Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

Jeon, In Kyu; Woo, Byeong Hun; Yoo, Dong Ho; Ryou, Jae-Suk; Kim, Hong Gi

doi:10.3390/ma14061328

Cited by 10 publications

(7 citation statements)

References 58 publications

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“…However, the degree of purity rapidly changed afterward for MI, MII, and MIII in the first group. These results are considered excellent compared with other studies that have investigated the addition of nano SiO2 and nano MgO to underwater concrete, in which the pH values ranged between 11.1 and 11.9 [2].…”

Section: Ph Factor and Turbidity Tests Of Ndrpcsupporting

confidence: 68%

“…Otherwise, previous studies [2,[28][29][30] have used this test to predict the washout resistance of underwater concrete. Samples of NDRPC incorporating 15% SF showed that 58 to 258 NTU at 1 minute became 85 to 569 NTU at 15 minutes.…”

Section: Ph Factor and Turbidity Tests Of Ndrpcmentioning

confidence: 99%

“…Marine and hydraulic structures, particularly those damaged by abrasion-erosion, along with aging bridges, are a significant concern for construction experts. These structures often require underwater strengthening procedures to ensure their functional and structural safety [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Al-Saffar,

Al-Shathr,

Abed

2023

MMEP

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A novel testing methodology was developed in this study to efficiently evaluate the non-dispersibility of Reactive Powder Concrete (RPC) that does not disperse (Non-Dispersive RPC or NDRPC) -a concrete variant derived from the amalgamation of RPC and non-dispersive concrete. To study the fresh behavior of NDRPC, a series of fourteen mixes were prepared, each incorporating an Anti-Wash Admixture (AWA) concentration ranging between 0.5% and 2%. Fresh state properties were identified through a series of Slump Flow, V Funnel, L-box, and Setting Time tests, while washout resistance was determined through modified Stream Test, Turbidity, and pH tests. The findings constitute the first efficient evaluation of the non-dispersibility of fresh Self-Compacted Mortar (SCM) or concrete mixtures when placed underwater, as ascertained by V Funnel and L-box tests under similar conditions. Experimental results indicated a synergistic effect between AWA and High Range Water Reducer Admixture (HRWRA) concentrations on the properties, which could be counterbalanced by increasing the incorporation of silica fume to 30%. Notably, a significant reduction in washout loss was observed when silica fume replacement was increased to 30%.

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Section: Ph Factor and Turbidity Tests Of Ndrpcsupporting

confidence: 68%

Section: Ph Factor and Turbidity Tests Of Ndrpcmentioning

confidence: 99%

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Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Al-Saffar,

Al-Shathr,

Abed

2023

MMEP

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“…The results indicated that SiO 2 and MgO decreased slump, primary and secondary setting time, increased viscosity and improved resistance against scouring. Compressive strength increased with SiO 2 , while MgO showed a slight decrease in strength [11].…”

Section: State-of-the-art Reviewmentioning

confidence: 93%

Using Biopolymers as Anti-Washout Admixtures under Water Concreting

Atash Beik,

Moghadam,

Noori

et al. 2024

Buildings

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In this study, we investigate the use of natural additives (biopolymers) resistant to scouring. To this end, three natural substances, Kathira, sodium alginate, and guar gum, have been utilized as additives resistant to scouring, and we examine their mechanical performance, resistance to scouring, and the properties of fresh concrete including slump test, setting time, and ultimately shrinkage test. For this purpose, a total of 12 cylindrical specimens with dimensions of 15 by 30 cm were prepared for 28-day compressive strength test, and 12 cylindrical specimens with dimensions of 15 by 30 cm were prepared for 28-day indirect tensile strength test. Additionally, 12 concrete beams with dimensions of 10 by 10 by 35 cm were fabricated for a 28-day flexural strength test. All laboratory specimens were submerged in lime-saturated water for hydration for a period of 28 days for maintenance and preservation. The results indicate that all three biopolymers improve resistance to scouring, and, two substances enhance compressive, tensile, and flexural strength. Furthermore, all of them lead to a reduction in concrete shrinkage.

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“…Researchers Liu et al [20] found that adding mineral powder improved the pore size distribution and reduced the porosity of UWC, which improved the impermeability of concrete at a macrolevel. Jeon et al [21] investigated the effect of nano-SiO 2 (NS) and MgO on the hydration characteristics and antiwashout resistance of UWC. In this study, they demonstrated that NS and MgO reduced slump flow, increased viscosity, and enhanced the antiwashout resistance of UWC.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2 Methyl Modification on the Performance of Nondispersible Underwater Concrete and Reinforcement Mechanism

Zhong

Zheng

Yong-kang

et al. 2023

Advances in Civil Engineering

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The effect of SiO2 methyl modification (CH3-NS) on various properties of the nondispersible underwater concrete (UWC) was evaluated. The fluidity and antiwashout resistance of the UWC mixture were evaluated by various tests. Concrete specimens were designed in the two different damage states, i.e., P-type and Z-type. The compressive strength test, contact angle test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques were performed to analyze them. The experimental results showed that adding CH3-NS increased the fluidity of the UWC. When too much CH3-NS was added, the antiwashout resistance was reduced The CH3-NS doping should not exceed 3.0%. For P-type specimens, adding uncalcined CH3-NS improved the strength of the reinforced specimens compared to calcined CH3-NS, the value was 17.9%. And the peak and ultimate stresses of the specimens were shifted forward by 18.1 and 4.8%, respectively. The polar force component magnitude of the surface tension of the specimen was the major factor affecting the surface free energy of P-type specimens. Different CH3-NS statuses and the properties of specimens were the major factors affecting the surface free energy of Z-type specimens. Contact angle measurements, FTIR, and SEM showed that uncalcined CH3-NS enhanced the hydrophobicity and reduced the surface free energy while increasing the density of UWC and thus enhancing its compressive strength.

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Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

Cited by 10 publications

References 58 publications

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Using Biopolymers as Anti-Washout Admixtures under Water Concreting

Effect of SiO2 Methyl Modification on the Performance of Nondispersible Underwater Concrete and Reinforcement Mechanism

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