Properties of fly ash-based lightweight geopolymer concrete prepared using pumice and expanded perlite as aggregates

Publication date: Available online 16 October 2019Source: Journal of Molecular StructureAuthor(s): Soner Top, Hüseyin Vapur, Mahmut Altiner, Dogan Kaya, Ahmet EkicibilAbstractThe present paper aims to utilize the fly ash wastes with lightweight aggregates for geopolymer concrete production process in which sodium hydroxide (NaOH) and sodium metasilicate (Na2SiO3) were used as alkali activators, respectively. The designed experiments were examined by the Yates Analyses and so the productions of geopolymer concrete were investigated depending on curing temperature, solid/liquid rate and concentration of alkali activators. The curing temperature and alkali activator concentration were revealed as effective parameters in geopolymerization. The effects of expanded perlite (EP) and acidic pumice (AP) aggregates were discovered for the production of lightweight geopolymer concretes. The microstructural properties of each produced geopolymer concrete were characterized using SEM, EDS and laser particle size analyses. The specifications of the concrete were evaluated based on their uniaxial compressive strength (UCS), point load strength (PLS), sonic speed (SS), Mohs hardness (MH), and water absorption (WAR) ratio results. In addition, the effects of pre-wetting of EP aggregates, which have hydrophilic nature, were examined. To the best of our knowledge, this is the first time that pre-wetted lightweight EP aggregates were used to produce lightweight GP concretes. As a result of ...
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research

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Abstract Herein, through a facile and energy-friendly approach, thermally stable manganese-derived amorphous stacked nanosheet (MASNS) coatings with controlled wetting property ranging from superhydrophilicity to superhydrophobicity were synthesized. The superhydrophobic MASNS coating exhibited remarkable selectivity and sensitivity in the solid phase microextraction (SPME) of non-polar aromatic analytes, even amid the abundance of polar compounds, due to the superhydrophobic effect and the stacked lamellar structures. The established method was applied to the determination of polycyclic aromatic hydrocarbons (PAH...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
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Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
LangmuirDOI: 10.1021/acs.langmuir.9b03002
Source: Langmuir - Category: Chemistry Authors: Source Type: research
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Source: Drugs and Therapy Perspectives - Category: Drugs & Pharmacology Source Type: research
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Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research
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Source: Polymer - Category: Chemistry Source Type: research
Nocturnal enuresis (NE), or ‘bedwetting’, is a form of night-time urinary incontinence occurring in younger children. A diagnosis of NE can be socially disruptive and psychologically stressful for a child. The...
Source: BMC Pediatrics - Category: Pediatrics Authors: Tags: Study protocol Source Type: research
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Source: Current Urology Reports - Category: Urology & Nephrology Source Type: research
This article details and summarizes evidence about different diagnostic tests currently used to diagnose and predict Cushing's disease recurrence.
Source: Frontiers in Endocrinology - Category: Endocrinology Source Type: research
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Source: International Braz J Urol - Category: Urology & Nephrology Source Type: research
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