Effects of microbial agents to the properties of fly ash-based paste

Wulandari, Kiki Dwi; Ekaputri, Januarti Jaya; Triwulan, undefined; Fujiyama, Chikako; Setiamarga, Davin H. E.

doi:10.1051/matecconf/201819501012

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…The compressive strength result were related to spesific gravity reslut. Compressive strength and spesific gravities have linear relationship according to the development strength of mixture, and affect the closed porosities [21].…”

Section: Compressive Strength Of Foamed Mortarsmentioning

confidence: 99%

Compressive Strength Investigations Of Foamed Mortar Incorporating Sandblasting Waste As Supplementary Cementitious Materials

Wulandari,

Jannah,

Wutsqo

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Silica sand is one of the abrasive materials commonly used in the sandblasting process. The production of sandblasting waste is raising yearly, linear with the rapid development of the shipping industries. Silica sand was produced as by-product waste, approximately 400 ton per year. This research focused on compressive strength investigations of the foamed mortar incorporating silica sand as a supplementary cementitious material (SCM). Foamed mortar is a lightweight mortar made from a mixture of water, cement, sand, and foam, which can reduce the density of the mortar for construction purposes. Prior to use as SCM, the silica sand was pre-treated by using mechanical grinding to produce finer materials similar to cement. The observations were applied to pre-treated silica sand, such as chemical compositions, particle size analysis, normal consistency test, and setting time test. The specimens used in this research were mortar concrete with dimensions 5 x 5 x 5 cm and tested according to ASTM C579-01. The pre-treated silica sand varied from 10%, 20%, and 30% by weight of cement, were applied in this investigation. The compressive strength and spesific gravity were also observed. The results show that 20% cement replacement with pre-treated silica sand is the optimum composition and has 52.2 MPa in compressive strength at 28th days. These investigations conclude that pre-treated silica sand is potentially used as SCM in foamed mortars for sustainable concrete materials.

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Section: Compressive Strength Of Foamed Mortarsmentioning

confidence: 99%

Compressive Strength Investigations Of Foamed Mortar Incorporating Sandblasting Waste As Supplementary Cementitious Materials

Wulandari,

Jannah,

Wutsqo

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Katebi et al spread a cementation solution containing S. pasteurii cells on the sand surface, which resulted in a stable sand crust at the field scale in the desert [78]. A similar strategy was also applied for the solidification of fly ash into a green sustainable material, increasing the compressive strength up to 43.75% [79]. Looking forward, Larsson et al envisioned bold plans to solidify Sahara sand to build comfortable shelters for humans and prevent the spreading of the desert, illustrating the vast potential of biomineralization in environmental stewardship [80].…”

Section: Environmental Applicationsmentioning

confidence: 99%

Biomineralization Induced by Cells of Sporosarcina pasteurii: Mechanisms, Applications and Challenges

Wu¹,

Li²,

Li³

2021

Microorganisms

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Biomineralization has emerged as a novel and eco-friendly technology for artificial mineral formation utilizing the metabolism of organisms. Due to its highly efficient urea degradation ability, Sporosarcina pasteurii(S. pasteurii) is arguably the most widely investigated organism in ureolytic biomineralization studies, with wide potential application in construction and environmental protection. In emerging, large-scale commercial engineering applications, attention was also paid to practical challenges and issues. In this review, we summarize the features of S. pasteurii cells contributing to the biomineralization reaction, aiming to reveal the mechanism of artificial mineral formation catalyzed by bacterial cells. Progress in the application of this technology in construction and environmental protection is discussed separately. Furthermore, the urgent challenges and issues in large-scale application are also discussed, along with potential solutions. We aim to offer new ideas to researchers working on the mechanisms, applications and challenges of biomineralization.

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“…Geopolymer pores were filled with CaCO3, causing improvements in their mechanical properties [11] Fly Ash Genetically-modified B. subtilis None 70.9%, 40.0%, and 68.87% increase in compressive strength, ultrasonic pulse velocity, and acid resistance, respectively, after 28 days [12] Given the huge gap that needs to be filled in truly developing self-healing biogeopolymers, the present study seeks to explore what locally available species of bacteria can be used as healing agents for fly ash-based geopolymers and how their viability in such a material can be further improved.…”

Section: Geopolymer Precursor Healing Agent Immobilizer Key Findings mentioning

confidence: 99%

Self-Healing Biogeopolymers Using Biochar-Immobilized Spores of Pure- and Co-Cultures of Bacteria

Doctolero¹,

Beltran²,

Uba³

et al. 2020

Preprint

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A sustainable solution for crack maintenance in geopolymers is necessary if they are to be the future of modern green construction. This study thus aimed to develop self-healing biogeopolymers that could potentially rival bioconcrete. First, a suitable healing agent was selected from Bacillus subtilis, B. sphaericus, and B. megaterium by directly adding their spores in the geopolymers and subsequently exposing them to a large amount of nutrients for 14 days. SEM-EDX analysis revealed the formation of biominerals for B. subtilis and B. sphaericus. Next, the effect of biochar-immobilization and co-culturing (B. sphaericus and B. thuringiensis) on the healing efficiencies of the geopolymers were tested and optimized by measuring their ultrasonic pulse velocities weekly over a 28-day healing period. The results show that using co-cultured bacteria significantly improved the observed efficiencies, while biochar-immobilization had a weak effect but yielded an optimum response between 0.3-0.4 g/mL. The maximum crack width sealed was 0.65 mm. Through SEM-EDX and FTIR analyses, the biominerals precipitated in the cracks were identified to be mainly CaCO3. Furthermore, image analysis of the XCT scans of some of the healed geopolymers confirmed that their pulse velocities were indeed improving due to the filling of their internal spaces with biominerals. With that, there is potential in developing self-healing biogeopolymers using biochar-immobilized spores of bacterial cultures.

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Effects of microbial agents to the properties of fly ash-based paste

Cited by 7 publications

References 16 publications

Compressive Strength Investigations Of Foamed Mortar Incorporating Sandblasting Waste As Supplementary Cementitious Materials

Compressive Strength Investigations Of Foamed Mortar Incorporating Sandblasting Waste As Supplementary Cementitious Materials

Biomineralization Induced by Cells of Sporosarcina pasteurii: Mechanisms, Applications and Challenges

Self-Healing Biogeopolymers Using Biochar-Immobilized Spores of Pure- and Co-Cultures of Bacteria

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