Life cycle assessment multi-objective optimization and deep belief network model for sustainable lightweight aggregate concrete

Dabbaghi, Farshad; Tanhadoust, Amin; Nehdi, Moncef L.; Nasrollahpour, Sepideh; Dehestani, Mehdi; Yousefpour, Hossein

doi:10.1016/j.jclepro.2021.128554

Cited by 46 publications

(14 citation statements)

References 51 publications

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“…Ke et al proposed a procedure for determining the segregation index (SI Ke ) of concretes [28,38] with the ratio of densities measured in the same specimen (of the top sectionρ top -and the bottom section-ρ bottom ) as can be seen in Equation (1).…”

Section: Methods For Measuring the Segregation Through Image Analysis In Concretesmentioning

confidence: 99%

“…Lightweight aggregate concrete (LWAC) incorporates lightweight aggregates (LWA) into its mix and allows flexibility in the design, providing many advantages. There has been a rapidly growing demand for LWAC owing to its low weight, which reduces dead loads sustained by structural elements, reducing costs of foundation and seismic loads [1] and improving permeability [2]. Additionally, LWAC has favourable effects on the thermal properties due to its density, which provides better thermal insulation and fire resistance [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Smartphone Application for Determining the Segregation Index of Lightweight Aggregate Concrete

et al. 2021

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Due to the low density of the aggregates and the longer mixing times, lightweight aggregate concrete (LWAC) is susceptible to segregation of the aggregates. Several studies have proposed different methods to estimate the segregation of concrete because segregation affects strength and durability in structures. Image analysis techniques have become very popular for quickly analysing different materials and, together with the widespread use of mobile applications, can make it much easier for engineers to obtain parameters that identify concrete segregation. The aim of this work was the development of a mobile application to photograph the section of a concrete specimen and indicate the segregation values. A simple, fast, and effective application was implemented, and the results were validated with other previously published results, which can facilitate the task of engineers and researchers to determine the segregation of concrete.

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Section: Methods For Measuring the Segregation Through Image Analysis In Concretesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Smartphone Application for Determining the Segregation Index of Lightweight Aggregate Concrete

et al. 2021

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“…The outcomes have permitted us to conclude that fly ash (FA) is suitable for several applications in the construction sector [ 17 , 18 , 19 ]. MSWI-FA use in the production of lightweight concrete blocks is one of the most effective methods for reducing environmental impacts [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Compressive and Thermal Properties of Non-Structural Lightweight Concrete Containing Industrial Byproduct Aggregates

et al. 2022

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This study aimed to investigate the recycling opportunities for industrial byproducts and their contribution to innovative concrete manufacturing processes. The attention was mainly focused on municipal solid waste incineration fly ash (MSWI-FA) and its employment, after a washing pre-treatment, as the main component in artificially manufactured aggregates containing cement and ground granulated blast furnace slag (GGBFS) in different percentages. The produced aggregates were used to produce lightweight concrete (LWC) containing both artificial aggregates only and artificial aggregates mixed with a relatively small percentage of recycled polyethylene terephthalate (PET) in the sand form. Thereby, the possibility of producing concrete with good mechanical properties and enhanced thermal properties was investigated through effective PET reuse with beneficial impacts on the thermal insulation of structures. Based on the obtained results, the samples containing artificial aggregates had lower compressive strength (up to 30%) but better thermal performance (up to 25%) with respect to the reference sample made from natural aggregates. Moreover, substituting 10% of recycled aggregates with PET led to a greater reduction in resistance while improving the thermal conductivity. This type of concrete could improve the economic and environmental aspects by incorporating industrial wastes—mainly fly ash—thereby lowering the use of cement, which would lead to a reduction in CO2 emissions.

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“…may lead to a large number of scenarios with combinations of numerous alternatives. An approach to overcome these limitations is integrating HLCA and economic performance within a multiobjective optimization (MOO) framework. , …”

Section: Introductionmentioning

confidence: 99%

Toward a Sustainable Municipal Solid Waste Incineration Fly-Ash Utilization Network: Integrating Hybrid Life Cycle Assessment with Multiobjective Optimization

Wang

Dong

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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A utilization network optimization model toward sustainable municipal solid waste incineration fly-ash (IFA) management is first established with the integration of hybrid life cycle assessment (HLCA) and multiobjective optimization (MOO), taking Shanghai as a case. For technology selection, we focus on two emerging nonthermally processed IFA utilization technologies and the most widely used cement kiln coprocessing. By HLCA results, byproduct offsetting could significantly improve the environmental performance of IFA utilization ways, while nonthermal utilization has much lower global warming potential than cement kiln coprocessing, regardless of the allocation of byproducts or not. By combining HLCA with MOO, the trade-off solutions on the Pareto curve provide optimal decision-making alternatives for the IFA utilization network under multifactor constraints, including technology selection, site location, feedstock supplier, logistics under capacity constraints, and planning restrictions. The results show that the mixed use of IFA-to-brick and wastewater discharge and IFA-to-brick and salt technology would be the most preferable choice from a climate perspective, while IFA-to-brick and salts would be the most profitable one. In addition, since the market acceptance of nonthermally processed byproducts will affect the optimization results through price shocks, additional marketing policies and industrial symbiosis approaches are essential to develop sustainable IFA utilization technology under win-win targets of environment and economy.

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Life cycle assessment multi-objective optimization and deep belief network model for sustainable lightweight aggregate concrete

Cited by 46 publications

References 51 publications

Smartphone Application for Determining the Segregation Index of Lightweight Aggregate Concrete

Smartphone Application for Determining the Segregation Index of Lightweight Aggregate Concrete

Compressive and Thermal Properties of Non-Structural Lightweight Concrete Containing Industrial Byproduct Aggregates

Toward a Sustainable Municipal Solid Waste Incineration Fly-Ash Utilization Network: Integrating Hybrid Life Cycle Assessment with Multiobjective Optimization

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