Metakaolin-Based Porous Geopolymer with Aluminium Powder

Abstract

Porous concretes such as aerated and lightweight concretes are commonly used in construction fields. Lightweight construction materials are used to reduce either the weight or the budget of building structures. Porous concrete production is widely utilised aluminium (Al) powder to increase pores in concrete structures and giving information for porous geopolymer production. It was introduced by adding 0.05-1% Al-powder as the initiated materials of geopolymers, to react with water in those materials and promote hydrogen gas inside specimens. The research, therefore, focused on the synthesis of porous geopolymer by metakaolin as a pozzolan and mixed with alkali solution (8M NaOH and Na2SiO3) as well as Al-powder as a foaming agent. The highly porous geopolymers were produced with various Al-powders as 0%, 0.2%, 0.4%, 0.6% 0.8% and 1% by weight. After 7, 14 and 28 days age, the specimens were tested the mechanical properties, such as compressive and flexural strengths. The water absorption, apparent porosity and bulk density were analyzed at 28 days age. The synthesis of metakaolin-based porous geopolymers with Al-powder presented good results. It showed that Al-powder content affected to degree of porosity of geopolymers. Keywords: Metakaolin based geopolymer, Porous geopolymer, Aluminium powder, Foaming agent, Mechanical and physical properties

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

“…On the other hand, the energy requirements for the production of concrete are almost 5% of the global energy consumption. Moreover, the production of 1 ton of cement results in emissions of approximately 1 ton of carbon dioxide (CO 2 ), while aggregate production also poses severe problems to surrounding areas [2,5,6].…”

“…These materials exhibit advanced physico-chemical properties, including good fire and chemical resistance, and can be used in the construction sector [4,7,8]. IPs are synthesized by using various wastes and alkaline solutions [6,7,[9][10][11]. The alkaline solutions, mainly sodium or potassium hydroxide and silicate solutions, act as activators to initiate polymerization of Si and Al present in the raw materials and for the formation of Si-O-Al-O bonds [12].…”

Geopolymer eco-cellular concrete (GECC) based on fluid catalytic cracking catalyst residue (FCC) with addition of recycled aluminium foil powder

“…Specifically, there are several authors focused on GFC production with A addition as the aerating agent: Jay G. Sanjayan et al [15] as well as P. Hlavàcek et al [18] have studied GFC based on alkali-activated fly ashes, R. Arellano Aguilar et al [19] have combined metakaolin and fly ash binder in the geopolymeric mix. Also, the use of metakaolin-based binders was studied by P. Keawpapasson et al [20], and H. Emaisly et al [21] have designed a non-autoclaved high strength cellular concrete from alkali-activated slag. The literature, however, does not show any work focused on GFC made from alkali-activated FCC.…”

Influence of Foaming Agent/Water Ratio and Foam/Geopolymer Paste Ratio to the Properties of Fly Ash-based Lightweight Geopolymer for Brick Application

“…Among the above mentioned waste materials, fly ash get most consideration to be a source materials in manufacturing of geopolymer due to their genially structure and size, also * email: wanmastura@unimap.edu.my or sav@tuiasi.ro they contains high levels of amorphous silica and alumina [9]. Geopolymers are fire-resistant materials and hence, fabricating lightweight geopolymers [10][11][12][13][14][15][16][17] with enhanced thermal resistivity, reduced the density and improved other properties can be considered as an effective way of their usage in brick application [18]. Some attempts have been made to produce lightweight geopolymer using different types of foaming agent such as aluminium (Al) powder [18][19][20], hydrogen peroxide (H 2 O 2 ) [9,21,22], and sodium hypochlorite (NaOCl) [23,24].…”