Influence of BOF and GGBFS Based Alkali Activated Materials on the Properties of Porous Concrete

Abstract

In this study, environmentally friendly ground granulated blast furnace slag (GGBFS) based alkali activated materials and basic oxygen furnace slags (BOFs) were used as bonding materials and aggregates, respectively, to produce novel, environmentally friendly GGBFS based porous concrete. Porous concrete with a particle size of 4.75–9.5 mm and 9.5–19.00 mm was used as an aggregate. The “liquid-to-solid ratios” (L/S) variable was set at set at 0.5 and 0.6, and the “percentage of pore filling paste ratio” variable was controlled at 40%, 50%, and 60%. The curing period was set at 28 d, and the relationship between connected porosity and permeability, as well as that between unit weight and the pore filling paste ratio percentage were explored using analysis of variance. The results showed that the porous concrete had a maximum compressive strength of 8.31 MPa. The following results were obtained. An increase in percentage of pore filling paste ratio increased compressive strength. Permeability was measured at 4.67 cm/s and was positively correlated with porosity. An increase in porosity increased permeability, in which porosity was positively correlated with the percentage of pore filling paste ratio. The maximum splitting strength achieved during the 28 d was 1.46 MPa, showing a trend similar to that of compressive strength.

Alkaline Activation of Basic Oxygen Furnace Slag Modified Gold Mine Tailings for Building Material

“…Advances in Civil Engineering this study. e SG for BOFS is similar to the SG observed by Kuo et al [47], who reported a value of 3.31.…”

Synthesis and Evaluation of Geopolymer Mixtures Containing Chronologically Aged Basic Oxygen Furnace Slags

“…These exothermic and complex geopolymer reactions contain large amounts of free silicon (f-SiO 2 ). This f-SiO 2 can react with f-CaO and f-MgO in the BOFS aggregate, and hence, the formation of stable compounds such as wollastonite (CaSiO 3 ) and enstatite (MgSiO 3 ) takes place, thereby inhibiting the expansion of BOFS aggregates as shown in Equations ( 5) and ( 6) [44,81].…”

“…15, x FOR PEER REVIEW 18 of 23 high amounts of f-CaO and f-MgO limits the utilization of BOFS as an aggregate source in OPC concrete: f-CaO and f-MgO react with water at a low hydration rate and induce Ca(OH)2 and Mg(OH)2, leading to significant volume expansion[79][80][81].…”