Development of eco-friendly GGBS and SF based alkali-activated mortar with quartz sand

Karri, Santosh Kumar; Raju, P.; Veerni, Lakshmi

doi:10.1007/s41024-022-00235-5

Cited by 3 publications

(2 citation statements)

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“…The inclusion of low-calcium fly ash as a binder result in less strength under ambient curing conditions [4]. Curing condition plays very 2 prominent role in development of hydration and strength properties in fly ash-GGBFS alkali activated concretes [5]. Using low concentrations of NaOH instead of high levels of sodium hydroxide for concrete production can reduce the risk and cost associated with it.…”

Section: Introductionmentioning

confidence: 99%

“…Using low concentrations of NaOH instead of high levels of sodium hydroxide for concrete production can reduce the risk and cost associated with it. The NaOH solution molarity plays the prominent role in dissolution of compounds present in source materials such as alumina and silica [5,6]. Alkaline ratio (AR) plays an important role in strength development.…”

Section: Introductionmentioning

confidence: 99%

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Effect of GGBFS and fly ash proportions on fresh, tensile and cracking features of alkali activated concrete with low NaOH concentrations

Venkateswarlu,

T.D Gunneswara Rao

2024

Res. Eng. Struct. Mat.

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This study mainly investigated the tensile and cracking features of ash alkali activated concrete with different slag-fly ash proportions and low NaOH concentrations cured at ambient temperature. High-molarity NaOH leads to risk and is costly, whereas, in field conditions, heat curing is difficult. Therefore, in this study three mixes (mix-A, B and C) were developed using 0/100, 20/80, 40/60, 60/40, 80/20, and 100/0 slag-fly ash proportions in this study. Sodium hydroxide (SH) and sodium silicate (SS) were used as activators and concentrations of sodium hydroxide were used as 1M, 2M and 4M in mixes A, B and C respectively, but alkaline ratio (SS/SH) was fixed as 1.5 in all the mixes. Slump, and strength aspects (compressive, split tensile, and flexural) were evaluated. The tensile (tensile strength, tension stiffening) and cracking characteristics (crack spacing, crack width) were evaluated under uniaxial tensile loading on reinforced prismatic members. From test outcomes, workability in terms of slump of the composites decreased with increased percentage of slag or granulated blast furnace slag (GGBFS) in the total binder, but the tensile (tensile stress and tension stiffening effect) and compressive strengths increased with increasing percentage of GGBFS. Better cracking properties (i.e., minimum crack widths and reduced crack spacings) were observed when the mixes contained higher percentages of GGBFS. The obtained crack spacings were correlated with CEB-FIP model code, and existing research studies. The crack spacings obtained in this study are consistent with CEB-FIP model code. Finally, this study demonstrated that when slag-fly ash alkali activated concretes were prepared with solutions containing low NaOH concentrations and cured at room temperature (ambient), there was an increase in the strength and cracking properties with higher percentages GGBFS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%