Use of micro and nano volcanic scoria in the concrete binder: Study of compressive strength, porosity and sulfate resistance

al-Swaidani, Aref M.

doi:10.1016/j.cscm.2019.e00294

Cited by 12 publications

(8 citation statements)

References 34 publications

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“…The filling effect of nano particles and the consequent reduction of morphology induced expansion were attributed to the enhancement of sulfate attack resistivity [ 31 ]. Swaidani et al observed that the crystals of ettringite were much smaller in concrete with 3% nano volcanic scoria than in plain concrete after exposure to 5% Na 2 SO 4 for 52 weeks [ 32 ]. Guo et al studied the effect of nano-silica on the sulfate attack resistance of the C 3 S hydration system, and found that NS prevented the expansive transformation of calcium hydroxide into gypsum, then retarded the sulfate attack process, and the 3% NS was the most effective [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Nie

et al. 2022

Materials

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Nano-silica (NS) is an effective material to improve the strength and durability of high-performance concrete (HPC), but little information is available regarding its role in HPC response to long-term sulfate attack. In this study, six different dosages of NS (0%, 1%, 2%, 3%, 4%, and 5%) as cement partial replacement were mixed into HPC and the casted specimens were soaked in sulfate solution for different periods (0, 100, 200, and 300 days). The mass change, dynamic elastic modulus, compressive and splitting strength, microstructure morphology, and porosity characteristics of HPC specimens were measured by mass tests, mechanical properties tests, scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) tests. The results showed that the incorporation of NS decreased the mass loss, elevated the compressive and splitting strength, and reduced the porosity formation of HPC in front of sulfate attack. The percentage of 1% NS was among the most effective dosages as, after soaking for 300 days, it decreased the mass loss by 13.5%, elevated the elastic modulus as well as compressive and splitting strength by 50.4%, 31.7%, and 69.8% in comparison of unmodified HPC, respectively. The sulfate attack resistance was delayed in a higher (2–5%) mixed dosage, mainly due to the agglomeration of nano particles, especially after long-term reactions. This study can provide experimental references regarding the performance of HPC mixed with NS in front of sulfate attack.

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Section: Introductionmentioning

confidence: 99%

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Nie

et al. 2022

Materials

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“…To reach the studied sizes; namely 100 nm & 500 nm, NP was ground for 360 min and 275 min, respectively, using a laboratory centrifugal ball mill (Retsch, S100, Germany). The adopted NP dispatch/steel ball ratio was 1/5 at a revolution number of 300 rpm [2] .…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental data on permeability-related properties of concrete containing nano natural pozzolana as cement replacement

al-Swaidani

2022

Data in Brief

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“…After that, we immersed them in water until saturated; the cement specimens were then removed from the water; the mass ( M 2 ) was immediately recorded; and the average value M C was calculated to investigate the effect of different dosages of the expansive delayed agent on the porosity and rate of expansion. The porosity of concrete was calculated using eq P = ( M c − M 0 ) ρ normalc M normalc ρ normalw where M c is the average value of the wet mass after water absorption in kilograms; M 0 is the average value of the dry mass in kilograms; ρ w is the density of water at room temperature in kilograms per cubic meter; and ρ c is the apparent density after water absorption in kilograms per cubic meter.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Performance of Microencapsulated Sealing Material for Coal Mine Gas Drainage

et al. 2022

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The performance of coal mine gas extraction borehole sealing material plays an essential role in the efficiency of gas extraction. Microcapsule technology was proposed to delay the expansion time of sealing materials to address the ineffective expansion of cement-based sealing materials in hydration. Based on conventional cement-based sealing materials, delayed-expansion microcapsules were prepared by phase separation with ethyl cellulose (EC) as the capsule wall material and montmorillonite (MMT) as the core material. A single-factor experiment showed that the delayed-expansion microcapsule had the best comprehensive effect when the EC content was 3%, the stirring rate was 400 rpm, the MMT content was 3.5%, and the core–wall ratio (CWR) was 10:3. Second, the slow release effect of the cement samples under the action of microcapsules is remarkable through physical tests. In addition, the triaxial compression test results show better mechanical properties of the delayed-expansion sealing materials. Then, nuclear magnetic resonance scanning was applied to the coal samples injected with different sealing materials. It was found that the proportions of macropores and mesopores in the total pore volume in the coal sample at 50 and 100 mm from the borehole wall decreased by 12.28 and 11.82%, respectively, indicating that the delayed-expansion sealing material has a better sealing effect.

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Use of micro and nano volcanic scoria in the concrete binder: Study of compressive strength, porosity and sulfate resistance

Cited by 12 publications

References 34 publications

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Experimental data on permeability-related properties of concrete containing nano natural pozzolana as cement replacement

Preparation and Performance of Microencapsulated Sealing Material for Coal Mine Gas Drainage

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