High Early Strength Composite Cements
N. M. Zaichenko, Ye. S. Khrystych
Donbas National Academy of Civil Engineering and Architecture
Abstract: The optimization of the composite Portland cement, containing fly ash and thermoactivated kaolin (metakaolin) as mineral additives has been done. It is shown that the early strength (2 days) of the composite binding decreases when the content of the complex mineral additive as a partial replacement of Portland cement increases. It is due to the retarding effect of fly ash on the kinetics of strength growth. On the other hand, the higher content of metakaolin obtained by heating kaolinite at a temperature 750 °C compensates for the retarding effect of fly ash in the complex additive. At the design age of hardening, the optimum content of mineral additives provides high strength of the composite Portland cement, which is due to increased degree of hydration of cement, the formation of low-basic calcium hydrosilicates and stable hydroaluminates (hydroaluminosilicates) of calcium in the composition of hydration products according to the XRD data.
Keywords: composite Portland cement, fly ash, metakaolin, cement paste strength, hydration products.
Pages: 154-160.
Link for citation: Zaichenko, N. M.; Khrystych, Ye. S. High Early Strength Composite Cements. – Text : electronic. – In: Proceeding of the Donbas National Academy of Civil Engineering and Architecture. – 2018. – Issue 2018-4(132) Scientific and technical achievements of students of the construction and architectural industry, volume 1, 2. – Р. 154-160. – URL: https://donnasa.ru/publish_house/journals/vestnik/2018/2018-4(132)_t2/st_07_zaichenko_khrystych_tom_2.pdf (date of access: 15.10.2024). (in Russian)
Issue 2018-4 (132)Journal: Proceeding of the Donbas National Academy of Civil Engineering and Architecture
Publish house: Donbas National Academy of Civil Engineering and Architecture