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Hussam Alghamdi

Assistant Professor

Faculty

كلية الهندسة
Department of Civil Engineering, King Saud University, Office: 2A82
المنشورات
مقال فى مجلة
2018

Novel Synthesis of Lightweight Geopolymer Matrices from Fly Ash through Carbonate-based Activation

Alghamdi, Hussam . 2018

This paper describes a novel synthesis route for porous geopolymers based on carbonate-based activation of fly ash as the primary source material.  The aqueous dissolution of sodium carbonate supplies NaOH which provides the alkaline medium for fly ash geopolymerization (along with externally supplied sodium silicate also, if needed). The CO2 released from the low temperature (~100oC) decomposition of carbonates formed as reaction products, acts as the pore-forming agent. The dosage of the alkaline agents is tailored to obtain a porous material with large enough porosity (~50%), and sufficient mechanical strength (~15 MPa) and thermal conductivity (~0.3 W/m-K) so as to be used as structural/insulating elements in buildings. Detailed analysis of microstructure and reaction products reveals the presence of sodium carbonate crystals in the matrix, recrystallized from the initial carbonates added. Determination of CO2-equivalent emissions shows that these matrices, despite releasing some amount of CO2 in the pore-forming process, are more sustainable than similar matrices synthesized from portland cement or geopolymerized using other starting materials and activating agents.

رقم المجلد
17
مجلة/صحيفة
Materials Today Communications
الصفحات
266-277
مزيد من المنشورات
publications

This dissertation aims at developing novel materials and processing routes using alkali activated aluminosilicate binders for porous (lightweight) geopolymer matrices and 3D-printing concrete…

بواسطة Hussam Alghamdi
2019
publications

Synthesis and characterization of 3D-printable foamed fly ash-based geopolymer matrices for thermal insulation is the focus of this paper.

بواسطة Hussam Alghamdi, Narayanan Neithalath
2019
publications

Material design of alkali activated fly ash-based binders for extrusion-based 3D printing, the rheological responses that are influential in ensuring printability, and the properties of such…

بواسطة Hussam Alghamdi, Sooraj A. O. Nair, Narayanan Neithalath
2019