A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali-activation of aluminosilicates. The fundamental chemical and structural characteristics of geopolymers derived from metakaolin, fly ash and slag are explored in terms of the effects of raw material selection on the properties of geopolymer composites. It is shown that the raw materials and processing conditions are critical in determining the setting behavior, workability and chemical and physical properties of geopolymeric products. The structural and chemical characteristics that are common to all geopolymeric materials are presented, as well as those that are determined by the specific interactions occurring in different systems, providing the ability for tailored design of geopolymers to specific applications in terms of both technical and commercial requirements.

Geopolymer technology: the current state of the art

http://www.personal.psu.edu/faculty/g/u/gur/cement%20for%20the%20future.pdf

Alkali-activated fly ashes: A cement for the future

The Role of Inorganic Polymer Technology in the Development of ‘Green Concrete’

Understanding the relationship between geopolymer composition, microstructure and mechanical properties

Carbon dioxide equivalent (CO2-e) emissions: A comparison between geopolymer and OPC cement concrete

Non-destructive measurement techniques are revealing themselves as a very important tool in the different fields or research due to their very own nature. The Materials team of ICCET is developing, since some time ago, the application of one of these techniques —specifically speaking, infrarred thermography— to the follow-up and quantification of the moisture present in the buildings of the Architectural Heritage. At all events, that technique can be applied to any physical phenomenon involving a variation of temperature or emissivity. This paper shows different possible applications of infrared thermography.

/pdf/la-termografia-infrarroja-posibilidades-y-aplicacion-al-3i4oycr6zk.pdf

La termografía infrarroja: posibilidades y aplicación al estudio superficial de los materiales

Trabajo presentado al 15th International Congress on the Chemistry of Cement (ICCC), celebrado en Praga (Republica Checa) del 16 al 20 de septiembre de 2019.

/pdf/new-alkaline-belitic-hybrid-binders-1oqs01idj3.pdf

New alkaline-belitic hybrid binders

Hormigones alcalinos-exentos de cemento portland

Effect of NaOH molarity on the formation of hybrid cements from sulfate-bearing clay and Pietra Serena sludge

The primary object of the present research was to investigate the porous low calcium alkali activated material (AAM). Traditionally Na+ ions for alkali activation solution ensure highly alkaline media which enhances the dissolution of amorphous phase in the raw materials forming solid cementitious material with sodium aluminosilicate hydrate (N-A-S-H) structure afterwards. Almost all alkali ions are partially hydrated filling the pores in the gel structure (N-A-S-H gel, type zeolite precursor) and neutralizing the charge on Al(OH)-4 groups. These alkali ions are available for leaching in water environment. Due to this property the application of porous AAM in this research is related to the water treatment systems similar to those of natural zeolites which are considered as effective sorbent because of their porous structure, high specific surface and ion exchange. Porous AAM was obtained from metakaolin, sodium silicate glass, modified sodium silicate solution with Ms = 1.68 and diethylene glycol (DEG) aluminium paste as pore forming agent. The density of AAM was 1150 ± 12 kg/m3 and compressive strength fc > 12 MPa. The effect of heat treatment to microstructure and structural properties of AAM was investigated. Heat treatment is an effective method for changing the alkali leaching kinetic form AAM structure.DOI: http://dx.doi.org/10.5755/j01.ms.23.3.16280

https://matsc.ktu.lt/index.php/MatSc/article/view/16280/8954

Ángel Palomo

Papers

La termografía infrarroja: posibilidades y aplicación al estudio superficial de los materiales

New alkaline-belitic hybrid binders

Hormigones alcalinos-exentos de cemento portland

Effect of NaOH molarity on the formation of hybrid cements from sulfate-bearing clay and Pietra Serena sludge

The Effect of Heat Treatment on Alkali Activated Materials