fib YMG Webinar featuring Dr. Eng. Januarti Jaya Ekaputri
Last chance to sign up for today's fib YMG webinar featuring Dr. Eng. Januarti Jaya Ekaputri on the “Application of microbes to improve the performance of high-volume coal ash concrete”! Register now.
Application of high volume coal ash in concrete incorporated with bacteria is one of the efforts to utilize coal ash as well as increasing concrete performance and heal the concrete cracks. The combination of fly ash replacing cement, bottom ash replacing sand, and bacteria from sporosarcina pasteurii to boost concrete performance is presented. To increase the reactivity of fly ash at the early age, an alkali solution of 0.03M using sodium hydroxide was applied as a part of water in the mixture. The sequence of casting plays an important role to the workability and concrete strength. Bottom ash contributes to the internal curing during hydration reaction to guaranty the chemical/biological process in concrete. As a result, concrete strength and hydration temperature decreases as fly ash content increases. Fresh concrete workability was negatively impacted as fly ash content increases on samples without bacteria added, but positively impacted on samples with additional bacteria.