Abstract
Twophase introduction of superplasticizer additive influence on the properties of concrete mixture was researched. The obtained results allowed concreting of strengthening for the columns building. Herewith, 40 % of SP additive together with 12 % of mixing water were introduced directly into the concrete mixer truck at the moment of its arrival to the сonstruction site, with subsequent agitation of concrete mixture.
Highlights
The process of concreting monolithic reinforced-concrete structures at the construction site involves the delivery of concrete mixture from the factory by concrete mixer trucks; the quality of erected structures directly depends on preservation, uniformity and workability of concrete mixture during transportation, unloading and placing
Workability is the ability of concrete mixture to take a predetermined shape relatively and fast, while retaining solidity and uniformity of concrete structure; it is determined by its viscosity at the moment of filling of timbering and the degree of plasticity, i.e. plasticity for being deformed without breaking of continuity
The change in rheological properties of concrete mixture is significantly affected by transportation time of concrete mixture, as well as elevated temperature of the environment
Summary
Реализована технология бетонирования железобетонных конструкций с применением самоуплотняющегося бетона. Проведено исследование двухстадийного введения добавки суперпластификатора на свойства бетонной смеси. Обеспечена сохранность реологических свойств самоуплотняющейся бетонной смеси при доставке ее автобетоносмесителями на строительную площадку. Ключевые слова: суперпластификатор, самоуплотняющийся бетон, бетонная смесь, расплыв конуса, автобетоносмеситель. Реалізовано технологію бетонування залізобетонних конструкцій із застосуванням самоущільнюваного бетону. Проведено дослідження двостадійного введення добавки суперпластифікатора на властивості бетонної суміші. Забезпечено збереження реологічних властивостей самоущільнюваної бетонної суміші під час доставки її автобетонозмішувачами на будівельний майданчик. Ключові слова: суперпластифікатор, самоущільнюваний бетон, бетонна суміш, розплив конуса, автобетонозмішувач
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