Properties of High-Performance Concretes made of Black Sand at High Temperature

Eltawil, Khaled A.; Tahwia, Ahmed M.; Mahdy, Mohamed G.; Abdelraheem, Ahmed H.

doi:10.28991/cej-2021-03091634

Cited by 5 publications

(6 citation statements)

References 27 publications

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“…Greyish-yellow type BS from the Baltium shore, Egypt, with a specific gravity of 2.65 was used in all mix sets, except the control set. Figure 2 A shows the BS used in this study [ 41 ], and the BS had particle sizes between 0.15 and 0.3 mm, with a 2.2 fineness modulus and 92 cm 2 /gm surface area. Figure 2 and Figure 3 show the analysis of X-ray Diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) for BS used, as illustrated in Figure 3 and Figure 4 [ 41 ].…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…Figure 2 A shows the BS used in this study [ 41 ], and the BS had particle sizes between 0.15 and 0.3 mm, with a 2.2 fineness modulus and 92 cm 2 /gm surface area. Figure 2 and Figure 3 show the analysis of X-ray Diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) for BS used, as illustrated in Figure 3 and Figure 4 [ 41 ]. The NS used had a fineness modulus of 2.9 and a specific gravity of 2.55, as shown in Figure 2 B.…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…The NS used had a fineness modulus of 2.9 and a specific gravity of 2.55, as shown in Figure 2 B. Its grading sieve analysis is shown in Figure 5 [ 41 ]. Dolomite with a maximum nominal size of 12.5 mm was utilized as coarse aggregate, as shown in Figure 6 .…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…The aggregate was cleaned in the sieve to eliminate any harmful materials and chloride contamination. Table 1 displays the chemical composition of the binder materials and BS [ 41 ].…”

Section: Methodology Of Researchmentioning

confidence: 99%

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Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material

et al. 2021

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Experimental work was carried out to study new fine aggregate shielding construction materials, namely black sand (BS). The BS effect on the mechanical, durability, and shielding characteristics of heavyweight high-performance concrete (HWHPC) was evaluated. This study aimed at improving various HWHPC properties, concertedly. Fifteen mixtures of HWHPC were made, with various variables, including replacing 10% and 15% of the cement with fly ash (FA) and replacing normal sand by BS at various contents (15%, 30%, 45%, 60%, 75%, and 100%). The test specimens were subjected to various exposure conditions, including elevated temperatures, which ranged from 250 °C to 750 °C, for a duration of 3 h; magnesium sulfate (MS) exposure; and gamma-ray exposure. The effects of elevated temperature and sulfate resistance on concrete mass loss were examined. The results revealed that BS is a promising shielding construction material. The BS content is the most important factor influencing concrete compressive strength. Mixes containing 15% BS demonstrated significantly better strength compared to the control mixes. Exposure to 250 °C led to a notable increase in compressive strength. BS showed a significant effect on HWHPC fire resistance properties, especially at 750 °C and a significant linear attenuation coefficient. Using 10% FA with 15% BS was the most effective mixing proportion for improving all HWHPC properties concertedly, especially at greater ages.

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Section: Methodology Of Researchmentioning

confidence: 99%

Section: Methodology Of Researchmentioning

confidence: 99%

Section: Methodology Of Researchmentioning

confidence: 99%

“…The aggregate was cleaned in the sieve to eliminate any harmful materials and chloride contamination. Table 1 displays the chemical composition of the binder materials and BS [ 41 ].…”

Section: Methodology Of Researchmentioning

confidence: 99%

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Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material

et al. 2021

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“…Cement paste microstructure and morphology can be tracked via SEM analysis of changes in the C-S-H phase of hydration [18][19][20]. Also, SEM analysis can be used to characterize the pore structures in porous materials by calculating the total porosity and pore size distributions.…”

Section: Sem Analysismentioning

confidence: 99%

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

2022

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The use of calcined kaolin (CK) as a cementitious material in construction has attracted the interest of various researchers due to its environmental, mechanical, and physical qualities, all of which contribute to the lowering of cement usage. Studies have reported numerous problems associated with its use in concrete, apart from the ecological benefit that CK can provide. For instance, there is an issue of increased water demand due to smaller particle size, which generates much more heat in concrete, which has a detrimental effect on the mechanical and physical properties of concrete. This paper presents the analysis of an investigation aimed at using gum Arabic (GA) as a biopolymer admixture and calcined kaolin as a partial replacement of cement to improve the mechanical properties and durability of concrete. GA proportions ranged from 0 to 1% by weight of cement. Calcined kaolin (CK) was used to replace 5, 10, 15, 20, 25, and 30% of the cement content, respectively. Compressive strength, splitting tensile strength, density, strength loss, and weight loss tests were all performed to validate the structural performance of the modified concrete. The compressive tests, performed after 28 days from the time the mixture was made, demonstrated that the maximum percentage of CK that could replace cement without affecting the mechanical properties of concrete was 20%. Beyond 20%, concrete does not exhibit good compressive strength properties. The results also revealed decreased compressive strength and splitting tensile strength tests as the percentage of CK increased. After 56 days, compressive strength at 5% CK and 10% CK increased slightly by 0.743% and 1.162 %, respectively, compared to the control sample. The inclusion of 0.8%GA increased the compressive strength by 8.94% compared to the control sample (0%CK + 0%GA + 100%OPC) after 56 days. The results of durability tests showed that 0.6% GA had a higher compressive strength than other percentages containing GA. Doi: 10.28991/CEJ-2022-08-05-010 Full Text: PDF

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Appurtenance effects of GGBS, metakaolin, and colloidal nano-silica on the standard grade concrete

Kudale

Gidde

2023

Innov. Infrastruct. Solut.

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Properties of High-Performance Concretes made of Black Sand at High Temperature

Cited by 5 publications

References 27 publications

Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material

Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

Appurtenance effects of GGBS, metakaolin, and colloidal nano-silica on the standard grade concrete

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