scholarly journals Properties of hydrated cement with complex additive

2020 ◽  
Vol 22 (4) ◽  
pp. 147-156
Author(s):  
O. V. Dem'yanenko ◽  
N. O. Kopanitsa ◽  
Yu. S. Sarkisov ◽  
N. P. Gorlenko
Keyword(s):  
Water Resistance ◽  
Water System ◽  
Physicochemical Analysis ◽  
Hydrated Cement ◽  
Chemical Affinity ◽  
Complex Additive ◽  
Chemical Studies ◽  
Cement Strength ◽  
Physical And Chemical ◽  
Modifying Additive

The paper presents the results of physical and chemical studies of hardening products in the cement-complex additive-water system. The choice of the modifying additive is based on the structural and chemical affinity of the additive fragments with cement, which includes highly dispersed Tarkosil Ts-38 microsilica and MT-600 peat additive. The synergistic effect of the complex additive leads to a significant improvement in the performance characteristics of hydrated cement: strength, frost resistance, water resistance, and others. Physicochemical analysis shows that the introduction of the complex additive increases the density of hydrated cement due to the formation of low-basic hydrated silicates and their kinds, such as afwillite, foshagite, and truscottite.

Physical-Chemical Studies of the Process of Condensation of a Clinker-Free Binder

2022 ◽  
Vol 906 ◽  
pp. 47-52
Author(s):  
Maria Badalyan ◽  
Amalya Karapetyan ◽  
Hovsep Hoveyan
Keyword(s):  
Portland Cement ◽  
Calcium Hydroxide ◽  
Water Resistance ◽  
Volcanic Rocks ◽  
Mineralogical Composition ◽  
Free Lime ◽  
Hardening Process ◽  
Chemical Studies ◽  
The Difference ◽  
Physical And Chemical

The possibility of using a clinker-free binder as an alternative to expensive and energy-intensive Portland cement is being considered. The pozzolanizing effect of volcanic rocks is presented, where along with the binding of calcium hydroxide by silica to hydrosilicates, the binding of calcium hydroxide by “free” alumina to hydroaluminates also takes place. In the process of hardening of the clinker-free binder, the phase mineralogical composition of the formed new formations differs from the new formations that are synthesized during hardening of traditional Portland cement, which explains the difference in their properties. The new formations that are formed during the hardening process of clinker-free cements are mainly low-basic hydrosilicates, and alkaline aluminosilicates give the cast-in-place stone water resistance, frost resistance, waterproofing, etc., in a word, durability. Physical and chemical studies of the hardening process of clinker-free lime-igneous cements have been carried out, which indicates the possibility of replacing the energy-intensive Portland cement with cheaper clinker-free cement.

scholarly journals Physical and Chemical Studies on Ceruloplasmin

1965 ◽  
Vol 240 (5) ◽  
pp. 1974-1978 ◽  
Author(s):  
Philip Aisen ◽  
Anatol G. Morell
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

scholarly journals Physical and Chemical Studies of a Limited Reaction of Iodine with Proteins

1959 ◽  
Vol 234 (6) ◽  
pp. 1447-1451
Author(s):  
Leon W. Cunningham ◽  
B. Joanne Nuenke
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

scholarly journals Physical and Chemical Studies on Ceruloplasmin

1969 ◽  
Vol 244 (13) ◽  
pp. 3494-3496 ◽  
Author(s):  
A G Morell ◽  
C J A Van Den Hamer ◽  
I H Scheinberg
Keyword(s):  
Chemical Studies ◽  
Physical And Chemical

Hardening Cement Conglomerates by Mining Industries Waste

2021 ◽  
Vol 316 ◽  
pp. 1061-1066
Author(s):  
Lilia V. Ilina ◽  
Irina N. Mukhina ◽  
Mariya M. Semenova
Keyword(s):  
Cement Paste ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Period Increase ◽  
Complex Additive ◽  
Nonlinear Mathematical Models ◽  
Study Results ◽  
Cement Strength ◽  
Heat And Moisture ◽  
Mineral Additives

About 3.5 billion tons of mining waste is generated annually in Russia. The task of their utilization is urgent in connection with the accumulation of large-tonnage waste of simultaneously mined rocks, enrichment waste and crushing screenings. The problem can be solved by using these wastes as mineral additives to artificial cement-based conglomerates. According to the study results it was found, that the compressive strength of hardened cement paste increased during all hardening periods, when finely dispersed mining wastes were introduced. In the early stages of hardening, limestone had a predominant effect. Introduction of diopside led to the greatest hardening together with the hardening period increase. Linear and nonlinear mathematical models, describing the dependence of cement strength on the type and amount of mineral additives, were constructed. The highest strength values of hardened cement paste, both after hardening under normal conditions for 28 days, and after heat and moisture treatment could be achieved with 7% dispersed diopside. At the same time, the hardening effect (increase in the strength of cement by 35–40%) was retained when 1/3 of the diopside in the complex additive was replaced by dispersed limestone. An increase in the content of limestone in the complex additive composition over 1/3 was impractical.

scholarly journals Physical and chemical parameters impact on eosin spectral determinations

2010 ◽  
Vol 29 (1) ◽  
pp. 51
Author(s):  
Liljana Kola
Keyword(s):  
Fluorescence Intensity ◽  
Water Samples ◽  
Measurement Errors ◽  
Fluorescent Dyes ◽  
Water System ◽  
Chemical Properties ◽  
Photochemical Decomposition ◽  
Large Measurement ◽  
Physical And Chemical ◽  
And Chemical Properties

The fluorescence ability of Eosin enables its using as an artificial tracer in the water system studies. The problem deals with the application of Eosin to trace and determine water movements within the karstic system and under ground waters. The fluorescence intensity of fluorescent dyes in water samples depends on their physical and chemical properties, such as pH, temperature, presence of oxidants, etc. Besides that, the UV radiation may induce photochemical decomposition of Eosin which can cause large measurement errors. This paper presents the taken results studying the influence of these factors on Eosin fluorescence intensity using the concentration and synchron scan methods. The method we have elaborated for this purpose made it possible to optimize procedures we use to analyze water samples for the presence of Eosin and measure its content, even in trace levels by the means of the Perkin Elmer LS 55 Luminescence Spectrometer.

scholarly journals PHYSICAL AND CHEMICAL STUDIES OF OVERROOF ROCKS OF CLAY SHALES OF THE DZHERDANAK DEPOSIT

2021 ◽  
pp. 16-21
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
Chemical Properties ◽  
Mineralogical Composition ◽  
Physical And Chemical Properties ◽  
X Ray ◽  
Clay Shales ◽  
Chemical Studies ◽  
Physical And Chemical ◽  
And Chemical Properties

The purpose of this study is study of the physical and chemical properties of the overburden of the Dzherdanak deposit. The chemical and mineralogical composition of the overburden of the Djerdanak deposit has been studied by the methods of X-ray and thermography, electron microscopy and infrared spectroscopy. The main phases are quartz, kaolinite and muscovite. The study of the fine structure of the rock under an electron microscope showed the homogeneity of the rock with pronounced uniform inclusions, which is preserved even after firing. Changes in the rock after firing at 1050 °C have been determined. The formation of mullite at this temperature has been established.

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