Enhancement fracture behavior of sustainable cementitious composites using synergy between fly ash (FA) and nanosilica (NS) in the assessment based on digital image processing procedure

Theoretical and Applied Fracture Mechanics, Journal Year: 2024, Volume and Issue: 131, P. 104442 - 104442

Published: April 26, 2024

Language: Английский

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Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Materials Research Express, Journal Year: 2023, Volume and Issue: 10(8), P. 085505 - 085505

Published: Aug. 1, 2023

Abstract Fly ash (FA) is a waste product generated in thermal power plant huge quantitie has been posing problems of disposal. Therefore, the purpose this study to make meaningful utilization FA as binder concrete composites, while research involved low volume fly (LVFAC). The cements used studies were ordinary Portland cement (OPC), (FA-00) and two blended OPC containing amount of: 20% (FA-20) 30% (FA-30). This confronts following properties: water absorptions by immersion ( wa ) compressive strength f cm ). methodology tests was reflect conditions prevailing case reinforced structures operating below table. Both evaluated properties measured at 28 days. In addition, microstructure all materials also assessed. results show that, best , i.e. 48.96 MPa can be obtained FA-20 concrete. However, LVFAC decreases 45.10 MPa. On other hand average values 4.6% for FA-30 5.3% FA-20, respectively. Based on microstructural it found that behavior attributed reduced pore diameters densification matrix series showing loose porous microstructure, composite increased accordingly. conducted stated may increase durability subjected conditions. Furthermore, from an application point view, helpful understanding impact additive level concretes with waste.

Language: Английский

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Effect of Coarse Aggregate Grading on Mechanical Parameters and Fracture Toughness of Limestone Concrete

Infrastructures, Journal Year: 2023, Volume and Issue: 8(8), P. 117 - 117

Published: July 27, 2023

This work presents a discussion of the basic properties broken mineral limestone aggregates with specification affecting fracture toughness concretes made these aggregates. To determine influence grain-size distribution coarse for each concrete series, two types aggregate grain were used, maximum sizes 8 mm (series L1) and 16 L2). Fracture-toughness tests carried out using mode I fractures in accordance RILEM Draft recommendations, TC-89 FMT. During experiments critical stress-intensity factor (KIcS) crack-tip-opening displacements (CTODc) determined. The main mechanical parameters, i.e., compressive strength (fcm) splitting tensile (fctm), also assessed. Based on obtained results, it was found that influenced concrete’s fracture-mechanics parameters. results showed series-L2 had higher i.e.,: fcm—45.06 MPa, fctm—3.03 KIcS—1.22 MN/m3/2, CTODc —12.87 m10−6. However, size presented lower values all analyzed fcm—39.17 fctm—2.57 KIcS—0.99 —10.02 reason smaller weakness ITZ this composite compared to mm. test can help designers, producers, contractors working structures ensure more conscious composition mixes aggregates, as well produce precise forecasts operational composites containing fillers from carbonate rocks.

Language: Английский

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Mechanical properties and microstructure of ITZs in steel and polypropylene hybrid fiber-reinforced concrete

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 415, P. 135119 - 135119

Published: Jan. 26, 2024

To investigate the hybrid effect of steel-polypropylene fiber on macroscopic mechanical properties, fracture properties and microstructure interfacial transition zones (ITZs) concrete, 16 composite splitting tensile test three-point bending specimens with different volume fractions steel polypropylene fibers were tested by using MTS SEM. The results showed that significantly affected properties. 0.4%PF+ 1.0%SF composition is recommended, while a 30% decrease in toughness energy occurs when concrete contains 1.5%SF. Fiber type affects aggregate-mortar interface's ITZ micromorphology has influence mechanisms.

Language: Английский

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Using digital image correlation to evaluate fracture toughness and crack propagation in the mode I testing of concretes involving fly ash and synthetic nano-SiO₂

Materials Research Express, Journal Year: 2024, Volume and Issue: 11(9), P. 095504 - 095504

Published: Sept. 1, 2024

Abstract This paper presents the experimental results and deep discussion on simultaneous effect of fly ash (FA) synthetic nano-SiO 2 main strength parameters fracture toughness expressed by critical stress intensity factor, K Ic mathvariant="normal">S a new concrete based ternary blended cements (TC). Four series concretes were made, one which was control remaining three TC. The constant content 5% various FA contents such, i.e.: 0, 15 25% wt. as partial replacement cement studied. During studies DIC technique applied to determine deformation beams in propagation area modelled initial crack. Based it found that addition without increases approx. 20%. On other hand supplementing composition binder with combination 15% additive causes an increase all mechanical another However, mix 10% smaller analysed factors, i.e. compared composite modifier only. In addition, using observed including only crack paths almost perfectly rectilinear shape, significant width opening. containing + curvilinear characteristic additional microcracks vicinity crack, whereas very strongly curved had pronounced branching numerous From application point view, involving can be used execution specific types reinforced structures require material reduced brittleness at same time increased toughness.

