scholarly journals Сriteria for research of the process of dispersion of the system of hydrate lime-water

2020 ◽  
Vol 3 (2) ◽  
pp. 23-27
Author(s):  
A. I. Zahrai ◽  
◽  
Z. I. Borovets ◽  
I. V. Lutsyuk ◽  
Ya. M. Novitskyi ◽  
...  
Keyword(s):  
Dynamic Viscosity ◽  
Water System ◽  
Hydrated Lime ◽  
Vibration Method ◽  
Slowing Down ◽  
Hydrate Lime ◽  
Lime Water ◽  
Slaked Lime ◽  
Rotary Viscometer

The process of dispersion of slaked lime in a vibrating activator of the bunker type is investigated. The nature of the change in the viscosity of lime dough during machining by vibration and rotary viscometer has been studied. It is established that the process of vibroactivation of hydrated lime successively goes through the stages of proportional growth of dynamic viscosity, slowing down its growth and cessation of dispersion. The efficiency of using the vibration method for determining the viscosity of the hydrated lime – water system is shown.

Metrological characteristics of the frequency method for measuring the viscosity of magnetorheological fluids in a rotary viscometer

2020 ◽  
pp. 28-33
Author(s):  
E.S. Belyaev ◽  
A.V. Vanyagin ◽  
B.A. Gordeev ◽  
V.I. Erofeev ◽  
S.N. Okhulkov
Keyword(s):  
Dynamic Viscosity ◽  
Torsion Angle ◽  
Viscoelastic Medium ◽  
Twist Angle ◽  
Magnetorheological Fluid ◽  
Magnetorheological Fluids ◽  
Metrological Characteristics ◽  
Beat Signal ◽  
Frequency Method ◽  
Rotary Viscometer

A frequency method for measuring the dynamic viscosity of rheological media is described using the example of a magnetorheological fluid. The method is based on the principle of operation of a rotary viscometer, in which the torsion angle depends on the characteristics of the viscoelastic medium. Keywords frequency method, dynamic viscosity, torque, beat signal, methodical error, resolution, accuracy, twist angle, torsion. [email protected]; [email protected]

Mineral phases formation on the pozzolan/lime/water system

2009 ◽  
Vol 43 (3-4) ◽  
pp. 331-335 ◽  
Author(s):  
Rosario García ◽  
Raquel Vigil de la Villa ◽  
Olga Rodríguez ◽  
Moisés Frías
Keyword(s):  
Water System ◽  
Mineral Phases ◽  
Lime Water

Mechanism of hydration of the metakaolin–lime–water system

2001 ◽  
Vol 31 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Joseph Cabrera ◽  
Moisés Frı́as Rojas
Keyword(s):  
Water System ◽  
Lime Water

scholarly journals Combined Effect of Different Flower Stem Features on the Visiting Frequency of the Generalist Ant Lasius niger: An Experimental Study

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1026
Author(s):  
Elena V. Gorb ◽  
Stanislav N. Gorb
Keyword(s):  
Experimental Study ◽  
Calcium Carbonate ◽  
Negative Impact ◽  
Hydrated Lime ◽  
Lasius Niger ◽  
Sugar Syrup ◽  
Slaked Lime ◽  
Flower Stem ◽  
Different Types ◽  
Physical Barriers

In order to understand the effects of the morphology and surface texture of flower stems in Smyrnium rotundifolium on the visiting frequency of generalist ants, we conducted experiments with Lasius niger ants running on dry wooden sticks mimicking different types of stems: (1) intact (grooved) sticks; (2) sticks painted with slaked (hydrated) lime (calcium carbonate coverage) imitating plant epicuticular wax coverage; (3) intact sticks with smooth polyester plate-shaped cuffs imitating upper leaves; and (4) intact sticks bearing cuffs painted with slaked lime. Ants were attracted by the sweet sugar syrup droplets placed on a stick tip, and the number of ants visiting the drops was counted. Our data showed significant differences in the visiting frequencies between the different types of stem-mimicking samples. The number of recorded ants progressively decreased in the following order of samples: intact sticks—painted sticks—sticks with intact cuffs—sticks with painted cuffs. These results clearly demonstrated that micro/nanoscopic surface coverages and macroscopic physical barriers, especially if combined, have a negative impact on the attractiveness of stems to ants. This study provides further evidence for the hypothesis that having a diversity of plant stems in the field, generalist ants prefer substrates where their locomotion is less hindered by obstacles and/or surface slipperiness.

