Equivalent CO2 Emission and Cost Analysis of Green Self-Compacting Rubberized Concrete

Sustainability

Musa Adamu¹  Abubakar Mohammed¹  Sylvia E. Kelechi¹  Hani Alanazi²  Ifeyinwa I. Obianyo³  Yasser E. Ibrahim⁴ 

[1] Department of Civil Engineering, Bayero University, P.M.B. 3011, Kano 700006, Nigeria;Department of Civil and Environmental Engineering, College of Engineering, Majmaah University, Al-Majmaah 11952, Saudi Arabia;Department of Materials Science and Engineering, African University of Science and Technology, Abuja 900109, Nigeria;Engineering Management Department, College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia;

关键词: crumb rubber;    calcium carbide residue;    fly ash;    self-compacting concrete;    CO₂ emission;    environmental sustainability;   

DOI  :  10.3390/su14010137

来源: DOAJ

【 摘 要 】

Global warming and climate changes are the major environmental challenges globally. With CO₂ emission being one of the main greenhouse gases emitted to the environment, and cement and concrete production amounting to about 10% of the global CO₂ emission, there is a need for the construction industry to utilize an environmentally sustainable material as an alternative to cement. This study analyzed the cost, CO₂ emission and strength properties of green self-compacting concrete (SCC) ternary blend containing fly ash, calcium carbide residue (CCR), and crumb rubber (CR) as a replacement material by volume of cement, cementitious material, and fine aggregate, respectively. Cement was replaced with fly ash at 0% and 40% by volume. CCR was used as a replacement at 5% and 10% by volume of cementitious materials, CR replaced fine aggregate in proportions of 10% and 20% by volume. The result indicated that the mix with 0% fly ash and 20% CR replacement of fine aggregate was the most expensive and had the highest CO₂ emission. However, the mix with 10% CR, 40% fly ash, and 10% CCR had the lowest CO₂ emission and was therefore the greenest SCC mix. The 28-day maximum compressive strength of 45 MPa was achieved in a mix with 0% CR, 0% fly ash, and 10% CCR, while the utmost 28-day splitting tensile strength of 4.1 MPa was achieved with a mix with 10% CR, 0% fly ash, and 5% CCR, and the highest flexural strength at 28 days was 6.7 MPa and was also obtained in a mix with 0% CR, 0% fly ash, and 5% CCR. In conclusion, a green SCC can be produced by substituting 40% cement with fly ash, 10% fine aggregate with CR, and 10% CCR as a replacement by volume of cementitious material, which is highly affordable and has an acceptable strength as recommended for conventional SCC.

【 授权许可】

Unknown