Adaptation of the dynamic mechanical analysis to determine the gel point during the setting of liquid alkali silicates

Abstract

The gel point is one of the relevant parameters for the characterization of materials that undergo a sol-to-gel-transition during their setting. A test method for its determination could be the Dynamic Mechanical Analysis, currently used in the field of polymer science. For the first time this measuring principle has been adapted to the group of liquid alkali silicates, thus verifying the possibility to describe their setting process. Three analytical methods for the determination of the gel point were studied with regard to their applicability and consistency for a compound alkali silicate system used as chemical hardener. K E Y W O R D Sbinders/binding, mechanical properties, sol-gel

Structure–Property Functions of Inorganic Chemical Binders for Refractories

“…The ratio between E II and E I is defined by the loss factor tanδ [ 17 ]. Specifically for the investigations of sol-gel-based binder systems, DMA offers the possibility to determine the gel and the glass point during the setting mechanism [ 18 ].…”

Influence of Aluminium and Boron Orthophosphate on the Setting and the Resulting Structure of Alkali Silicate Binders for Refractory Application

“…The ratio between E II and E I is defined as the loss factor tanδ [14]. The DMA determines those variables by time-dependent measurements and was, thus, determined as a suitable method for tracing the hardening processes of alkali silicates, as has already been shown in preceding work [15].…”

“…In addition, characteristic stages of setting were defined by determining the gel points and the glass points. The gel point was identified as the point in time when the frequency dependence of tanδ disappeared [15]. The glass point was determined as the maximum in the loss modulus E II at a frequency of 1 Hz [16].…”

A Rheological Study of Fibre Reinforced Composites and The Factors That Affect Rheological Behaviour During Impregnation Process: A Review

“…Fig. 4.Research papers on rheological studies of thermoset based-resin using various criterions focusing in the determination of gel point and viscoelastic properties[5,9,13,14,25,30,32,33,40,[42][43][44][45][99][100][101][102][103][104][105][106][107][108] …”