scholarly journals Zeolite Tuff and Recycled Ceramic Sanitary Ware Aggregate in Production of Concrete

2019 ◽  
Vol 11 (6) ◽  
pp. 1782 ◽  
Author(s):  
Jacek Szulej ◽  
Paweł Ogrodnik ◽  
Beata Klimek
Keyword(s):  
Phase Composition ◽  
Bimodal Distribution ◽  
Sanitary Ware ◽  
Ceramic Ware ◽  
Sieve Analysis ◽  
Production Plant ◽  
Concrete Production ◽  
Aluminous Cement ◽  
Ceramic Sanitary Ware ◽  
The Impact

The article presents the results of research on the use of ceramic ware waste as aggregate in concrete production. Four concrete mixtures with aluminous cement were prepared, each with a different admixture of clinoptilolite. The only used aggregate was crushed waste ceramic sanitary ware obtained from a Polish sanitary fixture production plant. As part of the studies, a compressive test of cubic samples at different curing times ranging from 7 to 90 days was performed. Prior to the preparation of the samples, a sieve analysis and an elemental analysis of the obtained aggregate were conducted. In the framework of the testing, the bimodal distribution of clinoptilolite grains was determined, as well as its chemical composition. The conducted compressive tests demonstrated high strength of concrete containing ceramic aggregate and aluminous cement with an addition of clinoptilolite. In order to determine the impact that adding zeolite exerts on the phase composition and the structure of concrete samples, an analysis of the phase composition (XRD) and scanning electron microscopy examination (SEM) were performed. Furthermore, tests of abrasion, water penetration under pressure and frost resistance were conducted, determining particular properties of the designed mixtures. The abrasion tests have confirmed that the mixtures are highly abrasion-resistant and can be used as a topcoat concrete layer. The conducted tests of selected properties have confirmed the possibility of using waste ceramic cullet and a mineral addition of clinoptilolite in concrete production.

scholarly journals Work force retention: Role of work environment, organization commitment, supervisor support and training & development in ceramic sanitary ware industries in India

2016 ◽  
Vol 9 (3) ◽  
pp. 612 ◽  
Author(s):  
Umamaheswari S ◽  
Jayasree Krishnan
Keyword(s):  
Work Environment ◽  
Supervisor Support ◽  
Training And Development ◽  
Sanitary Ware ◽  
Mediating Effect ◽  
Organization Commitment ◽  
Ceramic Sanitary Ware ◽  
The Impact ◽  
The Relationship ◽  
And Training

Purpose: Although retention of employees has become hot topic in this career turbulent era, practically no empirical research is carried out in the fast growing ceramic sector till now and this research fills the gap in the literature. The literatures surveys reported that organization commitment is an important determinant of retention and work environment, supervisor support and training and development are the most relevant antecedents increasing commitment towards organization. This paper examines the impact of the above factors over organization commitment and explores the effects of organization commitment on retention, and verifies the mediating effect of organization commitment on the relationship between proposed factors and retention.Design/methodology/approach: A survey was completed by 416 employees working in five ceramic sanitary ware factories located at different places in India. Questionnaire consisting of items adopted from previous researches were used to collect data. The selection of respondents was based on the simple random sampling.Findings: Findings reveals that organization commitment influences retention and all the above factors enhances it. Moreover organization commitment partially mediates the relationship between proposed factors and retention. However multiple regression analysis indicated that training and development did not have any notable   influence on retention.Limitations: This study was conducted in a particular country and also in a particular sector of manufacturing industry, which limits generalization .Possibility of bias towards their organization and assumption that respondents know about their organization are other limitations.Implications: This paper offers recommendations to HR(Human resource) managers that they should extend their support to work environment, supervisor support and training and development in order to generate better relationship with employees and to reduce their likelihood of leaving the company.Originality/value: This article makes significant contribution to most turnover prone Indian environment, highlighting the important factors to be given priority for employee’s retention.

scholarly journals Impact of Water Quality on Concrete Mix and Hardened Concrete Parameters

2019 ◽  
Vol 29 (3) ◽  
pp. 174-182
Author(s):  
Wanda Kokoszka
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Sewage Water ◽  
Quality Parameters ◽  
Hardened Concrete ◽  
Production Plant ◽  
Recycled Water ◽  
Concrete Production ◽  
Concrete Mix ◽  
The Impact

