New sampling method to improve the reliability of FTIR analysis for Self-Compacting Concrete

Witkowski, Hubert; Koniorczyk, Marcin

doi:10.1016/j.conbuildmat.2018.03.216

Cited by 40 publications

(17 citation statements)

References 18 publications

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“…This result supported EDX analysis. CaCO 3 peaks indicated that spectra of the SW0 for which the transmittance value corresponding to 1,410 cm −1 is slightly lower when compared to SW9 and SW12 mixes 77 . Moreover, transmittance values for SW9 and SW12 corresponding to 1,410 cm −1 is quite similar.…”

Section: Resultsmentioning

confidence: 93%

“… 77 3,640/3,643 cm −1 peaks present the Ca(OH) 2 consumption 78,79 . In addition, the lower transmittance value in the FTIR spectra, the higher the SiO, CaCO 3 , and Ca(OH) 2 content means 77 . According to wave number at 1,000 cm −1 , the amount of SiO in the HPM increases with increased SW content.…”

Section: Resultsmentioning

confidence: 96%

“…Typical units for FTIR spectra are wave numbers expressed with cm −1. 77 In this study, FTIR was applied to determine the SiO 2 , CaCO 3 , and Ca(OH) 2 contents of HPMs. The obtained FTIR spectra from SW0, SW9 and SW12 mixes are presented graphically in Figure 12.…”

Section: Resultsmentioning

confidence: 99%

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The effects of synthetic wollastonite developed with calcite and quartz on high performance mortars

Öz

Güneş

2020

Structural Concrete

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In this study, the effects on high performance mortar (HPM) of synthetic wollastonite (SW) mineral were researched. Through this work, firstly, wollastonite was synthetically obtained by a particular production method. Secondly, SW was utilized as cement replacement material from 0 to 12% by 3% steps of increment in the production of HPM. After determination of slump flow diameters of HPMs, mechanical and durability properties were observed at 28 and 90 days. Additionally, microstructural performance properties of HPMs designed with SW in the ratios 0, 9, and 12% was specified with TGA/DTA and FTIR analysis as well as SEM/EDX and XRD analysis. The test and analysis results showed that SW decreased the workability of HPMs. The improvement of the mechanical and durability properties of HPMs proceeded up to 9% of SW. Microstructural analysis showed that development effect of SW on the HPM can be attributed to its needle‐shaped structure.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 96%

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The effects of synthetic wollastonite developed with calcite and quartz on high performance mortars

Öz

Güneş

2020

Structural Concrete

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“…The vibrational peak deformations seen at the 2,800 to 3,000 cm −1 are due to vibrational consequence of phenolics, amino acids, carboxylic acids, and carbohydrates and reveals the existence of NH 3, O–H, and C–H bonds (Amanor‐Atiemoh et al., 2019; Sarpong et al., 2019; Tahir et al., 2017). Peak deformation of C = O occurring in the peak region 2,250 to 2,400 cm −1 is attributed to intensity of heat (Witkowski & Koniorczyk, 2018). Masek, Chrzescijanska, Kosmalska, and Zaborski (2014) and Tahir et al.…”

Section: Resultsmentioning

confidence: 99%

Acoustically‐aided osmo‐dehydration pretreatments under pulsed vacuum dryer for apple slices: drying kinetics, thermodynamics, and quality attributes

Amanor‐Atiemoh

Zhou

Wahia

et al. 2020

Journal of Food Science

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The research work investigates the effect of different pretreatment conditions (osmotic dehydration [OD], ultrasound [US], and ultrasound‐assisted osmotic dehydration [UOD]) on the drying kinetics modeling, thermodynamics, weight reduction, degradation kinetics of vitamin C, and color of apple slices under pulsed vacuum dryer (PVD). The findings showed that UOD pretreatment significantly improved drying time and increased weight reduction comparative to OD, US, and the control sample. Drying kinetics modeling revealed that the Hii model better described the drying kinetic behavior of the apple slices than the other nine mathematical models based on higher coefficient of determination (R2), root mean square error (RMSE), and reduced chi‐square (χ2). Analysis of vitamin C content revealed a 46.05%, 31.28%, and 25.95% retention for UOD, US, and OD, respectively, after drying. Second‐order kinetics could accurately predict the degradation kinetics of vitamin C compared to first‐order kinetics. Vitamin C degradation kinetics showed lower k‐value, higher D‐value (time required for 90% degradation), and half‐life indicating a higher retention of vitamin C content for UOD pretreatment compared to OD and US during drying. L*, b*, and chroma values of UOD were significantly (P < 0.05) higher compared to US, OD, and the control sample. Practical Application The findings of this study revealed that ultrasonic‐aided osmotic dehydration is a unique and novel pretreatment technique prior to drying, which significantly shortens drying time as a result of faster moisture/mass transfer, improves processing efficiency thereby reducing processing cost, improves quality parameters, and preserve phytochemicals. This makes the business operations of food processors competitive and as well provide value for customers.

