Development of One-Part Alkali Activated Slag/Fly Ash Binders
The One-part alkali-activated binders or just-add-water concept have received attention due to their advantages over two-part alkali-activated binders.By avoiding the use of dangerous alkali solutions, these binders are easy to handle and transport.Ground granulated blast furnace slag is one of the side streams, which can be used in alkali-activated binders to achieve high compressive strength at the early age.However, there are some negative aspects in using slag alone, including fast setting time and high drying shrinkage.Fast setting time narrows down the application of the mix compositions and high drying shrinkage causes the crack formation, and therefore shortens service life.Fly ash can be used in one-part alkali-activated materials to partially substitute slag in order to minimize drying shrinkage and prolong the setting time.No investigation has been conducted on the fresh and hardened properties of theses hybrid blends.Here, this paper presents new research results on the effects of replacing slag with fly ash up to 70% on fresh and hardened properties of one-part alkali activated slag/fly ash mortars.These properties were characterized by the initial and final setting time, strength development (compressive and flexural), and the rate of drying shrinkage.The results confirmed the advantages of using fly ash in reducing the drying shrinkage and prolonging the setting time.The lower mechanical properties caused by decreasing the amount of slag is still high enough to be considered in the construction applications.
One-part alkali activated binders Slag Fly ash Compressive strength Dry shrinkage
Z.Abdollahnejad T.Luukkonen M.Mastali P.Kinnunen M.Illikainen
Fibre and Particle Engineering, Faculty of Technology, Univ.of Oulu, P.O.Box 4300, 90014 Oulu, Finland
国际会议
福州
英文
469-474
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）