scholarly journals Effect investigation of the dispersion and type of fine-ground component, as well as the type of dispersing additives on the properties of low-cement periclase castable and samples from it

2018 ◽  
Vol 118 ◽  
pp. 69-86
Author(s):  
V. V. Primachenko ◽  
L. A. Babkina ◽  
I. V. Khonchik ◽  
L. N. Nikulina ◽  
T. G. Tishina ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
High Alumina ◽  
Technological Parameters ◽  
Grain Composition ◽  
Crushing Strength ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Cold Crushing Strength ◽  
The Impact ◽  
Sintered Periclase

Researches have been carried out, as well as technological parameters have been developed for obtaining of low-cement periclase castable and products from it based on sintered periclase, periclase scrap, high alumina cement and dispersing additives. The possibility of using as cement brand of “VGTS-73” of own production of JSC “URIR named after A. S. Berezhnoy”, as well as cement Gorkal-70 (Poland) is established. The dispersion of fine-ground component of charge (mainly periclase and in a small amount of high alumina cement) and the possibility of using Castament FS-10 + Castament FW-10 (Germany), SioxX-Mag (Norway) and Lithopix P 5 (Germany) are established. Castament FS-10 + FW-10 and SioxX-Mag are more effective in terms of obtaining periclase castable products with better service properties. The temperature of thermal treatment of unburned products (350 оC), the firing temperature of products (~ 1450 оC) and the possible application temperature of fired products (1580 оC and above) are established. The developed low-cement periclase castables and samples from them are characterized, depending on the used dispersing additives, by the following indicators of physicochemical properties: content, wt. %: MgO — 85—86, SiO2 — 2.0—6.0, CaO — 1.5—2.5, Fe2O3 — not more than 2.0; grain composition, mm — 6—0; open porosity of the samples after thermal treatment at temperatures of 350 and 1450 оC is 20.3—23.0 and 18.8—22.8 %, respectively; apparent density of the samples after thermal treatment at temperatures of 350 and 1450 оC is 2.63—2.69 and 2.74—2.86 g/cm3, respectively; cold crushing strength of the samples after thermal treatment at 350, 1450 and 1580 оC — 19—38, 31—65 and 29—72 N/mm2, respectively; refractoriness under a load of 0.2 N/mm2 of the samples after thermal treatment at 1450 оC is 1450—1470 оC. The developed low-cement periclase castables and products from them are recommended for service in the conditions, above all, the impact of basis slags. The manufacture of castables and products from them is mastered at the pilot production of JSC “URIR named after A. S. Berezhnoy”.

scholarly journals The influence of high alumina cement and disperse brown fused corundum ratio on the properties of mullite corundum concrete and samples from it

2017 ◽  
Vol 117 ◽  
pp. 76-83
Author(s):  
V. V. Martynenko ◽  
V. V. Primachenko ◽  
L. А. Babkina ◽  
L. K. Savina ◽  
L. M. Scherbak ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Specific Surface ◽  
Thermal Shock Resistance ◽  
Production Costs ◽  
High Alumina ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Corundum Concrete ◽  
Concrete Mix ◽  
Shock Resistance

The influence researches of high alumina cement brand of “VGTS-73” and disperse brown fused corundum ratio on the properties of mullite corundum concrete brand of “MКBС” have been carried out. As a result of carried out researches the expediency of amount decreasing of the high alumina cement brand of “VGTS-73” with specific surface area of 7000 cm2/g from 20 to 15 % and amount increasing of the disperse brown fused corundum from 10 to 15 % in the composition of mullite corundum concrete brand of “MКBС” has been determined. It promotes to strength increasing of samples from this concrete after thermal treatment at a temperature of 1450 оC by 44 % (from 104 up to 150 N/mm2), refractoriness by 60 оC (from 1660 up to 1720 оC) and thermal shock resistance by 30 % (from 7 up to 9 thermal cycles) at preservation of long working time of the concrete mix, as well as to decreasing of production costs. Manufacturing of the mullite corundum concrete brand of “MКBС” with improved composition was put into production at the PJSC “THE URIR NAMED AFTER A. S. BEREZHNOY”.

scholarly journals The Effect of Fine-Ground Glass on the Hydration Process and Properties of Alumina-Cement-Based Composites

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4633
Author(s):  
Galyna Kotsay ◽  
Irmina Masztakowska
Keyword(s):  
Calcium Aluminate ◽  
Calcium Aluminate Cement ◽  
Ground Glass ◽  
High Alumina ◽  
Cement Pastes ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Mortar Strength ◽  
The Impact ◽  
Aluminate Cement

This paper discusses studies regarding the impact of fine-ground glass additives on the hydration and properties of alumina cement pastes and mortars. Fine-ground glass was added to pastes and mortars instead of high-alumina cement and calcium aluminate cement in quantities of 5% and 10%. The findings are inconclusive as to the impact of glass on the properties of tested alumina cement types. The effect produced via the addition of glass instead of cement depends on the type of alumina cement used. Adding fine-ground glass to high-alumina cement enhances the paste’s density while improving paste and mortar strength. Using the same additive for calcium aluminate cement reduces its density and strength. The addition of glass to high-alumina cement adversely affects its strength at higher temperatures.

scholarly journals STUDY OF THE EFFECT OF PARTICULATE ADDITIVES ON THE SETTING TIME AND MICROSTRUCTURE OF HIGH-ALUMINA CEMENT

