Beneficial utilization of recycled asphaltic concrete aggregate in high calcium fly ash geopolymer concrete

Wongkvanklom, Athika; Posi, Patcharapol; Kampala, Apichit; Kaewngao, Traitot; Chindaprasirt, Prinya

doi:10.1016/j.cscm.2021.e00615

Cited by 22 publications

(15 citation statements)

References 34 publications

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“…Geopolymer concrete 327 kg m −3 fly ash, 54. Wongkvanklom et al [77] evaluated the surface abrasion resistance of high calcium fly ash geopolymer concrete with varying percentages of recycled asphaltic concrete aggregate (RACA) and liquid alkaline/ash ratios. In the geopolymer concrete admixtures, RACA was applied to partially replace coarse limestone aggregate at 0, 20, and 40%, and the liquid alkaline/ash ratios were varied from 0.45 to 0.75.…”

Section: Concrete Type Concrete Admixturementioning

confidence: 99%

“… The surface conditions of high calcium fly ash geopolymer concrete at 0.75 liquid alkaline/ash ratio after surface abrasion test with ( a ) 0% recycled asphaltic concrete aggregate, ( b ) 20% recycled asphaltic concrete aggregate, and ( c ) 40% recycled asphaltic concrete aggregate. Reproduced with permission from [ 77 ], [Case Studies in Construction Materials]; published by [Elsevier], [2021]. …”

Section: Figurementioning

confidence: 99%

“…Weight losses by surface abrasion of high calcium fly ash geopolymer concrete from the published work of Wongkvanklom et al[77]. Reproduced with permission from[77], [Case Studies in Construction Materials]; published by [Elsevier], [2021].…”

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confidence: 99%

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Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

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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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Section: Concrete Type Concrete Admixturementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

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“…Potable water is ideal or appropriate since it is free from oil, organic materials and other substances that would lead to harmful effects in a concrete mix. Thus, water conforming to the requirements of IS: 456 (2000) (Wongkvanklom et al. , 2021) is utilised in the making of concrete.…”

Section: Materials and Experimental Detailsmentioning

confidence: 99%

Assessing the utilisation of industrial waste as aggregate and manufactured sand: microstructural and durability characteristics on high-performance concrete

Kamasani¹,

Siddamreddy²

2022

IJSI

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PurposeUtilising industrial waste, such as fly ash (FA) and bagasse ash (BA), reduces waste management and increases mechanical strength. Concrete is modified with FA and BA in the cool bonded method of concrete preparation.Design/methodology/approachThe study used to partially replace cement with BA powder at proportions 0, 5, 10, 15, 20 and 25% and coarse aggregates are replaced with FA aggregates made with FA and cement using a cold-bonded technique at proportions 0–25%. FA aggregates were made at 10:90, 15:85, 20:80 and 25:75 proportions of cement and FA. The FA aggregates at the best proportion 15:85 was selected as a coarse aggregate by conducting tests like specific gravity, crushing value, impact value and water absorption tests.FindingsThe addition of 30% content decreases porosity by 21% and increases strength significantly at 28 days. Microstructure evolution is carried out to identify material behaviour.Originality/valueMechanical and durable properties such as flexural strength, tensile strength, water absorption test, acid and alkaline tests are conducted on M50 grade concrete after 3–28 days of curing.

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“…Supplementary cementitious materials (e.g., fly ash, silica fume, blast-furnace slag, metakaolin, and biomass ash) are used to reduce Portland cement consumption by replacing it in concrete [2][3][4]. Recycled waste glass powder has also been used to partially replace cement in concrete partially replaced by fly ash [5][6][7]. However, Portland cement is still the primary binder used to produce mortar and concrete.…”

Section: Introductionmentioning

confidence: 99%

Influences of Silica Fume on Compressive Strength and Chemical Resistances of High Calcium Fly Ash-Based Alkali-Activated Mortar

et al. 2022

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Although elevated temperature curing can increase the compressive strength of alkali-activated mortar, its field applications are still limited. In this study, alkali-activated mortars were prepared using high calcium fly ash (FA) as a precursor. Small amounts of silica fume were used to partially replace high calcium fly ash at 3–9% by weight to increase the strength of alkali-activated mortar. All mixtures had a liquid to binder ratio of 0.60 and sand to binder ratio of 2.75 by weight. A ratio of NaOH to Na2SiO3 solution was kept at 2:1 by weight. Mortar flow was also held between 105–115 using a superplasticizer. Compressive strength and durability were investigated in terms of acid and sulfate resistance. The effects of silica fume addition and curing temperature on compressive strength were found to be significant. The optimum content of silica fume was 6%, providing compressive strength as high as that of alkali-activated mortars cured at 45 °C. The weight loss of alkali-activated mortar due to sulfuric acid attack decreased with increasing silica fume content and curing temperature. All alkali-activated mortars were found to have a better performance than (ordinary) Portland cement (OPC) mortars and mortars containing 40% FA. Alkali-activated mortars immersed in magnesium sulfate solutions had compressive strength that decreased with an increase in curing temperature. The expansion of alkali-activated mortar due to sodium sulfate attack increased with increasing silica fume content, and the expansion decreased with increased curing temperature. All alkali-activated mortars performed better than OPC mortars after 98 days of sulfate attack.

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Beneficial utilization of recycled asphaltic concrete aggregate in high calcium fly ash geopolymer concrete

Cited by 22 publications

References 34 publications

Durability Performance of Geopolymer Concrete: A Review

Durability Performance of Geopolymer Concrete: A Review

Assessing the utilisation of industrial waste as aggregate and manufactured sand: microstructural and durability characteristics on high-performance concrete

Influences of Silica Fume on Compressive Strength and Chemical Resistances of High Calcium Fly Ash-Based Alkali-Activated Mortar

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