scholarly journals An Experimental Impact on Strength Enhancement and Properties of Concrete Using Magnetized Water

Author(s):  
Dhattiwala Vadid Ariz ◽  
Jigar Zala

The purpose of this analysis is to improve the eminence of water as per standards and to enhance the strength of concrete by replacing the normal water through magnetized water. An experimental program is set up to test the outcome of magnetized water with variations in the time of the water passing through the magnetic field. The physical as well as chemical characteristics of water ought to be tested for pH, Total hardness, Total dissolved solids (TDS), chlorides, etc. Test to be conducted on concrete are workability also compressive strength along with different properties of concrete. For this work, magnetized water was used during the concreting of grade M25. The obtained outcomes presented that the workability of mixtures mixed by magnetized water was higher. The compressive strength along with flexural strength of the mixture by means of magnetized water for mixing was noted to be progressive than the one mixed with the non-magnetized water. Also, the Sorptivity test performed on cylindrical discs shows conclusive evidence of capillary rise through pores.

2020 ◽  
Vol 14 (4) ◽  
pp. 1228-1240
Author(s):  
Mberdoum Memti Nguinambaye ◽  
Rasmata Nana ◽  
I. Alain Djinet ◽  
Zoumbiessé Tamini

La lentille de terre est une espèce en voie de disparition car sa culture demeure rudimentaire et traditionnelle. Aucun effort n’est fait pour améliorer cette culture. C’est pourquoi, elle n’occupe pas une place particulière en Afrique comme d’autres cultures vivrières. Ainsi, l’étude a consisté d’une part, à évaluer l’effet de stress sur le taux d’accumulation des composés biochimiques, et d’autre part, à évaluer les paramètres physiologiques et agronomiques dans les organes. Pour cela, 3 niveaux d’alimentation hydrique sont considérés : un stress hydrique sévère de 12 jours, un autre léger de 7 jours et une alimentation normale de 2 jours. L’expérimentation a été conduite en serre dans des pots avec un sol sablonneux. Un seul essai a été mis en place pour une durée de 125 jours. Des résultats obtenus, il ressort que le stress appliqué a perturbé sérieusement les plantes sous stress sévère. La chlorophylle est plus concentrée dans les feuilles des plantes stressées les rendant plus foncées. Un décalage de début de floraison et de cycle est observé chez les plantes stressées. Les plantes sévèrement stressées présentent des gousses de taille 2 fois plus grosses (3,5 cm) que celles des plantes témoins (1,8 cm). Les plantes stressantes ont des organes produisant une biomasse sèche plus faible que ceux des plantes témoins. Les taux des glucides et des protéines sont élevés dans les racines et les feuilles. L’étude a montré que la lentille de terre est riche en glucide et en protéine. Le stress a d’effet sur le rendement et la qualité des gousses. Il est judicieux d’envisager la mesure du degré de tolérance à la sécheresse.Mots clés : Déficit hydrique, organes, Macrotyloma geocarpum, taux d’accumulation, biomasse.   English Title: Some physiological and constituent parameters biochemical of the bodies of the ground lens (Macrotyloma geocarpum) in conditions of hydrous stressThe duckweed is an endangered species because its culture remains rudimentary and traditional. No effort is made to improve this culture. This is why it does not occupy a special place in Africa like other food crops. Thus, the study consisted, on the one hand, of evaluating the effect of stress on the rate of accumulation of biochemical compounds, and on the other hand, of evaluating the physiological and agronomic parameters in the organs. For this, 3 levels of water supply are considered: a severe water stress of 12 days, another mild of 7 days and a normal water supply of 2 days. The experiment was carried out in a greenhouse in pots with sandy soil. A single trial was set up for a period of 125 days. From the results obtained, it appears that the stress applied has seriously disturbed plants under severe stress. Chlorophyll is more concentrated in the leaves of stressed plants, making them darker. A delayed start of flowering and cycle is observed in stressed plants. The severely stressed plants have pods twice as large (3.5 cm) as those of the control plants (1.8 cm). Stressful plants have organs producing a lower dry biomass than those of control plants. Carbohydrate and protein levels are high in the roots and leaves. The study showed that the ground lentil is rich in carbohydrates and proteins. Stress affects the yield and quality of the pods. It is a good idea to consider measuring the degree of drought tolerance.Keywords: Hydrous deficit, bodies, Macrotyloma geocarpum, rate of accumulation biomass.


2012 ◽  
Vol 9 (4) ◽  
pp. 594-599
Author(s):  
Baghdad Science Journal

Seeds of Nigella sativa were sown in containers containing 15kg Loamy soil. The seeds were divided before sewing into two groups. The first group was soaked with ordinary tap water end the second group was treated with magnetized water for 24hrs. The irrigation process was completed until 75% of capacity field with two types of water (tap water of magnetized water with three replications).The magnetized water was obtained from special electric device designed for this purposeRecorded measurements (plants height, the number of branches/ plant, dry weight ofplant, number of flowers, 1000 seed weight) during the harvest period.Results indicated that the seed group which was treated with magnetized water was more significant than the one which was treated with the normal water in all the studied characteristics.


