Impact of UV–Vis light on the oxidation of bitumen in correlation to solar spectral irradiance data

Mirwald, Johannes; Nura, Drilon; Eberhardsteiner, Lukas; Hofko, Bernhard

doi:10.1016/j.conbuildmat.2021.125816

Cited by 36 publications

(11 citation statements)

References 15 publications

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“…Pengujian keselamatan listrik alat 5. Pengukuran spektral irradiance atau panjang gelombang foton dari suatu sumber cahaya dengan satuan μW/cm²/nm [16]. Semua data hasil pengukuran pada ke empat langkah diatas ditulis pada lembar kerja.…”

Section: Gambar 2 Diagram Alir Penelitianunclassified

Analisis Hasil Kalibrasi Alat Phototherapy Merk Gea Medical Type XHZ-90

Pertiwi¹,

Hadziqoh²,

Mustofa³

2022

JKFI

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Babies born prematurely always increase every year. For this reason, it is necessary to take proper care so that the baby remains in good health. One of the treatments for premature babies is phototherapy to reduce bilirubin levels in the baby's body. In order for the phototherapy process to run as expected, of course the phototherapy equipment used in the treatment must be of good quality and quality. For this reason, quality assurance and phototherapy equipment need to be carried out through a calibration process. In this study, calibration of the GEA medical type XHZ-90 phototherapy tool was carried out. Calibration is carried out by following the standard reference work method from the Ministry of Health in 2018. Calibration is carried out by checking the physical and function of the equipment which gains a weight of 10%, electrical safety inspection of the appliance with a weight gain of 36%, and measuring the performance of the instrument, namely spectral irradiance with a weight gain of 50%. . So that the total weight gain can be 96% and it can be concluded that this tool is functioning properly and within the tolerance limits of use. The uncertainty value in the measurement of spectral irradiance takes into account the sources of uncertainty types A and B. The combined uncertainty calculation from several sources for the measurement of spectral irradiance is 1.116. This value has met the uncertainty tolerance limit value of ≥ 4.

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Section: Gambar 2 Diagram Alir Penelitianunclassified

Analisis Hasil Kalibrasi Alat Phototherapy Merk Gea Medical Type XHZ-90

Pertiwi¹,

Hadziqoh²,

Mustofa³

2022

JKFI

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“…The spectroscopic techniques enable identifying chemical constituents, while the physical-chemical analysis by absorption in near-infrared is used in the processing control. Recent works of Hofko et al 3 and Mirwald et al 4 concern Fourier transform infrared (FT-IR) studies on bituminous binders. [2][3][4] Mirwald et al 5 performed fluorescence spectroscopy (FS) and microscopy.…”

Section: Introductionmentioning

confidence: 99%

“…Recent works of Hofko et al 3 and Mirwald et al 4 concern Fourier transform infrared (FT-IR) studies on bituminous binders. [2][3][4] Mirwald et al 5 performed fluorescence spectroscopy (FS) and microscopy. The studies of Koyun et al and Handle et al [6][7][8][9][10] concern the analysis by atomic force microscopy (AFM) and infrared spectroscopy, mass spectrometry, and rheological characterization.…”

Section: Introductionmentioning

confidence: 99%

Optical Characterization of Bitumen: Inspecting the Quantum Size Effect in the Nanostructured Phase

Duarte

Gepiak

2022

Appl Spectrosc

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Bitumen (BIT) is an oil sub-product with many applications. A variety of literature reports the analysis of its optical properties, as the fluorescence and the FTIR optical transmittance (OT). We have performed photoluminescence (PL) on the visible region of the spectrum and OT on the visible-NIR in solutions of BIT in toluene at different concentrations. The results revealed a non-linear, concentration-dependent effect attributed to intermolecular solvent-solute interactions. PL analysis of pure BIT as a function of the temperature and the laser pumping power pointed to the existence of nanosized crystalline inclusions on the amorphous BIT matrix with noticeable optical properties. The inference was confronted with the results of X-ray diffraction studies and literature reports. The possibility of the occurrence of a quantum size effect governing the luminescence is considered.

