Novel lightweight concrete containing manufactured plastic aggregate

Alqahtani, Fahad K.; Ghataora, Gurmel S.; Khan, M. Iqbal; Dirar, Samir

doi:10.1016/j.conbuildmat.2017.05.011

Cited by 140 publications

(90 citation statements)

References 24 publications

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“…Obtained results are consistent with results of other papers, where plastics were used as aggregate for production of concretes/mortars as were reported e.g. by [7,12,13,14,37]. All mechanical characteristics of both reference and EPP samples increased with curing time due to the prolonged hydration time and development of denser concrete structure.…”

Section: Kα1_2 O Kα1 Ca Kα1supporting

confidence: 91%

Lightweight Concrete Made With Waste Expanded Polypropylene-Based Aggregate and Synthetic Coagulated Amorphous Silica

Záleská¹

2018

Ceramics - Silikaty

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Recycled plastic aggregate can be used as an alternative material to produce lightweight concrete with low environmental impact. Polypropylene is one of the least recycled post-consumer plastics. In the present study we focused at waste expanded polypropylene (EPP) aggregate that is used for partial replacement of natural aggregate to produce lightweight cementbased composites. Coagulated silica was used as admixture for improvement of dispersion of EPP particles in the cementbased matrix. At first, natural and EPP aggregates were examined. Coagulated silica was characterized by SEM, EDS, XRF, particles size distribution and pozzolanic activity. Analysis of the microstructure of lightweight concrete was performed using an optical microscope, SEM imaging and EDS. For the developed lightweight concrete, basic physical, mechanical and hygric properties were examined. Specific attention was paid to thermal properties. The results show, using of plastic waste aggregate led to a sufficient mechanical resistance, whereas the thermal insulation performance of the developed concrete was markedly improved. Composite with incorporated PP waste aggregates was found to be prospective material for nonstructural applications in building industry, which allows the development of buildings with optimum energy performance as well as reduce the growing environmental impact of waste polymers and saving the natural aggregates.

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Section: Kα1_2 O Kα1 Ca Kα1supporting

confidence: 91%

Lightweight Concrete Made With Waste Expanded Polypropylene-Based Aggregate and Synthetic Coagulated Amorphous Silica

Záleská¹

2018

Ceramics - Silikaty

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“…A study by Alqahtani et al [95] found that resistance to chloride ingress of concrete improves with the addition of plastic aggregates. The chloride ion permeability in lightweight concrete with 100% coarse plastic aggregates and with 0.5 and 0.6 water-cement ratios was 15% and 12% lower than the respective reference concrete [95]. Similar findings were reported by Kou et al [60], who attributed this to the impervious nature of waste plastic aggregates, which present a physical obstacle to chloride ingress ( Figure 16).…”

Section: Resistance To Chloride Ingressmentioning

confidence: 99%

“…However, conflicting results have been reported regarding the resistance of concrete incorporating recycled waste plastics to chloride ingress. A study by Alqahtani et al [95] found that resistance to chloride ingress of concrete improves with the addition of plastic aggregates. The chloride ion permeability in lightweight concrete with 100% coarse plastic aggregates and with 0.5 and 0.6 water-cement ratios was 15% and 12% lower than the respective reference concrete [95].…”

Section: Resistance To Chloride Ingressmentioning

confidence: 99%

Engineering Properties of Concrete with Waste Recycled Plastic: A Review

et al. 2018

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The abundance of waste plastic is a major issue for the sustainability of the environment as plastic pollutes rivers, land, and oceans. However, the versatile behavior of plastic (it is lightweight, flexible, strong, moisture-resistant, and cheap) can make it a replacement for or alternative to many existing composite materials like concrete. Over the past few decades, many researchers have used waste plastic as a replacement for aggregates in concrete. This paper presents a comprehensive review of the engineering properties of waste recycled plastic. It is divided into three sections, along with an introduction and conclusion. The influence of recycled waste plastics on the fresh properties of concrete is discussed first, followed by its influence on the mechanical and durability properties of concrete. Current experimental results have shown that the mechanical and durability properties of concrete are altered due to the inclusion of plastic. However, such concrete still fulfills the requirements of many engineering applications. This review also advocates further study of possible pre-treatment of waste plastic properties for the modification of its surface, shape, and size in order to improve the quality of the composite product and make its use more widespread.

