ABSTRACT
Resource- and energy-consuming Portland cement is currently considered the most popular material in construction, but its production is classified as harmful due to the large amount of emissions into the environment. Therefore, the development of a clinker-free technology for the production of binders based on mineral fine-dispersed powders of aluminosilicate nature, activated by an alkaline grouting fluid, is an urgent and promising direction.
The research presents the results of a study on the laws of processes occurring during the structure formation of clinker-free binder systems of alkaline activation on alkaline cements using blast furnace granulated slags in a finely dispersed state. Formulations are given and the properties of clinker-free binders of alkaline activation based on mineral finely dispersed powders from rocks of sedimentary and magmatic origin are investigated. Electron probe analysis and X-ray phase analysis revealed the presence of hydrated amorphous compounds close in composition to zeolites in cement stone. An analysis of the results allowed us to determine the optimal composition of clinker-free binder of alkaline activation “silicified marl + volcanic tuff (70: 30%) + Na2SiO3 + NaOH” with activity ranging from 42.0 - 54.5 MPa, depending on the conditions under which the hardening of the samples was implemented.
This work was carried out as part of research on the implementation of scientific project No. 05.607.21.0320. “Development of technology for new building composites on clinkerless alkaline binders using substandard natural and secondary raw materials” that received support from the federal target program “Research and Development in Priority Directions for the Development of the Russian Science and Technology Complex for 2014-2020”. Unique Agreement Identifier RFMTFI60719X0320.
