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A. Bahurudeen – One of the best experts on this subject based on the ideXlab platform.

  • Development of Sustainable Alkali Activated Binder for Construction Using Sugarcane Bagasse Ash and Marble Waste
    Sugar Tech, 2020
    Co-Authors: Thanabalan Murugesan, R. Vidjeapriya, A. Bahurudeen

    Abstract:

    The rapid growth in the construction sector leads to high demand for construction materials and hence global research studies focus on the use of sustainable alternative materials to meet the demand. Sugarcane bagasse ash is a by-product from sugar industry and about 44,220 tonnes/day is disposed of as waste in India. Bagasse ash consists of reactive silica and can be used as a sustainable source material in alkali Activated Binder instead of disposed as a waste. Similarly, marble waste from marble processing plants can be used as an alternative for fine aggregates. Alkali-Activated concrete has high strength and durability compared to conventional cement concrete. Bagasse ash can be blended with other industrial by-products like slag to produce high quality of alkali-Activated concrete without cement. The combined effect of bagasse ash and marble waste in alkali-Activated mortar is not yet investigated. This present study focuses on the performance of bagasse ash and marble waste as a precursor and fine aggregates respectively in alkali-Activated mortar. Influence of three different molarities (6 M, 8 M and 10 M) and two curing methods (heat and ambient curing) and three levels of replacement using bagasse ash (10%, 20% and 30%) were investigated. This experimental results showed that a considerable improvement in compressive strength for bagasse ash with marble waste blended alkali-Activated mortar specimens compared to only bagasse ash blended mortar specimens. Moreover, the strength of bagasse ash blended specimens was increased with molarity. Ambient cured bagasse ash blended specimens exhibited higher strength compared to the heat cured specimens.

  • a circular framework for the valorisation of sugar industry wastes review on the industrial symbiosis between sugar construction and energy industries
    Journal of Cleaner Production, 2018
    Co-Authors: Athira Gopinath, A. Bahurudeen, Srinivas Appari, Prakash Nanthagopalan

    Abstract:

    Abstract This paper provides a comprehensive review of literature on the properties of sugar industry waste, their varied uses in energy and construction sector, performance and limitations. An efficient upcycling of sugar industry waste in energy production would help the energy sector to reduce its dependency on non-renewable fossil fuels. Literature demonstrates that in the recent years there has been an increased research interest in thermochemical conversion of sugarcane bagasse to produce cleaner energy, rather than its landfilling or combustion. On the other hand, utilisation of secondary by-products from sugar industry in the production of cement, bricks, paver blocks, Activated Binder and other construction products helps to cut down the carbon footprint of the construction industry, while improving the properties of the final products. From the perspective of the sugar industry, such an arrangement eliminates disposal problems and creates additional revenue. Although independent research studies investigating the use of sugar industry by-products exist, few studies consider these valorisation options together to minimise waste and to create an efficient material flow chain. This study identifies various material and energy recovery pathways from published literature and connects the materials and processes to form a continuous material supply chain with minimum wastage. From the findings, a symbiotic framework has been developed with primary and secondary by-products from the sugar industry serving as source materials for energy production and sustainable construction products.

  • Agro-waste ash based alkali-Activated Binder: Cleaner production of zero cement concrete for construction
    Journal of Cleaner Production, 1
    Co-Authors: Vs Athira, V Charitha, G. Athira, A. Bahurudeen

    Abstract:

    Abstract Alkali-Activated Binders are sustainable alternatives to carbon-intensive conventional cements. A comprehensive review of the potential of different agro-waste ashes and their performance as precursors in alkali-Activated Binders are essential to enable their acceptance in the construction sector. Hence, the present study focusses on a systematic review of the alkali-activation of bagasse ash, rice husk ash, corn cob ash, palm oil fuel ash, wheat straw ash, and sugarcane straw ash. Moreover, their influence on the mechanical and durability characteristics of alkali-Activated concrete is also presented. Based on the review, it is found that except for rice husk ash, all the other agro-waste ashes have almost similar silica content as that of fly ash. The morphologies of the different agro-waste ashes are found to be distinct. Incorporation of agro-waste ashes in fly ash-based Binders results in better resistance to acid attack than slag-based Binders. Addition of agro-waste ashes brought down the drying shrinkage of slag-based Binders significantly. Ambient curing is beneficial for bagasse ash-based alkali-Activated mortar specimens. Water absorption is higher for agro-waste ash based alkali-Activated Binder specimens due to the porous cellular structure of agro-waste ashes. Enhanced performance at elevated temperatures is observed for agro-waste ash based alkali-Activated Binders. Rice husk ash-based Binders are remarkably stable at elevated temperatures.

