Use of alternative waste materials in producing ultra-high performance concrete

Ahmad, Shamsad

doi:10.1051/matecconf/201712003014

Cited by 10 publications

(5 citation statements)

References 19 publications

(26 reference statements)

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“…Similar results were reported by Ahmad et al [75], who conducted an optimization study on UHPC utilizing industrial waste materials as a cement replacement and silica fume. They found a compressive strength of 152 MPa at 28 days for UHPC with a flow of 255 mm and up to a 40% reduction in silica fume [69]. The growth rate ratio between the control sample and the optimized mixture decreased over time, reaching a similarity between 28 and 90 days, as depicted in Table 13.…”

Section: Compressive Strengthmentioning

confidence: 91%

“…Given the global importance of environmental issues, the use of waste materials such as recycled glass in the construction industry has grown in popularity [69,70]. This is especially important in the case of reactive powder concrete (RPC), which requires more cement and hence has a significant carbon footprint impact.…”

Section: Evaluation Of Properties Of Optimized Rpc's Mixturementioning

confidence: 99%

“…However, both RPC combination compositions showed insignificant measurements at 28 and 90 days, demonstrating CaC and GP's outstanding behavior. As a result, it may be inferred that the improved RPC may be used in constructions that must withstand harsh circumstances, such as those prevalent in coastal locations [69,79,80]. At different testing ages, all mixes function exceptionally well overall, with a discernible decrease in permeability to chloride ions with time.…”

Section: Chloride Ion Penetrationmentioning

confidence: 99%

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Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

Abellán-García,

Daza,

Molinares

et al. 2023

Materials

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In pursuit of developing an eco-friendly and cost-effective reactive powder concrete (RPC), we utilized a multi-objective optimization technique. This approach pivoted on the incorporation of byproducts, with a spotlight on ground glass powder (GP) as a pivotal supplementary cementitious material (SCM). Our goal was twofold: engineering cost-efficient concrete while maintaining environmental integrity. The derived RPC showcased robust mechanical strength and impressive workability. Rigorous evaluations, containing attributes like compressive strength, resistance to chloride ion penetration, ultrasonic pulse speed, and drying shrinkage, highlighted its merits. Notably, the optimized RPC, despite an insignificant decrease in compressive strength at 90 days compared to its traditional counterpart, maintained steady strength augmentation over time. The refinement process culminated in a notable 29% reduction in ordinary Portland cement (OPC) usage and a significant 64% decrease in silica fume (SF), with the optimized mix composition being 590 for cement, 100 for SF, 335 for GP, and 257 kg/m3 for calcium carbonate. Additionally, the optimized RPC stood out due to the enhanced rheological behavior, influenced by the lubricative properties of calcium carbonate and the water conservation features of the glass powder. The reactive properties of SF, combined with GP, brought distinct performance variations, most evident at 28 days. Yet, both mixtures exhibited superior resistance to chloride, deeming them ideal for rigorous settings like coastal regions. Significantly, the RPC iteration, enriched with selective mineral admixtures, displayed a reduced tendency for drying-induced shrinkage, mitigating potential crack emergence.

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Section: Compressive Strengthmentioning

confidence: 91%

Section: Evaluation Of Properties Of Optimized Rpc's Mixturementioning

confidence: 99%

Section: Chloride Ion Penetrationmentioning

confidence: 99%

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Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

Abellán-García,

Daza,

Molinares

et al. 2023

Materials

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“…(4) A high cement content ranging from 800 to 1100 kg/m3, along with a silica fume content between 150 and 300 kg/m3. (5) A significant steel fiber content of 2 to 5% (Ahmad 2017;Chen et al 2019). Mixing various highperformance fibers is one of the key factors for UHPC to achieve high performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon nanotubes and carbon fibers on the properties of ultra-high performance concrete for offshore wind power generation

Chen

2024

Int. J. Renew. Energy Dev.

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Ultra-high performance concrete (UHPC), as one of the most eye-catching building materials, has been the subject of extensive research by scholars. On this basis, to expand the application of UHPC for offshore wind turbine towers in complex marine environments, three different fiber materials - copper-plated microfibre steel fibers, carbon fibers, and carbon nanotubes (CNTs) - have been selected for the study of the possibilities of further improving the mechanical properties of UHPC. This study focused on understanding the impact of various fiber combinations and dosages on the flowability, compressive strength, flexural strength, and tensile strength of UHPC. Our findings indicate that carbon fiber, when present at a concentration of up to 0.5%, the effect on the fluidity of UHPC is only about 1.05%. However, the addition of CNTs significantly diminishes the flowability of UHPC, with a consistent decrease observed as the CNT content increases. Notably, when carbon fiber and CNTs are used in combination, the maximum reduction in flowability reaches 7.8%. Furthermore, as the dosage of these fibers increases, the compressive strength, flexural strength, and tensile strength of UHPC all demonstrate a positive trend of improvement. It is observed that the optimal performance is achieved when both carbon fiber and CNTs are present. In particular, carbon fiber exhibits a more profound impact on enhancing compressive strength and flexural strength, when carbon fibers were doped by volume at 0.5%, the compressive and flexural strengths were increased by 6.7% and 11.7%, respectively, compared to the control group, while carbon nanotubes increased the tensile strength by 7.4% at lower dosage. These findings highlight the potential of fiber combinations to optimize UHPC’s mechanical properties for various engineering applications..

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“…At present, it is widely utilised. SCC has greater compressive strength than flexural and tensile strength because it is brittle [6] so, in order too enhance the tensile and flexural strength of SCC, reinforcement is required. Steel fibres are most commonly used in concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres

Lakhiar

Abdullah

et al. 2021

Civil and Environmental Engineering Reports

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Many researchers have investigated alternative sources to overcome the problem of conventional building material polluting the environment by the development of green self-compacting concrete in the construction industry. The best alternative solution is to utilise non-conventional construction materials like agricultural wastes. Meanwhile, self-compacting concrete (SCC) is considered as high strength as well as high-performance concrete. The demerits, which include tensile and flexural strength, can be improved by incorporating coir fibres. The utilisation of coir fibres also modifies self-compacting concrete performance after cracking and improves the toughness. This study defines an experimental investigation of the mechanical properties of self-compacting concrete containing coir fibres (CF) with different percentages being 0%, 0.2%, 0.5%, 1%, and 1.5% at 7- and 28-days water curing. The mechanical properties include the slump flow and compressive and tensile strength were examined. The outcomes demonstrated that a required slump flow for self-compacting concrete was achieved using coir fibres up to 1%, beyond which it reduced the slump significantly. The length of fibre and proportion of fibres directly affected the workability. The compressive strength was 10% to 15% enhanced with the incorporation of coir fibres up to 0.5%; after that, the strength was slightly reduced, and tensile strength was 30% to 50% improved compared to conventional self-compacting concrete up to 1% of coir fibres incorporation in the SCC mix, after which it rapidly reduced.

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Use of alternative waste materials in producing ultra-high performance concrete

Cited by 10 publications

References 19 publications

Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

Effects of carbon nanotubes and carbon fibers on the properties of ultra-high performance concrete for offshore wind power generation

Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres

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