دانلود رایگان مقاله توسعه کامپوزیت سیمان صفر برای محافظت از لوله های فاضلاب بتونی در برابر خوردگی – سال 2021
مشخصات مقاله:
عنوان فارسی مقاله:
توسعه کامپوزیت سیمان صفر برای محافظت از لوله های فاضلاب بتونی در برابر خوردگی
عنوان انگلیسی مقاله:
Development of zero cement composite for the protection of concrete sewage pipes from corrosion and fatbergs
سال انتشار مقاله:
2021
کلمات کلیدی مقاله:
نانو سیلیس، سرباره، خاکستر مگس، خوردگی بتن، چربی های چربی، لوله های فاضلاب بتونی
مناسب برای رشته های دانشگاهی زیر:
مهندسی عمران
مناسب برای گرایش های دانشگاهی زیر:
مدیریت ساخت و سازه
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
1. Introduction
2. Materials and methodology
2.1. Materials
2.2. Methodology
2.2.1. Chemical and mineral composition of ordinary portland cement, slag, fly-ash and nano silica
2.2.2. Concrete mix designs
2.2.3. Experimental program
3. Results and discussion
3.1. X-ray diffraction and thermogravimetric analysis
3.2. Scanning electron microscopic analysis
3.3. Compressive strength analysis
3.4. Concrete acid attack analysis
4. Conclusions and recommendations for future work
CRediT authorship contribution statement
Declaration of Competing Interest
Acknowledgements
References
قسمتی از مقاله انگلیسی:
ABSTRACT
The pursuit of environmental friendly alternatives for ordinary Portland cement (OPC) finds increased attention when the latter poses serious durability issues in major infrastructure applications, such as sewage drainage pipes. The presence of large quantities of free lime in OPC concrete used in the manufacturing of sewage pipes, exposes them to (i) concrete corrosion in acidic sewage environment, and (ii) clogging of sewage network due to the formation of calcified fatbergs. There appears to be very limited or no research on the development of an ecofriendly zero cement composite that can protect the concrete sewage pipes from corrosion and can eliminate the free lime that contributes towards the formation of fatbergs. Therefore, to address this research gap, an experimental investigation was undertaken on quaternary blended cement composites containing nano-silica, flyash, slag, and hydrated lime. These cement composites were tested for compressive strength to identify their mechanical properties, and an acid attack durability test exposed to 3.5% sulfuric acid solution to identify their corrosion performance in an aggressive acid environment. X-ray diffraction, thermogravimetric and scanning electron microscopic analysis were carried out to ascertain the physicochemical properties of the cement composites. The results show that an eco-friendly zero cement concrete developed with a quaternary blended mix of nano-silica, fly-ash, slag and hydrated lime successfully addresses the mechanical and durability requirements of the concrete sewage pipes. It surpasses ASTM’s minimum strength requirement for the sewage pipes, and brings about a significant improvement in withstanding an aggressive acidic environment as evident from the 96% reduction in its mass loss due to concrete corrosion, compared to that of the OPC concrete. Moreover, the high amorphous silica content present in nano silica, slag and fly-ash assists in totally consuming the free lime that interacts with fat, oil and grease to produce fatbergs.
