Recommendations for quantity of polycarboxylate water-reducing admixtures, for the properties of Portland cement as well as the curing regimes is presented in order to reduce the Portland cement amount, to improve the transfer and design strength and durability of prefabricated structures. On the basis of experimental studies the parameters of low-heat steaming treatment of concrete with a polycarboxylate superplasticizer were stated: the duration of pre-exposure 2,5-3 hours, the rate of temperature rise 7 C/hour, the temperature of isothermal exposure 40-50 C. The results obtained can be used in the production of precast prestressed sub-rail structures as well as other reinforced concrete structures with high performance characteristics at concrete plants with double or single mold turnover per day.

• Low-heat steaming treatment of concrete with polycarboxylate superplasticizers
  • 1. Introduction
  • 2. Methods and Materials of research
  • 3. Results and Discussion
    • 3.1. Determination of the optimal amount of admixtures to increase the early strength of cement matrix
    • 3.2. Effective coefficients of strength of cement matrix
    • 3.3. The modes of heat-curing of concrete with polycarboxylate-based admixture
  • 4. Conclusions

Magazine of Civil Engineering / Санкт-Петербургский политехнический университет Петра Великого. — Санкт-Петербург: СПбПУ, 2020-. — Периодичность: 8 раз в год. — Выходит с 2020 г. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Электрон. журнал. — Текст: электронный

Magazine of Civil Engineering / Санкт-Петербургский политехнический университет Петра Великого. — Санкт-Петербург: СПбПУ, 2020-. № 2 (102), 2021. — 1 файл (15,3 Мб). — Свободный доступ из сети Интернет (чтение, печать, копирование). — Электрон. журнал. — <URL:http://elib.spbstu.ru/dl/2/j21-324.pdf>.