Abstract The subject of the present article is the evaluation of the use of different water types in the production of concrete mix and C20/25 class concrete (assuming the same composition). Taking as an example a selected Subcarpathia-based concrete production plant, equipped with a process water management system, the research analysed the quantity-quality parameters of drinking water, sewage water, and groundwater and evaluated them for their accordance with mixing-water quality standards. It should be emphasised that the majority of specifications recommend the use of drinking water for concrete production. The paper presents the results of research which analysed the impact of water quality on selected properties of concrete mix and concrete (consistency; compressive strength after 7, 14, and 28 days; density). The results obtained confirmed the findings of the research on the suitability of recycled water for concrete production.

scholarly journals Evaluation of Marblewood Dust’s (Marmaroxylon racemosum) Effect on Ignition Risk

2021 ◽  
Vol 11 (15) ◽  
pp. 6874
Author(s):  
Miroslava Vandličkova ◽  
Iveta Markova ◽  
Katarina Holla ◽  
Stanislava Gašpercová
Keyword(s):  
Particle Size ◽  
Dust Particles ◽  
Wood Dust ◽  
Sieve Analysis ◽  
Granulometric Analysis ◽  
Analysis Measurement ◽  
Risk Research ◽  
Minimum Ignition Temperature ◽  
The Impact

The paper deals with the selected characteristics, such as moisture, average bulk density, and fraction size, of tropical marblewood dust (Marmaroxylon racemosum) that influence its ignition risk. Research was focused on sieve analysis, granulometric analysis, measurement of moisture level in the dust, and determination of the minimum ignition temperatures of airborne tropical dust and dust layers. Samples were prepared using a Makita 9556CR 1400W grinder and K36 sandpaper for the purpose of selecting the percentages of the various fractions (<63, 63, 71, 100, 200, 315, 500 μm). The samples were sized on an automatic vibratory sieve machine Retsch AS 200. More than 65% of the particles were determined to be under 100 μm. The focus was on microfractions of tropical wood dust (particles with a diameter of ≤100 µm) and on the impact assessment of particle size (particle size <100 µm) on the minimum ignition temperatures of airborne tropical dust and dust layers. The minimum ignition temperature of airborne marblewood dust decreased with the particle size to the level of 400 °C (particle size 63 μm).

Improvement of carotenoid bioaccessibility from spinach by co-ingesting with excipient nanoemulsions: impact of the oil phase composition

2019 ◽  
Vol 10 (9) ◽  
pp. 5302-5311 ◽  
Author(s):  
Kangfei Yao ◽  
David Julian McClements ◽  
Jiaxin Xiang ◽  
Ziying Zhang ◽  
Yong Cao ◽  
...  
Keyword(s):  
Phase Composition ◽  
The Impact

This study revealed the impact of the oil phase composition on carotenoid bioaccessibility when they were co-ingested with spinach, using an in vitro model.

Influence of Aluminous Cement on the Hardening Rate of Cement-Based Stucco Mortars

2016 ◽  
Vol 865 ◽  
pp. 57-61 ◽  
Author(s):  
Wojciech Siemiński ◽  
Marcin Kaczmarczyk
Keyword(s):  
Portland Cement ◽  
Setting Time ◽  
Experimental Studies ◽  
Cellulose Ether ◽  
Hydrophobic Properties ◽  
Content Ratio ◽  
Flow Table ◽  
Aluminous Cement ◽  
Hydrophobic Nature ◽  
The Impact

Renovation mortars used to restore damaged stucco elements are materials with special physical properties due to the nature of the work and environment in which they are applied. They must be characterized by low shrinkage, relatively short setting time, appropriate working properties and hydrophobic nature of hardened mortar. This paper analyzes the impact of mortar stucco ingredients on these parameters. The analysis was performed by experimental studies. The effect of the content ratio of aluminate cement to Portland cement on the change in mortar setting time was studied. Suitable workability of fresh mortar is achieved by the use of consistence-modifying additives. To assess this parameter, flow table method was applied in accordance with PN-EN 1015-3: 2000. The additives used were a system of thickeners, which included: cellulose ether in the form of hydroxyethylmethylcellulose and modified starch ether (starch 2-hydroxypropyl ether). Hydrophobic properties were obtained by the addition of triethoxyoctylsilane. The results were presented as graphs and tables. It was found that the ratio of aluminous cement to Portland cement most beneficial in terms of the setting rate of the resulting stucco mortar is 25% (m/m). This amount accelerates the end of setting time to 2 hours, the beginning of the setting time being 20 minutes. Suitable working characteristics were obtained by the addition of 0.080% of hydroxyethylmethylcellulose and 0.025% (m/m in dry mix) of starch 2-hydroxypropyl ether. Best hydrophobic properties of the hardened mortar was obtained by the addition of 0.075% (m/m in dry mix) of triethoxyoctylsilane.

