Genesis of Structure and Properties of the Zeolite-Like Cement Matrices of the System Na(K)-Al₂O₃-SiO₂-H₂O within a Temperature Range of 20–1200°C

Abstract

The chapter deals with a genesis of structure and properties of the zeolite-like cement matrices of the Na(K)-Al2O3-SiO2-H2O system within a temperature range of 20–1200°С. Due to the fact that zeolite-like structures and their characteristics vary within wide ranges, materials with high-performance properties can be obtained through regulation of the structure formation processes. This can be provided by a proper choice of type of an aluminosilicate component, cation of an alkaline component and additives, including Ca-containing ones, and curing conditions. When the cement matrix formation process is appropriately directed, the zeolite-like products (hydrosodalite, analcime, chabasite, faujasite etc.) dominate in the microstructure that is formed. The ability of some zeolites to recrystallize with temperature increase into stable feldspar-like aluminosilicates without destroying the basic skeleton opens a pathway that is worth to explore in the production of materials similar to low temperature ceramics, intumescent coatings, high temperature and corrosion resistant structures, etc. The examples are given on how to use the above cement matrices for making some of the above listed materials.

Intumescent Fireproof Coatings Based on Zeolite‐like Cement Matrices

“…Glukhovsky of the Kyiv National University of Construction and Architecture. The authors established the main regularities of synthesis of zeolite-like phases capable of twostage dehydration with the evolution of free and chemically bound water [24][25][26], they revealed a mechanism of creating porous structures not only in the binder but also in aggregates [27][28][29], determined the durability [30,31], conducted fire tests [32], and confirmed the effectiveness of their development in this area, the fire-resistant materials were produced by JSC Geofip (Ukraine).…”

Design, Characterization, and Incorporation of the Alkaline Aluminosilicate Binder in Temperature-Insulating Composites

“…The excellent performance properties of alkali-activated materials, such as their high strength and heat, corrosion, and freezethaw resistance [4][5][6][7], have been confirmed by over 65 years' experience of their use. The composition of zeolite-like products is determined by structural features of aluminosilicate components (precursor), alongside their composition, the applied curing conditions, the rate of chemical reactions, and the binder design [8][9][10][11][12]. The most appropriate materials for achieving the mentioned goals are natural clays in a dehydrated state, volcanic rocks, and industrial by-products like fuel ashes, slags of various origin, and red mud [9,[13][14][15][16][17][18][19].…”

“…Due to the polymerization of the aluminosilicate constituent, reaction products that are analogs to natural minerals (zeolites and feldspathoids) are formed. Considering their compositional make-up, zeolites may be referred to as inorganic polymers, which, on the one hand, are analogs to organic ones (in terms of such properties as elasticity, corrosion resistance, and adhesion to various materials) and, on the other hand, due to their mineral nature, are ecologically pure and heat-and fire-resistant [9,13]. As the theoretical premise for the creation of alkali-activated materials with a polymeric structure, this study aimed at the synthesis of analogs to natural minerals based on clays of various structural types and applied alkali metal compounds [3,8,26].…”

Design Characterization and Incorporation of the Alkaline Alumino-Silicate Binder in Temperature Insulating Composites

“…As it was later noted, the types of synthesized zeolite-like products are determined by the structural features of the alumino-silicate component (precursor), its composition, the conditions, intensity of chemical reaction, and the mix design of starting compositions [8][9][10][11][12]. The most appropriate for the mentioned goals are natural clays in a dehydrated state, volcanic rocks, industrial by-products like fuel ashes and slags, metallurgical slags, red mud, etc.…”

“…The most appropriate for the mentioned goals are natural clays in a dehydrated state, volcanic rocks, industrial by-products like fuel ashes and slags, metallurgical slags, red mud, etc. [9,[13][14][15][16][17][18][19].…”