MVGR COLLEGE OF ENGINEERINGCIVIL DEPARTMENT

S.NAVEEN KUMARM-TECH ( STRUCTURES)13331D8714

GEOPLOYMER CONCRETE

Under Guidance of Dr. P.Markandaya Raju Professor

GEOPLOYMER CONCRETE Composition : GGBS

Fly Ash Silica Fume Granite Dust Ferro Crome

Activators : Sodium Hydroxide, Sodium Silicate

GEOPLOYMER CONCRETE To reduce greenhouse gas emissions, efforts are needed to develop environmentally friendly construction materials.

This paper presents the development of fly ash-based geopolymer concrete.

In geopolymer concrete, a by-product material rich in silicon and aluminum, such as low-calcium (ASTM C 618 Class F) fly ash, is chemically activated by a high-alkaline solution to form a paste that binds the loose coarse and fine aggregates, and other unreacted materials in the mixture.

The test results presented in this paper show the effects of various parameters on the properties of geopolymer concrete.

The application of geopolymer concrete and future research needs are also identified.

About Geoploymer cement This article is a development of the

main article Geopolymer. From a terminological point of view, geopolymer cement is a binding system that hardens at room temperature, like regular Portland cement. If a geopolymer compound requires heat setting it may not be called geopolymer cement but rather geopolymer binder.

Geopolymer cement is an innovative material and a real alternative to conventional Portland cement for use in transportation infrastructure, construction and offshore applications. It relies on minimally processed natural materials or industrial byproducts to significantly reduce its carbon footprint, while also being very resistant to many of the durability issues that can plague conventional concretes

Reasons for choosing Geoploymer cement

Geopolymer cement categories The categories comprise: Slag-based geopolymer cement. Rock-based geopolymer cement. Fly ash-based geopolymer cement

› type 1: alkali-activated fly ash geopolymer.› type 2: slag/fly ash-based geopolymer

cement. Ferro-sialate-based geopolymer

cement.

Geopolymer cement Materials

Geopolymer Cement Chemical Ingredients

Geopolymerization It is the process of combining many

small molecules known as oligomers into a covalently bonded network. The geo-chemical syntheses are carried out through oligomers (dimer, trimer, tetramer, pentamer) which are believed to contribute to the formation of the actual structure of the three-dimensional macromolecular framework, either through direct incorporation or through rearrangement via monomeric species

Geopolymers are chains or networks of mineral molecules linked with co-valent bonds. They have following basic characteristics:

a) Nature of the hardened material: X-ray amorphous at ambient and medium temperatures X-ray crystalline at temperatures >500°C

b) Synthesis Routes: alkaline medium (Na, K, Ca) hydroxides and alkali-silicates yielding

poly(silicates) – poly(siloxo) type or poly(silico-aluminates) – poly(sialate) type

acidic medium (Phosphoric acid) yielding poly(phospho-siloxo) and poly(alumino-phospho) types

As an example, one of the geopolymeric precursors, MK-750 (metakaolin) with its alumoxyl group –Si-O-Al=O, reacts in both systems, alkaline and acidic. Same for siloxo-based and organo-siloxo-based geopolymeric species that also react in both alkaline and acidic medium.

Scope The research utilized low calcium (ASTM Class F) fly

ash as the base material for making geopolymer concrete. The fly ash was obtained from only one source, because the main focus of this study was the short-term behavior and the engineering properties of fly ash-based geopolymer concrete.

As far as possible, the technology and the equipment currently used to manufacture OPC concrete were also used to make the geopolymer concrete.

The concrete properties studied included the compressive and indirect tensile strengths, the elastic constants, the stress-strain relationship in compression, and the workability of fresh concrete.

Prepartion of Mixes Trail Mix -1 ( 1: 3) GGBS – 625gm Fly Ash – 375gm Silica Fume – 250gm Sand – 3750gm Alkaline Activators Sodium hydroxide ( 10M) Sodium Silicate ( 30%) Water ( 0.4) 500gm Results - 3days – 11.6 mpa

- 7days - 11.8mpsa

Prepartion of Mixes Trail Mix -2 ( 1: 4) GGBS – 625gm Fly Ash – 375gm Silica Fume – 250gm Sand – 5000gm Alkaline Activators Sodium hydroxide ( 10M) Sodium Silicate ( 50%) Water ( 0.4) 500gm Results - 3days – 18.7 mpa

- 7days - yet to be done

Finalizing the Mix proportion Calculation of Design mix for M30

grade concrete by geopolymer materials

Geopolymer concrete is order of the day

The research on geopolymer reinforced concrete started recently as compared to geopolymer plain concrete.

Aim is to find alkaline reactivity to reinforced bars.

Concrete indegradients Cement perpartion – GGBS,Fly Ash,

Silica Fume, Activators Naoh, Na2sio3 Fine aggregate- Quary Dust. Coarse Aggregate – Ferro Crome stone

( slag stone). Cubes casted for only Cement results. Highlighted point for this geopolymer

concrete curing work is carried out by ambient curing

Work to be done Concrete cubes to casted for Trial mixs

once finalizing the Design mix Cubes, prisms, cylinders to be casted. As per the results obtained 1.5 mts Beams

will casted 1 beam – Normal conventional reinforced

concrete 1 beam – Geopolymer reinforced concrete 1 beam – Geopolymer coated reinforced

concrete

Project Outcomes Compressive Strength of concrete Split Tensile strength of Concrete Flexural Strength of Concrete Rapid Chloride penetration in Concrete As Compared to normal concretes Strength comparison between normal concrete and

Geoploymer concrete. Alkaline affect in reinforced bars. Strength variation between coated bars and uncoated bars. Strength comparison between normal concrete and

Geoploymer concrete. Alkaline affect in reinforced bars. Strength variation between coated bars and uncoated bars.

Conclusions Higher concentrations of G.G.B.S (Slag) result in

higher compressive strength of geopolymer concrete.

There is no necessity of exposing geopolymer concrete to higher temperature to attain maximum strength if minimum 10% of fly ash is replaced by GGBS.

Compressive strength of geopolymer concrete increases with increase in percentage of replacement of flyash with GGBS.

Initial setting time is increasing by adding activators in high dosage.

Compressive strength increasing in morality NAOH

To Complete project schedule

Trial Mix – 7days Cubes and Documentation - 10days Paper and Beam Casting – 28days Total days left to complete – 35 days

Thank u

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