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

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dc.contributor.authorKrivenko, P.
dc.contributor.authorGots, V.
dc.contributor.authorPetropavlovskyi, O.
dc.contributor.authorRudenko, I.
dc.contributor.authorKonstantynovskyi, O.
dc.contributor.authorKovalchuk, A.
dc.date.accessioned2020-10-29T12:27:33Z
dc.date.available2020-10-29T12:27:33Z
dc.date.issued2019-11
dc.description.abstractThe essence of the problem related to proper deformations in alkali-activated cements (AAC) complicated with high content of gel-like hydrate formations was analyzed. Cement types diametrically opposite in their compositions and, accordingly, in the content of gel phases during hydration, that is, the alkali-acti�- vated portland cement (AAPC) and alkali-activated slag cement (AASC) were taken for consideration. Approaches to formation of an effective structure of artificial stone counteracting shrinkage deformation by means of interference in structure formation when using complexes of mineral and organic compounds were proposed. Such compounds in composition of complex organomineral admixtures jointly influence intensification of crystallization processes and formation of an effective pore structure and morphology of hydrate phases while reducing water content in artificial stone. Salt electrolytes of various anionic types and anion-active surface-active substances were considered as ingredients of the proposed complex modifying admixtures. It has been found that the “salt electrolyte–surfactant” system is the most effective for AAPC modification. It was shown that modification of AAPC with this complex admixture based on NaNO3 reduced shrinkage from 0.406 to 0.017 mm/m. Instead, the use of Na2SO4 provided AAC of this type with a capacity of expansion up to 0.062 mm/m. It was shown that the effect of compensated shrinkage of modified AAPC is associated with a higher crystallization of low-basicity hydrosilicates (CSH(B)) and calcium hydroaluminates (CaO∙Al2O3∙10H2O). An additional effect is associated with formation of sulfate-containing sodium-calcium hydroaluminate (for the Na2SO4-based system) and crystalline calcium hydronitroaluminate (for the NaNO3-based system) with a corresponding microstructure stress. For further development, a complex admixture of “Portland cement clinker–salt electrolyte–surfactant” system was proposed for AASC modification. It provided shrinkage reduction from 0.984 mm/m to 0.683 mm/m. Minimization of the modified AASC shrinkage was explained by formation of sodium hydroalumosilicate of gmelinite type ((Na2Ca)∙Al2∙Si4∙O12∙6H2O) with a high degree of crystallization along with low-basicity calcium hydrosilicates. It was noted that the cement stone structure is characterized by high density, uniformity, and consolidation of hydrate formations.uk_UA
dc.description.sponsorshipThe authors are grateful to the contribution of COST Action CA15202 SARCOS scientific collaboration program: Self-healing as Preventive Repair of Concrete Structures (http://www.cost.eu/COST_Actions/ca/CA15202). The authors also express their gratitude for financial support of this study performed under budgetary financing No. 0118U002017.uk_UA
dc.identifier.citationDevelopment of solutions concerning regulation of proper deformations in alkali-activated cements / P. Krivenko, V. Gots, O. Petropavlovskyi [ atc ] // Eastern-European Journal of Enterprise Technologies. - 2019. - 5/6. - (101). - P. 24 - 32. - Bibliogr. : 27 titl. DOI: 10.15587/1729-4061.2019.181150uk_UA
dc.identifier.issn1729-3774
dc.identifier.issn1729-4061
dc.identifier.urihttps://repositary.knuba.edu.ua/handle/987654321/6098
dc.language.isoenuk_UA
dc.publisherПП «Технологічний Центр»uk_UA
dc.subjectalkali-activated cementuk_UA
dc.subjectsalt electrolyteuk_UA
dc.subjectcomplex organo-mineral admixtureuk_UA
dc.subjectstructure formationuk_UA
dc.subjectproper deformationsuk_UA
dc.subjectshrinkageuk_UA
dc.subjectкафедра технології будівельних конструкцій і виробівuk_UA
dc.subjectлужний цементuk_UA
dc.subjectсiль-електролiтuk_UA
dc.subjectкомп - лексна органо-мiнеральна добавкаuk_UA
dc.subjectструктуроутворенняuk_UA
dc.subjectусадкаuk_UA
dc.subjectдеформацiїuk_UA
dc.subject.udc691.5uk_UA
dc.titleDevelopment of solutions concerning regulation of proper deformations in alkali-activated cementsuk_UA
dc.typeArticleuk_UA

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