Особенности реологических свойств высокопрочных легких бетонов на полых микросферах
| Jazyk: | ruština |
|---|---|
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Вестник МГСУ. |
| ISSN: | 2304-6600 1997-0935 |
| Popis: | Представлены результаты исследования реологических свойств высокопрочных легких бетонов на полых микросферах. Показано, что бетонные смеси, содержащие полые микросферы, обладают повышенной водопотребностью, требуя применения высокоэффективных супери гиперпластификаторов. Установлены зависимости влияния вида, марки и концентрации пластифицирующих добавок на подвижность бетонной смеси, среднюю плотность и прочность бетонов на полных микросферах. Получены бетоны, наполненные полыми алюмосиликатными микросферами, с переделом прочности при сжатии до 70 МПа при средней плотности 1300…1500 кг/м 3. The most important characteristics of any concrete that determine its operational properties are the process conditions of its formation and rheological properties of the concrete mix. The authors present the findings of a study of rheological properties of a high-strength lightweight concrete having hollow microspheres. The authors demonstrate that the concrete mix containing hollow aluminosilicate microspheres have a high water demand; therefore, they need highly efficient superand hyper-plasticizers. The nature of the influence produced by the brand and concentration of plasticizers on the mobility of the concrete mix, as well as on the density and strength of the concrete having hollow aluminosilicate microspheres is identified. Polycarboxylate plasticizers have an additional water content reduction effect. Their application has the highest plasticizing effect and assures moderate mobility of the concrete mix and density of the cement stone. The authors have also identified the regularities in the changes of physical and mechanical properties of high-strength lightweight concretes caused by the mobility of the concrete mix. The authors have proven the feasibility of production of high-strength lightweight concretes having the compressive strength equal to 70 MPa (10,000 psi). Multi-criteria optimization proves that Melflux plasticizers have the best performance based on the cone test (the diameter of the mix spread), and they also have a high density if added to the mixtures under research. Therefore, improvement of the quality of high-strength lightweight concretes and development of high-performance structural concretes having an average density of 1,300...1,500 kg/m 3 (10.8…12.5 lb/gal) require certain technological prerequisites. |
| Databáze: | OpenAIRE |
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