental and machine learning methods

Khan,

Ahmad,

Amin

et al. 2023

Heliyon

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“…As a result, unlike other materials, scientists are interested in using waste plastic granules as lightweight aggregate in the creation of lightweight concrete. This method enables the low-cost recycling of plastic trash as well as the manufacturing of lightweight concrete (Qaidi et al, 2022c;Tayeh et al, 2022a;Tayeh et al, 2022b).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the physical-mechanical properties and durability of high-strength concrete with recycled PET as a partial replacement for fine aggregates

et al. 2023

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In this study, PET plastic waste, which is a type of polymer commonly used in the manufacture of plastic bottles, has been incorporated into concrete by partially replacing the natural fine aggregate. An experimental study was conducted by casting and testing 90 concrete cylinders and 54 concrete cubes. A concrete mixture was designed in which the natural fine aggregate was substituted partially with PET plastic waste (PW) at a ratio of 0%, 25%, and 50%, with various w/c ratios of .40, .45, and .55. Physical, mechanical, and durability properties were assessed. The downside of the test results show degradation in each of the following characteristics: slump, compressive strength, splitting tensile strength, ultrasonic pulse velocity, water absorption, and porosity. The degradation of these characteristics increased with the increase in the volume of plastic aggregate (PA) and the w/c ratio. While the positive side of the results showed that with the increase of the PA volume and the w/c ratio, the fresh and dry densities decreased further, and by using 50% PET, the dry density became below 2000 kg/m3. Therefore, it is classified as lightweight concrete. Moreover, the fracture of concrete changed from brittle to more ductile compared to control concrete. Also, the thermal conductivity decreased significantly (11%–47%), and by using 50% of PET, the thermal conductivity became less than .71 W/mK, and accordingly, classified as a bearing insulator.

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Influence of microsilica and polypropylene fibers on the fresh and mechanical properties of ultra-high performance geopolymer concrete (UHP-GPC)

Cited by 35 publications

References 33 publications

Influence of ternary hybrid fibers on the mechanical properties of ultrahigh-strength concrete

Influence of ternary hybrid fibers on the mechanical properties of ultrahigh-strength concrete

Evaluating the effectiveness of waste glass powder for the compressive strength improvement of cement mortar using experimental and machine learning methods

Investigation of the physical-mechanical properties and durability of high-strength concrete with recycled PET as a partial replacement for fine aggregates

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