The influence of microcrack width on the mechanical parameters in concrete with the addition of fly ash: Consideration of technological and ecological benefits

Golewski, Grzegorz Ludwik

doi:10.1016/j.conbuildmat.2018.08.157

Cited by 82 publications

(44 citation statements)

References 49 publications

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“…However, with the deepening of research, they have been used as mineral admixtures commonly in the preparation of concrete (including cement mortar). The use of FA and SF cannot only reduce the emission of greenhouse gases and solid waste in the production of cement clinker, improve the use of resources, but also improve the comprehensive properties of concrete and cement mortar [14][15][16]. Yang, Shi et al [17,18] studied the effect of FA on the mechanical properties of concrete, found that the concrete prepared with FA partially replacing cement had lower early strength but higher later strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Yin

Yan

et al. 2020

Materials

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To explore the influence of fly ash (FA) and silica fume (SF) on the mechanical properties of self-compacting concrete (SCC) under uniaxial and triaxial, the compressive strength test, splitting strength test, ultrasonic testing test, and triaxial test were performed in this paper. The results show that the 3 days compressive strength and splitting strength of SCC decreased with the increase of FA substitution rate. The 28 days, 56 days, and 91 days compressive strength and splitting strength of SCC increased first and then decreased with the increase of FA substitution rate. The peak stress and peak strain of SCC gradually increased with the increase of confining pressure. The peak stress and strain of SCC increased first and then decreased with the increase of FA substitution rate. Moreover, the relationship models between compressive strength and splitting strength, between compressive strength and amplitude, between peak stress, peak strain and confining pressure under different FA substitution rates were proposed. As a conclusion, the addition of SF can increase the strength of SCC obviously. Under uniaxial stress, SCC failure mode is splitting failure, under triaxial stress, SCC failure mode is shear failure. Based on the Mohr-Coulomb strength theory, the failure criterion of SCC with FA and SF was discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Yin

Yan

et al. 2020

Materials

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“…Examining the interfacial microcracks of composites is a highly important environmental, engineering and economic issue. Golewski summarized the main annual benefits associated with the use of FA in the amount of 20% as a substitute for cementitious binder. This study not only improves the structure of microcracks, but also has important ecological significance for reducing industrial waste.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of microcracks in the interfacial transition zone of recycled rubber concrete

Wang

2019

Structural Concrete

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This work focuses on the feasibility of recycling waste tire rubber aggregates into recycled concrete. The performance of interface transition zone (ITZ) is a key factor affecting the mechanical properties and durability of concrete. The influence of rubber particle size (5-10, 10-20, 20-50, and 50-90 mesh) and volume fraction of rubber aggregate (0, 10, and 20%) on the ITZ of common and rubber aggregatecement pastes was studied. Scanning electron microscopy was used to observe the microstructure of recycled rubber concrete cured at constant temperature and humidity for 28 days. Moreover, the size of microcracks in the ITZ area was evaluated. Results showed that the crack width of the ITZ between the rubber and cement paste (ITZ-R) and between the ordinary aggregate and cement paste (ITZ-S) showed similar variation patterns. The addition of 50-90 mesh rubber powder improved the ITZ micro-crack structure of rubber concrete. Increasing the rubber content and particle size also increased the microcrack width of ITZ. The size of rubber aggregate was the key factor affecting the crack width in ITZ. Finally, the addition of rubber inhibited the hydration degree of cement, reduced the formation of hydration products in ITZ and substantially affected ITZ-R. K E Y W O R D Sinterfacial transition zone, microcracks, recycled rubber concrete, scanning electron microscopy

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“…Fly ash, as an industrial by‐product, mainly comes from the coal combustion product in thermal power plants. The annual output of fly ash reaches 800 million tons all over the world, which is easy to cause serious environmental pollution . Today, the sustainable development view makes people pay more attention to the utilization of industrial wastes, which can effectively reduce environment pollution and increase resource utilization.…”

Section: Introductionmentioning

confidence: 99%

“…The annual output of fly ash reaches 800 million tons all over the world, which is easy to cause serious environmental pollution. 25 26 At present, the fly ash and phosphorus tailings have been applied in the fields of concrete, ceramic, cement, and so on. 26,27 In addition, the utilization of fly ash in flame retardant polymer materials has been reported in previous work.…”

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confidence: 99%

Synergistic effect between solid wastes and intumescent flame retardant on flammability and smoke suppression of thermoplastic polyurethane composites

Zhou

Liu

Zhou

et al. 2019

Polymers for Advanced Techs

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Phosphorus tailings and fly ash both are solid wastes and do harm to the environment. Here, they were added into thermoplastic polyurethane (TPU) matrices together with intumescent flame retardants (IFR), and the synergistic effects between IFR and phosphorus tailings or fly ash for improving the flame retardancy of TPU were investigated. The cone calorimeter test (CCT) results indicated that adding phosphorus tailings or fly ash substitute for part of IFR could obtain a better flame retardant effect. The peak heart release rate (PHRR) of TPU/25 wt% IFR composites exhibited a reduction of 77% than that of neat TPU, and the total smoke production presented a reduction of 16%. However, the PHRR value and total smoke production of the sample TPU/20 wt% IFR/5 wt% phosphorus tailings were reduced by 91% and 57%, respectively, compared to that of neat TPU. The dense char promoted by the presence of IFR and phosphorus tailings or fly ash delayed the diffusion of volatile pyrolysis products and transmission of heat and oxygen to the underlying material. Therefore, a certain amount of phosphorus tailings or fly ash can be used as synergistic agents with IFR to enhance the fire safety of TPU materials. From another aspect, it also provides a promising way for recycling use of phosphorus tailings and fly ash.

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The influence of microcrack width on the mechanical parameters in concrete with the addition of fly ash: Consideration of technological and ecological benefits

Cited by 82 publications

References 49 publications

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Evaluation of microcracks in the interfacial transition zone of recycled rubber concrete

Synergistic effect between solid wastes and intumescent flame retardant on flammability and smoke suppression of thermoplastic polyurethane composites

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