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Sudha Uthaman

Bio: Sudha Uthaman is an academic researcher from Sathyabama University. The author has contributed to research in topics: Fly ash & Cement. The author has an hindex of 4, co-authored 9 publications receiving 79 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the nano-titania and nano-calcium carbonate at 2% by weight of cement were added to fly ash concrete to increase the pozzolanic activity resulting in faster hydration, early-age strength and long-term compressive and split tensile strength.

56 citations

Journal ArticleDOI
TL;DR: In this article, a method for enhancing the corrosion resistance of reinforcements through nanophase modification of fly ash concrete is presented, which can prevent diffusion and movement of chloride ions to surface of the rebar and thereby maintain the passivity of the thin iron oxide layer around the steel rebar.

36 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this paper, the importance of manufacturing green concrete using recycled waste materials and nanoparticles with its advantage and scope is discussed in detail, where the authors also discuss the potential of green concrete mix for commercialization by providing developers and contractors with an alternative concrete.
Abstract: The manufacture of cement contributes to about 8%–10% of CO2 emission and globally increases the temperature of the environment. The development of sustainable green concrete by recycling the waste materials minimizes the usage of natural resources used for cement and concrete production and reduces its adverse effect on the environment. There are numerous waste materials from different industries and agriculture which are disposed as landfills, without the knowledge of recycling the materials. To reduce the consumption of raw materials during cement production and other natural resources used during the concrete casting, these waste materials should be replaced in the concrete mix. The selection of materials for concrete mix would be based on the materials performance and cost. The new research trend showed the importance of nanotechnology by replacing existing materials with nanoparticles or nanomaterials. This will lead to the development of eco-friendly Green Concrete as a stronger and more durable concrete. This green concrete mix will have potential for commercialization, by providing developers and contractors with an alternative concrete. In this chapter, the importance of manufacturing Green Concrete using recycled waste materials and nanoparticles with its advantage and scope will be discussed in detail.

26 citations

Journal ArticleDOI
TL;DR: The major cause of concrete corrosion is carbonation where atmospheric carbon dioxide (CO2) penetrates the concrete structure and deteriorates it as discussed by the authors, which is a major cause for concrete corrosion.

13 citations

Journal ArticleDOI
TL;DR: The enhanced properties of fly ash concrete against sulfate attack could be achieved with less C3A content thus reducing the available Ca(OH)2 and reducing the possibility of development of deleterious ettringite and gypsum.
Abstract: Sulfate attack on concrete structures is a major durability concern wherein concrete interacts with marine water, swamp water, groundwater, sewage water, freshwater, etc. In this study, the supplementary cementitious materials such as fly ash (FA) and nanoparticles are together incorporated into conventional concrete aiming to enhance the resistance of concrete against the penetration of sulfates. The present work is focused to understand the degradation in FA concrete modified with nanoparticles by surface sulfate attack. Concrete mix such as FA and FA modified with 2 wt% nano-TiO2 (FAT), nano-CaCO3 (FAC), and 1:1 ratio of nano-TiO2 to nano-CaCO3 (FATC) was fabricated. The specimens were exposed in 3% of ammonium and sodium sulfate for 90 days. The deterioration effects and changes in microstructural properties in all the specimens were comparatively studied. Results showed FAT, FAC, and FATC concrete have been deteriorated in ammonium and sodium sulfate solution compared with FA concrete. Partial replacement of cement with fly ash decreases the quantity of freely available reactive aluminates. Consumption of free lime by the fly ash prevents to react with sulfate. The enhanced properties of fly ash concrete against sulfate attack could be achieved with less C3A content thus reducing the available Ca(OH)2 and reducing the possibility of development of deleterious ettringite and gypsum.

8 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the effects of marine environment on the deterioration mechanism, performance, and durability of concrete materials and structures are systematically reviewed, and prospectives are proposed for practical applications on concrete under marine environment.
Abstract: Durability deterioration of cementitious concrete and reinforced concrete (RC) is critical to durability, safety, and sustainability of infrastructures, especially for offshore concrete structures under marine environment. In this paper, the effects of marine environment on the deterioration mechanism, performance, and durability of concrete materials and structures are systematically reviewed. For the deterioration mechanism, the effect of various chemicals in seawater and different marine exposure zones on the cementitious concrete and reinforced concrete is firstly analyzed and compared. At material level, this paper discusses the characterizations of cementitious concrete, including compressive strength, chloride diffusion, carbonation depth, and pore structure. On the other hand, the performance of cementitious concrete with the addition of supplementary cementitious materials was also compared when exposed to marine environment. At structure level, the durability of RC structures, including beams and slabs and other elements with corrosion protection under marine environment is evaluated. This paper also assesses some cases studies of RC structures after many years of exposure to marine environment. Furthermore, prospectives are proposed for practical applications on concrete under marine environment. The conclusions are of great benefit to the researchers and engineers in the concrete-related industry who aim to develop durable and sustainable concrete infrastructures under marine environment.

104 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed to use out-of-service ballast and sleepers for use as aggregates for constructing the slab track, which is replacing obsolete ballasted track.

48 citations

Journal ArticleDOI
TL;DR: In this article, a novel high performance green concrete fabricated by incorporating fly ash, nanoparticles and corrosion inhibiting admixture into conventional M45 grade concrete is reported, which is very promising not only for cost reduction and improved properties of concrete structures, but also reduces energy consumption and green house gas emissions.

47 citations

Journal ArticleDOI
Ai Zhang1, Yong Ge1, Wencui Yang1, Xiaoping Cai1, Yuanbo Du1 
TL;DR: In this article, the effects of nano-SiO2 (NS), nano-Fe2O3 (NF) and nano-NiO (NN) on hydration and microscopic properties of white cement were investigated.

45 citations

Journal ArticleDOI
TL;DR: In this article , the authors evaluated the mechanical, durability, and microstructural properties of FA-based concrete and identified potential solutions to the constraints and directed future research toward the application of FA in higher amounts.
Abstract: This study aimed to expand the knowledge on the application of the most common industrial byproduct, i.e., fly ash, as a supplementary cementitious material. The characteristics of cement-based composites containing fly ash as supplementary cementitious material were discussed. This research evaluated the mechanical, durability, and microstructural properties of FA-based concrete. Additionally, the various factors affecting the aforementioned properties are discussed, as well as the limitations associated with the use of FA in concrete. The addition of fly ash as supplementary cementitious material has a favorable impact on the material characteristics along with the environmental benefits; however, there is an optimum level of its inclusion (up to 20%) beyond which FA has a deleterious influence on the composite’s performance. The evaluation of the literature identified potential solutions to the constraints and directed future research toward the application of FA in higher amounts. The delayed early strength development is one of the key downsides of FA use in cementitious composites. This can be overcome by chemical activation (alkali/sulphate) and the addition of nanomaterials, allowing for high-volume use of FA. By utilizing FA as an SCM, sustainable development may promote by lowering CO2 emissions, conserving natural resources, managing waste effectively, reducing environmental pollution, and low hydration heat.

39 citations