Role of expanded clay aggregate, metakaolin and silica fume on the of modified lightweight concrete properties

Tawfik, Taher A.; AlSaffar, Doha M.; Tayeh, Bassam A.; Metwally, Khaled Aly; El-Kattan, Ibrahim M.

doi:10.1080/12269328.2021.1887002

Cited by 35 publications

(9 citation statements)

References 38 publications

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“…We use the SiC as a foaming agent of solid waste ceramsite, not just to deal with a large number of wastes, and it does not pollute the environment. In recent years, lightweight concrete has been used in the field of building materials and the construction industry to achieve energy saving and consumption reduction [ 30 ]. This lightweight ceramsite can be used as artificial aggregate to replace natural aggregate to produce lightweight concrete and realize resource utilization [ 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Shang

Fan

et al. 2022

Materials

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SiC was chosen as the foaming agent, and river bottom silt, waste oil sludge, paint bucket slag, and fly ash were used as raw materials, to prepare lightweight ceramsite without adding any chemical additives. The effects of SiC dosing and sintering temperature on various properties of the ceramsite were studied, and the pore-forming mechanism of the lightweight ceramsite was clarified by thermal analysis and X-ray diffraction analysis. The results showed that the single ceramsite compressive strength, water absorption, bulk density, and porosity of ceramsite sintered at 1180 °C with 1.0% SiC were 2.15 MPa, 2.02%, 490 kg/m3, and 23.85%, respectively. The major mineralogical compositions were quartz, fayalite, and kyanite, with small amounts of albite-low from 1140 to 1190 °C. Furthermore, the concentration of all tested heavy metals from ceramsite was lower than the maximum allowable concentration of the leaching solution specified in the Chinese national standard (GB 5085.3-2007), which reveals that this solid waste ceramsite will not cause secondary environmental pollution. The prepared ceramsite, exhibiting lower bulk density, high water absorption and porosity, and effective solidification of deleterious elements, can be used to prepare green lightweight aggregate concrete. Importantly, preparation of solid waste ceramsite is an effective way to dispose of hazardous wastes.

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Section: Resultsmentioning

confidence: 99%

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Shang

Fan

et al. 2022

Materials

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“…24,25 Among them, nanosilica (NS) is relatively outstanding. 26 According to previous studies, NS addition decreases the permeability and increases the compressive strength of concrete because it has a filler effect in which it fills the voids in the C-S-H gel and forms nanostructured C-S-H gel materials, thereby improving the microstructure. 27,28 Hani et al 29 studied the effect of increasing the water/binder ratio on the fresh and hardened properties of SCC containing NS and found that the NS dosage is critical for SCC.…”

Section: Introductionmentioning

confidence: 94%

“…The number of studies on using nanoparticles to enhance concrete properties is increasing 24,25 . Among them, nanosilica (NS) is relatively outstanding 26 . According to previous studies, NS addition decreases the permeability and increases the compressive strength of concrete because it has a filler effect in which it fills the voids in the C–S–H gel and forms nanostructured C–S–H gel materials, thereby improving the microstructure 27,28 .…”

Section: Introductionmentioning

confidence: 99%

Properties and durability of self‐compacting concrete incorporated with nanosilica, fly ash, and limestone powder

Hakeem

Amin

Zeyad

et al. 2023

Structural Concrete

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This research focused on finding the effect of nanosilica (NS) on the properties of self‐compacting concrete (SCC). NS in various proportions of 1%, 2%, 3%, 4%, 5%, 6%, 8%, and 10% was added to SCC with 10% silica fume (SF) or 10% fly ash (FA) by weight of cement to improve the properties of SCC. While the limestone powder (LSP) was used at a fixed supplementation of 15% by cement weight for all mixes. Fifteen SCC mixtures were designed based on the European guidelines for self‐compacting concrete. The properties of fresh SCC were evaluated by several tests of the slump flow, slump T50, V‐funnel, V‐funnel T5min, L‐box J‐ring, and fill box. Meanwhile, several tests evaluated SCC's mechanical properties, including compressive strength, split tensile strength, flexural strength, bond strength, and modulus of elasticity. Moreover, the permeability properties of SCC were evaluated by water permeability and air‐content tests. The effect of applying high temperatures (100–800°C) on the compressive strength of SCC containing NS with cementitious materials (SF, FA, and LSP) was also evaluated. Results showed that adding 3% NS with 10% SF and 15% LSP by weight of cement can be used to achieve the best mechanical properties of SCC. The SFNS3 mixture achieved the highest mechanical properties of 75.1, 11.9, and 41,300 MPa for compressive strength, bond strength, and modulus of elasticity tests. While the results for the slump flow, slump T50cm, and fill box were 680 mm, 6 s, and 93%.

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“…The chemical composition of SCMs determines whether they are self-cementing, pozzolanic, or both [ 43 , 44 ]. These materials can be acquired from industrial wastes, including fly ash (FA) [ 45 ], silica fume (SF) or microsilica (MS) [ 46 ], metakaolin (MK) [ 47 ], slag [ 48 ], nanosilica (NS), and even an agricultural waste, such as sugarcane bagasse ash [ 49 ]. Researchers have utilized various types of SCMs to improve the characteristics of cement-based structures [ 50 ].…”

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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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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Role of expanded clay aggregate, metakaolin and silica fume on the of modified lightweight concrete properties

Cited by 35 publications

References 38 publications

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Properties and durability of self‐compacting concrete incorporated with nanosilica, fly ash, and limestone powder

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

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