scholarly journals Determination of optimal parameters of vibrо-activation of hydrated lime

2021 ◽  
pp. 25-31
Author(s):  
A.I. Zahrai ◽  
◽  
Z.I. Borovets' ◽  
I.V. Lutsyuk ◽  
Yа.M. Novitskyi
Keyword(s):  
Mechanical Activation ◽  
Comparative Studies ◽  
Hydrated Lime ◽  
Cement Stone ◽  
Activation Process ◽  
Optimal Parameters ◽  
Design Features ◽  
Degree Of Dispersion ◽  
Lime Water

The method of mechanical activation of hydrated lime in a vibrating activator of bunker type was offered in this work. The influence of design features and angle of fixing of vibrating blades on the speed and degree of dispersion of hydrated lime was investigated by measuring the change in the logarithmic decrement of mass attenuation during vibro-activation. The effect of the duration of the vibro-activation process on the dispersion in the system "hydrated lime–water" was studied. The efficiency of lime dispersion was shown in the case of mounting the blades at the angle of 860 for 40–60 minutes. Comparative studies of the strength of cement stone showed that the addition of vibro-activated hydrated lime in an amount of 2 wt.% leads to an increase in the strength of lime-cement compositions.

Disinfectant properties of slaked lime with sodium chloride

2020 ◽  
pp. 15-17
Author(s):  
Magomedzapir S. Saypullaev ◽  
◽  
Artigat M. Batyrova ◽  
Tamila B. Mirzoeva ◽  
Ali U. Koychuev ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Sodium Chloride ◽  
Rough Surfaces ◽  
Wide Spectrum ◽  
Hydrated Lime ◽  
Coli Strain ◽  
Aureus Strain ◽  
Foaming Agent ◽  
Slaked Lime ◽  
Lime Solution

The search of new disinfectants with a wide spectrum of antimicrobial activity of low toxicity and not hazardous in use, not requiring of creation of special storage conditions, convenient in use and not adversely affecting on processed items, affordable, is an urgent task of veterinary science. The article presents the results of laboratory tests of new bactericidal compositions, which include: 20% hydrated lime, 1.3 and 5% sodium chloride, as well as foaming agent PO-6K on test surfaces made of stainless steel, galvanized gland, tile, wood and concrete. As a test of microorganisms, museum cultures of E. coli (strain 1257) and Staphylococcus aureus (strain 209-P) were used. During the experiments, disinfection regimes were established (concentration, exposure, consumption of disinfectant) for disinfecting of smooth and rough test surfaces. At the same time, it was found that slaked lime solutions of 10 and 15% concentration did not have disinfecting activity even after triple whitening or irrigation of test surfaces contaminated with E. ooli (strain 1257), St. aureus (strain 209-P) at a rate of 0,5 l/m2 for smooth and 1 l/m2 - for rough surfaces. 20% solution of slaked lime, which destroys only Escherichia coli on smooth surfaces in 3 hours of exposure at the rate of 0,5 l/m2, and rough surfaces in 24 hours of exposure at the rate of 1,0 l/m2, has a disinfecting effect. At the same time, adding 1,3 and 5% sodium chloride to the slaked lime solution, the disinfecting activity of slaked lime also increases sharply; adding to 20% slaked lime 3 and 5% sodium chloride disinfects Escherichia coli and staphylococcus in 3 hours, based on smooth 0,5 l/m2, and for rough surfaces - 1 l/m2. Studies have also found that the addition of 3-5% sodium chloride, 5% foaming agent to 20% slaked lime solution reduces the consumption of the disinfectant in 2 times without reflecting the indicators of disinfection efficiency. When a foaming agent is added to the solution, the resistance (adhesion) of the foam on the vertical and ceiling surfaces increases on 14-18 minutes, and on the floor the foam is held in 1-1,5 hours, which helps to reduce the runoff of the solution.

