Effect of high gamma radiation dosage and elevated temperature on the mechanical performance of sustainable alkali-activated composite as a cleaner product

Ramadan, M.; Amin, M.S.; Waly, S. A.; Mohsen, Alaa

doi:10.1016/j.cemconcomp.2021.104087

Cited by 56 publications

(6 citation statements)

References 85 publications

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“…The latter created larger spaces between chains and resulted in a porous structure, 24 the replaceable hydroxyl group involved in the chains gave its high reactivity. Compared with the patterns of raw materials including SA, CMC, and silica fume in Figure 6, the right-shift emerging ridgy "hump" ranging from the 2θ = 15 to 2θ = 35 is observed in Figure 7, which is attributed to the crosslinking and condensations of hydroxyls including Si OH and R OH involved in the CMC, corresponding to the amorphous siliceous chains, as shown in Equation (8) and Equation (9). The poly-condensations among the SA and CMC occur and the newly formed glassy Si C composite residues are detected, which is crucial to block the flame development and isolate the heat.…”

Section: Xrd Analysis Of Hybrid Coatings' Residuesmentioning

confidence: 93%

“…7 Therefore, an exploration of replacing the organic binder with inorganic silicon is intriguing attention, due to the cementitious reactivity and inherent noninflammability of geopolymer colloidal sols. The alkali-activated silicates undergo the process of "dissolution-condensation-polymerization" and transform into an inorganic siliceous film, 8,9 which could serve as the coating binder with ecological features. The asformed geopolymer holds cementitious reactivity and is prone to gelatinization, transforming into a siliceous fireshielding layer on the plywood through facile chemical modifications in theory.…”

Section: Introductionmentioning

confidence: 99%

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A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

Wang

Kou

Zhao

et al. 2022

J of Applied Polymer Sci

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To seek an effective strategy for improving the compatibility of carboxyl methyl cellulose (CMC) with silica fume-based geopolymer composite flameretarding coatings, a novel silica aerogel (SA) doped inorganic siliceous hybrid coating is fabricated by sol-gel. Results show that an appropriate dosage (0.5 wt%) of SA ameliorates their compatibility thus imparting an enhanced flame resistance, evidenced by the lowest value of fire growth index (0.22 kWÁm À2 Ás À1 ) decreased by 55% and the average effective heat of combustion (4.16 kWÁkg À1 ) decreased by 31%, the raised flame retardancy index of 5.54 from 1 compared with the control. Because the SA improves the compatibility between the CMC and siliceous colloidal sol, due to its high reactivity, electrostatic repulsion involved in SiO(OH) 3 À , and high porosity, leading to an enhanced crosslinking during film-forming of the hybrid coatings. Meanwhile, the reduction between CMC and silica occurs with a swelling fire shield, evidenced by the generated silicon involved in the as-formed amorphous siliceous residues. Therefore, it proposed a new strategy for optimizing the compatibility of organic-inorganic hybrid fireproof coatings, revealing an efficient design of CMC/inorganic siliceous flame retardants, high-value recycling technology of solid waste, low-carbon, and sustainable materials.

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Section: Xrd Analysis Of Hybrid Coatings' Residuesmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

Wang

Kou

Zhao

et al. 2022

J of Applied Polymer Sci

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“…The noticeable weight loss region in the figure, occurring at 110-200 °C, corresponds to the removal of chemically bound water from the gypsum crystals. A peak of heat absorption is observed between approximately 130-145 °C, while another peak occurs between 400 and 500 °C, which can be attributed to the continuous removal of chemically bound water [33,45,46] and the decomposition of CH [47][48][49]. The total weight loss of the samples decreases with increased PCE doping, indicating that excess PCE partially hinders the conversion of free water to bound water, thus inhibiting the hydration of fluorogypsum in FSLM.…”

Section: Tg-dscmentioning

confidence: 96%

Section: Tg-dscmentioning

confidence: 98%

Effect of Polycarboxylate Admixture on the Performance of Fluorogypsum-Based Self-Leveling Material

Fan,

Xiong,

Wang

et al. 2023

Applied Sciences

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The study explores the influence of polycarboxylate admixture (PCE) on fluorogypsum-based self-leveling material (FSLM) performance. Wev conducted an array of tests to assess workability and mechanical properties, and utilized XRD, TG-DSC, SEM, and MIP techniques for microscopic analysis. The fresh state results showed that PCE enables FSLM to achieve good workability at lower water demand. It was found that PCE partially inhibited plaster hydration from anhydrite to dihydrate, as observed by X-ray diffraction analysis and thermogravimetric analysis, and with the increasing in PCE, the mass loss of samples reached 15.66% at 28 days. The mechanical properties and the microstructure studies proved that the optimal PCE doping level is 0.14%. At this doping level, there is an enhancement in the denseness of the hardened structure, a reduction in porosity—especially when the pores are more than 200 nm, optimization of pore size distribution, an increase in crystal aspect ratio, an enhancement in effective intergranular overlap, and a significant improvement in the 28-day flexural and compressive strength to 7.2 MPa and 36 MPa, respectively. The FSLM prepared under these conditions demonstrates good performance and meets the primary performance index requirements of the Chinese Industry Standard JC/T 1023-2021 (gypsum-based self-leveling floor compound), thereby promoting the comprehensive utilization of fluorogypsum.

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“…These ratios confirm that composites D50 and D45-T5 have the lowest percentages of C-A-Hs. This is logical as these composites do not originally contain aluminum oxide [17,100].…”

Section: Morphologymentioning

confidence: 99%

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Ramadan

Kohail²,

Abadel³

et al. 2022

Case Studies in Construction Materials

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Effect of high gamma radiation dosage and elevated temperature on the mechanical performance of sustainable alkali-activated composite as a cleaner product

Cited by 56 publications

References 85 publications

A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

Effect of Polycarboxylate Admixture on the Performance of Fluorogypsum-Based Self-Leveling Material

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

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