scholarly journals Adhesive Strength of Gypsum Composites with Lightweight Fillers

2021 ◽  
Vol 7 (2) ◽  
pp. 52-59
Author(s):  
Magdaléna Doleželová ◽  
Jitka Krejsová ◽  
Alena Vimmrová
Keyword(s):  
Fire Resistance ◽  
Adhesive Strength ◽  
Environmentally Friendly ◽  
Important Material

Gypsum composites with several types of lightweight fillers were studied. Gypsum starts to be more important material nowadays, because it is one of the most environmentally friendly building binders. Therefore, there are new ways of the larger utilization of gypsum based materials to be sought. Even though the use of fillers in the gypsum is generally not necessary, because gypsum (opposite to cement or lime) does not shrink, fillers can be used for economic reasons or to improve some other properties of the gypsum material, e.g. thermal or fire resistance. We studied the adhesive strength of gypsum composites, containing three types of lightweight fillers (perlite, expanded clay aggregate and recycled PUR) and compared them with the properties of gypsum mortar with siliceous sand. It was found, that the type of the filler has principal impact on the adhesive strength of the gypsum composite.

Effect of environmentally-friendly flame retardants on fire resistance and mechanical properties of rigid polyurethane foams

Polimery ◽  
2016 ◽  
Vol 61 (02) ◽  
pp. 113-116 ◽  
Author(s):  
Justyna Czech-Polak ◽  
Bartlomiej Przybyszewski ◽  
Maciej Heneczkowski ◽  
Andrzej Czulak ◽  
Maik Gude
Keyword(s):  
Mechanical Properties ◽  
Fire Resistance ◽  
Flame Retardants ◽  
Environmentally Friendly ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

scholarly journals Temperature Dependence of Adhesive Strength and Fire Resistance of Structural Glued Laminated Timber Beams

2013 ◽  
Vol 59 (4) ◽  
pp. 219-226 ◽  
Author(s):  
Toshiro Harada ◽  
Atsushi Miyatake ◽  
Daisuke Kamikawa ◽  
Yasushi Hiramatsu ◽  
Kenta Shindo ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Fire Resistance ◽  
Adhesive Strength ◽  
Glued Laminated Timber ◽  
Timber Beams

scholarly journals Pengaruh Variasi Bio Based Adhesive terhadap Kekuatan Peeling dan Shearing Kayu Pinus pada Adhesive Joint

2021 ◽  
Vol 12 (2) ◽  
pp. 251-257
Author(s):  
Mochammad Syamsul Ma’arif ◽  
◽  
Muhammad Fadlurahman ◽  
Khairul Anam
Keyword(s):  
Adhesive Strength ◽  
Test Specimen ◽  
Rubber Tree ◽  
Environmentally Friendly ◽  
Fracture Analysis ◽  
Natural Sources ◽  
Peeling Strength ◽  
Tree Sap ◽  
Shearing Strength ◽  
Synthetic Adhesives

The methods of joining engineering materials using adhesives is mostly implemented by using synthetic adhesives from non-renewable sources. Even though it has good joining performance, its poisonous nature and difficult to decompose naturally makes the adhesive needs to seek alternatives that are more environmentally friendly. Another reason is to support FAO campaigns for the use of environmentally friendly and biodegradable materials. One that has the potential to replace synthetic one is adhesives from natural sources such as gum rubber, jackfruit, and breadfruit. Because each natural sap has a different composition, the adhesive strength will also be different. Therefore it is necessary to examine the adhesive strength of each of these natural gums. In this research, natural adhesives (gums) and synthetic adhesives were used to joint pine wood as a test specimen. After joining, peeling and shearing tests on the specimens were carried out so that the mechanical strength of the joints for each adhesive variation was recognized. Fracture analysis was then performed to analyze the mechanism of joint failure for each adhesive variation. From this research, the highest peeling strength was obtained from rubber tree sap of 0.15 MPa, while the highest shearing strength was also obtained for rubber sap of 0.68 MPa.

Are BMP Criteria Really Environmentally Friendly

WRPMD'99 ◽  
1999 ◽  
Author(s):  
Larry A. Roesner ◽  
Robert W. Brashear
Keyword(s):  
Environmentally Friendly

Environmentally Friendly Preparation of Magnetic Composites Featuring Proteolytic Properties

INEOS OPEN ◽  
2020 ◽  
Author(s):  
N. A. Samoilova ◽  
Keyword(s):  
Enzyme Immobilization ◽  
Maleic Acid ◽  
Environmentally Friendly ◽  
Synthetic Polymer ◽  
Magnetic Composites ◽  
Interpolyelectrolyte Complex ◽  
Hydrolysis Rates ◽  
Poly Ethylene ◽  
Noncovalent Binding

The enzyme-containing magnetic composites are presented. The magnetic matrix for enzyme immobilization is obtained by sequential application of an amine-containing polysaccharide—chitosan and a synthetic polymer—poly(ethylene-alt-maleic acid) to the magnetite microparticles to form the interpolyelectrolyte complex shell. Then, the enzyme (trypsin) is immobilized by covalent or noncovalent binding. Thus, the suggested composites can be readily obtained in the environmentally friendly manner. The enzyme capacity of the resulting composites reaches 28.0–32.6 mg/g. The maximum hydrolysis rates of the H-Val-Leu-Lys-pNA substrate provided by these composites range within 0.60·10–7–0.77·10–7 M/min.

Method of high frequency therapy at cows' mastitis during machine milking

2020 ◽  
pp. 9-12
Author(s):  
Viktor E. Lyubimov ◽  
Keyword(s):  
Dairy Cows ◽  
Electromagnetic Fields ◽  
High Frequency ◽  
High Efficiency ◽  
Environmentally Friendly ◽  
Ultrahigh Frequency ◽  
Machine Milking ◽  
High Frequency Electromagnetic Field ◽  
Milking Machine ◽  
Methods Of Treatment

Health of dairy cows ensures human health, so it is important that dairy products do not contain antibiotics that are used to treat any inflammation, including mastitis. In Russia at present, the problem of mastitis in cows exists with both attached and loose housing of cows. Mastitis of dairy cows are the great problem in milking husbandry. Losses from mastitis in milk yield can reach 15-20%. The main reasons for the occurrence of nonspecific mastitis of cows are the shortcomings of the working components of the milking machine: the degree of deterioration of the nipple rubber and the violation of machine milking technology (the reduction in pre-milking time and vacuum fluctuations account for 70% of all causes). Treatment of mastitis with antibiotics is effective, but not environmentally friendly and unacceptable. For the treatment of inflammation of the udder, it is necessary to use more environmentally friendly methods of treatment, one of which is the exposure to ultra-high frequency electromagnetic field tested by medicine. Use of three types of medical-mobile milking machines with the same method of exposure to ultrahigh-frequency electromagnetic fields on cow's nipples through electrodes in milking cups: LPDA-1-UHF, LPDA-2-UHF and LPDA-UHF-30 M, is described in the article. Author proved that cows with subclinical forms of mastitis recovered faster during milking with exposure to the ultrahigh frequency than when treated by antibiotics, and milking with the ultrahigh frequency device helps to recover 82% of the affected quarters with clinical forms and 100% of cows with subclinical forms of mastitis or with udder irritation. The high efficiency of the method of exposure to electromagnetic fields of the ultrahigh frequency during machine milking by means of medical-mobile milking machines LPDA-UHF for the prevention and treatment of mastitis of cows was shown.

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