Performance enhancement and environmental impact of cement composites containing graphene oxide with recycled fine aggregates

Long, Wu-Jian; Zheng, Dan; Duan, Huabo; Han, Ningxu; Xing, Feng

doi:10.1016/j.jclepro.2018.05.108

Cited by 78 publications

(35 citation statements)

References 42 publications

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“…The compressive strengths of PRGCs containing RC and RB were in the range of 4.4–8.1 and 2.4–7.2 MPa, respectively, and were lower than those of SD (13.6–26.3 MPa) due to the lower bulk density and specific gravity of recycled aggregates. Furthermore, the presence of more porous cement mortar in recycled aggregates make these aggregates weaker than natural aggregates and the bonding in the ITZ between the cement matrix and surface of recycled aggregate was weaker than that in natural aggregate cement composites . This is not a surprise as the incorporation of recycled aggregates generally reduced the mechanical properties of geopolymer‐based concrete .…”

Section: Resultsmentioning

confidence: 99%

“…This would result in a large amount of wasted concrete and other construction materials. The waste from construction and demolition (C&D) sites is commonly dumped in low lying areas or landfills for disposal instead of being reused and recycled . Recycled aggregates achieved by crushing waste concrete from laboratory tested concrete samples, rejected precast members, C&D waste, industrial waste and so on are a sustainable alternative to natural resources.…”

Section: Introductionmentioning

confidence: 99%

“…With the limited landfill areas in many parts of the world, there is a need to encounter the feasibility use of concrete production waste as innovative construction materials. Many researches have shown that recycled aggregate from recycled concrete aggregate (RC), recycled mortar aggregate, recycled concrete block aggregate (RB), recycled crushed clay brick aggregate, recycled lightweight concrete aggregate, and recycled civil engineering waste aggregate can be used to fabricate Portland cement composites.…”

Section: Introductionmentioning

confidence: 99%

“…The waste from construction and demolition (C&D) sites is commonly dumped in low lying areas or landfills for disposal instead of being reused and recycled. 1,2 Recycled aggregates achieved by crushing waste concrete from laboratory tested concrete samples, [3][4][5][6] rejected precast members, C&D waste, 7-10 industrial waste 11 and so on are a sustainable alternative to natural resources. Consequently, the consumption of recycled aggregate is not only an eco-friendly alternative approach and a value added process but also reduces the issue of waste storage.…”

Section: Introductionmentioning

confidence: 99%

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Use of recycled aggregates in pressed fly ash geopolymer concrete

Wongsa

Siriwattanakarn

Nuaklong

et al. 2019

Env Prog and Sustain Energy

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In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (PRGC) mixed with recycled concrete aggregate (RC) and recycled concrete block aggregate (RB) were investigated. Lignite coal fly ash, sodium hydroxide solution (NaOH), and sodium silicate solution were used as source materials to make geopolymer paste. The effect of fly ash to aggregate ratios and concentrations of NaOH on PRGC properties were tested. Test results were also compared to those of PRGCs mixed with conventional aggregate (limestone dust, SD). The test results showed that PRGCs containing RC and RB exhibited lower dry density, thermal conductivity, and compressive strength than those of PRGCs containing SD. Nevertheless, the compressive strength of PRGCs mixed with recycled aggregates was close to the compressive strength for moderate strength lightweight concrete as per ACI 213. Moreover, the lower thermal conductivity and dry density indicated better insulating properties than that of PRGCs containing SD. The developed PRGCs containing RC and RB in the study can be used for the manufacturing of hollow geopolymer‐based concrete block which are green material with improved insulating properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of recycled aggregates in pressed fly ash geopolymer concrete

Wongsa

Siriwattanakarn

Nuaklong

et al. 2019

Env Prog and Sustain Energy

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“…In this study, to enhance the mechanical properties of composites, this study optimizes the AAMs with nanomaterials. Nanomaterials have been widely applied in concrete to improve its mechanical performance [40][41][42][43]. Particularly, reduced graphene oxide (rGO) is used in construction for its large specific surface area, favorable mechanical strength, and high toughness [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Structural Applications of Thermal Insulation Alkali Activated Materials with Reduced Graphene Oxide

Long¹,

Lin²,

Tan³

et al. 2020

Materials

Self Cite

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Development of low thermal conductivity and high strength building materials is an emerging strategy to solve the heavy energy consumption of buildings. This study develops sustainable alkali activated materials (AAMs) for structural members from waste expanded polystyrene (EPS) beads and reduced graphene oxide (rGO) to simultaneously meet the thermal insulation and mechanical requirements of building energy conservation. It was found that the thermal conductivity of AAMs with 80 vol.% EPS and 0.04 wt.% rGO (E8–G4) decreased by 74% compared to the AAMs without EPS and rGO (E0). The 28-day compressive and flexural strengths of E8–G4 increased by 29.8% and 26.5% with the addition of 80 vol.% EPS and 0.04 wt.% rGO, compared to the sample with 80 vol.% EPS without rGO (E8). In terms of compressive strength, thermal conductivity, and cost, the efficiency index of E8–G4 was higher than those of other materials. A building model made from AAMs was designed using building information modeling (BIM) tools to simulate energy consumption, and 31.78% of total energy consumption (including heating and cooling) was saved in the building operation period in Harbin City, China. Hence, AAMs made of waste EPS beads and rGO can realize the structural and functional integrated application in the future.

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