Characterization flowchart for assessing the potential reuse of excavation soils in Sao Paulo city

Kataguiri, Karen; Boscov, Maria Eugênia Gimenez; Teixeira, Cláudia Echevenguá; Angulo, Sérgio Cirelli

doi:10.1016/j.jclepro.2019.118215

Cited by 32 publications

(16 citation statements)

References 31 publications

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“…In China, considering 0.9 t excavation per m 2 built 47 , this material could currently supply half of the construction material requirement 48 . A better use of this material is possible through washing to extract sand and gravel from it 49 or directly through clay based concrete 50 . Finally, sustainable resource management can be achieved through promotion of strong policy and regulatory frameworks, such as certification systems to secure the good practice along the supply chain (e.g., CSC label 51 ).…”

Section: Regional Resource Scarcitymentioning

confidence: 99%

Environmental impacts and decarbonization strategies in the cement and concrete industries

Habert

Miller

John

et al. 2020

Nat Rev Earth Environ

634

269

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The use of concrete is under scrutiny as it appears as one of the few human activities where the transition toward a post-carbon society is not possible unless large investments in risky carbon capture and storage are made. With current urbanization, it is also a sector that is expected to continuously grow, leading to increased resource consumption and emissions. In this review, we aim to shed light on the available solutions that can be implemented in the short and long term to reduce greenhouse gas emissions. Rather than waiting for disruptive technologies that could transform a very slow moving and risk-averse construction sector, this review focuses on the small improvements that every stakeholder involved along the value chain of concrete production and use can achieve. We stress how significant the combined effect of these marginal gains can be. By balancing societal needs, environmental requirements, and technical feasibility, the intention of this review is to show credible pathways for a transition to sustainable use of concrete. Key points• Cement usage is so massive, more than 4 billion tonnes per year worldwide, that large-scale replacement by other materials within the next decade is not possible.• Environmental impact of cement and concrete is low per unit of material, but the amount used makes the impact of the sector highly significant.• Reductions in CO 2 emissions are possible through successive improvement all along the cement and concrete value chain: less clinker in cement, less cement in concrete, less concrete in structures, and less replacement of structures.• By engaging all stakeholders of the construction sector, immediate savings of the order of 50% can be reached without heavy investment in new industrial infrastructure or modification of standards.• Research and development need urgently to be conducted for post-2050 construction to meet future emissions reduction targets. Alternative cement and faster carbonation of concrete should be explored.

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Section: Regional Resource Scarcitymentioning

confidence: 99%

Environmental impacts and decarbonization strategies in the cement and concrete industries

Habert

Miller

John

et al. 2020

Nat Rev Earth Environ

634

269

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“…Stankevicius et al (2019) reported promising results from own investigations and those of Kataguiri et al (2019), Nomachi & Boscov (2016), Sharma & Hymavathi (2016), Amorim (2013), andSantos (2007) aiming at the geotechnical reuse of CDW recycled fine aggregates. 4.2.1.1 Reuse of excavated soils (Kataguiri, 2017;Kataguiri et al, 2019;Nomachi & Boscov, 2016) The investigation on the reuse of excavated soils aimed at delineating a flowchart to support screening excavated materials for different reuse options, based on current geotechnical and environmental characterization. To appeal to the end users, CDW recycling facilities and local municipalities, the flowchart was based on very simple tests and parameters.…”

Section: Construction and Demolition Wastementioning

confidence: 99%

“…In densely urbanized areas, large quantities of excavation soils can be generated due to the construction of underground garages of multi-story buildings and urban infrastructure such as subway lines, flood prevention reservoirs, and energy, gas, and water supply networks. Kataguiri et al (2019), based on studies carried out in many countries, reported that excavation soils are generally disposed of in landfills, or dumped illegally, which is also the case in the Metropolitan Area of São Paulo.…”

Section: Construction and Demolition Wastementioning

confidence: 99%

Some topics of current practical relevance in environmental geotechnics

Boscov¹,

Hemsi²

2020

S&R

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Environmental Geotechnics has been an established branch of Geotechnical Engineering for about 40 years. The contribution from Brazilian practitioners and researchers is meaningful in the many activities in this field. This paper proposes to discuss three topics of relevance to modern sustainability in Brazil, in which Geotechnicians could have an even greater involvement: expansions in MSW landfills, geotechnical confinement and other geotechnical solutions for remediation of contaminated land, and reuse of wastes as geomaterials. First, important aspects of the environmental protection system recommended for landfill expansions are described through examples, as well as the possibility of immersing geogrids to reinforce the MSW mass and increase storage capacity. Secondly, an industrial-site case study is presented to point out the additional challenges associated with site remediation at an urban region of past industrial land use and the importance of a joint regional investigation and remediation plan. The possibility of benefiting from geotechnical confinement and in situ passive remediation to treat the area also is highlighted. Finally, on the third topic, preparedness to accept working with wastes in geotechnical works is encouraged, and two investigation examples on the reuse of construction and demolition waste and water treatment sludge are presented and discussed.

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“…For decades, the utilisation of the soils and rocks of concern has been promoted with proper contamination control since large volumes of soils and rocks are usually excavated (e.g. Haid and Hammer, 2009;Katsumi, 2015;Kataguiri et al, 2019;Magnusson et al, 2019;Walsh et al, 2019). For proper utilisation, the leaching characteristics and behaviour of the soils and rocks should be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic batch leaching tests of shale rock grains

Kato

Masaki

Gathuka

et al. 2021

JGS Special Publication

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Arsenic leaching from shale rock grains was evaluated by the regulatory and modified batch leaching tests. The regulatory test was in according to the Japanese Leaching Test No. 46. The modified batch leaching tests were carried out using de-aired distilled water and eliminating headspace to simulate anaerobic conditions. The results show that dissolved oxygen (DO) in normal batch leaching tests is ~6.0 mg/L. DO can be reduced to ~2.0 mg/L by using deaired water and eliminating the headspace and shaking step. The results suggest that a pseudo anaerobic condition can be achieved by eliminating the headspace and shaking step and conducting the tests in the vacuum deaerator since the DO was very low (~1.1 mg/L). Under the pseudo anaerobic conditions, the arsenic leaching concentrations are lowest (~0.001 mg/L), implying that arsenic leaching might be suppressed under anaerobic conditions. Furthermore, these arsenic concentrations are below the regulatory standard (As < 0.01 mg/L), suggesting that the shale rock grains are environmentally safe for utilisation in geotechnical applications.

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Characterization flowchart for assessing the potential reuse of excavation soils in Sao Paulo city

Cited by 32 publications

References 31 publications

Environmental impacts and decarbonization strategies in the cement and concrete industries

Environmental impacts and decarbonization strategies in the cement and concrete industries

Some topics of current practical relevance in environmental geotechnics

Anaerobic batch leaching tests of shale rock grains

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