Anasua Guharay – One of the best experts on this subject based on the ideXlab platform.

  • Subgrade Stabilization Using Alkali Activated Binder Treated Jute Geotextile
    Lecture Notes in Civil Engineering, 2020
    Co-Authors: V. P. Komaravolu, Anasua Guharay, S. K. Tulluri

    Abstract:

    Many past research works proved the successful usage of synthetic geotextiles and geogrids as road subgrade reinforcement. However, reinforcing subgrades with natural geotextiles is found to be more economic and eco-friendly. The usage of this is limited by its short degradation time period in soil, and to overcome this, researchers started using treated geotextiles. In this study, a systematic lab investigation has been made to understand the behavior of subgrade strength of roads reinforced with alkali Activated Binder (AAB) treated jute geotextile. Unreinforced soils, untreated and treated jute reinforced soils are tested for CBR, bearing capacity, and the results showed a considerable increase of CBR, bearing values in treated jute geotextiles. Durability tests such as soil burial tests and tensile strengths of degraded JGT are also carried to study the increase in life expectancy of AAB treated jute geotextile. Alkali Activated Binder improves life expectancy and mechanical properties of jute, and therefore, treated jute geotextile may be used as alternative material for subgrade soil reinforcement applications.

  • Effect of Freeze–Thaw Cycles on Black Cotton Soil Reinforced with Coir and Hemp Fibres in Alkali-Activated Binder
    International Journal of Geosynthetics and Ground Engineering, 2020
    Co-Authors: Mazhar Syed, Anasua Guharay, Divyam Goel, Kunal Asati, Lin Peng

    Abstract:

    Expansive black cotton soil (BCS) is predominantly impervious and undergoes swelling and shrinkage when exposed to moisture fluctuation. This results in heaving of soil, causing it to lose its mechanical strength. Use of traditional cementitious Binders like lime and cement has a significant impact on the environment and contributes almost 7% of the global CO2 emissions. In the present study, an attempt was made to improve the geomechanical properties of BCS using envirosafe alkali-Activated Binder (AAB) with naturally available coir (CF) and hemp fibres (HF). The coir and hemp fibres were chemically treated to improve their durability. AAB was prepared by blending an alkali activator solution of sodium silicate and sodium hydroxide with class F fly ash at 0.4 water to solid ratio. This study also investigated the effectiveness of coir and hemp fibre reinforced AAB–BCS at different freeze–thaw cycles. The influence of varying dosages of fibres and freeze–thaw cycles in AAB-treated BCS showed a significant improvement in soil tensile strength and durability. The microstructural and geomechanical results of treated fibres showed higher serviceability and tensile resistance compared to the untreated ones. Furthermore, nonlinear regression equations were also proposed to relate experimental test results with model-predicted results in terms of unconfined compressive strength and indirect tensile strength.

  • Effect of natural fiber reinforcement on strength response of alkali Activated Binder treated expansive soil: Experimental investigation and reliability analysis
    Construction and Building Materials, 2020
    Co-Authors: Mazhar Syed, Anasua Guharay

    Abstract:

