Strength and Porosity of Materials on the Basis of Blast Furnace Slag Activated by Liquid Sodium Silicate

Bílek, Vlastimil; Pařízek, Ladislav; Kosár, Petr; Kratochvíl, Jiří; Kalina, Lukáš

doi:10.4028/www.scientific.net/msf.851.45

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…At the same time, a possibility of solving the problem of high AASC shrinkage by the use of Na 2 SO 4 salt electrolyte was shown in [16]. It is also known from [17] on the use (in AASC) of admixtures of cement bypass dust whose characteristic components are CaO, salts of alkali and alkaline-earth metals (KCl, NaCl, K 2 SO 4 , Na 2 SO 4 , CaSO 4 , K 2 CO 3 , Na 2 CO 3 , etc.). Provisions of general mineralogy and cement chemistry provide explanation of the ability of mineral compounds to affect structure formation in cement systems.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The presented studies [14][15][16][17][18][19][20][21][22][23][24][25] show positive influence of mineral and organic admixtures on reduction of AAC shrinkage, however there is no explanation of the mechanism of their structure formation. This fact limits understanding ways of regulating proper deformations in artificial stone.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Development of solutions concerning regulation of proper deformations in alkali-activated cements

Kryvenko

Gots

Petropavlovskyi

et al. 2019

EEJET

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Проаналiзовано сутнiсть проблеми власних деформацiй лужних цементiв (ЛЦ), ускладнення якої пов'язано з пiдвищеним вмiстом гелеподiбних гiдратних новоутворень. Як приклади розглянуто типи цементiв дiаметрально протилежнi за композицiйною будовою i вiдповiдно за вмiстом гелеподiбних фаз при гiдратацiї-лужний портландцемент (ЛПЦ) i шлаколужний цемент (ШЛЦ). Запропоновано пiдходи до формування ефективної структури штучного каменя, протидiючою деформацiям усадки, шляхом втручання в структуроутворення при використаннi комплексiв мiнеральних i органiчних сполук. Такi сполуки в складi комплексних органо-мiнеральних добавок сумiсно впливають на iнтенсифiкацiю кристалiзацiйних процесiв, формування ефективної порової структури та морфологiю гiдратних фаз при зменшеннi вмiсту води в штучному каменi. В якостi iнгредiєнтiв запропонованих комплексних добавок-модифiкаторiв розглянуто солi-електролiти рiзного анiонного типу та анiоноактивнi поверхнево-активнi речовини. Виявлено, що для модифiкацiї ЛПЦ найбiльш ефективною є система «сiль-електролiт-поверхнево-активна речовина». Показано, що модифiкацiя ЛПЦ комплексною добавкою цiєї системи на основi NaNO 3 забезпечує зменшення усадки з 0,406 до 0,017 мм/м. Натомiсть використання Na 2 SO 4 забезпечує цьому типу лужного цементу здатнiсть до розширення в межах 0,062 мм/м. Показано, що ефект компенсованої усадки модифiкованого ЛПЦ пов'язаний з бiльшою кристалiзацiєю низькоосновних гiдросилiкатiв (CSH(В)) i гiдроалюмiнатiв кальцiю (CaO•Al 2 O 3 •10H 2 O). Додатковий ефект пов'язаний з утворенням сульфатвмiщуючого натрiєво-кальцiєвого гiдроалюмiнату (для системи на основi Na 2 SO 4) та кристалiчного гiдронiтроалюмiнату кальцiю (для системи на основi NaNO 3) з вiдповiдним напруженням мiкроструктури. В розвиток для модифiкацiї ШЛЦ запропоновано комплексну добавку системи «портландцементний клiнкер-сiль-електролiт-поверхнево-активна речовина», яка забезпечує зменшення усадки з 0,984 мм/м до 0,683 мм/м. Мiнiмiзацiя усадки модифiкованого ШЛЦ пояснено формуванням поряд з низькоосновними гiдросилiкатами кальцiю гiдроалюмосилiкату натрiю типу гмелiнiту ((Na 2 Сa)•Al 2 •Si 4 •O 12 •6H 2 O) з пiдвищеним ступенем закристалiзованостi. При цьому вiдмiчено, що структура цементного каменя характеризується пiдвищеною щiльнiстю, однорiднiстю i монолiтнiстю гiдратних новоутворень Ключовi слова: лужний цемент, сiль-електролiт, комплексна органо-мiнеральна добавка, структуроутворення, власнi деформацiї, усадка

