Durability of fly ash based geopolymer concrete in the presence of silica fume

2017 ◽  
Vol 149 ◽  
pp. 1062-1067 ◽  
Author(s):  
Francis N. Okoye ◽  
Satya Prakash ◽  
Nakshatra B. Singh
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Geopolymer Concrete

scholarly journals Research on Mechanical Performance & Behaviour of Geopolymer Concrete Subjected to Elevated Temperatures

2019 ◽  
Vol 8 (2S8) ◽  
pp. 883-887
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Geopolymer Concrete ◽  
Sem Images ◽  
Before And After ◽  
Alkaline Conditions ◽  
Compressive Strength Of Concrete

The investigative studies on mechanical performance & behaviour, of Geopolymer Concrete (GPC) before and after the exposure to elevated temperatures (of 200 0 C -1000 0 C with an increment of 100 0 C). Indicate that the GPC Specimens Exhibited better Compressive strength at higher temperatures than that of those made by regular OPC Concrete with M30 Grade. The chronological changes in the geopolymeric structure upon exposure to these temperatures and their reflections on the thermal behaviour have also been explored. The SEM images indicate GPC produced by fly ash , metakaolin and silica fume, under alkaline conditions form Mineral binders that are not only non-flammable and but are also non-combustible resins and binders. Further the Observations drawn disclose that the mass and compressive strength of concrete gets reduced with increase in temperatures.

Fresh, strength and microstructure properties of geopolymer concrete incorporating lime and silica fume as replacement of fly ash

2020 ◽  
Vol 32 ◽  
pp. 101780
Author(s):  
Shaswat Kumar Das ◽  
Syed Mohammed Mustakim ◽  
Adeyemi Adesina ◽  
Jyotirmoy Mishra ◽  
Thamer Salman Alomayri ◽  
...  
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Geopolymer Concrete

MECHANICAL AND DURABILITY CHARACTERISTICS OF GGBS DOLOMITE GEOPOLYMER CONCRETE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Aikot Pallikkara Shashikala ◽  
Praveen Nagarajan ◽  
Saranya Parathi
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Setting Time ◽  
Cementitious Materials ◽  
Strength Properties ◽  
Industrial Wastes ◽  
Geopolymer Concrete ◽  
By Products

Production of Portland cement causes global warming due to the emission of greenhouse gases to the environment. The need for reducing the amount of cement is necessary from sustainability point of view. Alkali activated and geopolymeric binders are used as alternative to cement. Industrial by-products such as fly ash, ground granulated blast furnace slag (GGBS), silica fume, rice husk ash etc. are commonly used for the production of geopolymer concrete. This paper focuses on the development of geopolymer concrete from slag (100% GGBS). Effect of different cementitious materials such as lime, fly ash, metakaolin, rice husk ash, silica fume and dolomite on strength properties of slag (GGBS) based geopolymer concrete are also discussed. It is observed that the addition of dolomite (by-products from rock crushing plants) into slag based geopolymer concrete reduces the setting time, enhances durability and improves rapidly the early age strength of geopolymer concrete. Development of geopolymer concrete with industrial by-products is a solution to the disposal of the industrial wastes. The quick setting concrete thus produced can reduce the cost of construction making it sustainable also.

Properties of slag geopolymer concrete modified with fly ash and silica fume

2021 ◽  
Author(s):  
Hafez Elsayed Elyamany ◽  
Abd Elmoaty Mohamed Abd Elmoaty ◽  
Abdul Rahman Ahmed Diab
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Setting Time ◽  
Splitting Tensile Strength ◽  
Geopolymer Concrete ◽  
Initial Setting Time ◽  
Initial Setting ◽  
Additional Water

This research focused on the role of fly ash and silica fume on slag geopolymer concrete through investigating workability (slump, and slump loss), initial setting time, final setting time, and mechanical properties of slag geopolymer concrete, S-GPC, (compressive strength, splitting tensile strength, modulus of elasticity) in addition to SEM (Scanning electron microscope), and X-Ray analysis. The considered variables included, fly ash (FA) content as a replacement of ground granulated blast furnace slag (GS) (0, 10, 20, 30, and 40 %), presence of silica fume (SF) as a replacement of slag, concentration of sodium hydroxide, NaOH, (molarity: 10M, 16M, and 18M), additional water content (7.5,11,14, and 20 %), and curing type (thermal, air, and water curing). S-GPC yielded rapid stiffening and high slump loss with high mechanical properties. The use of silica fume or fly ash or a mix of them enhanced workability, decreased rate of slump loss, and delayed setting time. ACI 318 equation over estimates splitting tensile strength of FS-GPC.

Environmental impact assessment of fly ash and silica fume based geopolymer concrete

2020 ◽  
Vol 254 ◽  
pp. 120147 ◽  
Author(s):  
Rishabh Bajpai ◽  
Kailash Choudhary ◽  
Anshuman Srivastava ◽  
Kuldip Singh Sangwan ◽  
Manpreet Singh
Keyword(s):  
Fly Ash ◽  
Environmental Impact ◽  
Impact Assessment ◽  
Silica Fume ◽  
Environmental Impact Assessment ◽  
Geopolymer Concrete

scholarly journals A STUDY ON SELF-COMPACTING GEOPOLYMER CONCRETE

2021 ◽  
Vol 5 (10) ◽  
Author(s):  
Jini Mol J.S ◽  
Dr. Eswaramoorthi P
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Large Volume ◽  
High Mobility ◽  
Cementitious Material ◽  
Polymer Concrete ◽  
Geopolymer Concrete ◽  
Concrete Mixtures

In this study aims to demonstrate the significance of Self-Compacting Geo-Polymer Concrete (SCGPC) in structures with congested reinforcement. To achieve good compatibility, ordinary geopolymer concrete must be compacted with a lot of vibration. It can be replaced with selfcompacting Geo-Polymer Concrete (SCGPC), which do not require any type of compaction. Under its own weight, it fills every corner of the formwork. A less difference between deformability and stability is needed for the effective production of self-compacting geopolymer concrete. Researchers have developed some guidelines for proportioning self-compacting geopolymer concrete mixtures, which include i) lowering the aggregate-to-cementitious-material ratio. (ii) Raising the volume of the paste and w/c ratio as well as (iii) using different viscosity-enhancing admixtures in order to achieve high mobility in selfcompacting geopolymer concrete, superplasticizers are typically needed. Segregation may be avoided by using a viscosity changing admixture or a large volume of powdered content. Fly ash, GGBFS, Silica Fume, Metakaolin, and slag, among other powdered materials, may be applied.

Sign in / Sign up

Export Citation Format

Share Document