Mechanical Properties of Fly Ash and Ferrochrome Ash-Based Geopolymer Concrete Using Recycled Aggregate

Saha, Srinjoy; Mohanty, Tribikram; Saha, D.

doi:10.1007/978-981-15-4577-1_34

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…RCA's water absorption is 6.6%, which is two times the NA's water absorption (3.3%). Higher water absorption of RCA and its effect on the hardened and fresh properties of the concrete is also reported in previous studies (Le et al, 2021;Nuaklong et al, 2019;Saha et al, 2021).…”

Section: Geopolymer Concrete With Recycled Aggregatessupporting

confidence: 86%

Developing a sustainable self-compacting geopolymer concrete with 100% geopolymer-coated recycled concrete aggregate replacement

Nikmehr,

Kafle,

Al-Ameri

2023

SASBE

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PurposeConcrete, the second most used material in the world, surpassed only by water, relies on a vast amount of cement. The process of cement production emits substantial amounts of carbon dioxide (CO2). Consequently, it is crucial to search for cement alternatives. Geopolymer concrete (GC) uses industrial by-product material instead of traditional cement, which not only reduces CO2 emissions but also enhances concrete durability. On the other hand, the disposal of concrete waste in the landfills represents a significant environmental challenge, emphasising the urgent need for sustainable solutions. This study aimed to investigate waste concrete's best form and rate as the alternative aggregates in self-compacting and ambient-cured GC to preserve natural resources, reduce construction and demolition waste and decrease pertinent CO2 emissions. The binding material employed in this research encompasses fly ash, slag, micro fly ash and anhydrous sodium metasilicate as an alkali activator. It also introduces the best treatment method to improve the recycled concrete aggregate (RCA) quality.Design/methodology/approachA total of25%, 50% and 100% of coarse aggregates are replaced with RCAs to cast self-compacting geopolymer concrete (SCGC) and assess the impact of RCA on the fresh, hardened and water absorption properties of the ambient-cured GC. Geopolymer slurry was used for coating RCAs and the authors examined the effect of one-day and seven-day cured coated RCA. The mechanical properties (compressive strength, splitting tensile strength and modulus of elasticity), rheological properties (slump flow, T500 and J-ring) and total water absorption of RCA-based SCGC were studied. The microstructural and chemical compositions of the concrete mixes were studied by the methods of energy dispersive X-Ray and scanning electron microscopy.FindingsIt is evident from the test observations that 100% replacement of natural aggregate with coated RCA using geopolymer slurry containing fly ash, slag, micro fly ash and anhydrous sodium metasilicate cured for one day before mixing enhances the concrete's quality and complies with the flowability requirements. Assessment is based on the fresh and hardened properties of the SCGC with various RCA contents and coating periods. The fresh properties of the mix with a seven-day curing time for coated RCA did not meet the requirements for self-compacting concrete, while this mix demonstrated better compressive strength (31.61 MPa) and modulus of elasticity (15.39 GPa) compared to 29.36 MPa and 9.8 GPa, respectively, for the mix with one-day cured coated RCA. However, incorporating one-day-cured coated RCA in SCGC demonstrated better splitting tensile strength (2.32 MPa) and water absorption (15.16%).Research limitations/implicationsA potential limitation of this study on SCGC with coated RCAs is the focus on the short-term behaviour of this concrete. This limited time frame may not meet the long-term requirements for ensuring the sustained durability of the structures throughout their service life.Originality/valueThis paper highlights the treatment technique of coating RCA with geopolymer slurry for casting SCGC.

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Section: Geopolymer Concrete With Recycled Aggregatessupporting

confidence: 86%

Developing a sustainable self-compacting geopolymer concrete with 100% geopolymer-coated recycled concrete aggregate replacement

Nikmehr,

Kafle,

Al-Ameri

2023

SASBE

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“…When the researches are examined in terms of the pozzolanic material, usually, the mechanical strength developed with the increment of the pozzolanic material amount in the cementitious composites [7,8]. Particularly, the positive effect of pozzolanic materials with high SiO2 content, such as silica fume (SF), on the flexural strength and compressive strength was clearly seen [16][17][18]. SF is an amorphous (non-crystalline) and non-hazardous by-product material form silicon and Ferro-silicon alloy industry having ultra-fine particle size and large surface area which is suitable for concrete mix [16,19,20].…”

Section: C2s+4hmentioning

confidence: 99%

Investigation with SEM/EDX, XRD, TGA/DTA and FTIR analyses from a new point of view of the effects on cement mortars of different curing conditions and design parameters