    Abstract Expansive soil possesses high swelling-shrinkage potential owing to moisture instability, resulting in loss of geomechanical strength. In this study, an effort is made to improve the shear strength properties of expansive soil by combined effects of alkali Activated Binder (AAB) with chemically treated hemp (THF) and coir fiber (TCF). AAB is produced by the reaction between alkaline Binder of sodium silicate and sodium hydroxide in aluminosilicate precursors of Class-F fly ash and slag at various proportions. The effect of varying dosages of THF, TCF, and slag/fly ash ratio in the AAB soil mixture on compressive shear, tensile, and flexural strength is evaluated through a series of geotechnical characterization tests. It is observed that THF-AAB-soil shows higher interfacial bonding with strong interlocking density and tensile cracking resistance compared to TCF. Furthermore, in order to effectively consider the uncertainties associated with the design of subgrade for foundations, reliability indices against unconfined compressive strength and split tensile strength are predicted using Monte Carlo simulation through a non-linear regression model developed from experimental results. The study shows that the optimum dosages of fly ash-slag and fiber reinforcement are essential factors for controlling the swelling of expansive soil as well as improving its tensile strength.

Jinhong Zhang – One of the best experts on this subject based on the ideXlab platform.

  • Effects of activator type/concentration and curing temperature on alkali-Activated Binder based on copper mine tailings
    Journal of Materials Science, 2012
    Co-Authors: Saeed Ahmari, Lianyang Zhang, Jinhong Zhang

    Abstract:

    This article investigates the effects of activator type/concentration and curing temperature on alkali-Activated Binder based on copper mine tailings (MT). Different alkaline activators including sodium hydroxide (NaOH), sodium silicate (SS), and sodium aluminate (SA) at different compositions and concentrations were used and four different curing temperatures, 60, 75, 90, and 120 °C, were considered. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX), and X-ray diffraction (XRD) were conducted to investigate the effect of these factors on the unconfined compressive strength (UCS), microstructure, and phase composition of the Binder. The results indicate that NaOH concentration and curing temperature are two important factors that affect the UCS and micro-structural properties of the alkali-Activated MT Binder. The optimum curing temperature, i.e., the curing temperature at the maximum UCS, depends on the NaOH concentration, lower optimum curing temperature at smaller NaOH concentration. Addition of aqueous SS to the NaOH solution can lead to strength improvement, with the highest UCS obtained at a SiO_2/Na_2O ratio of 1.0–1.26. Addition of powder SA to the NaOH solution profoundly delays the setting at 60 °C but improves the UCS at 90 °C. The SEM/EDX results show highly heterogeneous microstructure for the alkali-Activated MT Binder as evidenced by the variable Si/Al ratios in different phases. The XRD patterns indicate a newly formed crystalline phase, zeolite, in the 90 °C-cured specimens. The results of this study provide useful information for recycling and utilization of copper MT as construction material through the geopolymerization technology.

  • effects of activator type concentration and curing temperature on alkali Activated Binder based on copper mine tailings
    Journal of Materials Science, 2012
    Co-Authors: Saeed Ahmari, Lianyang Zhang, Jinhong Zhang

    Abstract:

    This article investigates the effects of activator type/concentration and curing temperature on alkali-Activated Binder based on copper mine tailings (MT). Different alkaline activators including sodium hydroxide (NaOH), sodium silicate (SS), and sodium aluminate (SA) at different compositions and concentrations were used and four different curing temperatures, 60, 75, 90, and 120 °C, were considered. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX), and X-ray diffraction (XRD) were conducted to investigate the effect of these factors on the unconfined compressive strength (UCS), microstructure, and phase composition of the Binder. The results indicate that NaOH concentration and curing temperature are two important factors that affect the UCS and micro-structural properties of the alkali-Activated MT Binder. The optimum curing temperature, i.e., the curing temperature at the maximum UCS, depends on the NaOH concentration, lower optimum curing temperature at smaller NaOH concentration. Addition of aqueous SS to the NaOH solution can lead to strength improvement, with the highest UCS obtained at a SiO2/Na2O ratio of 1.0–1.26. Addition of powder SA to the NaOH solution profoundly delays the setting at 60 °C but improves the UCS at 90 °C. The SEM/EDX results show highly heterogeneous microstructure for the alkali-Activated MT Binder as evidenced by the variable Si/Al ratios in different phases. The XRD patterns indicate a newly formed crystalline phase, zeolite, in the 90 °C-cured specimens. The results of this study provide useful information for recycling and utilization of copper MT as construction material through the geopolymerization technology.