scholarly journals Physicochemical properties of the new drug Penox-1

2021 ◽  
Author(s):  
A.M. Batyrova ◽  
M.S. Saypullaev
Keyword(s):  
Surface Tension ◽  
Sodium Chloride ◽  
Physicochemical Properties ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Foam Stability ◽  
Chloride Content ◽  
Hydrated Lime ◽  
Foam Layer ◽  
Slaked Lime

The physicochemical properties of the substances included in the composition of the new disinfectant Penox-1 have been studied. Assessment of its disinfecting properties of veterinary in-spection objects, with the study of solubility in water and sodium chloride, surface tension of solutions, stability and adhesion of foam on vertical and ceiling test surfaces in laboratory conditions. At the initial stage, the temperature dependence of the solubility of slaked lime in water was es-tablished. It was determined by the change in the activity of OH- ions as the temperature of the over-saturated solution of slaked lime increased. Distilled water was used as a solvent. The solubility of slaked lime was also studied by adding 1.0; 3.0; 5.0 and 10.0 % sodium chloride solution. The experi-ments were carried out according to the method "On the procedure for testing new disinfectants for veterinary practice (1987)". Assessment with the study of the surface tension of solutions, resistance and adhesion of foam was carried out at the Institute of Physics, DSCRAN, also according to the indi-cated method. As a result of the experiments, it was found that with an increase in water temperature, the sol-ubility of slaked lime in it decreases. Adding 1 and 3% sodium chloride solution to a 90 % solution of slaked lime, the solubility increases by 2.15 and 2.2 times, respectively. With an increase in sodium chloride content to 5%, the solubility of hydrated lime begins to decrease. The presence in the solution of 20 % slaked lime and 3 % sodium chloride solution, 5 % foaming agent (PO-6k) reduces surface ten-sion and increases foam stability. It was also found that the thickness of the foam layer depends on the type of surface. The critical thickness of the foam layer on vertical surfaces was from 1 to 4 cm, on the ceiling – from 2 to 7 cm. The stability of the foam depends on its concentration in the solution. The foam content up to 5–6 % in the solution increased the resistance on vertical surfaces up to 16 minutes, and on ceiling surfaces up to 18 minutes.

Compressive Strength and Ultrasonic Pulse Velocity of Mortars and Pastes, Elaborated with Slaked Lime and High Purity Hydrated Lime, for Restoration Works in México

2020 ◽  
Vol 862 ◽  
pp. 51-55
Author(s):  
Elena Guadalupe Navarro-Mendoza ◽  
Elia Mercedes Alonso-Guzmán ◽  
Jose Luis Ruvalcaba-Sil ◽  
Adrià Sánchez-Calvillo ◽  
Wilfrido Martínez-Molina ◽  
...  
Keyword(s):  
Compressive Strength ◽  
High Purity ◽  
Ultrasonic Pulse Velocity ◽  
Hydrated Lime ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Powder Surface ◽  
Slake Lime ◽  
Knowing That ◽  
Slaked Lime

Restoration works for the cultural heritage in México have commonly used traditional materials, being the slake lime one of the main solutions employed. Nevertheless, other lime products have not been studied or applied in patrimonial works. The main objective of this research was to verify if high purity limes can be used as an alternative for restoration works, knowing that they have a higher powder surface area and consequently great efficiency. Compressive strength and ultrasonic pulse velocity tests, (UPV), were carried on specimens of slaked lime and high purity limes in pastes and mortars, to compare the values obtained and decide in which restoration works they could be employed. Results showed a better performance of the high purity lime in mortars and slightly better values of the slaked lime for pastes.

