Engineering and Durability Properties of Modified Coconut Shell Concrete

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 31

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شناسه ملی سند علمی:

JR_CEJ-8-2_013

تاریخ نمایه سازی: 1 اردیبهشت 1403

چکیده مقاله:

Making low-cost concrete from coconut shell ash and coconut shell aggregate increases sustainability and reduces pollution. This research investigates untreated Coconut Shell Particles (CSP) incorporated with coconut shell ash (CSA) to improve the durability properties at elevated temperatures and in sulphuric acid. Initially, the physical and mechanical properties of cube and cylinder specimens after ۷, ۲۸, ۵۶, and ۹۰ days of moist curing were studied. The durability properties were then carried out after the pozzolanic component of CSA in modified concrete was activated. CSA and CSP were used as partial substitutes for ordinary Portland cement and coarse aggregate in class ۳۰ concrete with a constant water to cement ratio of ۰.۵۵. Concrete mixes included control, ۵% CSP, ۱۰% CSA, and a mixture of ۵% CSP incorporated with ۱۰% CSA. According to test results, adding ۱۰% of CSA to CSP concrete decreased the workability, density, and water absorption properties compared to the rest of the concrete mixes. However, these results were within acceptable limits. The compressive strength of ۱۰% CSA concrete at ۹۰ days of moist curing was reduced by ۳.۲۳% when ۵% CSP was added compared to control. The addition of ۱۰% of CSA to ۵% CSP concrete improved the split tensile strength by ۲.۷۶% higher than concrete with only ۵% CSP. Concrete containing the combination of ۱۰% CSA and ۵% CSP showed a ۹.۳۷% increment in the split tensile strength compared to concrete having only ۵% CSP after sulphuric acid exposure. Also, the compressive strength of ۱۰% CSA and ۵% CSP concrete improved by ۳۰.۷% when the temperature was elevated to ۵۰۰ °C for ۱ hour compared to the control concrete. Moreover, the reduction in the compressive strength after exposure to the elevated temperature of ۵۰۰ °C for ۱ hr. was still much less by an average of ۷۵.۳۸% compared to other waste materials blended into the concrete by previous works. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۲-۰۸-۰۲-۰۱۳ Full Text: PDF

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