Geopolymer Concrete Mix Design Efficiencies BY Taguchi Method (original) (raw)

In the world of concrete, where cement is the main constituent, there is a new development named as Geopolymer concrete (GPC). In Geopolymer concrete, the cement is totally replaced by pozzolanic materials like fly ash or ground granulated blast furnace slag. The Geopolymer concrete uses highly alkaline activators to act as binder for the concrete. An experimental investigation has been carried out in order to find the suitable ingredients of the Geopolymer concrete and mix design procedure is proposed to achieve the desired strength at required workability. The fly ash, being waste is disposed and hence poses an environment threat. Also for reducing the cement consumption, effective promotion of Geopolymer concrete is required. And hence, mix design procedure for production of Geopolymer concrete is essential. Therefore, efforts have been made in order to develop a mix design methodology for Geopolymer concrete with the main objective on achieving better compressive strength in an economical way. Fly ash of Class F is used as a binder material for this study, which was brought from local sources. Based on the investigation carried out, sodium hydroxide and sodium silicate are taken as alkaline activator solutions. To achieve the compressive strength in an economical way, correlation between alkaline activator solution molarity and 28 days compressive strength has been investigated for the advancement of conceptual mix design method for Geopolymer concrete. The proposition of mix design includes various molarities of alkaline activator solution ranging from 12 to 16 M and the 28 day compressive strength has been calculated. The proposed design methodology has been given step wise and its verification is given with the help of example in this research. Geopolymer concrete consists of broader range of constituents and therefore for obtaining the best strength of Geopolymer mix, numerous trial mixes are required. In this research, strength criterion mix design is proposed in an economical way, considering all primary constituents and their proportions. The tests for workability, compressive strength and durability are included in this research.

Concrete is till now most fashionable material in construction industries and one of the most environmentally harmful materials. Due to environmental concerns of cement industry, there arises a strong need to make use of alternate technology which is sustainable. Geopolymer is an alternative material which can act as a binder by replacing cement. In this experimental work have analysis the strength and durability properties of fly ash and ground granulated blast furnace slag (GGBS) based geopolymer concrete and also the cost comparison with the normal concrete. The concentration of sodium hydroxide is 13 molarity(M) solutions kept a constant to prepare the mix and alkaline liquid to binder ratio as 0.40, but changing ratio of sodium hydroxide (NaOH)to Sodium silicate (Na2Sio3) 1.50, 2.00 and 2.50. The cube compressive strength was calculated for different alkaline activator solution for different mix Id. i.e. F100G0, F90G10, F80G20, F70G30 and F60G40, (Where F and G are, respectively, Fly Ash and GGBS and the numerical value indicates the percentage of replacement of fly ash by GGBS). The cube specimens are taken of size 100 mm x 100 mm x 100 mm. ambient curing of concrete at room temperature was adopted. In total 45 cubes were cast for different mix Id and the cube specimens are tested for their compressive strength at age of 7 and 28 days respectively. The strength of geopolymer concrete was increased with increase in percentage of GGBS in a mix. It was observed that the mix Id F60G40 gave maximum compressive strength of 66 MPa was observed for ratio of NaOH to Na2Sio3 2.50. Thus the geopolymer concrete have a relatively higher strength and better durability.

Geopolymer concrete is an innovative alkali-activated concrete that has been gaining applications due to its higher strength and excellent durability. In this paper, utilization of ground granulated blast furnace slag (GGBFS) and corncob ash (CCA) is investigated as source materials. The source materials were activated with the solutions of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) for the production of geopolymer concrete (GPC). Sodium hydroxide was prepared in 12 Molar, 14 Molar, and 16 Molar concentrations while grade 30 (M30) concrete was used as mix design proportion. Ground granulated blast furnace slag was substituted by CCA in 20%, 40%, 60%, 80% and 100%, while compressive strength, flexural strength, and split tensile strength were tested and cured in ambient conditions, and compared with Portland cement concrete (PCC). The findings reveal that 14 molar exhibits the best concentration for the activation of GGBFS-CCA based GPC having maximum compressive strength ...

The research aims to determine the best combination of the controlling factors that govern geopolymer concrete’s mechanical and physical properties by utilizing industrial waste. Therefore, a review on the controlling factors was conducted. Firstly, it is to identify the controlling factors, namely chemical composition, alkali activation solution, water content, and curing condition. Secondly, understanding the relationship between these controlling factors and the properties of geopolymer concrete. These factors are analysed to the mix proportion components. Finally, a new proportion method is proposed based on combining ACI 211 standard and recommended molar ratios of oxides involved in geopolymer synthesis. The effect of aggregate has been taken into account by applying the absolute volume method in mix design. Based on the results of the study, it is expected to determine the optimal mix proportions based on multi-responses.

The world is rapidly changing, and building construction is becoming increasingly important. If we look at it closely, the use of concrete increases, resulting in a scarcity of natural resources. To save our natural resources, replace some of the concrete proportions with the following methods. Using equal quantities of fly ash and metakaolin, fly ash and GGBS as admixtures in geopolymer concrete (50-50%). The results of the compressive strength split tensile strength, for 28, 56 and day strength tests. The combination of two admixtures and a super plasticizer allowed the strength parameters to be increased.

The concentration of greenhouse gases in the atmosphere has increased quickly as a result of anthropogenic activities that cause global warming. To solve this issue, Portland cement-free geopolymer concrete is created by using ground granulated blast furnace slag (GGBS) as the primary binder and micronized biomass silica (MBS) in varying proportions in composition of GGBS. The outcomes of this experimental investigation demonstrate the mechanical properties and robustness of geopolymer concrete. In the creation of MBS, rice husk is utilized. Besides from compression, flexural, split tensile strength, and elastic modulus testing, further measurements of water absorption, water sorptivity and rapid chloride permeability test were also carried out. It is found that a geopolymer concrete mix with 10% MBS and 90% GGBS as a binder had the best strength and durability. Also, the compressive strengths of each geopolymer concrete mixture exceeded the required design strength. This experimental investigation shows the possibility of employing MBS as a binder raw material in the production of geopolymer concrete.