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Showing 1 to 20 of 150 for “"carbonation"”.
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Accelerated carbonation of hazardous wastes
Accelerated carbonation involves exposing a material to a concentrated atmosphere of carbon dioxide, and can be used to treat hazardous wastes and soils and create new construction materials. The present work examines the use of accelerated carbonation to reduce the hazardous properties of wastes …
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CO2 Sequestration through Mineral Carbonation
Anthropogenic greenhouse gas emissions have become a subject of increasing concern because of their association with global climate change. Carbon dioxide (CO2) is the most prevalent anthropogenic greenhouse gas, and hence reduction of CO2 concentration in the atmosphere has become an important …
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Carbonation of Functionally Graded Concrete
In this thesis, the carbonation of functionally graded concrete is investigated through a combination of experimental and analytical approaches. The properties of functionally graded concrete vary throughout the cross-section to satisfy performance requirements in a resource-efficient manner. In …
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Research in CO2 reduction by carbonation
… a carbonator and a calciner as part of a carbonation cycle for carbon capture in two and three dimensions. Carbon capture technologies show promise and many countries are developing or planning power plants incorporating carbon capture and storage (CCS) as a means of reducing their CO2 …
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Accelerated carbonation of wastes and minerals
Accelerated carbonation technology (ACT) could be used for the stabilisation of hazardous wastes, remediation of contaminated soils and re-use/recycling of various waste streams. ACT has also potential for storing anthropogenic CO2 emissions into mineral silicates and alkaline waste residues via …
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Accelerated carbonation of municipal solid waste incineration residues
… waste incinerator (MSWI) residues by accelerated carbonation is investigated and compared with naturally aged ashes. Both bottom ash and APC residues were carbonated in an atmosphere composed of gaseous CO2. It was found that the carbonation of calcium oxides/hydroxides resulted in the rapid …
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Concrete carbonation prediction for varying environmental exposure conditions
… processes (Alexander et al., 1999a). Carbonation of concrete is governed, inter alia, by the microstructure and the transport characteristics of the concrete. A carbonation model with permeability coefficient (k) from the Oxygen Permeability Index (OPI) test as the key material …
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Raman imaging of cementitious carbonation: A spatio-temporal investigation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Carbonation and permeability characteristics of modern South African concretes
… concerns within the construction industry. Carbonation is considered as of the main causes contributing to the corrosion phenomenon. The carbonation mechanism entails the reaction between atmospheric carbon dioxide and the cement paste and leads to an altered chemistry within concrete, which …
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Carbonation of concrete bridge structures in three South African localities
The rate of carbonation for the localities of the Cape Peninsula, Durban (i.e. Durban - KwaZulu Natal South Coast) and Johannesburg (i.e. the motorway system and between Heidelberg Road and Geldenhuis interchanges on the N3 freeway) were studied in order to derive carbonation prediction models for …
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Methods of remedial treatment for carbonation-induced corrosion of reinforced concrete
The importance of carbonation-induced corrosion has grown in recent years owing to the increasing age of reinforced concrete structures. Among the various remedial treatments for the alleviation of the deterioration process, applications of corrosion inhibitors and surface coatings are highlighted …
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Effect of carbonation on bound chlorides in cementitious and alkali activated binders
… property to resist the chloride corrosion. Carbonation induced corrosion of steel bars is another common deterioration mechanisms in concrete, especially in structures exposed to urban/industrial environments. Carbonation is a two-part process, involving transport and reaction. CO2 from the …
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A Practical Carbonation Model for Service Life Design of Reinforced Concrete Structures
… on the subject and models developed to predict carbonation in concrete structures. Despite the large amount of resources and research effort put into developing these models, the translation from theory to practice represents a great challenge for design engineers in the field of durability …
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Assessment and prediction of chloride ingress and carbonation in patch repair mortars
… Relevant performance requirements, such as carbonation resistance and chloride resistance, are usually not considered despite the fact that they have a direct influence on the durability performance of concrete repair mortars. The widespread premature failure of patch repairs which meet the …
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The effect of carbonation on creep and shrinkage on Portland cement concrete
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Building Engineering and Construction, 1961.
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Durability of alkali-activated calcined clay - GGBFS concrete against carbonation and chloride diffusion
… tests assessing the performance in chloride and carbonation-rich environments. The results show that the inclusion of GGBFS as a rich calcium source, notably improves the mortar microstructure and increases the pH of the pore solution, enhancing the carbonation resistance. Concretes activated …
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