Features of sulfate and carbonate activation of plasticized fly-ash cement binder systems
DOI:
https://doi.org/10.32347/tit.2024.7.2.01.01Keywords:
fly-ash, sulfate activation, carbonate activation, modification, bindersAbstract
Abstract. The article is devoted to the study of the features of sulfate and carbonate activation of plasticized fly ash-cement binder systems
In the course of research, the principles of composite build of plasticized ash-filled binding compositions containing 20-40% of OPC and coal by-product by increased operational characteristics have been proven. It is shown that the use of complex organo-mineral additives in fly ash-cement compositions, which contain a mixture of carbonate and sulfate compounds as a mineral component, and a plasticizing additive of the polycarboxylate type as an organic component, makes it possible to obtain an artificial stone that is not inferior in its properties to a stone obtained on the basis of additive-free cement type I.
The peculiarities of the synthesis of the strength of artificial stone based on fly ash-cement compositions modified with an organo-mineral additive containing carbonate and sulfate mineral components were studied. It is shown that when only carbonate additives are used for modification, the formation of low-base calcium hydrosilicates takes place on its surface, and when sulfate and carbonate additives are simultaneously introduced, solid solutions based on ettringite and its carbonate analogue prevail among neoplasms.
It has been confirmed that during the hydration of fly ash-cement binding systems activated by the addition of burnt gypsum stone, the greatest effect associated with the increase in strength at all stages of hardening is achieved when the additive is used in the amount of 10%. Modification of sand-cement compositions with a sulfate additive causes an increase in the strength of artificial stone at the age of: 2 days by 14.24; 25.0 and 35.47%; 7 days at 83.18; 43.6 and 40.6%; 28 days for 75.5; 41.6 and 31.5%, respectively, when used in the binder composition of cement 20; 30 and 40%.
Modification of fly ash-cement compositions with a carbonate component causes an increase in the strength of artificial stone at the age of: 2 days by 18.6-20%; 7 days by 105.12-45.3%; 28 days by 86.6-30.0%, respectively. With a consumption of 40% OPC, the optimal amount of carbonate additive is 9% and causes an increase in the strength of artificial stone at the age of: 2 days by 33.3%; 7 days by 56.63%; 28 days for 43.5%.
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