2020 ◽  
pp. 30-37
Author(s):  
O. Gavshina ◽  
S. Yashkina ◽  
A. Yashkin ◽  
V. Doroganov ◽  
I. Moreva
Keyword(s):  
Setting Time ◽  
High Alumina ◽  
Grain Composition ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Chemical Phase ◽  
Ceramic Binder ◽  
Similar Chemical ◽  
Initial Setting ◽  
Microscopy Method

the paper is devoted to a full-scale study of corundum modifying dispersed additives (reactive, tabular, dispersing alumina) and artificial ceramic binder, their impact on high-alumina cement microstructure and setting time. Artificial ceramic binders are characterized by similar chemical, phase and grain composition with modifying corundum additives and characterized by the presence of particles less than 100 nm (up to 0.5%). The studied materials are finely dispersed polyfractional systems from 0.1 to 13 μm with a prevailing grading fraction of 2-10 μm. In this case, dispersing and reactive alumina are more coarse. Using the microscopy method it was established that the corundum additives increase packing density of high-alumina cement samples, especially with artificial ceramic binder addition. Studies of dispersed additives effect on the setting time of cement was conducted. It is established that the adding of artificial ceramic binder or dispersing alumina at 0.5% is speeding up the initial setting, but a further increasing of the additive content does not affect this indicator. The maximum reduction of setting time is caused by the introduction of 5% tabular alumina.

scholarly journals Influence of type and amount of a quartz­containing additives on the properties of mullite­corundum concrete and samples from it

2019 ◽  
Vol 119 ◽  
pp. 42-52
Author(s):  
L. K. Savina ◽  
M. I. Ryschenko ◽  
L. A. Babkina ◽  
T. G. Tishina ◽  
L. M. Scherbak
Keyword(s):  
Thermal Treatment ◽  
High Alumina ◽  
Partial Replacement ◽  
Concrete Composition ◽  
Optimum Amount ◽  
Crushing Strength ◽  
Optimal Amount ◽  
Cold Crushing Strength ◽  
Before And After ◽  
Silica Addition

An influence of type and amount of a quartz­containing additive (silica fume and pulverized silica) on the properties of concrete and samples from it before and after thermal treatment was investigated. It has been established that, the partial replacement of expensive high­alumina cement in the concrete with the quartz­containing additive improves a flowability of concrete and provides an increase in the strength of concrete samples. Optimal was the addition of domestic pulverized sili-ca in an amount of 2 wt.  %. The compositions of mullite­corundum and mullite­siliceous mixtures with the pulverized silica addition in the optimal amount and a reduced content of high alumina cement (in comparison with the mullite­corundum concrete manufactured by JSC “URIR named after A. S. Berezhnoy”) have been developed. Concrete samples from mullite­corundum concrete of the developed composition with the pulverized silica addition were characterized by a higher cold crushing strength after 3 days of air hardening and thermal treatment at 110 and 1400  C (87 and 108 N/mm2, respectively) compared with samples from mullite­corundum concrete without the quartz­containing additive (52 and 70 N/mm2). Petrographic studies have established that, the introduction of quartz­containing additives in the optimum amount in the concrete composition contributes to better sintering of concrete. In the presence of quartz­containing additives in the binder mass of concrete samples, crystallization of mullite and calcium hexaaluminate was intensified, as well as anorthite formation. The production of mullite­corundum concrete with the quartz­containing additive (pulverized quartz) has been mastered at JSC “URIR named after A. S. Berezhnoy”.

The conversion of high alumina cement

1975 ◽  
Vol 27 (91) ◽  
pp. 59-77 ◽  
Author(s):  
H. G. Midgley ◽  
Ann Midgley
Keyword(s):  
High Alumina ◽  
Alumina Cement ◽  
High Alumina Cement

Production of high-alumina cement clinker by fusion in an electric furnace

Refractories ◽  
1984 ◽  
Vol 25 (5-6) ◽  
pp. 293-296 ◽  
Author(s):  
I. N. Sorokin ◽  
T. M. Golovina ◽  
D. S. Rutman ◽  
A. D. Popov ◽  
V. M. Ust'yantsev ◽  
...  
Keyword(s):  
Electric Furnace ◽  
Cement Clinker ◽  
High Alumina ◽  
Alumina Cement ◽  
High Alumina Cement

Physical and chemical characteristics of heat resistant materials based on high alumina cement

2021 ◽  
Author(s):  
Dana Koňáková ◽  
Eva Vejmelková ◽  
Vojtěch Pommer ◽  
Martin Keppert ◽  
Anton Trník ◽  
...  
Keyword(s):  
High Alumina ◽  
Chemical Characteristics ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Physical And Chemical Characteristics ◽  
Heat Resistant ◽  
Physical And Chemical

Measurement of high-alumina cement-calcium carbonate reactions using DTA

Clay Minerals ◽  
1984 ◽  
Vol 19 (5) ◽  
pp. 857-864 ◽  
Author(s):  
H. G. Midgley
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
High Alumina ◽  
Curing Time ◽  
Lower Strength ◽  
Alumina Cement ◽  
High Alumina Cement ◽  
Strength Tests ◽  
The Stability

AbstractHydrating high-alumina cement will react with calcium carbonate to form the complex mineral calcium carboaluminate hydrate, 3CaO.Al2O3.CaCO3.12H2O. This mineral is reported to be capable of providing strength in concrete and so may provide an alternative to the minerals normally found in the hydration of high-alumina cement, which may under certain conditions convert to other minerals with a loss in strength. Some doubt has been cast on the stability of calcium carboaluminate hydrate and it has been found that in hydrated high-alumina cement, calcium carboaluminate hydrate decomposes at temperatures in excess of 60°C. Cube compressive strength tests on high-alumina cement and high-alumina cement-calcium carbonate pastes have shown that the latter have a lower strength than pastes made with high-alumina cement alone. When cured at 50°C the high-alumina cement-calcium carbonate pastes show a loss in strength with curing time. Cements made with the high-alumina cement-calcium carbonate mixture always have a lower strength than those made with high-alumina cement alone and so no advantage is gained from their use.

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