Evaluation of the Role of Cetyltrimethylammoniumbromide (CTAB) and Acetylenicglycol (AG) Admixture on Fly Ash Based Geopolymer

Abstract

Alkali activation of fly ash with proper mix design and correct formulations can exhibit very good strength and chemical resistance and other potentially valuable characteristics similar or even better than conventional Portland cement. Utilization of fly ash activated system as binder material in construction industry can limit the consumption of virgin materials required for the production of cement as well less energy intensive process in the manufacturing stage leads to lower greenhouse gas emission. Goeopolymeric products with characteristic properties can be achieved on a laboratory scale level by optimizing the process conditions using selected source material with the addition of admixture. On contrary, Usage of variable source material in a large scale preparation, issues like flow ability, control of setting time are always present that need to be studied. This study was conducted on leaching of fly ash by hybrid activator solution namely sodium silicate, sodium hydroxide, for preparing geopolymer matrix wherein geopolymer (GPC) mortar was made with the addition of organic admixture Cetyltrimethylammonium bromide (CTAB), Acetylenic glycol (AG) as flow ability enhancer with dosage ranging from 0-2% by keeping the Liquid/Solid as 0.45.The Compressive strength of the mortar in the order 30 Mpa was achieved with good flow property by the addition acetylenic glycol and the zeta potential value was found to be similar in the order of control specimen (-15.4mv). Analysis of SEM microstructure of the matrix revealed that binding gel of type Na-S-H are found to be more on AEG added matrix than that of CTAB.

Influence on Rheology and Microstructure of Nanosilica and Modified Polycarboxylate in Water‐Glass‐Activated Fly Ash/Ground Granulated Blast Furnace Slag Geopolymers

“…The influence of Nano‐silica on the FA‐GGBS geopolymer paste was studied briefly in the earlier research work [52] through in‐situ ATR FT‐IR technique. The geopolymerisation process mechanism proposed in earlier works include the alkali ‐OH promoted hydrolysis and then polymerisation of dissolved species coming from both precursors and activators.…”

“…The size effect catalyses the reaction steps as well possible filling effect between the aggregate particles and gel formed which resulted an increase in the density of the microstructure. These effects are pronounced in nano silica, an active ingredient in the fly ash, [52] slag [53] and metakaolin geopolymers. [54] .…”

“…The recent past has seen studies on innovative approach on the application of nanomaterials as an additive in the geopolymeric binders to improve the overall performance.. [50][51] The size effect catalyses the reaction steps as well possible filling effect between the aggregate particles and gel formed which resulted an increase in the density of the microstructure. These effects are pronounced in nano silica, an active ingredient in the fly ash, [52] slag [53] and metakaolin geopolymers.. [54] The accelerating effect of the nano particle on geopolymerisation kinetics mostly depends upon the percentage of addition, methodology of mixing and curing regime. From the earlier reports, it was clear that the optimum dose varies between 2-10 % according to the type of precursors and its dispersing effect in the plasticizer.…”

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

“…QAs have been already used to improve the compressive strength 31) or to obtain nanoporous solids with high surface area 35−38) , to improve the compressive strength of geopolymers 31) or to increase the hydrophobicity of mineral metakaolin particles 39−42) . The interaction between metakaolin and QAs, responsible for an increase in viscosity of fresh geopolymers has already been observed when using cetyltrimethylammonium bromide (CTAB) 43,44) .…”

Effect of Alkali Concentration on Mechanical Properties, Microstructure, Zeta Potential and Electrical Conductivity of Thermally Cured Fly Ash -Blast Furnace Slag Based Blended Geopolymer Composites

“…It is used in formulating optimal solutions of suspensions and emulsions and can also be used to build a long-term stability prediction model 26,27,28 . It has been known to have an effect on the microstructure of geopolymer specimens 29 . Analytical techniques like XRD,SEM and its relationship with hardeed and fresh properties of concrete has already been conducted by the authors as well as other resarchers.…”