Güneş¹,

YÜCEL²,

Öz³

2022

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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The aim of this study is the investigation of microstructural effects on cement mortars (CMs) of four different parameters as cement dosage, water/cement ratio, pozzolanic material and curing effect. To achieve the purpose of this study, SEM/EDX, XRD, FTIR and TGA/DTA analysis were performed. A total of 18 mixtures were produced and exposed to water curing (WC) and air curing (AC). In the design of these mixtures, three different cement dosages as 360, 400 and 450 kg/m 3 and three different water/cement ratios as 0.40, 0.45 and 0.50 were used. Silica fume (SF) was preferred to observe the effect on microstructural properties clearly of pozzolanic material. In addition, super plasticizer (SP) was utilized in all mixtures and kept constant as 12 kg/m 3 . The compressive strength, flexural strength and ultrasonic pulse velocity (UPV) of these mixtures were determined at 28 and 90 days. Eight mixtures were chosen to observe the effect of four different parameters in a microstructural sense. XRD, SEM/EDX, FTIR and TGA/DTA analyses were applied to these mixtures. It can be said that microstructural analyses supported the findings obtained from mechanical tests. Bu çalışmanın amacı, çimento dozajı, su/çimento oranı, puzolanik malzeme ve kür etkisi olmak üzere dört farklı parametrenin çimento harçları (ÇH) üzerindeki mikroyapısal etkilerinin araştırılmasıdır. Bu amaca ulaşmak için SEM/EDX, XRD, FTIR ve TGA/DTA analizleri yapılmıştır. Toplam 18 karışım üretilmiş ve bu karışımlar su kürü (SK) ve hava kürüne (HK) maruz bırakılmıştır. Bu karışımların tasarımında 360, 400 ve 450 kg/m 3 olmak üzere üç farklı çimento dozajı ve 0,40, 0,45 ve 0,50 olmak üzere üç farklı su/çimento oranı kullanılmıştır. Puzolanik malzemenin mikroyapısal özellikler üzerindeki etkisini net olarak gözlemlemek için silis dumanı (SF) tercih edilmiştir. Ayrıca, tüm karışımlarda süper akışkanlaştırıcı (SA) kullanılmış ve 12 kg/m 3 olarak sabit tutulmuştur. Bu karışımların basınç dayanımı, eğilme dayanımı ve ultrasonik titreşim hızı (UTH) değerleri 28 ve 90 günde belirlenmiştir. Mikroyapısal anlamda dört farklı parametrenin etkisini gözlemlemek için sekiz karışım seçilmiştir. Bu karışımlara XRD, SEM/EDX, FTIR ve TGA/DTA analizleri uygulanmıştır. Mikroyapısal analizlerin, mekanik testlerden elde edilen bulguları desteklediği söylenebilir.

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“…FCA is one of the contemporary source materials used in the preparation of geopolymer binders, along with FA. Saha et al [105] examined the feasibility of FCA-and FA-based geopolymer concrete, using 13 M NaOH and Na 2 SiO 3 solution as alkali activators. The natural coarse aggregates were replaced by recycled coarse aggregates (RCA), up to 50%, and the compressive strength of the samples was evaluated.…”

Section: Fca -Fa-based Geopolymer Bindermentioning

confidence: 99%

Sustainable Fly Ash Based Geopolymer Binders: A Review on Compressive Strength and Microstructure Properties

et al. 2022

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As a result of global warming, the pursuance of low-carbon, sustainable building materials has been prioritized. The development of geopolymer/cement-less binders can be considered an innovative and green way forward to minimize carbon footprint and tackle industrial waste material utilization. However, the chemical composition and properties of industrial waste-derived geopolymer binders varies considerably based on the chemical compositions of the source materials. This review paper presents a comprehensive understanding of the role of different chemical compositions (namely SiO2, Al2O3, CaO, Fe2O, and MgO) available in contemporary industrial wastes and the development of geopolymer binders. Subsequently, the compressive and microstructure properties of various FA-based geopolymer binders have been discussed to exhibit the feasibility of FA as a reliable source material. Significant findings and research gaps have been considered to aid future research works. Indeed, they provide guidelines for the commercial implementation of FA-based geopolymer binders as a low-carbon alternative to Portland cement.

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Mechanical Properties of Fly Ash and Ferrochrome Ash-Based Geopolymer Concrete Using Recycled Aggregate

Cited by 11 publications

References 9 publications

Developing a sustainable self-compacting geopolymer concrete with 100% geopolymer-coated recycled concrete aggregate replacement

Developing a sustainable self-compacting geopolymer concrete with 100% geopolymer-coated recycled concrete aggregate replacement

Investigation with SEM/EDX, XRD, TGA/DTA and FTIR analyses from a new point of view of the effects on cement mortars of different curing conditions and design parameters

Sustainable Fly Ash Based Geopolymer Binders: A Review on Compressive Strength and Microstructure Properties

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