Seasonal Distribution and Abundance of Diatoms in Shrimp Ponds of Khulna, Bangladesh

Islam, Anisul; Naz, Sabrina; Zaman, Muhammad; Rahman, Md. Mujibor

doi:10.53808/kus.2008.9.2.0836-l

Cited by 1 publication

(1 citation statement)

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“…Moreover, though cement is an effective binder, the cost of production is significantly higher and generates significant quantities of CO 2 , which has far-reaching impacts on the environment [2,3]. The production of each ton of cement produces a total of 0.65~0.94 tons of CO 2 , where 55% is generated from the breakdown of calcium carbonate into calcium oxide (lime) and an additional 39% comes from fuel emissions [4][5][6]. The exact quantities depend on the modernity of the technology in the cement plant and the ratio of clinker to cement [7].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Influence of Banana Leaf Ash as Pozzolanic Material for the Production of Green Concrete: A Mechanical and Microstructural Evaluation

Islam,

Law,

Gunasekara

et al. 2024

Materials

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This paper reports an investigation of the mechanical and microscopic properties of partially replaced banana leaf ash (BLA) concrete. In this research, the cement was partially replaced by BLA in two phases: Phase A (0%, 5%, 10%, 15%, 20%, 25% and 30%) and Phase B (0%, 10%, 20% and 30%). The consequence of partially replacing cement with BLA in concrete was investigated by the application of a range of tests, namely X-ray fluorescence (XRF), compressive strength, splitting tensile strength, flexure strength, ultrasonic pulse velocity and scanning electron microscopy (SEM) analysis. The properties were then correlated with the properties of a standard 100% Portland cement concrete of similar strength. The XRF result of the BLA identified a composition with 48.93% SiO2 and 3.48% Al2O3, which indicates that the material potentially possesses pozzolanic properties. The mechanical properties of the partially replaced BLA concrete noted minor strength loss, approximately 5% with 20% partial replacement. The nondestructive testing data showed enhanced performance up to 20% partial replacement, with ultrasonic pulse values above 3500 m/s. The scanning electron microscopy analysis illustrated that the morphology of BLA specimens contained increased microcracks compared with the control. The decrease in strength observed is attributed to the fibrous composition of the BLA. The mechanical, nondestructive testing and microscopic results highlight the potential to utilize BLA as a partial replacement for cement as a pozzolanic material in concrete at up to 20% by weight of cement.

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