scholarly journals Evalutional of the Effect of Physically Magnetized Water on some Properties of Dental Stone

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Tap Water ◽  
Control Sample ◽  
Magnetized Water ◽  
Linear Setting ◽  
Control Samples

The Aims of Study: to study the effect of interaction of dental stone with tap water and physically magnetized water on two periods of time 24h and 12h to study the change in the physical properties of final product. Materials and Methods: We started prepare no. of control samples and other of samples interacted with physically magnetized water for two periods of time 24h and 12h, then we studied the liner setting expansion and compressive strength. Results: Results obtained from comparing control sample with that treated with physically magnetized water showed an increase in the compressive strength of physically magnetized group and decrease of linear setting expansion in comparison with that of control sample. Conclusion: Reaction of dental stone with physically magnetized water lead to change in some physical properties of dental stone.

scholarly journals Effect of Elevated Temperature on Compressive Strength and Physical Properties of Neem Seed Husk Ash Concrete

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1198
Author(s):  
Kizito Patrick Mwilongo ◽  
Revocatus Lazaro Machunda ◽  
Yusufu Abeid Chande Jande
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Control Sample ◽  
Plain Concrete ◽  
Neem Seed ◽  
Seed Husk ◽  
High Temperature Rise ◽  
Different Levels ◽  
Fire Outbreak ◽  
Better Than

High temperature rise mostly caused by a fire outbreak is currently becoming a threat that endangers concrete’s structural performance for buildings and the safety of occupants. The behavior of concrete after fire subjection has been of much interest for the structural materials design purposes. This study investigated the physical properties and the compressive strength of M25 concrete incorporating Neem Seed Husk Ash (NSHA), exposed to and through targeted different levels of temperature (200 °C to 800 °C) for a period of three hours in an electric furnace. The NSHA was produced by calcining neem seed husks at 800 °C for six hours and then sieved through the 125 μm sieve. Different amounts of NSHA were investigated while considering the plain concrete as the control sample. 150 concrete cubes of 150 mm sizes were cast and properly cured for 7 and 28 days. The experimental results show that the compressive strength of the 5% NSHA concrete exposed to temperatures up to 400 °C is 21.3% and 23.8% better than the normal concrete at 7 and 28 curing days, respectively. Surface cracks and spalling are noticeable at 600 °C and 800 °C for all samples considered in this study.

scholarly journals Effect of Magnetized Water on the Stability and Consolidation Compressive Strength of Cement Grout

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 275
Author(s):  
Huan-Xiao Hu ◽  
Chao Deng
Keyword(s):  
Compressive Strength ◽  
Tap Water ◽  
Cement Grout ◽  
Hardened Cement ◽  
Sem Images ◽  
Maximum Increase ◽  
Contact Points ◽  
Magnetized Water ◽  
Different Temperatures ◽  
The Stability

In this study, tap water is magnetized by a self-developed device. The conductivity and evaporation of magnetized water (MW) at different temperatures are tested to demonstrate the magnetization mechanism. The results show that the conductivity and evaporation of the magnetized water increase to different degrees compared with regular tap water (RW). The maximum increase in conductivity is 10.6%, and the maximum increase in evaporation is 25.6% and 16.7% at 50 and 80 °C, respectively. Cement grout samples with water-cement ratios (w/c) of 0.5 and 1.0 were prepared with magnetized water. The stability of the cement grout mixed with RW and MW under different magnetic conditions is tested. The compressive strength and SEM images of the hardened cement grout samples mixed with RW and MW (under optimum magnetic conditions) are compared. The cement grout prepared with MW has a higher stability compared to that of the control specimen, and the relative change of bleeding volume of the MW cement grout with w/c = 0.5 and 1 is 67.69% and 24.36%, respectively. MW has a positive effect on the consolidation compressive strength of cement grout. SEM images show that hardened cement grout with MW has more hydrate crystals, more compact filling space between cement particles, more contact points, and fewer voids compared to that of RW. The influence mechanism of MW on the stability of cement grout is analyzed, which provides a theoretical basis for the application of MW in the field of grouting engineering.

scholarly journals Substitution of aggregates by waste foundry sand: effects on physical properties of mortars

2021 ◽  
Vol 71 (343) ◽  
pp. e251
Author(s):  
B.A. Feijoo ◽  
J.I. Tobón ◽  
O.J. Restrepo-Baena
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Control Sample ◽  
Natural State ◽  
Capillary Absorption ◽  
Foundry Sand ◽  
Physical Behavior ◽  
Thermally Activated ◽  
Heat Treated ◽  
Waste Foundry Sand

