Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Das, B.B.Subject: search.filters.subject.Durability

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    Predicting the Service Life of Reinforced Concrete by Incorporating the Experimentally Determined Properties of Steel–Concrete Interface and Corrosion
    (Springer Science and Business Media Deutschland GmbH, 2021) Sumukh, E.P.; Goudar, S.K.; Das, B.B.
    Service life of a reinforced concrete structure depends on its durability in aggressive exposure conditions. In the case of reinforced concrete structures, the phenomenon that directly affects its durability is corrosion of rebar, which has direct influence on the residual service life. Corrosion in reinforced concrete basically initiates at its weakest zone called steel–concrete interface due to its porous nature. The extent of this porous zone is being represented in terms of Porous zone thickness which has been extensively reported by various researchers. This porous zone thickness is one of the key influencing factors in the prediction of residual service life of the reinforced concrete structure. Several mathematical models were proposed by various researchers to estimate the time required for cover cracking of concrete due to rebar corrosion by assuming different values of porous zone thickness (PZT) without any systematic experimental investigation. Assuming a steady value of PZT for all kinds of concrete without any practical justification will misinterpret the predicted residual service life. In the present work, an effort has been made to evaluate an existing analytical model to predict the time to concrete cover cracking by incorporating the experimentally obtained and published data on porous zone thickness. It was found that the porous zone thickness and rate of corrosion have a major role in evaluating the residual service life of reinforced concrete structures. © 2021, Springer Nature Singapore Pte Ltd.
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    Influence of Incorporating Phase Change Materials on Cementitious System—A Review
    (Springer Science and Business Media Deutschland GmbH, 2021) Snehal, K.; Das, B.B.
    Phase change materials (PCMs) are gaining more attention in achieving the sustainability and are being widely adopted as a green building material because of their exclusive ability to store latent heat of thermal energy. PCMs have a capacity to minimize the energy loads and to provide thermal comforts in building infrastructures by its iterative cycle of absorbing and releasing the heat energy. The potential need for manipulating the heating and cooling effect in buildings is significantly increasing especially in temperature fluctuating and varied climatic regions. It is for this one of the significant reasons, PCMs are getting pronounced interest by the research fraternity in the development of a thermally effective PCM-based construction material. In this paper, attempts were made to compile the data reported by the previous researchers on the influence of incorporating PCMs in the engineering properties of cementitious system such as slump, compressive strength, flexural strength, density, porosity, water absorption, shrinkage, durability, heat of hydration, specific heat capacity and thermal conductivity. This paper also discusses the most favorable content of PCM addition and effective methods of incorporating PCMs in the cementitious system. © 2021, Springer Nature Singapore Pte Ltd.
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    Impact of Phase Change Materials on the Durability Properties of Cementitious Composites—A Review
    (Springer Science and Business Media Deutschland GmbH, 2023) Vismaya, K.; Snehal, K.; Das, B.B.
    Phase change materials (PCMs) are the novel thermal storage materials which have an ability to engross and dispel heat during the process of phase transition from solid to liquid and vice versa. Utilization of PCMs in cementitious composites has gained a lot of attention from the research fraternity to minimize the energy loadings used for space conditioning and heating in building. Impact of PCM’s presence in cementitious composites on the durability parameters is the need for its better usage. This paper gives the state of review on the influence of inclusion of phase change materials in the cementitious system on its various durability aspects. Durability properties such as porosity, water absorption, shrinkage, chloride ingression, and chemical attacks are compiled in this article. It is stated that the integration of PCM in cement composites enhances the porosity of cementitious system. Major hindrance described by the researchers is the interruption of hydration activity of cementitious system by the addition of PCM. Literature also signified that the micro/nano encapsulates PCMs and the use of highly reactive Pozzolans such as silica fume or nano-silica in conjunction with PCMs has the ability to lock up the limitations of PCMs. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.