Sustainable low-carbon binders and concretes

Sanytsky, Myroslav; Kropyvnytska, Тetiana; Fic, Stanislav; Ivashchyshyn, Hanna

doi:10.1051/e3sconf/202016606007

Cited by 26 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cement is one of the essential building materials. More than 4 100 000 tons of cement are produced annually globally [1], and CO 2 emissions during its production are 6.5 % of the global emissions or more than 2.2 gigatons of carbon dioxide per year [2,3]. In the foreseeable future, there are no prerequisites for reducing the need for cement.…”

Section: The Problem and Its Relationship With Scientific And Practical Tasksmentioning

confidence: 99%

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

et al. 2021

View full text Add to dashboard Cite

One of the essential tasks for a sustainable future is to reduce harmful emissions into the atmosphere significantly. Cement production is the world’s largest industrial carbon pollutant, accounting for 8 % of global emissions. More than 2.2 gigatons of carbon dioxide are emitted into the atmosphere every year. Therefore, reducing the energy intensity of products and reducing the number of harmful emissions in cement production is becoming critical. One strategy to reduce cement production emissions is to reduce the most energy-consuming component in cement – clinker. In this case, various activation methods are used for maintaining the same level of cement activity. One of these methods is the impact on the hardening binder with magnetic fields. The paper presented a study of hydration processes of blast-furnace cement activated by a magnetized ferromagnetic additive. The work established that the introduction of pre-magnetized ferromagnetic dust into blast-furnace cement composition has an activating effect on binder hydration. It shows that activation occurs both in the initial and long periods of hardening. The nature of the mutual influence of the components of the hydration system alite-lime-slag in a modified binder was revealed. The investigation determined that the ferromagnetic additive, intensifying the process of slag hardening, increases the proportion of hydrated slag by 1.5-2 times. It was revealed that the formation of the ettringite framework in the modified binder’s gel is completed within one day. It is shown that in the subsequent periods, hydration of aluminates occurs mainly due to the formation of tricalcium aluminate hexahydrate (C3AH6), which excludes destructive processes in the late periods of binder hardening. It has been established that under the action of a ferromagnetic additive, the degree of crystallization of hydro silicates in the modified binder increases.

show abstract

Section: The Problem and Its Relationship With Scientific And Practical Tasksmentioning

confidence: 99%

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Cements, which contain inorganic additives, fully comply modern tendencies for sustainable development of mankind [3]. The ecological benefits of such cements are caused by reduction of CO 2 emission due to substitution of portland cement clinker by inorganic additives [4]. At that, materials based on the mentioned cements are characterized by high quality, functionality and durability.…”

Section: Introductionmentioning

confidence: 99%

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

et al. 2021

View full text Add to dashboard Cite

Concretes mixed with seawater are characterised by enhanced performances, but action of chlorides and sulfates ensures the risk of reinforcement corrosion. Application of high consistency fresh concretes ensures changes in hardened concrete structure that causes the problem of steel reinforcement passive state ensuring. Thus mixing of plasticized concretes by seawater actualizes the search for means of steel corrosion prevention. Alkali-activated slag cements (further, AASC’s) reduce effect of ions Cl− and SO42− on steel reinforcement in concrete due to their exchange for ions OH− in the structure of zeolite-like alkaline hydroaluminosilicates. Complex additive «portland cement - calcium aluminate cement - clinoptilolite» was proposed to enhance the protective properties of AASC concretes to steel reinforcement. The results of DTA, X-ray diffraction, electron microscopy, microprobe analysis show that complex additive ensures to prevent steel reinforcement corrosion in AASC concrete mixed with seawater due to binding Cl− and SO42− ions in Kuzel’s salt in AASC hydration products and exchange of these aggressive ions with OH− ions in the structure of clinoptilolite. This effect of complex additive confirmed by surface state and the absence of mass loss of steel rebars embedded in plasticized AASC fine concrete mixed with seawater after 90 d of hardening.

show abstract

“…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].…”

Section: Introductionmentioning

confidence: 99%

Suitability of modified low carbon Roman cements for architectural restoration

et al. 2021

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Sustainable low-carbon binders and concretes

Cited by 26 publications

References 19 publications

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

Suitability of modified low carbon Roman cements for architectural restoration

Contact Info

Product

Resources

About