The substitution of the normalized aggregate by residual foundry sand (WFS) was studied on the physical properties of mortars by means of resistance to compression and capillary absorption tests. The aggregate was replaced by WFS in its natural state (WFS), washed residual foundry sand (WFSW) and heat treated residual foundry sand (WFST). The WFS had a percentage of bentonite, which was sought to be thermally activated. It was found that the physical behavior of the mortars containing WFS and WFSW was similar to that of the control sample. The clay recovered from the sand washing was evaluated for its pozzolanic potential, it was found that, with the thermal treatment, the montmorillonite acquires pozzolanic behavior. Mortars with WFST presented a drop in compressive strength. The pozzolanic effect achieved in the clay was not reflected in the compressive strength of the mortars with WFST.

scholarly journals Magnetic Water Effect on Concrete Properties of Canal Lining

2018 ◽  
Vol 7 (4.20) ◽  
pp. 194 ◽  
Author(s):  
Raad Hoobi Irzooki ◽  
Ammar Saleem Khazaal ◽  
Zaid Imad Mohammed
Keyword(s):  
Surface Tension ◽  
Compressive Strength ◽  
Tap Water ◽  
Magnetic Field Effect ◽  
Irrigation Canal ◽  
Water Effect ◽  
Magnetized Water ◽  
The Cost ◽  
The Magnetic Field ◽  
Magnetic Water

The present research investigated the magnetic field effect on the properties of tap water and the magnetic water effect on some properties of the concrete used for irrigation canal lining, so, for this purpose, the absorption and seepage features of concrete will be studied. The magnetic water was obtained by passing the tap water through magnetized devices with three different intensities (3000, 5000, and 7000) Gauss for 120 minutes. Some properties of magnetized water such as surface tension, viscosity, conductivity, TDS, and pH were studied. The results show that the surface tension, viscosity and electric conductivity of treated water with three different magnetization intensities were decreased about (19-22)%, (4-5)% and (6-8)% respectively as compared with results of the tap water. Also, the results show that pH was increased about (8-10)%. The magnetized water effect on the properties of concrete like compressive strength, slump, absorption, and seepage were studied. The results show that using the magnetized water (with three different intensities) instead of the tap water increased the compressive strength of concrete between (3-17)% for age of 28 days, and increased the slump between (5-13)mm. This leads to the possibility of increasing the water-cement ratio, which is, means decreasing the cost of concrete at a specified value of compressive strength. Also, the results show that the absorption and seepage were decreased about (1-9.5) % and (2-20)% respectively.  

Analysis of shrinkage and creep behaviors in polymer-coated lightweight concretes

2016 ◽  
Vol 23 (1) ◽  
pp. 77-83 ◽  
Author(s):  
Alper Bideci ◽  
Özlem Sallı Bideci ◽  
Sabit Oymael ◽  
Hasan Yıldırım
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Control Sample ◽  
Shrinkage And Creep ◽  
Creep And Shrinkage ◽  
Positive Effect ◽  
Control Samples ◽  
Pumice Aggregates

AbstractThe creep and shrinkage properties of polymer-coated lightweight concretes were examined. Five-hundred-dose lightweight concretes were produced by coating pumice aggregates with three different polymers (Sonomeric1: SNMC, KB Pur 214: KBP, and Polipol3455: PLP). The 3-, 7-, and 28-day compressive strength values of the obtained lightweight concrete samples were determined, and the 840-h and 12-month creep and shrinkage deformations were measured. It was found that the ductility of the SNMC- and KBP-coated concrete samples increased, while their shrinkage deformation results decreased when compared with the control samples. In contrast, the ductility of PLP concrete samples decreased and the shrinkage deformation became higher. In conclusion, the use of SNMC- and KBP-coated pumice aggregates had a positive effect on the creep and shrinkage properties of the concrete. Furthermore, it was observed that the compressive strength values of the lightweight concretes made of the coated samples were higher than those of the control sample.

scholarly journals Physical Properties and Durability of Lime-Cement Mortars Prepared with Water Containing Micro-Nano Bubbles of Various Gases

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1902
Author(s):  
Małgorzata Grzegorczyk-Frańczak ◽  
Danuta Barnat-Hunek ◽  
Wojciech Andrzejuk ◽  
Jacek Zaburko ◽  
Monika Zalewska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Tap Water ◽  
Experimental Studies ◽  
Total Porosity ◽  
Capillary Absorption ◽  
Cement Mortars ◽  
Influence Of Water ◽  
Mixing Water

The paper presents the experimental studies on the effect of the water containing micro-nano bubbles of various gases on the physico-mechanical properties of lime-cement mortars. In total, 7 types of mortars were prepared: with water containing the micro-nano bubbles of O2, O3 or CO2 as 50% or 100% substitute of ordinary mixing water (tap water) and the reference mortar prepared using tap water. In order to determine the influence of water with micro-nano bubbles of gases, the consistency of fresh mortar and the physical properties of hardened mortar, i.e., specific and apparent density, total porosity, water absorption by weight and capillary absorption, were established. The mechanical strength of the considered mortars was studied as well by conducting the tests for flexural and compressive strengths following 14, 28 and 56 days. Reduced workability and capillary absorption were observed in the modified mortars within the range of 0.9–8.5%. The mortars indicated an increase in the flexural strength after 28 days ranging from 3.4% to 23.5% and improved compressive strength in 1.2–31%, in comparison to the reference mortar. The conducted studies indicated increased flexural and compressive strengths along with the share of micro-nano bubbles of gases in the mixing water.

