Physico-mechanical, microstructural and dynamic properties of newly developed artificial fly ash based lightweight aggregate – Rubber concrete composite

Dehdezi, Pejman Keikhaei; Erdem, Savaş; Blankson, Marva Angela

doi:10.1016/j.compositesb.2015.05.005

Cited by 86 publications

(30 citation statements)

References 14 publications

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“…15.0 MPa and 22.6 MPa at 7 d and 28 d, respectively) implying that 15% CR replacement ratio significantly weakened the compressive strength. The reduction in compressive strength here is consistent with previous studies on AAM (Aly et al, 2019;Dehdezi et al, 2015;Park et al, 2016;Wongsa et al, 2018) that the compressive strength of AAM incorporating CR was reduced in different extents (up to 35.0% reduction) based on different CR replacement ratios.…”

Section: Effect Of Crsupporting

confidence: 91%

“…The reasons causing the strength reduction are similar to that in normal concrete incorporating CR, and can be explained as follows (Alsaif et al, 2018;Aly et al, 2019;Chen et al, 2019;Dehdezi et al, 2015;Fu et al, 2019;Turatsinze et al, 2007): (1) the hydrophobic nature (i.e. water-repelling)…”

Section: Effect Of Crmentioning

confidence: 93%

“…However, significant reductions in compressive and flexural strength (e.g. up to around 93% reduction depending on the replacement ratio of CR) were observed in either OPC or AAM containing CR (Aly et al, 2019;Dehdezi et al, 2015;Gandoman and Kokabi, 2015;Park et al, 2016;Wongsa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, several studies have reported the effect of CR on engineering properties of AAM. Dehdezi et al (2015) explored the microstructure and physical, mechanical and dynamic properties of lightweight AAF incorporating CR, and found that partially replacing fine aggregates by CRs in AAF can improve its impact strength and resistance to cracking under impact loading. Gandoman and Kokabi (2015) demonstrated pronounced improvement of sound absorption property and noise reduction coefficient in metakaolin-based AAM containing CR compared to conventional CRC.…”

Section: Introductionmentioning

confidence: 99%

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Engineering properties of crumb rubber alkali-activated mortar reinforced with recycled steel fibres

Zhong

Poon

Chen

et al. 2019

Journal of Cleaner Production

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To mitigate the potential problems of waste tyres and Portland cement greenhouse gas emissions while further promote the sustainable development of construction industry, this paper, for the first time, explores the workability and mechanical properties of crumb rubber alkali-activated fly ash-slag mortar reinforced with recycled tyre steel fibre (RSFRAM) considering different contents of crumb rubber (CR, i.e. 5%, 10% and 15% replacement by volume of fine aggregate) and recycled tyre steel fibre (RTSF, i.e. 0.5% and 1.0% by volume). The results indicate that the inclusion of CR led to a 4.7% to 26.7% improvement in workability of RSFRAM when the RTSF content was low, while the addition of RTSF compensated the strength loss caused by the addition of CR. The combination of CR and RTSF created a synergistic effect on the flexural behaviour of RSFRAM. The optimal mixture was regarded as R5F1.0 (5% CR replacement and 1.0 vol.% RTSF) exhibiting comparable compressive strength, and superior flexural strength (around 171.1% higher), toughness indices (highest among all RSFRAMs) and residual strength factors (higher than 100) compared to the reference mixture without CR and RTSF. In addition, R5F1.0 can meet the strength requirement of concrete (i.e. 28 MPa for basic construction application) and thus suitable for structural applications as a sustainable material.

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Section: Effect Of Crsupporting

confidence: 91%

Section: Effect Of Crmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Engineering properties of crumb rubber alkali-activated mortar reinforced with recycled steel fibres

Zhong

Poon

Chen

et al. 2019

Journal of Cleaner Production

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“…The formation and evolution of the ITZ are affected by many factors, including: wall effects which effectively repel solid grains from a solid surface, flocculation of cement grains, micro-bleeding giving a locally higher water/cement ratio, nucleation and precipitation of specific phases such as portlandite, one-sided growth, and gel syneresis [3,4]. Thus, the ITZ is considered to be a 'weak link' when describing or predicting the macroscopic performance of cementitious composites, such as mechanical and transport properties [5][6][7][8][9][10][11][12][13][14][15][16]. To better understand the influence of the ITZ microstructure on the macroscopic performance of the composite as a whole [17], it is necessary to quantify the thickness and volume fraction of the ITZ [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Quantification of the influences of aggregate shape and sampling method on the overestimation of ITZ thickness in cementitious materials

2018

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The microstructure of the interfacial transition zone (ITZ) surrounding the aggregate in a cementitious composite is quite different from that of the bulk matrix, because of its distinct physical nature including relatively high porosity and low rigidity. The thickness and volume fraction of the ITZ play a major role in determining the transport and mechanical behaviour of cementitious composites. However, the ITZ thickness may be overestimated when undertaking sectional plane analysis of these composites. Analysis of Platonic particles has previously shown that the sphericity of the particle is an important parameter in determining the overestimation of the ITZ thickness, but this raises the question of whether sphericity is sufficient to uniquely characterize the influence of aggregate shape. This paper investigates the influence of particle shape on overestimation of ITZ thickness for aggregate shapes which have the same sphericity values as Platonic particles; specifically, spheroids of differing geometries. A normal line sampling algorithm, which is designed to replicate the practical experimental process used in ITZ determination, is employed to obtain the apparent ITZ thickness. The influences of particle shape, sampling method and particle size distribution are investigated in terms of the overestimation of the ITZ volume fraction, and the effective diffusivity within three-phase composites, using the differential effective medium approximation.

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Controlling the mechanoadaptive properties of hydrogenated nitrile rubber by the incorporation of cementious based industrial waste for downhole application

et al. 2020

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This work aims to develop smart stimuli responsive composites utilizing hydrogenated nitrile rubber (HNBR), fly ash (FA), and slag (SG) with white cement (WC). HNBR has been chosen by capitalizing its unique attributes of high temperature performance and high oil resistance as the matrix and coining the synergistic setting characteristics of FA and SG as industrial wastes with WC. The composites displayed synergism in mechanical and thermal properties. The calcium-rich phases of FA and SG, entice the postpolymerization modification of the rubber matrix in conjunction with cement serving as reactive fillers. The changes of modulus (50 MPa), mass (7%), volume (8%), and hardness were observed upon repeated wet-dry cycles. These are attributed to the ionic interactions between the modified polymer matrix and cementitious phases as a result of postpolymerization conversion. These smart composite materials could be used for sealing and microfluidic valves for the downhole applications in oil field industries.

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Physico-mechanical, microstructural and dynamic properties of newly developed artificial fly ash based lightweight aggregate – Rubber concrete composite

Cited by 86 publications

References 14 publications

Engineering properties of crumb rubber alkali-activated mortar reinforced with recycled steel fibres

Engineering properties of crumb rubber alkali-activated mortar reinforced with recycled steel fibres

Quantification of the influences of aggregate shape and sampling method on the overestimation of ITZ thickness in cementitious materials

Controlling the mechanoadaptive properties of hydrogenated nitrile rubber by the incorporation of cementious based industrial waste for downhole application

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