Application of High-Fly Ash Self-compacting Concrete in Sidewalk Construction in Hanoi City

This article presents the findings of a study on the application of high-fly ash self-compacting concrete (SCC) in sidewalk construction projects in Hanoi, Vietnam. The study focuses on evaluating the mechanical properties, including compressive strength, tensile strength, abrasion and imper-meability of high-fly ash SCC, with a high-fly ash content comprising up to 60% of the total powder mass. A comparison is made between high-fly ash SCC and conventional concrete (CC) of equal compressive strength. The findings reveal that high-fly ash SCC exhibits a 14% increase in tensile strength, a marginally lower abrasion of approximately 1.29%, and attains a water penetration resistance rating of B10, surpassing conventional concrete that achieves B8. Furthermore, the study underscores the economic viability and environmental benefits of employing SCC with a high fly ash content in sidewalk construction within Hanoi. Material costs, construction expenses, and CO2 emissions associated with SCC production are found to be 8.11%, 12.28%, and 40.63% lower than those of CC, respectively. The adoption of SCC not only contributes positively to environmental conservation but also offers economic and technical advantages to the construction sector in Vietnam.