Language: Английский

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Effects of GBFS content and curing methods on the working performance and microstructure of ternary geopolymers based on high-content steel slag

Construction and Building Materials, Journal Year: 2023, Volume and Issue: 410, P. 134128 - 134128

Published: Nov. 21, 2023

Language: Английский

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Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Materials, Journal Year: 2023, Volume and Issue: 16(23), P. 7363 - 7363

Published: Nov. 27, 2023

The advancement of eco-friendly technology in the construction sector has been improving rapidly last few years. As a result, multiple building materials were developed, enhanced, and proposed as replacements for some traditional materials. One notable example presents geopolymer substitute ordinary Portland concrete (OPC). manufacturing process (OPC) generates CO2 emissions high energy demand, both which contribute to ozone depletion global warming. implementation (GPC) provides path more sustainable growth cleaner environment. This is due concrete's ability reduce environmental pollutants industry's carbon footprint. achieved through its unique composition, typically involves industrial byproducts like fly ash or slag. These materials, rich silicon aluminum, react with alkaline solutions form binding gel, bypassing need high-energy clinker production required OPC. use such not only reduces but also contributes waste minimization. Additionally, offers extra advantages compared OPC, including improved mechanical strength, enhanced durability, good stability acidic settings. Such properties make GPC particularly suitable range environments, from applications infrastructure projects exposed harsh conditions. paper comprehensively reviews different characteristics geopolymers, include their compressive curing methods. Furthermore, impacts related evaluated life-cycle assessment method. result demonstrated that maintains positive fact it produces fewer dioxide OPC during manufacturing; however, had minor negative impacts, abiotic depletion, human toxicity, freshwater ecotoxicity, terrestrial acidification. are important considerations ongoing research aimed at further sustainability concrete. Moreover, was determined silicate content, temperature, proportion solution binder major factors significantly influencing strength represents just stride toward practices paves way innovative approaches field

Language: Английский

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Advances in microbial self-healing concrete: A critical review of mechanisms, developments, and future directions

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 947, P. 174553 - 174553

Published: July 6, 2024

The self-healing bioconcrete, or bioconcrete as concrete containing microorganisms with capacities, presents a transformative strategy to extend the service life of structures. This technology harnesses biological capabilities specific microorganisms, such bacteria and fungi, which are integral material's capacity autonomously mend cracks, thereby maintaining structural integrity. review highlights complex biochemical pathways these organisms utilize produce healing compounds like calcium carbonate, how environmental parameters, pH, temperature, oxygen, moisture critically affect repair efficacy. A comprehensive analysis recently published peer-reviewed literature, contemporary experimental research forms backbone this focus on microbiological aspects process. assesses challenges facing including longevity microbial spores cost implications for large-scale implementation. Further, attention is given potential directions, investigating alternative agents optimizing environment support activity. culmination investigation call action integrating in construction broader scale, realizing its fortify infrastructure resilience sustainability.

Language: Английский

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Assessment of mechanical, durability and microstructural performance of sulphate-resisting cement concrete over portland cement in the presence of salinity

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 420, P. 135527 - 135527

Published: Feb. 28, 2024

Language: Английский

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Concrete incorporating supplementary cementitious materials: Temporal evolution of compressive strength and environmental life cycle assessment

Heliyon, Journal Year: 2024, Volume and Issue: 10(3), P. e25056 - e25056

Published: Jan. 22, 2024

The use of Supplementary Cementitious Materials (SCMs) or industrial wastes as a partial replacement for cement in the production concrete is an urgent need construction industry due to cement's growing environmental challenges and rising cost. In respect this, we conducted research work on proportioning binary mixes. Fly ash (FA) replaced 10 %, 20 30 % cement, while silica fume (SF) 5 15 cement. A control mix was also developed with 100 no SCM. results showed increase compressive strength FA compared at early age 3–28 days, but maximum 4 discovered later 56 days FA. For SF concrete, considerable seen 3 days. Like 2 improvement recorded concrete. This study further focused concrete's temporal evolution by developing model (SEM) using nonlinear regression analysis 95 confidence level. Pearson correlation coefficient used determine between values experimental results. comparison, fib Model Code 2010 applied data, good agreement observed among proposed model, values, can be expanded address regression-related problems. Finally, life cycle assessment revealed that utilizing lowered Global Warming Potential (GWP) 9 19 29 respectively. Likewise, reduced GWP 14 %.

Language: Английский

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