scholarly journals Excessive Additive Effect On Engine Oil Viscosity

2014 ◽  
Vol 62 (5) ◽  
pp. 1015-1020 ◽  
Author(s):  
Vojtěch Kumbár ◽  
Jiří Votava
Keyword(s):  
Mathematical Models ◽  
Dynamic Viscosity ◽  
Engine Oil ◽  
Coefficient Of Determination ◽  
Oil Viscosity ◽  
Automotive Engine ◽  
Used Engine Oil ◽  
Experimental Values ◽  
Rotary Viscometer ◽  
Exponential Fit

The main goal of this paper is excessive additive (for oil filling) effect on engine oil dynamic viscosity. Research is focused to commercially distribute automotive engine oil with viscosity class 15W–40 designed for vans. There were prepared blends of new and used engine oil without and with oil additive in specific ratio according manufacturer’s recommendations. Dynamic viscosity of blends with additive was compared with pure new and pure used engine oil. The temperature dependence dynamic viscosity of samples was evaluated by using rotary viscometer with standard spindle. Concern was that the oil additive can moves engine oil of several viscosity grades up. It is able to lead to failure in the engine. Mathematical models were used for fitting experimental values of dynamic viscosity. Exponential fit function was selected, which was very accurate because the coefficient of determination R2 achieved high values (0.98–0.99). These models are able to predict viscosity behaviour blends of engine oil and additive.

DISINFECTION EFFECTIVENESS OF SLAKED LIME WITH NATRIUM CHLORIDE

1970 ◽  
pp. 58-61
Author(s):  
M. S. Saypullaev ◽  
A. M. Batyrova
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Sodium Chloride ◽  
Chloride Solution ◽  
Rough Surfaces ◽  
Hydrated Lime ◽  
Smooth Surfaces ◽  
Slaked Lime ◽  
Lime Solution ◽  
And Staphylococcus Aureus

Veterinary practice constantly needs highly effective, environmentally friendly, economically viable, non-specific means of protecting of animals from infectious diseases. It is known that various disinfectants are used for disinfection by irrigation, including: 5% hot solution of soda ash, 3% hot emulsion of disinfecting creolin, 1-2% formaldehyde solution, 2% sodium hydroxide solution, 5% chloramine solution, 1% glutaric solution aldehyde and others, calculation 0.5-1.0 l/m2 of the surface of the objects of veterinary surveillance. The disadvantage of these disinfectants is that many of them are toxic for humans and animals, have very irritating actirn on the respiratory tract, as well as the mucous membranes of the eyes. Also is known a disinfectant calcium hydroxide (slaked lime) of 10-20% concentration for the disinfection of objects of veterinary surveillance. This tool in comparison with the above mentioned is not particularly toxic and environmentally unsafe for the environment. The disadvantage of slaked lime is the low bactericidal activity against infectious diseases of the 1,2,3 category of resistance. It was found that 10% and 15% solutions do not disinfect Escherichia coli (pcs. 1257) and Staphylococcus aureus (pcs. 209 r), and 20% solution of hydrated lime disinfects Escherichia coli only after cross-application in 3 hours on smooth surfaces (stainless steel, galvanized iron, tile) and after 24 hours on rough surfaces (wood, concrete), at the rate of 1.0 l/m2. To increase the bactericidal and disinfection activity, 1.3 and 5% sodium chloride solution was added to a solution of 20% slaked lime. In this case, calcium chloride (CaCl2) and sodium hydroxide (NaOH) are formed, which can increase the disinfection activity by increasing the ionic strength of slaked lime solution. As experiments showed, the addition of 1% solution of sodium chloride in 20% solution of hydrated lime contributed to the disinfection of Escherichia coli and Staphylococcus aureus for 3 hours of exposure at rate of 0.5 l/m2, and rough -for 3 hours, at a rate of 1.0 l/m2. When 3% sodium chloride solution was added to 20% slaked lime solution, disinfection of smooth surfaces from Escherichia coli occurred in 1 hour, on rough surfaces in 3 hours at the rate of 0.5 and 1.0 l/m2, respectively. Staphylococcus aureus was disinfected on smooth surfaces in 3 hours at a rate of 0.5 l/m2, and on rough surfaces in 3 hours at a rate of 1.0 l/m2.

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