Reactividad puzolánica de arcillas caoliníticasuna revisión

Abstract

Pozzolans have demonstrated to be highly efficient mineral additions in the concrete industry, because they reduce the environmental impact generated by the cement manufacture, improve the physical, chemical and mechanical properties of blends, and reduce costs. Calcined clays have been recognized as very good pozzolans, because they improve the durability and compressive strength of mortars and concretes. However, data reported by different authors show a very high variability that makes its modelling difficult. In the same way, and based on a review of the scientific literature, the relationship between morphologic characteristics, thermal treatments and mineral composition of clays and its pozzolanic reactivity is shown; as well as with the chemical, thermal and mechanical methods for improving that reactivity.

Modification of kaolinite clay using benzyltriethylammonium chloride as a surfactant: Preparation and characterization

“…Results of the textural analysis of surface area, pore volume, and pore size for natural and organo-modified kaolinite clay samples are summarized in Table 2. The surface area of NK was 25.34 m 2 /g and is almost similar to the surface area of kaolinite clay examined by Yanguatin et al [35]. The surface area of NK however decreased after organo-modification in the order of: NK > 0.5 NK (13.11 m 2 /g) > 1.0 NK (9.59 m 2 /g) > 1.5 NK (7.30 m 2 /g) > 2.0 NK (5.90 m 2 /g).…”

Metakaolinite Phosphate Cementitious Matrix: Inorganic Polymer Obtained by Acidic Activation

“…Numerous studies have already been performed explaining the important role of metakaolinite as an additional component in Portland cement, as well as its high contribution in concrete [12,13,14,15,16]. Metakaolinite is obtained through the calcination of kaolinite (Al 2 O 3 ·2SiO 2 ·2H 2 O) at approximately 750 °C, rendering it X-ray amorphous, and thus, more reactive [17,18].…”

The Effect of Soil Mineral Composition on the Compressive Strength of Cement Stabilized Rammed Earth

“…Its structure consists of one tetrahedral layer and one octahedral layer. The hydrogen bond is strong, and crucially, the intra-lamellar spacing is very small; hence, it is extremely difficult to separate the layers, and as a result, kaolinite is relatively stable and water less able to penetrate between the layers; thus, it exhibits relatively little swell on wetting [24,25].…”