Crack healing and flexural behaviour of self-healing concrete influenced by different bacillus species

,; Durga, Chereddy Sonali Sri; Venkatesh, Chava; ,; Muralidhararao, T.; ,; Bellum, Ramamohana Reddy; ,

doi:10.17515/resm2023.744st0423

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…For testing flexural strength, five beam specimens of 500 mm x 100 mm x 100 mm dimensions were prepared and moist cured for 28 days as per IS 516 [50][51][52][53][54]. The test procedure followed IS 516 specifications using a 200 kN capacity flexural testing machine.…”

Section: Flexural Strengthmentioning

confidence: 99%

Synergistic effects of GGBFS addition and oven drying on the physical and mechanical properties of fly ash-based geopolymer aggregates

Sonali Sri Durga,

Chava,

Priyanka

et al. 2024

Journal of Sustainable Construction Materials and Technologies

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Conventional coarse aggregates, extracted from natural sources, pose environmental challenges such as habitat destruction, resource depletion, and high energy consumption. To mitigate these effects, this study prepared geopolymer aggregates (G.A.) using fly ash–GGBFS and an alkali ac- tivator solution through pelletization. Furthermore, two aggregate drying methods, oven drying, and ambient air drying, are adopted to evaluate their optimal performance through physical and mechanical tests. The results Indicated that oven-dried geopolymer aggregates exhibited optimal behavior in all experimental aspects compared to ambient air-dried aggregates. Specifically, the 80% fly ash–20% GGBFS mixed aggregates demonstrated lower crushing value (20.80%), impact value (24.7%), water absorption (13.67%), and abrasion values (7.01%) than other mixes. No considerable difference was observed in the density and specific gravity of aggregates between the two drying methods. Subsequently, these aggregates were used as a 100% replacement for conventional coarse aggregates in concrete, and the concrete's mechanical properties, such as compressive, split tensile, and flexural strengths, were investigated. Please update the following sentence in place of the highlighted sentence. The mix M3 (i.e., 80% fly ash–20% GGBFS mixed aggregates incorporated concrete) showed superior performance and are considered the opti- mum mix. Specifically, in the compressive strength results, the mix M3 showed a 26.31% and 14.28% strength increase compared to the 100% fly ash aggregates incorporated concrete mix in oven-dried aggregates and ambient-dried aggregates incorporated concrete, respectively. The lin- ear regression equation derived from the experimental results was used to predict the split tensile and flexural strength, showing a good correlation between the experimental and expected results.

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Section: Flexural Strengthmentioning

confidence: 99%

Synergistic effects of GGBFS addition and oven drying on the physical and mechanical properties of fly ash-based geopolymer aggregates

Sonali Sri Durga,

Chava,

Priyanka

et al. 2024

Journal of Sustainable Construction Materials and Technologies

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“…One promising approach is the utilization of supplementary cementitious materials (SCMs), which not only reduce the consumption of Portland cement (PC) but also offer a means to manage waste materials generated across various industries [23,24,25]. Given the continual increase in the generation of FA and GGBFS, these materials can serve as valuable mineral admixtures to enhance the durability and strength of concrete, leveraging their inherent pozzolanic properties [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Incorporating Fly ash and Ground granulated blast furnace slag in concrete not only reduces cement usage but also has a significantly lower impact on the environment and energy consumption, resulting in reduced CO2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Corrosion characteristics of rebar in Fly Ash-GGBFS synthesised alkali activated concrete

Muralidhara Rao,

Venkatesh,

Sri Durga

et al. 2024

J. Phys.: Conf. Ser.

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Using accelerated corrosion technique, it is proposed to study the influence of anodic corrosion inhibitors like calcium nitrites (0%, 2%, 4%, 6%) and sodium nitrites (0%, 2%, 4%, 6%) on the Fe550 grade steel reinforcement corrosion of M20 grade Geopolymer concrete (70%FA+30%GGBFS) cylindrical specimens prepared using 3M and 5M alkali activators. Geopolymer concrete cylinders with rebar inserted are placed in the 5% NaCl solution and the corrosion time and corrosion current required for the corrosion of steel reinforcement bars was calculated by supplying a constant voltage of 12volts. Three cylindrical specimens of 200mm diameter and 100mm height are cast in each percentage of corrosion inhibitors and the corrosion characteristics like Corrosion rate, mass loss, Corrosion density, Corrosion current, Corrosion time of steel reinforcement were calculated. 200mm length and 10mm diameter steel reinforcement bar was used in the Geopolymer concrete cylindrical specimens. 4% of Calcium nitrite (Ca(No2)2) and 4% of Sodium nitrite (NaNo2) with 3M and 5M alkali activators were found to be optimum with less mass loss and rate of corrosion. The mass loss and rate of corrosion of 3M alkali activator Geopolymer concrete mix were less compared to that of 5M alkali activator geopolymer concrete.

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Effect of Mineral Admixtures and Curing Regimes on Properties of Self-Compacting Concrete

Chava,

M.v.,

Munugala

et al. 2024

Journal of Sustainable Construction Materials and Technologies

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This study investigated the influence of mineral admixtures (fly ash, silica fume, metakaolin) and curing conditions (water immersion, polyethylene glycol, gunny bags, accelerated curing) on the properties of self-compacting concrete (SCC). The rheological properties, compressive strength, chloride penetration resistance, and microstructure were evaluated. Incorporating mineral admixtures improved the workability, strength (up to 53% increase), and durability of SCC compared to plain mixes, with 20% metakaolin replacement being optimal. Water immersion curing enhanced the compressive strength (3-15% increase) and chloride resistance (up to 30% decrease in migration coefficient) owing to improved hydration and microstructural refinement. Mineral admixtures reduced the sensitivity of SCC to curing method. Microstructural analysis showed higher density and additional C-S-H phases with mineral admixtures under wet curing. The study demonstrates that optimized SCC containing appropriate supplementary cementitious materials coupled with proper external curing can achieve high performance.

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Crack healing and flexural behaviour of self-healing concrete influenced by different bacillus species

Cited by 5 publications

References 29 publications

Synergistic effects of GGBFS addition and oven drying on the physical and mechanical properties of fly ash-based geopolymer aggregates

Synergistic effects of GGBFS addition and oven drying on the physical and mechanical properties of fly ash-based geopolymer aggregates

Corrosion characteristics of rebar in Fly Ash-GGBFS synthesised alkali activated concrete

Effect of Mineral Admixtures and Curing Regimes on Properties of Self-Compacting Concrete

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