Pelletisation factors on the production of fly-ash aggregates and its performance in concrete

Shivaprasad, K. N.; Das, Biman; Sharath, B. P.

doi:10.1680/jcoma.19.00053

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…In this research, three types of curing were adopted to develop GPC. The first type of curing was oven curing, specimens GPC-NO and GPC-RO under this category were heated to a temperature of 60°C for 24 h (Rangan, 2008; Hardjito et al , 2004; Ahmed et al , 2020; Shivaprasad et al , 2019; Anuradha et al , 2012; Noushini et al , 2015). They developed a dense and compact alumino-silicate gel and a better interfacial transition zone between the binder and the filler as proved by the SEM examination of GPC specimens.…”

Section: Resultsmentioning

confidence: 99%

“…It is recommended to add the SS with SH after the liberation of heat. The alkaline solution was prepared 24 h (Shivaprasad, 2019) before casting of specimens to initiate the polymerization chain reaction (Vijaya Rangan, 2014). The alkaline liquid to FA ratio was considered as 0.61, and the alkali-hydroxide to silicate solution ratio was 1:2.5 to develop appropriate GPC mixtures (Anuradha et al , 2012; Noushini et al , 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Preparation of GPC mixtures is initiated from the preparation of AA solution (Rangan, 2008; Hardjito et al , 2004; Vijaya Rangan, 2014; Hardjito and Rangan, 2005; Ahmed et al , 2020; Shivaprasad et al , 2019; Anuradha et al , 2012; Noushini et al , 2015). The binder and filler are mixed with the alkaline solution in a saturated-surface-dry condition (SSD), then the AA is mixed with dry materials (FA/M-sand/CA) and allowed to mix until the homogeneous matrix is achieved.…”

Section: Methodsmentioning

confidence: 99%

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Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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Purpose This study aims to develop geopolymer concrete (GPC) using manufactured sand (M-sand) and recycled concrete aggregate (RCA) under different curing conditions. GPC is a sustainable construction material developed with industrial waste products such as fly ash to eliminate the use of cement in the production of concrete. GPC requires heat curing for the attainment of early age strength. The development of GPC under heat curing conditions is a hard process in practice. To overcome such circumstances, an attempt was made to develop the GPC under different curing conditions with the aid of coarse aggregate (CA) and RCA. The influence of different curing conditions on strength gain and microstructural characteristics of GPC is investigated. Mechanical properties of GPC such as compressive strength, tensile strength, flexural strength and elastic modulus are reported and discussed. Design/methodology/approach This study focuses on the assessment of mechanical and microstructure characterization of eco-efficient GPC developed with natural CA and RCAs. The required optimum quantity of binder, alkali activator, alkaline liquid to binder ratio and aggregates was determined by appropriate trials. Three types of curing methods, namely, ambient, oven and water, were used for the development of GPC mixes. Following the properties of RCA, it is realistic to substitute up to 40% of coarser aggregates as the resulting aggregate mix falls within the requirements of the analyzed mix. Findings Special attention is required for the mix with RCA because the mix’s consistency is affected by the high water absorption of the RCA mix. GPC specimens cured at ambient and water conditions exhibited marginal variation in the compressive strength for both CA and RCA. The compressive strength of GPC mixes prepared with RCA was marginally higher than that of the GPC made with CA under different curing regimes. RCA can be used as a sustainable material in lieu of CA in GPC. Originality/value The main significance of this research work is to develop the optimal mix design with appropriate mix proportion. The present study proposes a satisfactory methodology that enhances the mechanical strength of GPC as the guidelines are not available in the standards to address this problem. Effective use of waste materials such as fly ash and recycled aggregate for the development of GPC is another major research focus in the proposed investigation.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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“…Shivaprasad et al [34] reported the production of factory-made aggregates using a granulator of diameter 500 mm and depth 125 mm. The disk rotation speed was varied from 1 to 55 rpm, and the tilt angle was varied from 0 to 70°.…”

Section: Introductionmentioning

confidence: 99%

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Adhitya¹,

Saggaff²,

Saloma³

et al. 2023

cea

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Aggregates are an important ingredient of concrete. They are of two types: coarse aggregates and fine aggregates. The supply of natural aggregates on Earth is declining with technological advancement, hence, alternatives to natural aggregates are needed. Artificial aggregates have been manufactured using a coal burning waste, i.e. fly ash. On mixing fly ash with an alkaline activator, the mixture reacts and hardens. Aggregates are manufactured either by mixing materials using a granulator pan or by crushing materials using a stone crusher. The optimal manufacturing method was determined by comparing physical properties, such as bulk specific gravity, water absorption, and aggregate hardness, of the aggregates manufactured using these two methods with those of natural coarse aggregates. The average bulk specific gravity was 1.776 and 1.857 for the aggregates produced by the pelletization and crushing processes, respectively, and 2.957 for the natural aggregates. The average water absorption values were 11.62% and 8.37% for the aggregates produced by the pelletization and crushing processes, respectively, and 4.17% for the natural aggregates. The average aggregate hardness values, determined using the Los Angeles abrasion test, were 27.33% and 25.98% for aggregates produced by the pelletization and crushing processes, respectively, and 24.05% for the natural aggregates.

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“…But now, the usage of this technique is gaining importance recently to overcome the shortage of aggregates in meeting the demand of aggregates. Research on the manufacture of artificial aggregates utilizing the by-products from the industry like fly ash, bottom ash etc by agglomeration technique is studied [3]. Artificial aggregates can be produced by clustering fly ash into lumps in a pelletizer and then adopting hardening methods such as sintering, cold bonding, water curing, autoclaving and steam curing [4].…”

Section: Introductionmentioning

confidence: 99%

Geopolymer Aggregate Concrete: A review from fundamentals to developments

Siram

Sathyan

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Aggregates hold almost three-fourths volume of concrete. The tremendous increase in the growth rate of constructions has further accelerated the demand of aggregates. The utilization of aggregates to satisfy the demand has led to the inadequacy of aggregates. A unique method of developing non-conventional aggregates as a substitute of conventional coarse aggregates can be the justification of the issue. Meanwhile, considerable amount of fly ash produced from thermal power plants is disposed in landfills and ponds, creating hazard to the nature. Researchers have focused in utilizing fly ash to produce aggregates through the process of pelletization. Geopolymerization parameters such as Na2O content, slope and speed of disc pelletizer influence the properties of fly ash based pelletized aggregates. The compressive strength of geopolymer aggregate concrete depicted a higher value than concrete with conventional aggregates. The objective of this paper is to present the factors affecting the production of geopolymer aggregate concrete and the properties of these novel aggregate concrete.

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Pelletisation factors on the production of fly-ash aggregates and its performance in concrete

Cited by 9 publications

References 28 publications

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Geopolymer Aggregate Concrete: A review from fundamentals to developments

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