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“…It has been documented that amine-based antistripping agents lose their efficacy over time when exposed to heat and aging. , Aging is accelerated when heat is combined with UV. , UV irradiation causes significant oxidation for bitumen, leading to an increasing formation of ketones (such as α-ketone) and sulfoxides, which are typical signs of bitumen aging . Side reactions of amines with these chemical compounds can impact their intended reactions which is amines’ reacting with acidic compounds in bitumen.…”

Section: Introductionmentioning

confidence: 99%

“…11, 12 UV irradiation causes significant oxidation for bitumen, leading to an increasing formation of ketones (such as α-ketone) and sulfoxides, which are typical signs of bitumen aging. 13 Side reactions of amines with these chemical compounds can impact their intended reactions which is amines' reacting with acidic compounds in bitumen. Acidic compounds are implicated in moisture damage in bitumen composites such as those in asphalt pavements.…”

Section: ■ Introductionmentioning

confidence: 99%

Reducing the Carbon Footprint of Bituminous Composites Using Amine-Impregnated Zeolite

Mousavi

Aldagari

Seo

et al. 2022

ACS Sustainable Chem. Eng.

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Moisture damage in bituminous composites is a major concern, reducing the service life of infrastructures. The use of lime and amine-based additives to mitigate the damage has been practiced in the industry. Lime production is an inherently carbon-intensive process involving large quantities of CO2 emissions. Amine-based additives lose their effectiveness over time when exposed to weathering and UV irradiation. Inspired by the technology of amine-functionalized porous materials, here, we study the merits of using amine-impregnated zeolite in bituminous composites to protect amines from weathering and UV. We hypothesize that some of the ethylenediamine molecules loaded into the zeolite’s pores are gradually released into the matrix of bitumen, with the protection in the zeolite’s pores allowing the ethylenediamine molecules to maintain their effectiveness as antistripping agents until their release. Our laboratory experiments used the moisture-induced shear-thinning index to compare the moisture resistance of samples with amine-impregnated zeolite to samples with amines and zeolite added separately. Initially (before aging), the samples with amines and zeolite added separately have higher resistance to moisture damage compared to amine-impregnated zeolite (in which 52% of the total amines are retained in the zeolite). The superior performance of amine-impregnated zeolite is shown after short-term laboratory aging. After short-term aging and throughout long-term aging in the laboratory, the comparative resistance to moisture damage increasingly favored the amine-impregnated zeolite owing to the slow release of retained amines under an external stimulus induced by aging. This slow release of retained amines extends the effectiveness of the amines as the amines retained within zeolite pores are protected from early aging. Our quantum-based calculations using density functional theory (DFT) show that some small polar compounds of bitumen take advantage of stronger interactions with zeolite’s active sites to substitute for amine molecules; this could be a driving force for the gradual release of amine molecules from zeolite to the bitumen matrix. Our DFT studies on seven polar compounds of bitumen (quinoline, pyridine, benzofuran, benzoic acid, hexanal, 3-pentylthiophene, and hexanethiol) show that many of these compounds have stronger interactions with the zeolite model, particularly in the exterior walls of the intact sodalite cage ({111} face) and supercage-window sites, leading to deliver the loaded substance (ethylenediamine) into the medium. In contrast, amine molecules grafted onto the active sites of the broken sodalite cage ({100} cut) benefit from many H-bonding interactions at this active site, so these amine molecules are not easily substituted or released into the bitumen matrix.

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Impact of UV–Vis light on the oxidation of bitumen in correlation to solar spectral irradiance data

Cited by 36 publications

References 15 publications

Analisis Hasil Kalibrasi Alat Phototherapy Merk Gea Medical Type XHZ-90

Analisis Hasil Kalibrasi Alat Phototherapy Merk Gea Medical Type XHZ-90

Optical Characterization of Bitumen: Inspecting the Quantum Size Effect in the Nanostructured Phase

Reducing the Carbon Footprint of Bituminous Composites Using Amine-Impregnated Zeolite

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