scholarly journals The effect of using magnetized water on the percentage of cement in the Concrete mixture

2014 ◽  
Vol 11 (2) ◽  
pp. 605-613
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Field ◽  
Compressive Strength ◽  
Tap Water ◽  
Concrete Mixture ◽  
Magnetic Intensity ◽  
Fixed Amount ◽  
Concrete Mixtures ◽  
Magnetized Water ◽  
Magnetic Strength ◽  
The Magnetic Field

This research studied the effect of magnetized water in concrete preparation and its effect on the presenting of cement in concrete mixtures also to find the ability of reducing the amount of cement in preparing one cubic meter, this is not exceed than 10% in one mixture , The experiments showed the preparation of standard cubes from the concrete which was used two kind of water magnetized water which was prepared by passing the tap water through the systems of different magnetic strength in terms of (6000,9000) Gauss and the ordinary water . The velocity of water through the magnetic field, which gives us the highest value for the compressive strength, was up to 1m/sec. to determine the best magnetic intensity, we examined The compressive strength and workability of the concrete which is not effect on the efficiency of the structure because of reducing cement percentage. The tests for compressive strength on concrete mixture with magnetized water appeared an increase (24%) compared to the results of the control cubes with fixed amount of cement; also the cubes with less amount of cement showed an increase (22%) and both cases give us higher compressive strength and workability.

scholarly journals Performance of Fly Ash Geopolymer Concrete Incorporating Bamboo Ash at Elevated Temperature

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3404 ◽  
Author(s):  
Ishak ◽  
Lee ◽  
Singh ◽  
Ariffin ◽  
Lim ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Control Sample ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Air Cooling ◽  
Geopolymer Concrete ◽  
Water Cooling ◽  
Control Samples

This paper presents the experimental results on the behavior of fly ash geopolymer concrete incorporating bamboo ash on the desired temperature (200 °C to 800 °C). Different amounts of bamboo ash were investigated and fly ash geopolymer concrete was considered as the control sample. The geopolymer was synthesized with sodium hydroxide and sodium silicate solutions. Ultrasonic pulse velocity, weight loss, and residual compressive strength were determined, and all samples were tested with two different cooling approaches i.e., an air-cooling (AC) and water-cooling (WC) regime. Results from these tests show that with the addition of 5% bamboo ash in fly ash, geopolymer exhibited a 5 MPa (53%) and 5.65 MPa (66%) improvement in residual strength, as well as 940 m/s (76%) and 727 m/s (53%) greater ultrasonic pulse velocity in AC and WC, respectively, at 800 °C when compared with control samples. Thus, bamboo ash can be one of the alternatives to geopolymer concrete when it faces exposure to high temperatures.

scholarly journals Effect of Water Dilution on Full-Arch Gypsum Implant Master Casts

Prosthesis ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 266-276
Author(s):  
James L. Sheets ◽  
Alvin G. Wee ◽  
Bobby Simetich ◽  
Mark W. Beatty
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Knoop Hardness ◽  
Compressive Modulus ◽  
Type Iii ◽  
Type Iv ◽  
Excess Water ◽  
Type V ◽  
Linear Setting ◽  
Water Dilution

The objective of this study was to assess if the setting expansion, compressive strength, compressive modulus and Knoop hardness is reduced in Type III, IV and V gypsum products when excess water is added to recommended water/powder (W/P) ratios for full-arch implant master casts. Four properties were measured: linear setting expansion, compressive strength, compressive modulus, and Knoop hardness. Three dental stones were evaluated: ISO Type III, Type IV, and Type V. Water was added to recommended W/P ratios as follows: (1) 0%, the manufacturer’s recommend W/P ratio, (2) 50%, 1.5 times the manufacturer’s recommendation of water, (3) 100%, three times the manufacturer’s recommendation of water, (4) 150%, 2.5 times the manufacturer’s recommendation of water, and (5) 200%, three times the manufacturer’s recommendation of water. For all three gypsum types, 50% water additions minimally affected the setting expansion and compressive modulus (p > 0.05), but lowered compressive strength by 26% to 52% (p < 0.05). Knoop hardness was lowered by 24% and 48% for Types V and III (p < 0.05), whereas Type IV was not significantly affected (p > 0.05). With few exceptions, the physical properties for the three gypsum types reached minimum values at 100% dilution, with few changes noted at higher dilutions. Increased W/P ratios did not adequately reduce the setting expansion and adversely affected other physical properties. Of the gypsums tested, Type IV is still recommended due to its lower setting expansion for full-arch implant master casts.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

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