Evaluation of reactivity indexes and durability properties of slag-based geopolymer concrete incorporating corn cob ash

Oyebisi, Solomon; Ede, A. N.; Olutoge, Festus; Ogbiye, Samuel

doi:10.1016/j.conbuildmat.2020.119604

Cited by 39 publications

(8 citation statements)

References 56 publications

(135 reference statements)

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“…The impact of both A and B on the resisting performance of concrete against deflection depends on the C and T. Still, there was no significant interaction effect between C × T on the yield of fr because P-value = 0.173 was higher than 0.05. On the other hand, as shown in Table 7, the F-value for all significant terms was greater 5; this also confirmed that the model terms were substantial [36] to the yield of flexural strength. Finally, the model yielded no lack-of-fit or pure error because both linear and interaction terms were significant and included in the model.…”

Section: Analysis Of Response Surface Designsupporting

confidence: 72%

Flexural optimization of slag-based geopolymer concrete beams modified with corn cob ash

2021

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This study investigated the flexural strength of geopolymer concrete (GPC) beams produced with ground granulated blast furnace slag (GGBFS) and corn cob ash (CCA). The design of experiment (DOE), Box-Behnken design (BBD) of the response surface methodology (RSM), was used to optimize the strength. GGBFS was replaced at 0, 20, and 40 wt. % of CCA. The mixes were activated with 14 molar concentration (14 M) of both sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions. The mix design properties such as alkaline liquid to binder ratio, binder to aggregate ratio, binder ratio, and curing time were statistically applied as continuous (independent) variables to optimize the response factor (flexural strength). Compared with the control sample (Portland cement concrete), GPC exhibited higher compressive and flexural strengths at up to 40 wt. % of CCA replacement. The models predicted the response of flexural strength with less than 5% variability. Besides, the correlation between the experimental and the optimized flexural strength yielded a high precision with 99.6% "R 2 ". Therefore, this study's response models would be advantageous in the optimization of mix design proportions for obtaining target flexural strength of GPC beams produced with GGBFS and CCA.

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Section: Analysis Of Response Surface Designsupporting

confidence: 72%

Flexural optimization of slag-based geopolymer concrete beams modified with corn cob ash

2021

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“…This is associated with a greater exposure to the conditions of internal pore saturation and drying, in a continuous and abrupt way of the geopolymeric matrix, which is a common and expected behavior in most materials submitted to the cycling under these conditions 43 . Thermal curing reduces mass loss in almost all situations, which is due to a greater internal consolidation of the precursor materials during the geopolymerization reactions, which are enhanced by curing at higher temperatures 44 . Another associated factor is that the environment cure is influenced by other variables, such as external humidity and microorganisms present in the atmosphere, which help to compromise the integrity of the reactive process, contributing to confirm the worse performance of this type of cure for geopolymeric materials 45 .…”

Section: Resultsmentioning

confidence: 99%

“…43 Thermal curing reduces mass loss in almost all situations, which is due to a greater internal consolidation of the precursor materials during the geopolymerization reactions, which are enhanced by curing at higher temperatures. 44 Another associated factor is that the environment cure is influenced by other variables, such as external humidity and microorganisms present in the atmosphere, which help to compromise the integrity of the reactive process, contributing to confirm the worse performance of this type of cure for geopolymeric materials. 45 As tiles materials are highly exposed to conditions of adverse durability actions, with the occurrence of rain and sun on behavior and the ceramic properties of these clays particularly in the Sejnène region, northwest Tunisia.…”

Section: Durability Testing and Economic Evaluationmentioning

confidence: 99%

Circular economy and durability in geopolymers ceramics pieces obtained from glass polishing waste

