Взаимодействие полиэтиленгликоля с продуктами гидратации цемента и его влияние на свойства бетона

Abstract

RU: Для установления особенностей взаимодействия полиэтиленгликоля с минеральными вяжущими веществами были использованы модельные системы, полученные с использованием гашеной извести и золы–унос. Исследования проводили с использованием рентгенофазового и дифференциально–термического методов. В ходе эксперимента было установлено, что при введении ПЭГ в состав бетонной смеси на ранней стадии твердения наблюдается замедление процесса гидратации, а на поздних стадиях твердения — отмечается связывание портландита в органоминеральные комплексы.

EN: It is impossible to imagine a modern concrete without the use of the latest developments in the field of chemical additives. Supplements are quite effective plasticizing action on the basis of ether polycarboxylates. According to their technical characteristics are superior to existing types of plasticizers. But in addition to the positive and negative factors are present, for example, the high cost. It is known that many modern additives, which are made for concrete mortar and concrete comprise a polyethylene glycol (PEG) [9]. Study of the interaction of polyethyleneglycol with portland cement hydration products (such as portlandite) and establish its influence on the properties of concrete mixtures as well as of hardened concrete. To determine the interactions of polyethylene with mineral binders used model systems were prepared using slaked lime and fly ash. Thus, the introduction of PEG to the concrete mix in the early stages of the hardening process is observed delay hydration, which leads to a decrease in heat dissipation, but in the late stages of curing – noted in portlandite organomineral binding complexes is accompanied by an acceleration process of structure formation and, consequently, increasing the strength of artificial stone. Given the established features of the interaction of PEG with Portland cement hydration products designed concrete mixture should be used for concreting massive structures [11].