Abstract
Article is devoted to the investigation of suitability of low carbon Roman cement for restoration and finishing works. The history of the development of Roman cement as a natural hydraulic binder, which was commonly used to decorate building facades in the 19th and early 20th centuries, is presented. The properties of mortars based on Roman cement make it an excellent product for architectural restoration and conservation, as they are characterized by fast setting, high porosity typical for lime mortars, high resistance to weather conditions, high initial strength. At the same time, due to the high surface activity and increased water demand for cement, with the age of hardening, shrinkage deformations can develop, which leads to the formation of main cracks on the surface of the products. It is shown that the addition of gypsum is an effective regulator of the setting time of Roman cement and contributes to an increase in the strength of the cement paste. Analogs of Roman cement based on multicomponent cement binders modified with plasticizing and air-entraining additives are presented.
Highlights
In accordance with the requirements of the Paris Agreement under the UN Framework Convention on Climate Change (UNFCCC) to regulate measures to reduce carbon dioxide emissions in construction, low-carbon ecocements will become increasingly important [1,2]
As a result of the ecological action of the cement industry in the direction of sustainable development, such low-carbon cements due to the choice of appropriate combinations of components become an alternative to conventional Portland cements [3,4,5]
Of particular note are decorative multi-component alkali activated cements for restoration and finishing works, which are chemically analogous to Roman cement [30]
Summary
In accordance with the requirements of the Paris Agreement under the UN Framework Convention on Climate Change (UNFCCC) to regulate measures to reduce carbon dioxide emissions in construction, low-carbon ecocements will become increasingly important [1,2]. The reaction between silica and alumina occurs only in areas of maximum burning temperatures Reactive phases such as CA, C12A7, formed on the surface of clinker granules without the presence of glass phase, determine the rapid hardening and strength in the early stages, and with age of hardening, the increase in strength occurs due to hydration of the belite phase. Of particular note are decorative multi-component alkali activated cements for restoration and finishing works, which are chemically analogous to Roman cement [30] The task is to study the features of the processes of structure formation and the formation of the properties of Roman cement for its suitability and increasing the operational properties
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