Thermal Behavior of an Intumescent Alkaline Aluminosilicate Composite Material for Fire Protection of Structural Elements

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

“…A synthesis of hydroxysodalite which is formed due to high contents of Nacation in the steam cured fly ash-based cement compositions with SiO 2 /Al 2 O 3 =4 and those after drying correlates well with the data obtained on similar systems with high alkali concentrations and after curing in normal conditions [5,6,[46][47][48] simultaneously with a low-temperature curing such as steam curing or drying, the accepted exposition time is not enough for the zeolite crystallization.…”

“…The alkalis in the alkali-activated aluminosilicate cements participate in all stages of structure formation. In particular, rate and degree of activation of the aluminosilicate component is determined by contents of alkalis [3,31,47]. A quantity of alkalis is to be chosen in view of formation of a required phase composition which determines the required properties.…”

“…A quantity of alkalis is to be chosen in view of formation of a required phase composition which determines the required properties. For example, the anhydrous aluminosilicates appear in small amounts in the systems with high content of alkali (Na 2 O/ Al 2 O 3 = 1.0) at 600°C, whereas in the low-alkali compositions (Na 2 O/Al 2 O 3 = 0.5) the crystallization begins only at 1000°C (Table 4) [47,48]. microstructure of the cement matrix displays a large number of sub-crystal phases (Figure 10).…”

“…The developed alkali-activated aluminosilicate cement-based materials were used for making a wide range of composite materials [13,18,20,23,25,35,36,41,[46][47][48][49][50][51][52][53][54][55] for the use in normal conditions and at high temperatures.…”

Evaluation of Physical Properties of a Metakaolin-Based Alkali-Activated Binder Containing Waste Foam Glass

“…The combination with a binder of low environmental impact that will serve as the matrix hosting the waste can be considered for the design of sustainable composites. In this aspect, alkali-activated materials can be viewed as a favorable choice, since either an industrial by-product (e.g., fly ash, blast furnace slag, red mad and sludge) or metakaolin (MK, processed from kaolin clay by calcination at moderate temperatures 650-800 • C) can be used as the aluminosilicate source [5][6][7], along with an easily produced alkaline activator (concentrated aqueous solution of alkali hydroxide, silicate, carbonate or sulfate) [8]. The alkaline conditions cause the destruction of the Si-O-Si, Si-O-Al and Al-O-Al covalent bonds, bringing the constituent tetrahedra of the raw material to a discrete state.…”