Recently, significant events took place that added immensely to the sociotechnical pressure for developing sustainable composite recycling solutions, namely (1) a ban on landfilling in Germany 2009, (2) first major wave of wind turbines reaching their End-of-Life (EoL) and being decommissioned 2019–2020, (3) acceleration aircraft decommissioning due COVID-19 pandemic, (4) increase composites mass production cars, thanks development high volume technologies based thermoplastic composites....

Epoxies are often exposed to water due rain and humid air environments. Epoxy yellows during its service time under these conditions, even when protected from UV radiation. The material's color is not regained upon redrying, indicating irreversible aging mechanisms. Understanding what causes a discoloration of importance for applications where the visual aspect material significant. In this work, mechanisms cause yellowing were identified. Experiments performed using combination FT-NIR,...

Nonmetal doping is an effective approach to modify the electronic band structure and enhance photocatalytic performance of bismuth oxyhalides. Using density functional theory, we systematically examine fundamental properties single-layer BiOBr doped with boron (B) phosphorus (P) atoms. The stability models investigated based on formation energies, where substitutional found be energetically more stable under O-rich conditions than Bi-rich ones. results showed that P atoms reduced bandgap...

The risk related to embankment dam breaches needs be evaluated in order prepare emergency action plans. physical and hydrodynamic parameters of the flood wave generated from failure event correspond various breach parameters, such as width, slope, formation time. This study aimed simulate scenario Yabous (northeast Algeria) analyze its influence on areas (urban natural environments) downstream dam. simulation was completed using sensitivity analysis method assess impact flooding break...

Methyl red (MR) dye, one of the azo dyes, is mutagenic and its persistence has negative effects on environment people’s health. The current work first to demonstrate that methyl dye can be removed effectively sustainably, utilizing biomass derived from bark Dodonaea viscosa (Hopbush) plant. Hopbush shows effective adsorption MR, upto 73%, under optimized conditions in an aqueous medium. experimental were by examining effect time, initial concentration, pH ionic strength process Maximum...

The presence of dyes in water stream is a major environmental problem that affects aquatic and human life negatively. Therefore, it essential to remove dye from wastewater before its discharge into the bodies. In this study, Banyan (Ficus benghalensis, F. benghalensis) tree leaves, low-cost biosorbent, were used brilliant green (BG), cationic dye, an aqueous solution. Batch model experiments carried out by varying operational parameters, such as initial concentration solution, contact time,...

Long-term creep properties and the effect of water are important for fiber reinforced polymer (FRP) composite materials used in offshore applications. Epoxies often as a matrix material such composites. A typical design lifetime FRP structures is 25 or more years direct contact with leading to some deterioration properties. Knowing predicting extent property great interest designers users structures. It has been established that time-temperature superposition principle (TTSP) useful tool...

Abstract Fiber-reinforced polymers (FRP) are widely used in structural applications. Long-term properties of such materials exposed to water high concern and interest, especially for subsea offshore The objective this study is identify the mechanisms whether drop diamine-cured mixed DGEBA-HDDGE reversible upon drying material its initial content. interest mechanical strength, elastic fatigue performance, as well changes chemical structure. effect absorbed on resin evaluated, hygrothermal...

The dyeing industry uses many chemicals and dyes. After the dying process is completed, they release a significant amount of dyes in wastewater. dyes’ color emissions are extremely poisonous dangerous for aquatic terrestrial life. Due to toxic nature dyes, current study was carried out evaluate whether it would be effective employ an adsorption procedure with leaves from Adiantum capillus-veneris plant as adsorbent remove commonly used textile aqueous dye solution effect pH, concentration,...

This work investigates the combined effect of water immersion and temperature on interlaminar shear static fatigue strength glass fiber epoxy composites. Interlaminar tests were performed I-beam shaped samples which enable faster fluid saturation at 20, 40 60 °C, both in air immersion. Analysis parameters optical micrography enabled understanding phenomena that govern degradation for each case. The dry properties are dominated by matrix resistance room fiber/matrix interface higher...