Azevedo¹,

Marvila²,

Oliveira³

et al. 2021

Int J Applied Ceramic Tech

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The development of new building materials based on alkaline activation technology is very promising, mainly linked to products that need significant technological properties and durability due to their adverse service conditions and environmental exposure. The objective of this research was to evaluate the development of a circular economy within the scope of durability of ceramic pieces incorporating glass polishing waste aimed at the production of roof tiles, obtained by the geopolymerization process. Two methodologies to evaluate the sample's durability were studied: wetting and drying cycles; and exposure to salt spray; both simulating conditions that tiles typically face in normal conditions. Prismatic specimens were made with an alkaline solution/(metakaolin + waste) ratio = 0.26; a SiO2/Al2O3 molar ratio = 3.5, 4, and 4.5; and with ambient and thermal cure at 7 days. Samples were evaluated in their mechanical strength, mass loss, and water absorption. Results showed that the SiO2/Al2O3 = 4.0 ratio with thermal curing had the best behavior in aggressive conditions, and therefore, this formulation can be used for the production of tiles.

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“…There was about 22, 47, 59, 79, and 82 % increase in calcium counts in SCC10, 90, SCC20, 80, SCC30,70, SCC40, 60, and SCC50, 50 compared with the control, SCC0, 100. The calcium present in IFS is tied up as calcium silicate, calcium aluminate, and calcium aluminosilicate, hence reason for higher calcium counts [22]. During the pozzolanic reaction, samples with IFS are virtually impermeable to oxygen in normal environment, hence reduced the silica and increased the ferrite and resulted mostly in calcium aluminoilicate hydrate [11].…”

Section: Microstructural Characteristics Of Sccsmentioning

confidence: 99%

Effects of Induction-Furnace Slag on Strength Properties of Self-Compacting Concrete

Mark

Ede

Arum

et al. 2021

Civil and Environmental Engineering

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Indiscriminate waste disposal poses a severe environmental challenge globally. Recycling of industrial wastes for concrete production is currently the utmost effective way of managing wastes for a cleaner environment and sustainable products. This study investigates the strength characteristics of self-compacting concrete (SCC) containing induction furnace slag (IFS) as a supplementary cementitious material (SCM). The materials utilized include 42.5R Portland cement, induction furnace slag as an SCM ranging from 0 to 50 % by cement weight at 10 % interval, river sand, granite, water and superplasticizer. The fresh properties were tested for filling ability, passing ability and segregation resistance, the strength characteristics measured include compressive strength, splitting tensile strength, flexural strength and Schmidt/rebound number. The oxide compositions and microstructural analysis of SCC were investigated using x-ray fluorescence analyser (XRF) and scanning electron microscopy equipped with energy-dispersive x-ray spectroscopy (SEM-EDS), respectively. Empirical correlations were statistically analyzed using MS-Excel tool. The filling ability characteristic was determined via both the slump flow test and the T50cm slump flow time test. Moreover, the passing ability characteristic was determined using L-Box test. The segregation resistance characteristic was determined using V-funnel at T5minutes test. The results of the fresh properties showed a reduction in the slump flow with increasing IFS content. On the other hand, the T50cm slump flow increased with increasing IFS content. Furthermore, the L-Box decreased with higher IFS content. On the contrary, the V-funnel at T5minutes increased considerably with greater IFS content. The strength test results revealed that the strength properties increased to 20 % IFS, with a value of 66.79 N/mm2 compressive strength at 56 days, giving a rise of 12.61 % over the control. The SCC microstructural examinations revealed the amorphous and better interface structures with increasing IFS content in the mix. The empirical correlations revealed that linear relationships exist among the measured responses (fresh and strength properties). Ultimately, IFS could be utilized as a sustainable material in producing self-compacting concrete.

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Evaluation of reactivity indexes and durability properties of slag-based geopolymer concrete incorporating corn cob ash

Cited by 39 publications

References 56 publications

Flexural optimization of slag-based geopolymer concrete beams modified with corn cob ash

Flexural optimization of slag-based geopolymer concrete beams modified with corn cob ash

Circular economy and durability in geopolymers ceramics pieces obtained from glass polishing waste

Effects of Induction-Furnace Slag on Strength Properties of Self-Compacting Concrete

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