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A platform for research: civil engineering, architecture and urbanism
Mechanical and Durability Properties of Alkali Activated Concrete Incorporating Recycled Aggregates
Buildings made of concrete have been proven to be safe and durable. Concerns over global warming and carbon emissions have grown in recent years. The construction sector, particularly cement manufacturing, accounts for a significant portion of worldwide CO2 emissions. Cement manufacturing is said to be responsible for 5–8 per cent of global CO2 emissions. It is observed that alkali activated concrete has good strength and chemical resistance. As we know that aggregates occupy 60–75% of the volume in concrete, so to overcome this problem, recycled aggregate can be used by improving its essential properties. Recycled aggregates are produced from processing previously used building materials such as construction and demolition of building waste. This study was undertaken to compare M30 grade alkali activated concrete (AAC) and ordinary concrete (OC). Exploratory experiments were conducted incorporating recycled aggregate (RA) to replace coarse aggregate with 10, 20, 30, and 40% in concrete. Mechanical properties including compressive strength, split tensile strength, flexural strength, modulus for elasticity, and durability properties such as sulphate attack, chloride attack, water impermeability, and RCPT after 28 days of curing has been compared. Mechanical properties of both concrete decrease as the proportion of recycled aggregate increases. Comparison of AAC and OC shows that at 40% replacement of natural aggregate with RA, there is marginal change in compressive strength at 28 days. However there is sharp decrease in flexural strength, in AAC compared to OC at all levels of replacement. Decrease in split tensile strength and modulus of elasticity is not more when OC and AAC are compared. AAC offers poor durability, such as high water absorption because of more voids present in it, surface cracking, and high chloride penetration compared to OC when incorporated with RA. Hence AAC with RA can be used for non-structural work like paver blocks or road furniture which is not subjected to aggressive environments but can be produced on mass scale. As AAC utilises industrial waste it is environment friendly and also less costly compared to OC.
Mechanical and Durability Properties of Alkali Activated Concrete Incorporating Recycled Aggregates
Buildings made of concrete have been proven to be safe and durable. Concerns over global warming and carbon emissions have grown in recent years. The construction sector, particularly cement manufacturing, accounts for a significant portion of worldwide CO2 emissions. Cement manufacturing is said to be responsible for 5–8 per cent of global CO2 emissions. It is observed that alkali activated concrete has good strength and chemical resistance. As we know that aggregates occupy 60–75% of the volume in concrete, so to overcome this problem, recycled aggregate can be used by improving its essential properties. Recycled aggregates are produced from processing previously used building materials such as construction and demolition of building waste. This study was undertaken to compare M30 grade alkali activated concrete (AAC) and ordinary concrete (OC). Exploratory experiments were conducted incorporating recycled aggregate (RA) to replace coarse aggregate with 10, 20, 30, and 40% in concrete. Mechanical properties including compressive strength, split tensile strength, flexural strength, modulus for elasticity, and durability properties such as sulphate attack, chloride attack, water impermeability, and RCPT after 28 days of curing has been compared. Mechanical properties of both concrete decrease as the proportion of recycled aggregate increases. Comparison of AAC and OC shows that at 40% replacement of natural aggregate with RA, there is marginal change in compressive strength at 28 days. However there is sharp decrease in flexural strength, in AAC compared to OC at all levels of replacement. Decrease in split tensile strength and modulus of elasticity is not more when OC and AAC are compared. AAC offers poor durability, such as high water absorption because of more voids present in it, surface cracking, and high chloride penetration compared to OC when incorporated with RA. Hence AAC with RA can be used for non-structural work like paver blocks or road furniture which is not subjected to aggressive environments but can be produced on mass scale. As AAC utilises industrial waste it is environment friendly and also less costly compared to OC.
Mechanical and Durability Properties of Alkali Activated Concrete Incorporating Recycled Aggregates
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Patel, Bhavya (author) / Thakkar, Sonal (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 83 ; 1235-1250
2024-02-06
16 pages
Article/Chapter (Book)
Electronic Resource
English
| TIBKAT | 2022
| British Library Online Contents | 2015