Effect of bio-additives on physico-chemical properties of fly ash-ground granulated blast furnace slag based self cured geopolymer mortars

Karthik, A.; Sudalaimani, K.; Vijayakumar, Chinnaswamy Thangavel; Saravanakumar, S. S.

doi:10.1016/j.jhazmat.2018.08.078

Cited by 73 publications

(21 citation statements)

References 28 publications

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“…SEM was used to study the physical property differences between JCC and FJCC at 1000× magnification. The sample preparation and photomicrography were performed according to Karthik et al (2019). The structural properties of JCC and FJCC were analyzed by FTIR spectrometer (Nicolet 8700, Thermo Fisher Scientific Inc., Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

Bio‐detoxification of Jatropha curcas L. cake by a soil‐borne Mucor circinelloides strain using a zebrafish survival model and solid‐state fermentation

Zhang

Chang

Tang

et al. 2020

J. Appl. Microbiol.

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Aims The aims of the study were to (i) improve the evaluation criteria of detoxifying Jatropha curcas L. cake (JCC), (ii) isolate and characterize a JCC tolerant strain, (iii) explore its JCC detoxifying potential. Methods and Results The zebrafish was employed as a survival model to screen the strains capable of detoxifying JCC. A strain identified as Mucor circinelloides SCYA25, which is highly capable of degrading all toxic components, was isolated from soil. Different solid‐state fermentation parameters were optimized by response surface methodology. The optimal values for inoculation amount, moisture content, temperature, and time were found to be 18% (1·8 × 106 spores g−1 cake), 66%, 26, and 36 days, respectively, to achieve maximum detoxification of the JCC (92%). Under optimal fermentation conditions, the protein content of JCC was increased, while the concentrations of ether extract, crude fiber, toxins, and anti‐nutritional substances were all degraded considerably (P < 0·05). Scanning electron microscopy and Fourier transform infrared spectrometer analysis revealed that the fermentation process could disrupt the surface structure and improve the ratio of α‐helix to β‐folding in the JCC protein, which may improve the digestibility when the detoxified JCC is used as a feedstuff. Conclusions Our results indicate that M. circinelloides SCYA25 is able to detoxify JCC and improve its nutritional profile, which is beneficial to the safe utilization of JCC as a protein feedstuff. Significance and Impact of the Study The newly identified M. circinelloides SCYA25 detoxified JCC in a safe manner to provide a potential alternative to soybean meal for the feed industry. These results also provide a new perspective and method for the toxicity evaluation and utilization of JCC and similar toxic agricultural by‐products.

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Section: Methodsmentioning

confidence: 99%

Bio‐detoxification of Jatropha curcas L. cake by a soil‐borne Mucor circinelloides strain using a zebrafish survival model and solid‐state fermentation

Zhang

Chang

Tang

et al. 2020

J. Appl. Microbiol.

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“…When it reacts with alkaline activators and is dissolved in it, and calcium content increases in GPC, it increases the strength and reduces the rate of workability [60][61][62]. RM substitution with GWS in minimal amounts improves cement particle dispersion in the mix, resulting in improved cement reactions and, ultimately, increases in strength and other concrete properties [10,59,63]. The GWS increase in reactive phases implies that the alkali fusion process resulted in physicochemical changes such as the breakage of specific crystal structures and the liberation of silica and alumina, which enhanced reactivity, leading to increased CS [48,64,65].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…When reacting with alkali, fly ash (FA) and ground granulated blast-furnaces slag (GGBS) produce an inorganic polymer binder through polymerization called a geopolymer [6,7]. Factors such as alkaline agents, particle size distribution, and particle size significantly affect the polymerization process [8][9][10]. It was reported that an increase in FA content as binding material increases the CS and substantially impacts the rheology property of GPC.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Alkaline Activator on the Strength Properties of Geopolymer Concrete

et al. 2022

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This study investigates the effects of red mud on the performance of geopolymer concrete in regard to fresh and mechanical properties. Red mud was used as a binder, and GGBS replaced the binder. Different proportions of red mud ranging from 0 to 30% with an interval of 2% and activator agents such as KOH and K2SiO3 for various alkaline-to-binder ratios such as 0.30, 0.40, and 0.50 were used; their effect on the fresh and mechanical properties of geopolymer concrete were the focusing parameter on the current study. Fresh properties such as setting time, slump, compaction factor, and vee-bee consistometer test, and mechanical properties such as compressive strength, split tensile strength, flexural strength, modulus of elasticity, and impact energy were studied. ANOVA and radar plot analysis were studied for various alkaline to binder (A/B) compressive strength results tested for 7 to 90 days. The increase of red mud quantity caused the decline of workability, but there was continuous enhancement of mechanical properties of GPC up to a specific limit. An alkaline-to-binder ratio of 0.4 shows excellent results compared with other ratios at ambient conditions for strength properties. ANOVA and radar plot reveal that A/B of 0.40 for 90 days shows excellent results compared with other ratios, and CS values vary in a linear manner.

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“…The content of cristobalite compounds which increased along with the increase in the P/A ratio and the SS/SH ratio showed that at the age of 28 days the geopolymer binder had a higher amorphous phase than when the specimen was 7 days old. [56,57].…”

Section: Compressive Strength (Mpa)mentioning

confidence: 99%

Mechanical Properties and Microstructure of Geopolymer Binder Based on Umeanyar Slatestone Powder

Astariani¹,

Salain²,

Sutarja³

et al. 2021

cea

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This research focuses on the mechanical and microstructure properties of geopolymer binder with slatestone waste as the base material. This geopolymer binder comes from industrial waste crushing slate in the Umeanyar area. This waste is processed into stone powder (USSP) which contains SiO 2 (49%), Al 2 O3 (11%), CaO (11.2%). This USSP uses a sodium hydroxide (SS) activator with a concentration of 14 M. The proportion of the mixture of precursor and activator (P/A) is 70%: 30%; 75%: 25%; 80%: 20% and alkaline activator Na 2 SiO 3 : NaOH (SS/SH) of 1:1; 1.5:1; 2:1, by weight. Samples of specimens were made in the form of a cube with a side of 50 mm and tested at the age of 7 and 28 days. Mechanical properties tested include density and compressive strength based on ASTM-C39. Meanwhile, the microstructural analysis used X-Ray Diffraction (XRD) and Scanning Electronic Microscope-Energy Dispersive X-Ray (SEM-EDX) analysis. The results of the density test were 1.90g/cm 3 and 1.85g/cm 3 respectively and the compressive strength test results were 7.40 MPa and 12.73 MPa at the age of 7 and 28 days, respectively.

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Effect of bio-additives on physico-chemical properties of fly ash-ground granulated blast furnace slag based self cured geopolymer mortars

Cited by 73 publications

References 28 publications

Bio‐detoxification of Jatropha curcas L. cake by a soil‐borne Mucor circinelloides strain using a zebrafish survival model and solid‐state fermentation

Bio‐detoxification of Jatropha curcas L. cake by a soil‐borne Mucor circinelloides strain using a zebrafish survival model and solid‐state fermentation

Optimization of Alkaline Activator on the Strength Properties of Geopolymer Concrete

Mechanical Properties and Microstructure of Geopolymer Binder Based on Umeanyar Slatestone Powder

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