Effects of alccofine and curing conditions on properties of low calcium fly ash-based geopolymer concrete

Saloni,; Singh, Abhishek; Sandhu, Vaibhav; Jatin,; Parveen,

doi:10.1016/j.matpr.2020.02.763

Cited by 37 publications

(13 citation statements)

References 12 publications

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“…This can be caused by the high volume of fibers, which started to show accumulation of branch of multifilament fibers in a particular place, nonuniformity, and agglomeration of the matrix, as showed in Figure 5d, which is not observed at other percentages. Some research has found the same loss in properties after reaching the optimum content of natural fiber in the matrix [52][53][54].…”

Section: Effect Of Fiber Percentage On Water Porositymentioning

confidence: 80%

Assessment of the effect of fiber percentage in glass fiber reinforced slag-based geopolymer

Alves

Leklou

Souza

et al. 2021

Journal of Asian Ceramic Societies

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Fibers can increase the ductility of geopolymer materials, acting as reinforcements to improve mechanical properties. These improvements depend on fiber content and quantity. This study evaluates the impacts of different percentages of glass fiber on a GBFS (ground blast furnace slag) geopolymer matrix. The glass fibers were used on the critical length of 20 mm, obtained by pull-out test in previous studies. Percentages of 0.25%, 0.50%, 0.75%, and 1.00% of glass fiber in mass were tested in fresh state, by flow measurement, and in hardened state, by variation of shrinkage, water porosity and response of composites under flexural and compressive load conditions at 7, 14, 28, and 90 days. The mixture resulted in a high porosity geopolymer paste. In addition, an analysis of variance (ANOVA) was performed to evaluate the statistical significance of fibers in compressive strength. The results show that increasing percentages glass fibers, until 0.75%, enhances mechanical properties. Percentage of 1.00% started to show accumulation of branch of multifilament fibers which contribute to higher drying shrinkage. The ANOVA test showed that the percentage of fibers can influence the compressive strength. With the results, the optimum percentage of fibers for his composite mixture was found at 0.75%.

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Section: Effect Of Fiber Percentage On Water Porositymentioning

confidence: 80%

Assessment of the effect of fiber percentage in glass fiber reinforced slag-based geopolymer

Alves

Leklou

Souza

et al. 2021

Journal of Asian Ceramic Societies

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“…With low chloride ion penetrability, it could be affirmed that the geopolymer-blended recycled concrete offered good protection to steel reinforcement against corrosion. It is notable that there are a number of published research papers [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ] on the mechanical properties of geopolymer concrete without revealing the findings on its durability characteristics. Guided by these developments, it is the aim of this article to review and evaluate the durability aspects of geopolymer concrete.…”

Section: Introductionmentioning

confidence: 99%

Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

107

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Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

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“…The production of cement, which is the main binder of concrete, is not only energy-intensive but also environmentally hostile since it is responsible for 5 -7% of global carbon dioxide (CO 2 ) emissions (Andrew 2017). Geopolymer concrete (GPC) has been recently suggested (Parveen et al, 2018; as a sustainable alternative to conventional concrete, minimizing environmental pollution. GPC utilizes alumina-silicate materials such as y ash (FA), slag, or rice husk ash (RHA) as binders in place of cement.…”

Section: Introductionmentioning

confidence: 99%

“…The use of slag relaxes the elevated temperature curing requirement of GPC, thus extending its application to cast-in-situ construction. Previous studies have proven that the incorporation of UFS in GPC improved its mechanical and durability characteristics (Parveen et al, 2018;Saloni et al, 2020) due to its excellent binder properties. Some studies reported that the utilization of slag in GPC signi cantly improved its properties, and GPC is superior to conventional concrete (Dhirendra Singhal and Garg 2017; Jindal et al 2020; ).…”

Section: Introductionmentioning

confidence: 99%

Strength, durability, and microstructure of self-compacting geopolymer concrete produced with copper slag aggregates

Arora

Jangra

Lim

et al. 2022

Environ Sci Pollut Res

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Lack of vibrations on fresh concrete negatively in uences the compaction and thus the quality of concrete. This is particularly concerning with geopolymer concrete (GPC) containing sodium silicate (Na 2 SiO 3 ), which is viscous in nature. In this study, self-compacting geopolymer concrete (SCGC) containing y ash (FA) and ultra ne slag (UFS) with copper slag aggregates (CSA) was proposed and investigated. CSA were used as a substitute to sand (by weight) in SCGC at different percentages up to 60%. In the fresh state, slump, T500 slump ow, V-funnel, L-box, U-box, and sieve aggregation ratio tests were performed to investigate owability, passing ability, and viscosity. At the hardened state, the compressive strength, water absorption, chloride ion resistance and sorptivity tests were examined. The owability of SCGC improved when CSA were added, and the highest slump of 735 mm was achieved for the mix with 60% CSA. Substitution of up to 20% of CSA enhanced the properties of SCGC at all ages. Mix having 20% CSA (20CSA-SCGC) was superior to other mixes, exhibiting the highest compressive strength (47 MPa) at 365 days while possessing the lowest water absorption, sorptivity, and the highest chloride ion resistance. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses also con rmed the improved microstructure of Mix 20CSA-SCGC. Meanwhile, X-ray diffraction (XRD) analysis con rmed the presence of quartz and calcium silicate hydrate (CSH) products, which were the main contributors to properties enhancement. HighlightsUtilization of copper slag aggregates as partial substitution to sand. SCGC with improved mechanical and durability properties.Microstructure of SCGC studied using SEM, XRD and EDS analyses.Correlations between different properties were established.

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Effects of alccofine and curing conditions on properties of low calcium fly ash-based geopolymer concrete

Cited by 37 publications

References 12 publications

Assessment of the effect of fiber percentage in glass fiber reinforced slag-based geopolymer

Assessment of the effect of fiber percentage in glass fiber reinforced slag-based geopolymer

Durability Performance of Geopolymer Concrete: A Review

Strength, durability, and microstructure of self-compacting geopolymer concrete produced with copper slag aggregates

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