Mechanical strength and durability analysis of mortars prepared with fly ash and nano-metakaolin

Garg, Rishav; Garg, Rajni; Eddy, Nnabuk Okon; Khan, Mohammad Amir; Khan, Afzal Husain; Alomayri, Thamer; Berwal, Parveen

doi:10.1016/j.cscm.2022.e01796

Cited by 24 publications

(11 citation statements)

References 42 publications

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“…The OPC-1%NS-10%MK formulation is a subject of interest in the field of research. The results of this study reveal that the ternary blends displayed a notable improvement in their ability to withstand the sulfate attack [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

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Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete

Bansal,

Bahrami

et al. 2024

PLoS ONE

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The intent of this study is to explore the physical properties and long-term performance of concrete made with metakaolin (MK) as a binder, using microsilica (MS) and nanosilica (NS) as substitutes for a portion of the ordinary Portland cement (OPC) content. The dosage of MS was varied from 5% to 15% for OPC-MK-MS blends, and the dosage of NS was varied from 0.5% to 1.5% for OPC-MK-NS blends. Incorporation of these pozzolans accelerated the hardening process and reduced the flowability, consistency, and setting time of the cement paste. In addition, it produced a denser matrix, improving the strength of the concrete matrix, as confirmed by scanning electron microscopy and X-ray diffraction analysis. The use of MS enhanced the strength by 10.37%, and the utilization of NS increased the strength by 11.48% at 28 days. It also reduced the penetrability of the matrix with a maximum reduction in the water absorption (35.82%) and improved the resistance to the sulfate attack for specimens containing 1% NS in the presence of 10% MK. Based on these results, NS in the presence of MK can be used to obtain cementitious structures with the enhanced strength and durability.

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Section: Resultsmentioning

confidence: 99%

“…SCMs not only enhance the durability of concrete but also provide a sustainable solution to reduce CO 2 emissions during concrete production [ 41 ]. In addition to its environmental benefits, the use of SCMs offers economic advantages by reducing the overall cost of concrete production [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete

Bansal,

Bahrami

et al. 2024

PLoS ONE

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“…SF is a byproduct obtained during the production of silicon metal and is very much used as an admixture due to its pozzolanic property, which ultimately improves the GPC performance [ 33 ]. The polymerisation process is increased by the Si–Al phase, and Si content rises after incorporating nano-materials such as NS, SF, nano-clay, nano-alumina, and nano-metakaolin in GPC [ 34 , 35 , 36 ]. Using air agents during the mixing process makes the GPC light in weight [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Chemicals Exposure on the Durability of Geopolymer Concrete Incorporated with Silica Fumes and Nano-Sized Silica at Varying Curing Temperatures

Paruthi,

Rahman,

Husain

et al. 2023

Materials

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Durable concrete significantly reduces the spalling caused by chemical damage. The objective of current research is to substitute cement with supplementary such as fly ash (FA), ground granulated blast furnace slag (GGBS), and alccofine (AF). Additionally, the impact of nano-silica (NS) and silica fumes (SF) on the GPC durability when cured at various temperatures has been attempted. In order to perform this, GPC samples were produced by combining NS and SF at proportions of 0.5% NS + 5% SF, 1% NS + 10% SF, and 1.5% NS + 15% SF, and then cured at temperatures of 27 °C, 60 °C, 90 °C, and 120 °C, respectively. In this research, all concrete specimens were continuously immersed for twelve weeks under four different chemicals, i.e., HCl (2%), H2SO4 (2%), NaCl (6%), and Na2SO4 (6%). The influence of chemical attack on the qualities of concrete was examined by evaluating the water absorption, sorptivity, loss of mass, and loss of GPC strength. The durability aspect is also studied by visual appearance and mass loss under harmful chemical attack. The combination of GPC with integrated NS and SF affords great resistance against chemical attacks. The percentages of these two components are 1.5% and 15%. For GPC specimens, when cured at 90 °C, the resultant strength is found at its maximum.

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“…It should also be noted that concretes made with the participation of SCMs allow not only to reduce CO 2 emissions generated during the burning of the Portland clinker [44,45], but also significantly reduce the amount of energy necessary to carry out this technological process [46]. The broad group of SCMs includes both traditional mineral additives such as: fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBFS) , metakaolin (MK) [47][48][49][50][51][52][53], volcanic pumice powder [54], or eggshells [55] as well as nanoadditives, which have been used to a large extent for several years [56][57][58][59][60][61][62][63][64][65]. Moreover, municipal sewage sludge are also used [66,67].…”

Section: Introductionmentioning

confidence: 99%

Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Golewski

2023

Mater. Res. Express

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The studies were carried out to find a relation between important physical property and the main mechanical parameter of concretes containing fly ash (FA) in order to develop indications for the production of durable composites with the addition of this waste. The tests included low volume fly ash concrete (LVFAC). The cements used in the studies were following: ordinary Portland cement (OPC), (FA-00) and two blended Portland cements containing FA in the amount of: 20%, (FA-20) and 30% (FA-30). Measurements of water adsorption (wa) by immersion and compressive strength (fcm) of analysed composites have been performed. The methodology of the wa tests was to reflect the conditions prevailing in the case of concrete- and reinforced concrete structures operating below the water table. The microstructure of all three materials was also assessed. Test results indicated that LVFAC mixes developed 28-day fcm between 45.10 for FA-30 to 48.96 MPa for FA-20 with a value of 47.51 MPa for the reference concrete. Neverless wa of LVFAC mixes decreased with the increase in FA content. The average values of wa was 4.6% for FA-30 and 5.3% for FA-20, respectively, while for concrete without FA it was 5.0%. Thus, it was found that wa by immersion was inversely proportional to the fcm. Based on the microstructural studies it was found that this behavior is attributed to reduced pore diameters and densification of cement matrix microstructure in FA-30 concrete. On the other hand concrete of series FA-20 showed a loose and porous microstructure, and wa in this composite increased accordingly. It can be stated that, the LVFAC containing 30% FA may increase durability of reinforced concrete structures subjected to immersion conditions.

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Mechanical strength and durability analysis of mortars prepared with fly ash and nano-metakaolin

Cited by 24 publications

References 42 publications

Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete

Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete

Effects of Chemicals Exposure on the Durability of Geopolymer Concrete Incorporated with Silica Fumes and Nano-Sized Silica at Varying Curing Temperatures

Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

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