Development of the fire resistance and mechanical characteristics of silica fume-blended cement pastes using some chemical admixtures

Habib, A.O.; Aiad, Ismail; El-Hosiny, F. I.; Mohsen, Alaa

doi:10.1016/j.conbuildmat.2018.06.051

Cited by 51 publications

(6 citation statements)

References 34 publications

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“…Usually, as the hydration reaction progresses, the unhydrated calcium silicate content gradually decreases [ 94 ]. As reported previously [ 95 , 96 , 97 ], the peaks of C 3 S and C 2 S overlap with those of the other minerals (C–S–H, calcium hydroxide (CH), and calcite). In Figure 17 , the peaks of C 3 S and C 2 S also appear to overlap; thus, it was not easy to determine the changes in reduction.…”

Section: Resultssupporting

confidence: 82%

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Liu

Her

et al. 2021

Nanomaterials

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In this study, a graphene oxide nanoribbons–functionalized carbon nanotubes–graphene oxide (GNFG) complex was hydrothermally synthesized as a nanomaterial for reinforcing cementitious composites, using a modified Hummers’ method. Three types of components existed in the GNFG: Type I, the functionalized carbon nanotubes–graphene oxide nanoribbons (FCNTs–GNR); and types II and III are graphene oxide (GO) and functionalized carbon nanotubes (FCNTs), respectively, which exist independently. The dispersivity of GNFG and its effects on the mechanical properties, hydration process, and microstructures of cement pastes were evaluated, and the results were compared with those using cement pastes incorporating other typical carbon nanomaterials. The results demonstrated that dispersion of GNFG in aqueous solutions was superior to that of the CNTs, FCNTs, and GO/FCNTs mixture. Furthermore, the highly-dispersed GNFG (0.05 wt.%) improved the mechanical properties of the cement paste after 28 days of hydration and promoted the hydration of cement compared to CNTs, GO, and GO/FCNTs mixture (0.05 wt.%). The results in this study validated the feasibility of using GNFG with enhanced dispersion as a new nano-reinforcing agent for various cementitious systems.

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Section: Resultssupporting

confidence: 82%

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Liu

Her

et al. 2021

Nanomaterials

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“…8, TP mix showed a broad hump ranging between 24.78-33.61° 2θ that centered at 28.93° 2θ related to calcite (CaCO 3 , PDF 01-071-3699) 95 , ill-crystalline from tobermorite-phase (C-S-H, PDF# 00-033-0306) in addition to Al-tobermorite-phase (C-A-S-H, PDF# 00-020-0452) as hydration products 42,95,108,109 . The same peaks were observed in the DM mix with the presence of intense high peaks at 26.3° 2θ referring to quartz (SiO 2 , PDF# 01-087-2096) 110 in addition to the wollastonite phase (CaSiO 3 , PDF# 00-043-1460) at 26.3 and 31.9° 2θ 95,[111][112][113] , which highlights the need for NaOH powder dissolution to be suitable for activation of the phases present in GGBFS. In the OP-30M mix case, a reduction in the intensity of the broad hump was observed, which indicates the low reactivity of alkali-activated powder treated for 30 min.…”

Section: Setting Timesupporting

confidence: 62%

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

Refaat

Mohsen

Nasr

et al. 2023

Sci Rep

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Sodium hydroxide (NaOH) as an alkaline activator presents a vital limitation in the mass production of alkali-activated binders due to its severe effect on users’ safety. In this study, safe and sustainable one-part alkali-activated slag mixes (OP-AAS) were prepared through an efficient microwave sintering for a mixture of active amorphous ground granulated blast furnace slag (GGBFS) and sodium hydroxide powder (NaOH). Different microwave-sintered powders were prepared using microwave energy of power 900 W for the mixture at different treatment periods (10, 20, and 30 min). Fresh and hardened properties of different OP-AAS mixes were studied. Moreover, the phase composition and microstructure were investigated using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM). Cytotoxicity/viability testing was performed to evaluate the cell death induced by the developed materials to measure their safety for the user. According to compressive strength, cytotoxicity/viability analysis, environmental impact and cost calculation of developed OP-AAS, it is concluded that employing microwave sintering for a short duration is sufficient to produce safe binding materials with adequate mechanical properties suitable for commercial applications in the construction sector.

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“…The indicative peaks of unreacted portion C 3 S, β-C 2 S, and quartz could also be distinguished. Besides, the peaks characteristic of the calcite phase (CaCO 3 ) is also identified, due to the reaction of the created lime (CH) with atmospheric CO 2 gas [30]. The inclusion of 2% CF NPs along these composites (Mixes ACFs3, BCFs3, and CCFs3) induced the formation of extra amounts of CAH, CASH, CSH (I), and CSH (II).…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 97%

Utilization of alum sludge waste for production of eco-friendly blended cement

Mohamed

El-Gamal

Farghali

2022

J Mater Cycles Waste Manag

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This work was focused on evaluating the suitability of replacing Portland cement (PC) by 5, 10 and 15 mass % of activated alum sludge waste (AAS) as a pozzolanic material. Exploitation of low-cost nanocomposite for bolstering the physical, mechanical, and stability against firing of PC–AAS-hardened composites was inspected. CuFe2O4 spinel nanoparticle with average particle size (~ 50 nm) was prepared. Inclusion of CuFe2O4 spinel in different PC–AAS-hardened composites bolsters their physicomechanical features at almost normal curing ages as well as their stability against firing. The positive impact of synthesized CuFe2O4 spinel was affirmed via TGA/DTG and XRD techniques, which indicated the presence of diverse hydration yields such as CSHs, CASHs, CFSH, and CuSH that enhance the overall physicomechanical characteristics and thermal stability of various PC–AAS-hardened composites. The composite containing (90 PC–10 AAS waste–2 CuFe2O4) offers many benefits from the economic and environmental view. Graphical abstract

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Development of the fire resistance and mechanical characteristics of silica fume-blended cement pastes using some chemical admixtures

Cited by 51 publications

References 34 publications

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

Utilization of alum sludge waste for production of eco-friendly blended cement

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