Effects of recycled aggregates from construction and demolition wastes on mechanical and permeability properties of paving stone, kerb and concrete pipes

Özalp, Fatih; Yilmaz, Halit; Kara, Mustafa; Kaya, Ömer; Şahin, Aylin Yetim

doi:10.1016/j.conbuildmat.2016.01.030

Cited by 96 publications

(48 citation statements)

References 7 publications

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“…The unit weight of hardened concrete with recycled fine aggregate with different percentages was compared to the control/reference specimen in Figure 5. There was a decrement of unit weight of hardened concrete as a percentage of replacement of recycled fine aggregate increased [4,23]. This decrement was due to fine particles from mortar and old mortar attached to it.…”

Section: Unit Weight Of Hardened Concretementioning

confidence: 97%

“…DRFA could have had remaining gypsum, plastering, painting, and ceramics wastes after separation and purification processes were undertaken since the materials were from a demolished student dormitory. The water absorption capacity of recycled fine aggregates was higher than the normal aggregates, and the researcher [23] found that recycled aggregate can have 8-10% water absorption capacity. also agreed on the high water absorption capacity of the recycled fine aggregate due to the dust and the hardened porous cement mortar adhered to it [4,11,22].…”

Section: Fresh Concrete Propertiesmentioning

confidence: 98%

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Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia

2019

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Wherever there are construction activities, there is waste generation. In Ethiopia, the popular material for wall construction is a hollow concrete block that can be broken on the production site or the construction site during loading and unloading and is also found abundantly in demolished buildings. This research aimed at searching for alternative construction materials through recycling and examined the properties of recycled fine aggregate from demolished (old) and construction (new) hollow concrete block (HCB) wastes. The study examined the effect of the recycled HCB on fresh and hardened C-25 concrete properties and the possible replacement percentage of river sand by those recycled fine aggregates. The research also examined the comparative properties of the two recycled fine aggregates. The replacement percentage was in steps of 25%, starting from 25% up to 100%, and 0% represented the reference mix. In general, the recycled fine aggregate exhibited relatively lower physical properties than natural river sand but satisfied the American Society for Testing and Materials (ASTM) standard requirements. The demolished recycled fine aggregate (DRFA) had slightly lower physical properties than the construction recycled fine aggregate (CRFA). The properties of fresh and hardened concrete were decreased as percentage replacement of DRFA and CRFA increased. The optimum percentage replacement of river sand by recycled fine aggregate was between 50% to 75% but was much closer to 75% for that of recycled from construction (new) and closer to 50% for that of recycled from demolished (old) HCB. Recycling wastes can reduce environmental impact due to sand mining and waste disposal as well as partially conserve the natural resource depletion.

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Section: Unit Weight Of Hardened Concretementioning

confidence: 97%

Section: Fresh Concrete Propertiesmentioning

confidence: 98%

Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia

2019

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“…Wielu naukowców potwierdziło w swoich badaniach możliwość produkcji betonu z wykorzystaniem kruszywa z recyklingu, pochodzącego m.in. z odpadów budowlanych i rozbiórek [3], z rozdrobnionych odpadów betonowych [4], odpadów prefabrykowanych elementów konstrukcyjnych [5]. Kompozyt taki można otrzymywać także dodając popiół osadów ściekowych [6].…”

Section: Wprowadzenieunclassified

Ocena Możliwości Zagospodarowania Odpadów W Sektorze Budowlanym

Dębska

Górska

2016

ZNPRzBiS

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Ogromne ilości powstających odpadów stały się jednym z najważniejszych problemów środowiskowych. Zwiększona aktywność w dziedzinie budownictwa sprawia, że dużą część odpadów stałych stanowią odpady budowlane i rozbiórko-we. Konieczność zrównoważonego wykorzystania naturalnych zasobów i negatywne skutki niewłaściwej utylizacji odpadów, sprawiają, że możliwość zagospodarowania odpadów jest przedmiotem rosnącego zainteresowania wielu ośrodków badawczych na świecie. Korzystne i coraz częściej proponowane rozwiązania sugerują konieczność użycia materiałów odpadowych podczas produkcji wyrobów budowlanych przeznaczonych na budowę domów, dróg oraz innych elementów infrastruktury. Praktyka ta umożliwia zmniejszenie objętości odpadów składowa-nych na wysypiskach, jednocześnie ograniczając wykorzystanie naturalnie wydobywanych surowców, a tym samym przyczynia się do zmniejszenia emisji szkodliwych gazów cieplarnianych i wpływu przemysłu budowlanego na środowisko naturalne. Eksperymenty opisane w literaturze potwierdzają możliwość otrzymywania materiałów budowlanych z wykorzystaniem różnego typu odpadów. Liczne publikacje powstałe na ten temat skłaniają jednak do postawienia pytania o możli-wość realizacji takich działań w warunkach rzeczywistych. W ramach niniejszego artykułu opisano wyniki ankiety przeprowadzonej wśród firm produkujących materiały budowlane z terenu całej Polski. Ankieta ta przyjęła postać aplikacji internetowej udostępnionej na podstawie licencji opensource. Zawierała ona 10 pytań dotyczących realnego wykorzystywania odpadów w produkcji materiałów budowlanych oraz ponownego wykorzystania materiałów budowlanych i elementów konstrukcyjnych. Na ankietę odpowiedziały 22 firmy, z których połowa potwierdziła fakt wykorzystywania odpadów w produkcji materiałów budowlanych. Wśród najczęściej wymienianych odpadów znalazł się gruz betonowy i odpady powstałe w elektrowniach, co jest zgodne ze stanem przedstawionym w literaturze.

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“…Various waste materials can be used as SCMs as it was showed [7,8]. Mechanical behavior of different waste materials was investigated by several researchers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Cellular concrete waste as an economical alternative to traditional supplementary cementitious materials

Gyurkó

Szijártó

Nemes

2019

J Therm Anal Calorim

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Traditional supplementary cementitious materials (SCMs), like metakaolin or microsilica, highly improve various properties of concrete, making it more resistant against the effects of the environment. However, the cost of concrete is highly influenced by the applied amount of SCMs. Cellular concrete powder (CCP) is a by-product, produced by the cutting and curving process of cellular concrete blocks, which has the possibility to be used for similar purposes as SCMs. The present paper introduces the results of the laboratory experiments, conducted by the authors, and their analysis. The experiments were designed to investigate the effects of CCP on mortars, normal and high-strength concretes in terms of strength and durability. To get a deeper understanding of the processes taking place in a mortar or concrete containing CCP, thermogravimetric analysis was performed as well. CCP was applied in the mixes in different amount, and the performance of CCP was compared to SCMs. CCP was found to be a feasible alternative to SCMs in case of normal-strength concrete, while in case of high-strength concrete it did not improve the strength of the reference concrete. It could be traced back to the sulfate swelling of CCP particles. In optimal dosage, CCP was found to be preferable to metakaolin (MK) for durability characteristics. The combined usage of CCP and MK was investigated as well, but it did not result a concrete with better performance than the reference mix.

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Effects of recycled aggregates from construction and demolition wastes on mechanical and permeability properties of paving stone, kerb and concrete pipes

Cited by 96 publications

References 7 publications

Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia

Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia

Ocena Możliwości Zagospodarowania Odpadów W Sektorze Budowlanym

Cellular concrete waste as an economical alternative to traditional supplementary cementitious materials

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