Hydratation mechanism of a zinc phosphate cement and development of its mechanical profile

Jabri, Mohammed; Mejdoubi, E.; Gadi, M. El; Hammouti, B.

doi:10.1007/s11164-012-0824-2

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Only irreversible, large, broad, and overlapping endothermic signals could be detected ( Table A1 ( Appendix A ). The peak temperatures of the first double signal (121 and 177 °C) and the second peak around 303 °C were consistent with the literature and can be attributed to decomposition resulting from the release of free and bound water [ 24 ]. Slight differences between irradiated and unirradiated samples can be attributed to differences in weight loss of the manually perforated crucible lids and complex rehydration processes within the different mineral phases [ 24 ].…”

Section: Resultssupporting

confidence: 88%

Is Micro X-ray Computer Tomography a Suitable Non-Destructive Method for the Characterisation of Dental Materials?

et al. 2021

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The aim of the study was to investigate the effect of X-rays used in micro X-ray computer tomography (µXCT) on the mechanical performance and microstructure of a variety of dental materials. Standardised bending beams (2 × 2 × 25 mm3) were forwarded to irradiation with an industrial tomograph. Using three-dimensional datasets, the porosity of the materials was quantified and flexural strength was investigated prior to and after irradiation. The thermal properties of irradiated and unirradiated materials were analysed and compared by means of differential scanning calorimetry (DSC). Single µXCT measurements led to a significant decrease in flexural strength of polycarbonate with acrylnitril-butadien-styrol (PC-ABS). No significant influence in flexural strength was identified for resin-based composites (RBCs), poly(methyl methacrylate) (PMMA), and zinc phosphate cement (HAR) after a single irradiation by measurement. However, DSC results suggest that changes in the microstructure of PMMA are possible with increasing radiation doses (multiple measurements, longer measurements, higher output power from the X-ray tube). In summary, it must be assumed that X-ray radiation during µXCT measurement at high doses can lead to changes in the structure and properties of certain polymers.

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Section: Resultssupporting

confidence: 88%

Is Micro X-ray Computer Tomography a Suitable Non-Destructive Method for the Characterisation of Dental Materials?

et al. 2021

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“…( 3 ). At 100–230 °C, some hydrated zinc phosphate salts (Zn 3 (PO 4 ) 2 ·4H 2 O) such as hopeite formed after the evolution of cement during the water evaporation 13 . …”

Section: Resultsmentioning

confidence: 99%

Twigs-derived activated carbons via H3PO4/ZnCl2 composite activation for methylene blue and congo red dyes removal

Zubir

Zaini

2020

Sci Rep

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this work is aimed at evaluating the conversion of Pterocarpus indicus twigs into activated carbon via composite chemical activation for methylene blue and congo red dyes adsorption. the activated carbons were prepared by single-step chemical activation using zinc chloride and/or phosphoric acid at different mass impregnation ratios at 600 °C for 90 min. The activated carbons were characterized for textural properties and surface chemistry. The batch adsorption was investigated at different concentrations (5-1,000 mg/L), contact times (2-540 min) and temperatures (30-60 °C). Phosphoric acid-activated twigs carbon showed a high surface area of 1,445 m 2 /g with maximum methylene blue adsorption capacity of 438 mg/g. On the other hand, a composite-activated carbon yields a 217 mg/g of congo red removal. The adsorption data for both dyes fitted well with Langmuir and pseudo-second-order kinetics models, indicating the predominance of chemical adsorption through monolayer coverage of dye molecules on the homogenous surface of activated carbon. the thermodynamics properties of dye adsorption onto twigs-derived activated carbons indicated that the process is endothermic, spontaneous and favourable at high temperature. Overall, activated carbons derived from Pterocarpus indicus twigs could be effectively used for dye wastewater treatment. In many developing countries worldwide, textile industry is among the vast economy-driven activities with 2.8% rise in demand every year 1. However, it becomes a main contributor to water pollution issue that brings about multiple negative impacts to aquatic environment, ecological balance, and human health 2. The fabric sector consumes nearly several hundred thousand gallons of water every day, hence generating a large quantity of wastewater 3. Typical textile wastewater consists of nutrients such as phosphate, nitrates, micronutrients, and sources of carbon for algae cultivation 4. Yet, it also primarily includes colorants and auxiliary chemicals which are toxic and harmful, hence creating negative implications to the water streams 5. Dyestuff components are toxic, carcinogenic, and mutagenic. Generally, dye is persistent for a long duration because the molecular structure is complex and can withstand degradation by sunlight and microorganism in water. Additionally, dye in water can impede the penetration of sunlight, thereby reducing the rate of photosynthesis and consequently results in oxygen deficiency for respiration 6. Dyes can be categorized into anionic, cationic, and non-ionic. For example, methylene blue (basic blue 9) is among the prevalent cationic dyes used in the fabric sector and can cause damaging effects, primarily to the aquatic ecosystem and human health. Wastewater treatment strategies have been introduced to mitigate water pollution. Among others, adsorption outweighs other removal techniques because the process is simple, economical, and feasible for dye wastewater decontamination even at low concentration depending on the physicochemical properties of adsorbent...

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Preparation and characterization of low-activity coal bottom ash-based cementitious materials via orthogonal experiment

Li,

Bao,

Zhang

et al. 2024

Journal of Building Engineering

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Hydratation mechanism of a zinc phosphate cement and development of its mechanical profile

Cited by 3 publications

References 10 publications

Is Micro X-ray Computer Tomography a Suitable Non-Destructive Method for the Characterisation of Dental Materials?

Is Micro X-ray Computer Tomography a Suitable Non-Destructive Method for the Characterisation of Dental Materials?

Twigs-derived activated carbons via H3PO4/ZnCl2 composite activation for methylene blue and congo red dyes removal

Preparation and characterization of low-activity coal bottom ash-based cementitious materials via orthogonal experiment

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