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Fig: 1 Chemical Properties of Cement, GGBS,FLY ASH Table: 2 Comparative Analysis Of Ggbs And Fly Ash Si.no Title of the project Journals name Author name Year of To improve the workability of concrete, the additional water and super plasticizer (SP) Conplast SP 430 based on sulphonated naphthalene polymers were added to the mix by 15% and 3% by weight of The various combinations of fly ash and GGBS considered are 90% & 10%, 80% & 20%, 70% & 30%. The most widely used specification for fly ash in North America is ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete (AASHTO M 295). Fly ash is always used in combination with Portland cement, typically in the range 80% Pc and 20% fly ash to 60% Pc and 40% fly ash, depending on the application. Specific gravity of GGBS and Fly ash are 2.90 and 2.17 respectively. 7% higher than that of fly ash. Fly ash and GGBS are used as binders in this research work. Fly Ash concrete is resistant to acid and sulphate attacks. GGBS and fly ash are two cement replacements which are grown in popularity. As a by-product of existing industrial processes, GGBS is even more sustainable than many other cement substitutes such as fly ash… The mixes covered a range of w/c ratios (0.35. medium in GGBS and low in fly ash.Al2O3(Aluminum oxide ) present more in fly ash and low in cement, it shows there is a similar chemical properties between the three materials . Dosage varies with the reactivity of the ash and the desired effects on the concrete (Helmuth 1987 and Fly ash is used in about 50% of ready mixed concrete (PCA 2000). The current experimental evaluation scrutinizes the effectiveness of fly ash and GGBS on the improvement of workability, compressive strength and durability performances of SCGC. GGBS is a by-product from blast furnace used to make iron. Assessments of the concrete mixes were based on … endobj
Fly ash and ground granulated blastfurnace slag (GGBS) are regarded as conventional cement constituents in much of the world. Read also: Difference between Clay Bricks vs. GGBS-Fly Ash concrete is slightly higher compared to control mix. The chemical and physical properties of GGBS and Fly Ash … 3.2 GGBS and FLY ASH: The chemical composition of Ground Granulated Blast Furnace Slag and Fly Ash is similar to that of cement clinker. The differences in rheological behaviour between GGBS and Portland cement CEM I may enable a small reduction in water content to achieve an equivalent consistence class. 2 . The main reason for the difference of hydration heats between GGBS binder and fly ash binder is that GGBS shows much higher hydraulic activity than fly ash. From this research the results are much better as compare to that of the convention concrete. GBFS is said to increase durability of concrete due to an increased setting time, which reduces 7% higher than that of fly ash. endobj
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In the production of GGBS, grinding is needed, however, the energy requirement for grinding is only 25% of that of clinker ... difference was seen between the performances of 30% and 50% replacement levels for C25. These results are discussed with reference to pore structure measurements, which show the PFA concrete to have a coarser pore structure than the OPC concrete close to the surface—at depth the situation is reversed. The main reason for the difference of hydration heats between GGBS binder and fly ash binder is that GGBS shows much higher hydraulic activity than fly ash. Embodied CO 2 (ECO 2 Furnace Slag (GGBS), Fly Ash (FA), and Silica Fume (SF) and Meta kaolin (MK). The replacement level of GGBS can be as high as 70% of cement, which is about twice as much of PFA (typically replacement level is 40%). %PDF-1.5
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