Developing green and sustainable concrete in integrating with different urban wastes

Chen, Huaguo; Chow, Cheuk Lun; Lau, Denvid

doi:10.1016/j.jclepro.2022.133057

Cited by 44 publications

(4 citation statements)

References 160 publications

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“…The utilization of green additives, such as by-products from the power sector like fly ash, enables UHPC to further advance towards sustainable development by incorporating materials that would otherwise be discarded. Serval solid waste resources can serve as substitutes and have been incorporated into concrete and mortar to enhance their properties and conserve energy, including construction and demolition waste 193,194 , fly ash 21 , metakaolin 195 , silica fume 196 , waste glass 47,48,197 , plastic waste 198 , marble waste 199 and rock waste 200 . However, it has been reported that the utilization of green additives in UHPC concrete may possess a negative effect on fresh and mechanical properties, necessitating early consideration in roadways and structural applications to ensure optimal performance 65 .…”

Section: Sustainable Designmentioning

confidence: 99%

Multiscale perspectives for advancing sustainability in fiber reinforced ultra-high performance concrete

Wang,

Chow,

Lau

2024

npj Mater. Sustain.

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Ultra-high performance concrete (UHPC) integrates cutting-edge nano-additives, fibers and cementitious materials, which is a representative heterogeneous material and exhibits distinctive multi-scale structural characteristics. With remarkable durability and mechanical properties, lower embodied energy and diminished carbon emissions compared to conventional concrete, the application of UHPC aligns with the principles of sustainable development. To accelerate these advances, researchers of construction materials have incorporated a multiscale perspective into UHPC studies. From the perspective of sustainability, we evaluate the latest advances in the design, application and innovation of UHPC under multiscale perspective. Based on the fundamentals of fiber-reinforced UHPC, we discuss why and how could multiscale mechanics research, including analytical and modeling methods helps the advances of its sustainability, emphasizing the ecological considerations of UHPC in the practical applications. Then we summarize the challenges and perspectives in the design, production and construction of UHPC materials and structures. Based on advances in multiscale mechanics, a bright future can be envisioned where sustainable UHPC is applied globally, led by additive manufacturing and artificial intelligence.

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Section: Sustainable Designmentioning

confidence: 99%

Multiscale perspectives for advancing sustainability in fiber reinforced ultra-high performance concrete

Wang,

Chow,

Lau

2024

npj Mater. Sustain.

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“…Roller Compacted Concrete (RCC) is a highly compacted and densely packed paving material [8]. It is commonly used in the building of important infrastructure, such as highways, bridges, roads, and streets, especially in areas with high traffic volumes and considerable loads [9].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Roller Compacted Concrete: Assessing the Potential of Rice Husk Ash as a Cement Partial Replacement

2024

IRJMETS

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Concrete is essential in the field of civil engineering due to its durability, versatility, and toughness. The substantial rise in the worldwide demand for concrete has led to a corresponding surge in carbon dioxide (CO2) emissions, predominantly attributed to the manufacturing of cement. Roller-compacted concrete is a dense variety that is frequently used on heavily travelled roads. It is less flexible than regular concrete since it doesn't have any slumps. The quick and easy way to fix concrete pavements is with roller-compacted concrete, which is also quite affordable. The standard cubes and cylinders were cast using roller-compacted concrete by incorporating varying percentages from 5 to 30 percent of Rice Husk Ash as a partial cement replacement. The compressive strength characteristics of roller-compacted concrete were investigated in this work. It was determined that compressive strength significantly improved when the amount of rice husk ash was increased from 0% to 15%. These results highlight the significant impact that adding 15% more rice husk ash to cement in roller-compacted concrete results in greater compressive strength.

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“…Murthi et al [ 3 ] developed of green concrete using effective utilization of autoclaved aerated concrete brick trash as lightweight aggregate. Chen et al [ 4 ] studied green and sustainable concrete in integrating with different urban wastes.…”

Section: Introductionmentioning

confidence: 99%

Demolition Waste Potential for Completely Cement-Free Binders

Alani

Lesovik

et al. 2022

Materials

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Due to renovation and fighting in the world, a huge accumulation of construction and demolition waste is formed. These materials are effectively used as aggregates, but there is very little information about the use of scrap concrete to create cementless binders. The purpose of the work is to be a comprehensive study of the composition and properties of concrete wastes of various fractions with the aim of their rational use as cementless binders. The scientific novelty lies in the fact that the nature of the processes of structure formation of a cementless binder based on sandy fractions of the screening of fragments of destroyed buildings and structures, as a complex polyfunctional system, has been theoretically substantiated and experimentally confirmed. Different percentages of non-hydrated clinker minerals in concrete scrap were determined. In the smallest fraction (less than 0.16 mm), more than 20% of alite and belite are present. Waste of the old cement paste is more susceptible to crushing compared to the large aggregate embedded in it, therefore, particles of the old cement paste and fine aggregate predominate in the finer fractions of the waste. Comprehensive microstructural studies have been carried out on the possibility of using concrete scrap as a completely cementless binder using scanning electron microscopy, X-ray diffraction analysis, and differential thermal analysis. It has been established that for cementless samples prepared from the smallest fractions (less than 0.315 mm), the compressive strength is 1.5–2 times higher than for samples from larger fractions. This is due to the increased content of clinker minerals in their composition. The compressive strength of the cementless binder after 28 days (7.8 MPa), as well as the early compressive strength at the age of 1 day after steaming (5.9 MPa), make it possible to effectively use these materials for enclosing building structures.

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Developing green and sustainable concrete in integrating with different urban wastes

Cited by 44 publications

References 160 publications

Multiscale perspectives for advancing sustainability in fiber reinforced ultra-high performance concrete

Multiscale perspectives for advancing sustainability in fiber reinforced ultra-high performance concrete

Sustainable Roller Compacted Concrete: Assessing the Potential of Rice Husk Ash as a Cement Partial Replacement

Demolition Waste Potential for Completely Cement-Free Binders

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