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“…Konstrukcinio lengvojo betono mišiniui pagaminti greta sunkaus užpildo (smėlio, žvyro, skaldos) naudojami natūralūs arba dirbtiniai lengvieji užpildai. Dirbtiniai užpildai apima ir antrines žaliavas, kurių naudojimas betono mišiniams pastaruoju metu ypač suintensyvėjo (Alqahtani et al 2017). Konstrukcinio lengvojo betono naudojimas statiniams turi daug privalumų: mažesnis reikalingos armatūros kiekis, mažesni elementų skerspjūviai, galimybė statyti didesnio aukščio pastatus ir mažesnės medžiagų sąnaudos pamatams įrengti (Tanyildizi ir Coskun, 2008;Gunduz ir Ugur 2005).…”

Section: Poreikio Pagrindimas Privalumai Ir Trūkumai Bei Istorinė Apunclassified

Konstrukcinio armuoto lengvojo betono lenkiamųjų elementų deformacijų analizės modelis

Rumsys¹

2019

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Disertacijoje nagrinėjamos trumpalaike apkrova veikiamų armuoto lengvojo betono lenkiamųjų elementų deformacijos. Sukurti konstrukcinio lengvojo betono mišiniai, kurie panaudoti eksperimentinių sijų gamyboje. Atlikus sijų eksperimentinius tyrimus ir pritaikius atvirkštinio uždavinio algoritmą, gautos tempiamojo armuoto lengvojo betono įtempių ir deformacijų diagramos. Išanalizavus gautas diagramas, pasiūlytas modifikuotas armuoto tempiamojo betono fizikinis modelis, kuriame įvertinama lengvojo užpildo įtaka. Pasiūlyta modelio atitiktis įvertinta atlikus kitų autorių paskelbtų eksperimentinių lengvojo betono sijų netiesinę skaitinę analizę kompiuterine baigtinių elementų programa. Pagrindinis disertacijos tikslas-pasiūlyti fizikinį modelį trumpalaike apkrova veikiamų konstrukcinio armuoto lengvojo betono lenkiamųjų elementų įtempių ir deformacijų būviui analizuoti. Darbe sprendžiami keli pagrindiniai uždaviniai: atliekama armuoto lengvojo betono fizikinių modelių apžvalga, parenkama lengvojo betono sudėtis, atliekami eksperimentiniai armuoto betono elementų tyrimai, nustatomos armuoto tempiamo betono įtempių ir deformacijų diagramos, pasiūlomas armuoto tempiamo betono fizikinis medžiagos modelis, atliekamas modelio adekvatumo vertinimas bei realaus dydžio konstrukcijų skaitinis modeliavimas. Disertaciją sudaro įvadas, keturi skyriai, bendrosios išvados, naudotos literatūros ir autorius publikacijų disertacijos tema sąrašai bei trys priedai. Įvadiniame skyriuje aptariama tiriamoji problema, darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė reikšmė, ginamieji teiginiai. Pirmajame skyriuje atlikta literatūros analizė, kurioje pateikta lengvojo betono istorinė apžvalga ir pagrindinės savybės, fizikiniai medžiagos modeliai ir skaitiniai metodai. Antrajame skyriuje pateiktas lengvojo betono sudėties parinkimas. Taip pat tyrinėjamas lengvojo betono ilgaamžiškumo klausimas. Trečiajame skyriuje aprašomi atlikti armuoto lengvojo betono sijų eksperimentiniai tyrimai. Ketvirtajame skyriuje pateikiamas lengvojo betono teorinis medžiagų modelio išvedimas ir jo adekvatumo įvertinimas skaitiniu metodu. Taip pat pateikiami natūralaus dydžio konstrukcijų skaitinio modeliavimo rezultatai. Disertacijos tema paskelbti 8 straipsniai: vienas iš jų žurnale turinčiame citavimo rodiklį, du-konferencijų medžiagose, referuojamose Clarivate Analytics Web of Science duomenų bazės Conference Proceedings leidiniuose. Disertacijos tema skaityti 5 pranešimai tarptautinėse ir Lietuvos konferencijose.

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Novel lightweight concrete containing manufactured plastic aggregate

Cited by 140 publications

References 24 publications

Lightweight Concrete Made With Waste Expanded Polypropylene-Based Aggregate and Synthetic Coagulated Amorphous Silica

Lightweight Concrete Made With Waste Expanded Polypropylene-Based Aggregate and Synthetic Coagulated Amorphous Silica

Engineering Properties of Concrete with Waste Recycled Plastic: A Review

Konstrukcinio armuoto lengvojo betono lenkiamųjų elementų deformacijų analizės modelis

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