An integrated methodology for structural performance of high-volume fly ash concrete beams using hybrid fibers

Strength and Durability Properties of High-Volume Fly Ash (HVFA) Binders: A Systematic Review

“…While most authors seem to argue that optimum strength is achieved between 50-60% FA, it is clear from Table 1 that recent research indicates the possibility of almost similar results for FA dosages within the range of 70-80% FA [7,28]. Swathi and Asadi (2020) [19] observed that the optimum split tensile strength is obtained when 50% FA is used in HVFA binders (see Figure 1 above). It was reported that at 90 days, 50% yielded a split tensile strength of 6.23 MPa and started decrement thereafter [24,25].…”

“…In their review, they focus on concrete and the characteristics of FA [17]. Swathi and Asadi (2022) [18,19] experimentally investigated the mechanical strength and durability of HVFA (70%wt) to understand the performance, and microstructure characteristics using the rapid chloride penetration, water absorption, and sorptivity tests. Other reviews are brief in nature, summarizing, and do not necessarily focus on HVFA.…”

“…Further, most studies are limited to dosages between 50-60% with very few seldom exceeding 80% FA dosages. Swathi and Asadi (2020) [19] observed that the optimum split tensile strength is obtained when 50% FA is used in HVFA binders (see Figure 1 above). It was reported that at 90 days, 50% yielded a split tensile strength of 6.23 MPa and started decrement thereafter [24,25].…”

“…Generally, any value lower than 2000 coulombs depicts high chloride resistance, a value of 2000 to 4000 coulombs indicates medium resistance, and a value higher than 4000 coulombs depicts lower resistance [37,65]. Swathi and Asadi (2020) [19] observed the passage of Cl − through mortar specimens of FA content ranging from 0% to 70% over 28 days of curing. They noted the least passage of Cl − in binder samples of 50% FA by weight at 1458 coulombs compared with binders containing 0, 25, and 70% FA.…”