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Kryvenko

Gots

Petropavlovskyi

et al. 2019

EEJET

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“…Besides the studied coatings based on C-S-H (I) with concentration PVAD 13-30% have coefficient of water resistance 0.85-0.99 differing from the compared analogues. Hence, the principle differences in properties may be linked with the role of mineral components of a compound, whereby active physical-chemical processes probably occur in the system containing CSH of submicrocrystalline structure, and facilitating the synthesis of strength [13][14][15]. According to thermographic readings for samples, the interaction in the system is accompanied with the appearance of a complex polymer silicate phase "X" which can be assessed owing to the presence of a double exothermal effect at maximum of 325 and 420 °C, with the absence on curves, of the initial components.…”

Section: Resultsmentioning

confidence: 99%

System "dispersed polyvinyl acetate-calcium silicate" in furnishing materials

Petrikova,

Amelina,

Maistrenko

et al. 2023

TIT

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This article focuses on the processes of interaction between calcium silicate hydrates and dispersed polyvinyl acetate in tight films with the aim of developing compounds meant for restoration and finishing works. The basis of this development relies on the concept concerning the determining role of the crystal-chemical factor of the silicate phase in the formation of organic-mineral compounds of increased durability. The characteristics of dispersed calcium silicate hydrates are portrayed. The preparation conditions, accounting for the synthesis of the product of submicrocrystalline structure, conforming with the stoichiometry CaO:SiO2=0.8-2.0 have been determined. The interaction has been studied for compounds achieved by mixing ingredients in a rapid whirling mixer, and subjected to hardening at T=20+2 °C. With the aid of XRD, DTA and Infra-Red Spectrometry methods the formation process of the sophisticated polymer silicate phase in the material was observed for a period of 90 days. The properties of the film were investigated and its high resistance against the influence of external factors was established. On this basis a conclusion concerning the quite high effectiveness of substituting portland cement with dispersed calcium silicate hydrate in polymer cement compounds has been made White colour and other various special properties determine the suitability for repair and finishing works on facades of buildings.

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“…The reducing shrinkage of AASC can be caused by admixtures of Na2SO4 [18] and by-pass cement kiln dust, which typical components are free CaO and salts (KCl, NaCl, K2SO4, Na2SO4, CaSO4, K2CO3, Na2CO3, CaCO3, etc.) [19]. However, the action of these admixtures wasn't studied enough and their application does not provide AASC with low shrinkage.…”

Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

The Influence of Complex Additive on Strength and Proper Deformations of Alkali-Activated Slag Cements

Schroeyers

Petropavlovskyi

Rudenko

et al. 2019

MSF

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The peculiarity of alkali-activated slag cements (further, AASC’s) is increased proper deformations, which can cause increased cracking and reduced durability of structure. The paper is devoted to manage AASC’s proper deformations. The main task was to determine the composition of complex additives (further, CA’s) in system «ordinary portland cement (further, OPC) clinker - mineral compound of different anionic type - surfactant» in presence of sodium metasilicate (further, MS) to affect on hydrated AASC performance while ensuring effective structure of artificial stone by criterion of shrinkage deformations. Comparative analysis of hydrated cement systems "OPC clinker - MS", "OPC clinker - mineral compound - MS" and "OPC clinker - mineral compound - MS - surfactant" showed that the greatest effect on reduction of proper deformations occurs when the mineral compounds relate to electrolytes, i.e. Na2SO4 and NaNO3. Hydrated system is characterized by expansion (+0,062 mm/m) in presence of Na2SO4. Almost no shrinkage is supplied by application of NaNO3 (-0,062 mm/m). The obtained CA’s were tested in AASC. CA in the system “OPC clinker - NaNO3 - surfactant” provides the initial setting 43 min, the end - 65 min with accelerated strength. Investigated AASC can be classified as non-shrinking cement. This phenomena is ensured by increasing density, homogeneity and monolithicity of hydrosilicate formations, as well as due to formation of hydroaluminosilicate structures with different morphology by inclusion of nitrate anions.

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Strength and Porosity of Materials on the Basis of Blast Furnace Slag Activated by Liquid Sodium Silicate

Cited by 7 publications

References 19 publications

Development of solutions concerning regulation of proper deformations in alkali-activated cements

Development of solutions concerning regulation of proper deformations in alkali-activated cements

System "dispersed polyvinyl acetate-calcium silicate" in furnishing materials

The Influence of Complex Additive on Strength and Proper Deformations of Alkali-Activated Slag Cements

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