scholarly journals Water-Dispersible Phytosterol Nanoparticles: Preparation, Characterization, and in vitro Digestion

2022 ◽  
Vol 8 ◽  
Author(s):  
Ao Li ◽  
Aixia Zhu ◽  
Di Kong ◽  
Chunwei Wang ◽  
Shiping Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Soybean Lecithin ◽  
Average Particle Size ◽  
Soy Protein Isolate ◽  
In Vitro Digestion ◽  
Bimodal Distribution ◽  
Average Particle ◽  
Food Ingredients ◽  
The Impact

For improving solubility and bioaccessibility of phytosterols (PS), phytosterol nanoparticles (PNPs) were prepared by emulsification–evaporation combined high-pressure homogenization method. The organic phase was formed with the dissolved PS and soybean lecithin (SL) in anhydrous ethanol, then mixed with soy protein isolate (SPI) solution, and homogenized into nanoparticles, followed by the evaporation of ethanol. The optimum fabrication conditions were determined as PS (1%, w/v): SL of 1:4, SPI content of 0.75% (w/v), and ethanol volume of 16 ml. PNPs were characterized to have average particle size 93.35 nm, polydispersity index (PDI) 0.179, zeta potential −29.3 mV, and encapsulation efficiency (EE) 97.3%. The impact of temperature, pH, and ionic strength on the stability of fabricated PNPs was determined. After 3-h in vitro digestion, the bioaccessibility of PS in nanoparticles reached 70.8%, significantly higher than the 18.2% of raw PS. Upon freeze-drying, the particle size of PNPs increased to 199.1 nm, resulting in a bimodal distribution. The solubility of PS in water could reach up to 2.122 mg/ml, ~155 times higher than that of raw PS. Therefore, this study contributes to the development of functional PS-food ingredients.

Modelling of phase transformations and hardening of carbonitrided steels

2004 ◽  
Vol 120 ◽  
pp. 129-136
Author(s):  
M. Przyłęcka ◽  
W. Gęstwa ◽  
G. E. Totten
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Abrasive Wear ◽  
Phase Transformations ◽  
Thermal Processing ◽  
Retained Austenite ◽  
Abrasive Wear Resistance ◽  
Processing Conditions ◽  
The Impact

There are a variety of opinions regarding the influence of retained austenite and carbides on the properties exhibited by carbonitrided steels. In this paper, the development of a model marking relationship between phase composition, and properties of hardened carbonitrided steel has been presented. A summary of the impact of structure on properties is provided in Table 1. In the study reported here, the impact of thermal processing conditions on retained austenite and carbides was examined for carbonitrided and hardened 20 (C22), 20H (20Cr4), 15HN (17CrNi6-6) and 16HG (16MnCr5) steels. The models that are reported were experimentally validated. In particular, the results obtained for structure with respect to hardness and abrasive wear resistance were discussed for carbonitrided and hardened 20H (20Cr4) steel.

scholarly journals Study of domestic coal-based dimethyl ether (DME) utilization to reduce LPG import

2018 ◽  
Vol 67 ◽  
pp. 01005
Author(s):  
Annisa Muliahati ◽  
Eva Fathul Karamah ◽  
Ika Kaifiah
Keyword(s):  
Dimethyl Ether ◽  
Energy Security ◽  
Production Plant ◽  
State Budget ◽  
Household Sector ◽  
Handling Cost ◽  
Shipping Cost ◽  
National Energy Security ◽  
The Government ◽  
The Impact

This study evaluates the utilization of domestic coal-based dimethyl ether (DME) to substitute 15% of the total household sector demand of LPG import projected to year 2040 and the impact to the saving of state budget. Maximum LPG-DME blending in this study is 85% - 15% weight. DME-LPG mixture price at depot will be calculated based on DME FOB price at production plant, shipping cost, mixing and handling cost. The result of the research shows that DME-LPG mixture price and the import LPG price at each depot are 391 USD/MT and 620 USD/MT at Depot Tanjung Priok, 390 USD/MT and 620 USD/MT at Depot Eretan, 396 USD/MT and 622 USD/MT at Depot Tanjung Perak, 397 USD/MT and 622 USD/MT at Depot Gresik, and 401 USD/MT and 624 USD/MT at Depot Semarang. The substitution of LPG import with domestic coal-based DME results the saving of state budget about 388 million USD (IDR 5,332 billion). It concludes that the utilization of domestic coal-based DME is economically feasible to reduce the import of LPG per metric ton (MT), obtain the saving for state budget, and help the government to decrease the dependency of import LPG to maintain the national energy security.

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