Micro-characterisation of alkali activated paste with fly ash-GGBS-metakaolin binder system with ambient setting characteristics

Kamath, Muralidhar; Prashant, Shreelaxmi; Kumar, Mahesh

doi:10.1016/j.conbuildmat.2021.122323

Cited by 84 publications

(29 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An addition of superplasticizers or extra water can be used to improve workability which may improve the applicability of alkali activated paste to various infrastructure projects [49] Similar result was found in another study [50]. Kamath et al [51] studied on fresh properties of alkali activated ternary paste with fly ash, GGBFS, and metakaolin binders. The slump flow value increased from 135 to 170 mm as the metakaolin percentage in the binder decreased from 20 to 5% due to the high surface area of metakaolin and its irregular form.…”

Section: Mini-slump Flow Of Pastesupporting

confidence: 54%

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Abhishek

Prashant

Kamath

et al. 2021

Innov. Infrastruct. Solut.

Self Cite

View full text Add to dashboard Cite

This paper describes a review of the state-of-the-art research carried on the fresh and hardened properties of Alkali Activated Binders and Concretes. Though, many research have been carried out in the recent times on alkali activated binders, few key parameters still remain unattended, that restricts the commercial application of AAMs to the general construction activities. Fresh properties, mechanical strength and durability performance of Alkali activated concrete with various Alumino silicates as base materials is mentioned. An essential parameter of Alkali activated concrete is the concentration of alkaline solution on which various properties like mechanical strength, setting time and durability depends. Influence of wide range of concentrations from 6 to 16 M on these properties are studied and reported in this paper. This paper mainly concentrates on properties of readily available base materials such as Fly ash and Slag and the means to improve their performance through the use of various industrial and agro-based byproducts as additives. Problems pertaining to practical applicability of AAMs to general construction activities are also highlighted.

show abstract

Section: Mini-slump Flow Of Pastesupporting

confidence: 54%

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Abhishek

Prashant

Kamath

et al. 2021

Innov. Infrastruct. Solut.

Self Cite

View full text Add to dashboard Cite

show abstract

“…[ 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. The chemical composition, mineralogical structure, fineness, and amorphous content of these materials affect the reactivity of the aluminosilicate sources [ 2 , 6 , 10 , 11 ]. Some MTs can be stabilized or solidified through alkaline activation to create a cementitious material through the inorganic polymerization of their compounds, explained as follows.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

et al. 2022

View full text Add to dashboard Cite

Beneficiation of industrial wastes, such as mine tailings (MTs), through development of alternative eco-friendly geopolymer binders for construction composites offers a twofold environmental benefit, as it reduces the demand for cement and it increases the sustainability of industrial processes by creating a value-added product from an industrial byproduct. While MTs have the requisite composition for use as a geopolymer precursor, they are often low-reactive. This study explored the effect of Class C Fly Ash (FAc) on the geopolymerization of low-reactive gold MTs. A 10 M sodium hydroxide (NaOH) solution was used as the alkaline activator with four different concentrations of FAc (5, 10, 15 and 20 wt.%). The results indicated that the combination of FAc with the low-reactive gold MTs improved the physicochemical stability of the final geopolymerized samples, with a 95–120% increase in compressive strength, compared to the geopolymer samples of only low-reactive gold MTs. Although some of the strength improvement could be attributed to geopolymerization of the FAc itself, the presence of the FAc also improved the reactivity of the MTs, increasing the geopolymer production of the MTs. This study documents the positive effects of the FAc on gold MTs with low-calcium content and their conversion into sustainable inorganic composite geopolymers for the construction field.

show abstract

“…For FA2CCR1-0.4-50 °C ( Figure 4 e) and FA1CCR1-0.4-50 °C ( Figure 4 d), both featured one pronounced broad reflection centered at 29° (2θ), in which the angle regions of the reflection center exceeded those of FA ( Figure 4 f). This broad reflection suggests the existence of an amorphous phase, that may correspond to the coexistence of calcium alumina silicate hydrate (C-A-S-H) and calcium silicate hydrate (C-S-H) [ 47 , 48 ]. This result also demonstrated that FA did indeed react with CCR to form a geopolymer network during the mixing with water [ 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

Utilization of Calcium Carbide Residue as Solid Alkali for Preparing Fly Ash-Based Geopolymers: Dependence of Compressive Strength and Microstructure on Calcium Carbide Residue, Water Content and Curing Temperature

Wang

Guo

et al. 2022

Materials

View full text Add to dashboard Cite

Calcium carbide residue (CCR) is a solid waste resulting from acetylene gas production. In this study, CCR was used as an alkali activator to prepare fly ash (FA)-based geopolymers without any alkali supplementation. We studied the factors (FA/CCR ratio, curing temperature, and water/binder ratio) influencing the mechanical property of FA/CCR-based geopolymers. The compressive strength results showed that, by optimizing these three factors, the FA/CCR mixture has great potential for use as a cementitious material and geopolymer with a dense microstructure having a maximal compressive strength of 17.5 MPa. The geopolymers’ chemical structure, microstructure, and chemical composition were characterized and determined by a combination of techniques. All these results revealed that amorphous C-(A)-S-H (calcium (aluminate) silicate hydrate) gels mainly formed after geopolymerization resulting from the reaction of FA and CCR. In addition, some crystallines, such as ettringite and monosulfate, were also formed. Further, geopolymers prepared with a suitable FA/CCR ratio (1:1 or 1:2) possessed a compact microstructure because of their sufficient reactive SiO2 and Al2O3 and high-enough alkalinity, responsible for higher content of C-(A)-S-H formation and better mechanical property. Too high curing temperature or water content induced the formation of a loosely bound geopolymer matrix that strongly weakens its mechanical property.

show abstract

Micro-characterisation of alkali activated paste with fly ash-GGBS-metakaolin binder system with ambient setting characteristics

Cited by 84 publications

References 72 publications

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Effect of the Class C Fly Ash on Low-Reactive Gold Mine Tailing Geopolymers

Utilization of Calcium Carbide Residue as Solid Alkali for Preparing Fly Ash-Based Geopolymers: Dependence of Compressive Strength and Microstructure on Calcium Carbide Residue, Water Content and Curing Temperature

Contact Info

Product

Resources

About