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“…For example, according to Amanor‐Atiemoh et al (2019), Tahir et al (2017) and Sarpong et al (2019), the deformations (peaks) observed in the region of 2,800–3,000 cm −1 are ascribed to NH 3, OH, and CH; by virtue of the vibrational consequence of free amino acids, phenolics, carboxylic acids, and carbohydrates. Deformation of CO observed in the peak region 2,250–2,400 cm −1 is as a result of intensity of heat (Witkowski & Koniorczyk, 2018). More importantly, of the various functional groups, those associated with flavonoids and phenolics were of keen interest in this work.…”

Section: Resultsmentioning

confidence: 99%

Effect of simultaneous dual‐frequency ultrasound aided ethanolic pretreatment on drying kinetics, bioactive compounds, antioxidant activity, and physicochemical properties of apple slices using pulsed vacuum dryer

Amanor‐Atiemoh

Zhou

Mujumdar

et al. 2020

J Food Process Engineering

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This work aims at investigating effect of different pretreatments and varied temperature on the drying kinetics, bioactive compounds, antioxidant activity, microstructure and functional group of apple slices using pulsed vacuum dryer. Pretreated apple slices (Ethanol, US + W, and US + E) dried at varied temperature (60, 70, and 80°C) were analyzed to determine total phenolic content (TPC), total flavonoid content (TFC), 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH+), 2,2‐azino‐bis‐(3‐ethylbenzothiazoline‐6‐sulfonic acid (ABTS+), color, microstructure and FT‐IR spectroscopy. The findings revealed that US + E pretreatment significantly (p < .05) decreased drying time (20–33.33%). Activation energy and moisture effective diffusivity were 17.60–29.86 kJ/mol and 1.52–3.60 × 10−8 m2/s, respectively. Microstructure evaluation showed disruption of cells structure and microchannels formation but was more prominent in US + E pretreatment with noticeable larger pores and several microchannels. US + E pretreatment retained TPC (64.89–75.75 mg/100 g GAE dw), TFC (45.96–56.25 mg/100 g ER dw), DPPH+ (66.85–73.34%) and ABTS+ (62.58–71.17%) than Ethanol, US + W, and control and was further corroborated by the observed peaks as revealed by the FT‐IR spectroscopy. Color (L*, a*, b*, whiteness) was better retained by Ethanol and US + E pretreatments. US + E pretreatment decreased drying time and also preserved bioactive compounds, antioxidant activity and color of apple slices. Practical application Apples are popularly consumed fruits and confer various nutritional and health benefits to humans. Drying is the most common approach for apple processing and shelf life extension. However, drying often leads to a reduction in quality parameters as well as degradation of nutritional components of the apple. Novel pretreatment techniques like ultrasonic aided ethanolic pretreatment preceding to apple drying provides an added advantage over conventional drying methods in that it reduces dehydration time as a result of faster moisture removal, lowers energy consumption, improves process efficiency leading to industrial competiveness and it also preserves the nutritional and sensorial parameters of dried apple slices.

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New sampling method to improve the reliability of FTIR analysis for Self-Compacting Concrete

Cited by 40 publications

References 18 publications

The effects of synthetic wollastonite developed with calcite and quartz on high performance mortars

The effects of synthetic wollastonite developed with calcite and quartz on high performance mortars

Acoustically‐aided osmo‐dehydration pretreatments under pulsed vacuum dryer for apple slices: drying kinetics, thermodynamics, and quality attributes

Effect of simultaneous dual‐frequency ultrasound aided ethanolic pretreatment on drying kinetics, bioactive compounds, antioxidant activity, and physicochemical properties of apple slices using pulsed vacuum dryer

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