In this study, the authors aimed at characterizing 11 Algerian kinds of honey taken from various geographical locations (beehives located Djelfa (Medjbara and Dzaira), Laghouat, Aflou, Medea, Tiaret, Sidi bel-Abbes, Ain-Safra, Mostaganem, El Bayadh, Ghardïa). The investigated physicochemical parameters these samples, including density, water content, electrical conductivity, ash pH, hydroxymethylfurfural (HMF) free acidity, color. obtained were found to be within acceptable ranges according...

Monitoring water content and predicting the water-induced drop in strength of fiber-reinforced composites are great importance for oil gas marine industries. Fourier transform infrared (FTIR) spectroscopic methods broadly available often used process quality control industrial applications. A benefit using such over conventional gravimetric analysis is possibility to deduce mass an absolutely dry material subsequently true content, which important indicator content-dependent properties. The...

Glass fiber-reinforced composites are exposed to hydrolytic degradation in subsea and offshore applications. Fiber-matrix interphase was observed after the matrix fully saturated with water typical absorption tests according ASTM D5229 were stopped. Due water-induced dissolution, fiber-matrix flaws formed, which then lead increased uptake. Cutting sample plates from a larger laminate, where fibers running parallel 1.5 mm long short edge, allowed process be studied. The analysis is based on...

COVID-19 causes acute respiratory illness in humans. The direct consequence of the spread virus is need to find appropriate and effective solutions reduce its spread. Similar other countries, pandemic has Algeria, with noticeable variation mortality infection rates between regions. We aimed estimate proportion people who died or became infected SARS-CoV-2 each provinces using a Bayesian approach. estimation parameters were determined binomial distribution along an priori distribution,...

Abstract BACKGROUND Arsenic in drinking water poses serious potential health risks more than 30 countries with total affected population of around 100 million people. The present study is devoted to the development innovative sorbents based on zeolite materials for As(V) sorption by modifying raw iron oxyhydroxide and manganese oxychloride. Natural clinoptilolite synthetic A were modified order obtain improved As(V). Sorption properties newly developed studied. Zeolites containing natural...

A novel method is proposed for interlaminar shear testing of marine composites, which accelerates fluid saturation: the I-beam short beam test. layered finite element (FE) model employed to explain nonlinear behavior experiment. Using this model, rectangular and results are compared, yielding consistent results. Dry saturated specimens also compared geometry proposed. The can simulate these effects enables attributing composite response plasticity resin rich inter-ply. In both dry...

Swelling in fiber-reinforced composites is anisotropic. In this work, dealing with glass fiber epoxy composite immersed distilled water, swelling coefficients are obtained each direction experimentally. behaviour the was constrained by non-swelling fibers and close to null, while transverse directions found occur freely—similar unconstrained polymer. An analytical method for predicting anisotropic from of matrix polymer reported work. The has an advantage that it simple use practice requires...

Glass fibres slowly degrade due to dissolution when exposed water. Such environmental aging results in the deterioration of mechanical properties. In structural offshore and marine applications, as well wind energy sector, R-glass fibre composites are continuously water humid environments for decades, with a typical design lifetime being around 25 years or more. During this lifetime, these materials affected by various temperatures, acidity levels, loads. A Dissolving Cylinder Zero-Order...

This study aims to analyze the chemical composition of Lioua’s groundwater in order determine geological processes influencing and origin its elements. Therefore, chemometrics techniques, such as multivariate statistical analysis (MSA) time series methods (TSM) are used. Indeed, MSA includes a component (PCA) cluster (CA), while autocorrelation (AA), supplemented by simple spectral density (SDA), is used for TMS. PCA displays three main factors explaining total variance (TV) 85.01 %. Factors...

Epoxy R-Glass Fiber-Reinforced Polymer (GFRP) composite plates were hydrothermally aged at 60 °C for 23, 75, and 133 days. The water content reached 0.97 wt%, 1.45 wt% 1.63 respectively. studied GFRP matrix was inert to hydrolysis or chain scission, allowing investigation of irreversible changes in the fiber-matrix interphase due hydrothermal aging upon re-drying. During each period, a subset specimens removed from bath dried chamber. weight loss drying explained with epoxy leaching...