Triasa izcelsmes mālu ģeopolimerizācijas iespējas

Šajā darbā tiek apskatītas jauna materiāla - ģeopolimēra - iegūšaas iespējas no Latvijas triasa izcelsmes māliem

Latvijas mālu ģeopolimerizācijas iespējas

Šajā darbā tiek apskatītas dažu Latvijas mālu aktivācijas iespējas ar nolūku iegūt jaunu materiālu - ģeopolimēr

Effect of Curing Conditions on the Properties of Activated Illite-Based Clays

Šajā darbā tiek apskatīta izturēšanas laika un temperatūras ietekme uz aktivētu illīta mālu īpašībā

Latvijas mālu ķīmiskā un termiskā aktivēšana

Šajā darbā tiek apskatīta jauna tipa materiālu ieguve, Latvijas mālus ķīmiski un termiski aktivējot

Comparative Study of Illite Clay and Illite-Based Geopolymer Products

Quaternary (Q-clay) clayey deposits are one of the dominating parts of mineral raw materials of the sedimentary cover at present area of Latvia. These clays can be characterised by illite content up to 75-80 %. Two ways for use of illite clays were studied: conventional and geopolymers method. Purpose of the second mentioned method was showing the influence of alkali (KOH) on the transformation of Q-clay/illite structure. Obtained products were investigated by IR–spectroscopy, DTA and XRD, pore size distribution was determined as well. Some ceramic properties and compressive strength were determined and compared. IR-spectrum showed the effect of alkali on the transformation of Q-clay/illite structure in three main absorption bands: 3620-3415 cm-1 which is related to the vibrational modes of adsorbed water between SiO4 and AlO6 layers; new stronger absorption bands at 1635 cm-1 and 1435 cm-1 indicate on the appearance of vibrations in Q-KOH and are related to the K-O-Si bonds; the most essential changes are vibrations at 779 and 684 cm-1 showing on the disconnection of Si-O-Al bonds and vibrations among SiO4 and AlO6 layers. X-ray diffraction spectra of Q-clay and Q-clay/KOH shows the changes in the intensity of illite peaks. Investigations of the bulk density in dependence on temperature showed the relatively remarkable decrease of bulk density for Q-clay while - the small for Q-clay/KOH. Mentioned values correlate with the compressive strength of Q-clay and Q-KOH products

The Suitability of Chemically and Thermally Activated Quaternary Clays of Latvia as Raw Material for Geopolymer Binders

It is now accepted that new binders are needed to replace Portland cement (PC) for enhanced environmental and durability performance. The urge to reduce emissions of carbon and the fact that PC structures having built a few decades ago are already facing disintegration problems points out the handicaps of PC binders. Research works carried out in developing of alkali-activated binders show that this new type of binder could have a huge potential to become as alternative building material. Latvian Quaternary clays were studied from the point of view of the national economy, analysing the physical properties and chemical composition of those sediments in connection with the possibilities of their utilisation in the manufacture of geopolymer materials. Quaternary clay minerals dominate by illite with admixture of chlorite. Quaternary clay typically is rich in fine, scattered carbonates. The aim of this study was to synthesize geopolymer product from illite clays of Latvia under alkaline activation. Results of the investigations showed the influence of alkalies on the transformation of clay/illite structure by curing of activated clays at different temperatures for various time. Obtained results showed that illite-based clays of Latvia could play a role of the raw material for production of geopolymer binders

The Suitability of Chemically and Thermally Activated Quaternary Clays of Latvia as Raw Material for Geopolymer Binders

The aim of this study was to synthesize geopolymer binders from illite clays of Latvia under alkaline and thermal activation. FTIR spectra and XRD results confirmed the differences among activated clays developing the diverse final compressive strength of the obtained samples