2014 ◽  
Vol 894 ◽  
pp. 45-49 ◽  
Author(s):  
Luisa Pani ◽  
Lorena Francesconi

In this paper an experimental program has been carried out in order to compare compressive strength fcand elastic static modulus Ecof recycled concrete with ultrasonic waves velocity Vp, to establish the possibility of employing nondestructive ultrasonic tests to qualify recycled concrete. 9 mix of concrete with different substitution percentage of recycled aggregates instead of natural ones and 27 cylindrical samples have been made. At first ultrasonic tests have been carried out on cylindrical samples, later elastic static modulus Ecand compressive strength fchave been experimentally evaluated. The dynamic elastic modulus Edhas been determined in function of ultrasonic wave velocity Vp; furthermore the correlations among Ed, Ec, fce Vphave been determined. It has been demonstrated that ultrasonic tests are suitable for evaluating different deformative and resisting concrete performances even when variations are small.


Oryx ◽  
1955 ◽  
Vol 3 (2) ◽  
pp. 64-70
Author(s):  
G. N. Zimmerli

The idea of a Swiss national park originated with the Swiss Society for Nature Research and this Society played the leading part in its realization. In 1906 the Society set up as part of its own organization a Swiss Nature Protection Commission and charged it to search for an area in Switzerland suitable for establishment as a reserve, in which all the animal and plant life could be protected against interference by man and so could be left entirely to the play of natural forces. It was not easy to find in Switzerland a suitably large area which still retained its original characteristics, was virtually free from human settlement, and contained some wealth of fauna and flora. After a careful survey of the whole country it became clear that the most suitable region was the Lower Engadine, with its isolated valleys on the eastern border of the country. The district in which, at the beginning of the century, bears had still lived was the one in which primitive nature could be found in its truest state.


2013 ◽  
Vol 357-360 ◽  
pp. 1082-1085 ◽  
Author(s):  
Kamarul Aini Mohd Sari ◽  
Sohif Mat ◽  
Khairiah Haji Badri ◽  
Muhammad Fauzi Mohd Zain

An experimental program was performed to obtain the density, compressive strength, and thermal conductivity of palm-based lightweight concrete. Palm-based polyurethane (PU) particles were used as lightweight aggregates in creating concrete systems. Concrete systems contain palm kernel oil-based polyol (PKO-p) reacted with 2,4-methylene diphenyl diisocyanate (MDI). In this study, polymer concrete was improved to achieve the optimum level of PU with the lowest possible density. The PU particles in the concrete mixture comprised of 1% to 5% w/w with density of less than 1800 kg/m3. The PU particles were 5 mm in size. The ratio of PKO-p to MDI was set at 1:1 and the loading of the concrete mixture was set at 3% w/w to produce lightweight concrete. The resulting concrete has excellent compressive strength (17.5 MPa) and thermal conductivity (0.24 W/mK). Results show that the PU particle dosage has the most significant effect on the physical and mechanical properties of concrete.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wasim Barham ◽  
Ammar AL-Maabreh ◽  
Omar Latayfeh

PurposeThe influence of using magnetic water instead of tap water in the mechanical properties of the concrete exposed to elevated temperatures was investigated. Two concrete mixes were used and cast with the same ingredients. Tap water was used in the first mix and magnetic water was used in the second mix. A total of 48 specimens were cast and divided as follows: 16 cylinders for the concrete compressive strength test (8 samples for each mix), 16 cylinders for the splitting tensile strength (8 specimens for each mix) and 16 beams to test the influences of magnetized water on the flexural strength of concrete (8 specimens for each mixture). Specimens were exposed to temperatures of (25 °C, 200 °C, 400 °C and 600 °C). The experimental results showed that magnetic water highly affected the mechanical properties of concrete. Specimens cast and curried out with magnetic water show higher compressive strength, splitting tensile strength and flexural strength compared to normal water specimens at all temperatures. The relative strength range between the two types of water used was 110–123% for compressive strength and 110–133% for splitting strength. For the center point loading test, the relative flexural strength range was 118–140%. The use of magnetic water in mixing concrete contribute to a more complete hydration process.Design/methodology/approachExperimental study was carried out on two concrete mixes to investigate the effect of magnetic water. Mix#1 used normal water as the mixing water, and Mix#2 used magnetic water instead of normal water. After 28 days, all the samples were taken out of the tank and left to dry for seven days, then they were divided into different groups. Each group was exposed to a different temperature where it was placed in a large oven for two hours. Three different tests were carried out on the samples, these tests were concrete compressive strength, flexural strength and splitting tensile strength.FindingsExposure of concrete to high temperatures had a significant influence on concrete mechanical properties. Specimens prepared using magnetic water showed higher compressive strength at all temperature levels. The use of magnetic water in casting and curing concrete can increase the compressive strength by 23%. Specimens prepared using magnetic water show higher splitting tensile strength at all temperatures up to 33%. The use of magnetic water in casting and curing can strengthen and increase concrete resistance to high temperatures, a significant enhancement in flexural strength at all temperatures was found with a value up to 40%.Originality/valuePrevious research proved the advantages of using magnetic water for improving the mechanical properties of concrete under normal conditions. The potential of using magnetic water in the concrete industry in the future requires conducting extensive research to study the behavior of magnetized concrete under severe conditions to which concrete structures may be subjected to. These days, there are attempts to obtain stronger concrete with high resistance to harsh environmental conditions without adding new costly ingredients to its main mixture. No research has been carried out to investigate the effect of magnetic water on the mechanical properties of concrete exposed to elevated temperature. The main objective of this study is to evaluate the effect of using magnetic water on the mechanical properties of hardened concrete subjected to elevated temperature.


2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Aly Ahmed ◽  
Medhat Shehata ◽  
Said Easa

An experimental work was conducted to study the use of factory-waste roof shingles to enhance the properties of fine-grained soil used in road works. Cement kiln dust (CKD), a cogenerated product of Portland cement manufacturing, was used as a stabilizing agent while the processed shingles were added to enhance the soil tensile strength. The effects of shingles on strength and stability were evaluated using the unconfined compressive strength, splitting tensile strength, and California Bearing Ratio (CBR) tests. The results showed that the use of CKD alone resulted in a considerable increase in the unconfined compressive strength but had a small effect on the tensile strength. The addition of shingles substantially improved the tensile strength of the stabilized soil. A significant reduction in the capillary rise and a slight decrease in the permeability were obtained as a result of shingle addition. An optimal shingle content of 10% is recommended to stabilize the soil.


2016 ◽  
Vol 697 ◽  
pp. 433-436
Author(s):  
Shi Chao Zhang ◽  
Yu Feng Chen ◽  
Wei Wu ◽  
Hao Ran Sun ◽  
Guang Hai Wang ◽  
...  

In this paper, fumed nano-silica as the main raw material, nano-silica insulation materials were prepared by the dry processing. Research on humidity-reinforcement of nano-Silica insulation materials has been carried out and analyzed. When hygroscopicity of samples reach to 23%, the compressive strength 1.65MPa is at twice the one without high humidity-reinforcement, while the thermal conductivities are almost the same. Then, the action mechanism of high humidity-reinforcement method was analyzed. In humidity-reinforcement method, as vapor enters, silica sol is formed in the gap between one aggregate particle and another, and various condensation polymerization occurred in the drying process, which lead to aggregates connection and compressive strength improvement.


2009 ◽  
pp. 201-207 ◽  
Author(s):  
Marijana Pesakovic ◽  
Dragutin Djukic ◽  
Leka Mandic ◽  
Milan Rakicevic ◽  
Rade Miletic

Over 2003-2005 period, a study was performed on the effect of different rates of NPK fertilizer of formulation 8:16:24 + 3% MgO (N1 - 400 kg ha-1; N2 - 600 kg ha-1; N3 - 800 kg ha-1; N4 - 1000 kg ha-1) on development of the soil fungi. The trial was set up in the experimental plum orchard established by Fruit Research Institute Cacak, and the laboratory of Department of Microbiology, Faculty of Agronomy Cacak. Unfertilized soil was used as the control soil. Each of the stated variants was carried out in three replications. The size of the basic plot was 68 m2. The effect of the studied mineral fertilizer rates was determined three times over the growing season, the number of fungi being checked by the indirect rarefaction method on Chapek nutritive medium. The results of the study inferred that the application of mineral fertilizers brought about the decrease in the number of fungi. Of all studied variants, the one with the highest nitrogen rate (variant N4) exhibited the strongest effect. The influence of the fertilizer was highest at the third sampling. Furthermore, the effect was highest in season 2003.


Wood Research ◽  
2021 ◽  
Vol 66 (4) ◽  
pp. 582-594
Author(s):  
FRANCISCO ANTONIO ROCCO LAHR ◽  
VINICIUS BORGES DE MOURA AQUINO ◽  
FELIPE NASCIMENTO ARROYO ◽  
HERISSON FERREIRA DOS SANTOS ◽  
SERGIO AUGUSTO MELLO SILVA ◽  
...  

The Brazilian standard ABNT 7190 (1997) establishes the strength classes C20, C30, C40 and C60 for the proper framework of the different wood types in the group of hardwoods. Associated with the strength class, which is based on the compressive strength characteristic value parallel to the fibers (fc0,k), the standard stipulates the respective values representing the stiffness (Ec0), with 19500 MPa being the reference value for the class C40, essential variables in structural design. For being the C40 class is the one with the greatest amplitude (20 MPa), it is possible that the value 19500 MPa is not the best representation of stiffness. This work aimed to verify the representativeness the stiffness value established by the Brazilian standard for C40 wood. The result obtained from the average confidence interval indicates the value of 14110 MPa as being the most representative, which may imply structures that are supposedly more rigid than they really are.


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