Frontiers | The Effect of Blast Furnace Slag/Fly Ash Ratio ...

The aim of this study was to determine the effects of partial fly ash substitution in to a series of alkali-activated concrete based on a high-MgO blast furnace slag BFS. Mixes were activated with various amounts of sodium silicate at alkali modulus (mass ratio SiO2/Na2O) values of 1.0, 0.5, and 0.25. The results showed that, an increase in the fly ash content extended the initial setting time ...

Slag or Flyash – What's the difference? – BGC Cement

LH is comprised of approximately 35% GP cement and 65% slag. This blend is ideal for use in mass concrete structures where rate of temperature rise and maximum temperature achieved is controlled to reduce the risk of thermal cracking. LH cement meets the requirements of AS3972 for classification as a Sulphate Resisting (Type SR) cement. Another ...

Optimal Design of the Cement, Fly Ash, and Slag Mixture in ...

In addition, in Table 6, Mix1 with 30 MPa and Mix2 with 40 MPa both have the same cement and water content, but the slag content of Mix2 is much higher than that of Mix1. The binder in concrete consists of cement, fly ash, and slag. As Mix2 has a higher binder content, the water–to–binder ratio of Mix2 is lower than that of Mix1.

Effect of water-to-binder ratio, air content, and type of ...

A single was obtained of each of ASTM C150 batch 2012) Type I ordinary portland cement, (ASTM C618 2012) Class F fly ash, ASTM C618 ( 2012) Class C fly ash and ASTM C989 ((2012) Grade 120 slag cement. The chemical composition of the cementitious materials is presented in Table 1. Table 1.

Contributions of fly ash and ground granulated blast ...

Hydration heat evolutions and non-evaporable water contents of binders and reaction degrees of fly ash and ground granulated blast-furnace slag (GGBS) were tested to investigate the contributions of fly ash and GGBS to the early hydration heat of composite binders at 25°C and 50°C.

Fly Ash

water content) because of the plasticity provided by fly ash spheres. Segregation and bleeding are reduced because of the increased cohesiveness of fly ash concrete, so form finish and sharpness of detail are enhanced. And coarse, clean sands can be used in concretes utilizing fly ash and still have good workability.

The Risks of Low-Cement Concrete| Concrete Construction ...

Slag is also strictly a pozzolan and comes in three grades: 80, 100, and 120. Generally, the higher number indicates a higher strength at later ages, all things being equal. Slag is sensitive to the alkali content of the cement (and fly ash) and is sensitive to temperature. So if your cement is a low alkali (Na2O) it will gain strength slower ...

Ground granulated blast-furnace slag - Wikipedia

Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is highly cementitious and high in CSH (calcium silicate hydrates) which is a strength enhancing ...

FLY ASH CONCRETE - WHAT ARE THE REASONS FOR ADDING FLY …

FLY ASH CONCRETE IS BETTER FOR THE ENVIRONMENT. More than 12 million tons of coal fly ash are used in concrete products each year. The use of fly ash, a recovered resource, reduces the depletion of natural resources. It also reduces the energy intensive manufacturing of portland cement.

Blast Furnace Cement - an overview | ScienceDirect Topics

According to Portland blast furnace slag Cement, Portland Pozzolana Cement, and Portland fly-ash Cement (GB1344-1999), the national standard, the content of magnesium oxide in clinker should not exceed 5.0%. If the stability of cement tested by autoclave method is qualified, the content of magnesium oxide can be extended to 6.0%.

Which cement is better, fly ash-based or slag cement? - Quora

Feb 11, 2018· FlyAsh based cement and Slag based cement concrete both have marked a crucial part in concrete industry. Flyash based is used for low grade of concrete up to M40 grade where flyash is replaced up to 25% by weight of cement and Slag based cement is...

water content in slag cement and fly ash

slag and water, the various required chemical components used in (K,Ca)-poly(sialate-siloxo) cement and cured at room temperature. The best compressive strength values for the geopolymeric method were obtained by applying the following conditions: - 10 g K-silicate solution, - 15 g slag, - 5 g water, - 50g to 85 g fly ash.

Fly ash and slag - ScienceDirect

5. Effect of fly ash and granulated blast furnace slag addition on fresh concrete. The advantages and disadvantages associated with the use of fly ash and granulated blast furnace slag are generally known, especially when we consider increased amounts in cement and concrete composition [,,,,,, ].

EFFECT OF ADDITION OF FLYASH AND GGBS ON CEMENT CONCRETE ...

Also, concrete raw materials such as aggregate, cement, fly ash and blast furnace slag have been measured. The radioactivity values of Ra-226, Th-232 and K-40 in fly ash and those of Ra-226 in ...

Properties of sustainable concrete containing fly ash ...

The final mix used 25% fly ash and 25% slag as cement replacement. The cement used was ASTM C 150 Type I portland cement. The fly ash was ASTM C 618 Class F and the blast furnace slag was Grade 120 (ASTM C 989). The chemical analysis and physical properties of the cement, fly ash and slag are presented in Table 1.

(PDF) Optimal Design of the Cement, Fly Ash, and Slag ...

In this study, the densities of water, cement, slag, fly ash, sand, coarse aggregate, and superplasticizer are 1000 kg/m 3, 3150 kg/m 3, 2850 kg/ m 3, 2220 kg/m 3, 2660 kg/m 3, 25 40 kg/m 3, and

Cement | Ozinga

Class F: The burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. This fly ash is pozzolanic in nature. The glassy silica and alumina of Class F fly ash requires a cementing agent, such as Portland cement, quicklime, or hydrated lime, with the presence of water in order to react and produce cementitious ...

Why use Fly Ash and Slag in Concrete? - Bay-Lynx ...

Another difference between slag and fly ash is that while fly ash will rarely surpass 35% of the cement content, slag can substitute 50% of the cement content, or even higher for different applications. This contributes to the large cost savings from slag cement. Applications for Fly and Slag Can Vary

Lean Green and Mean (LGM) Concrete

1 Lean, Green and Mean (LGM) Concrete L.K. Crouch 1, Jason Phillips 1 1 Tennessee Technological University, Box 5015, Cookeville, TN 38505 KEYWORDS: concrete, durability, fly ash, slag, compressive strength, HFVA ABSTRACT Sustainability is currently a factor of extreme importance for the concrete

Fly Ash, Slag, Silica Fume, and Natural Pozzolans, Chapter 3

Fly Ash, Slag, Silica Fume, and Natural Pozzolans Fly ash, ground granulated blast-furnace slag, silica fume, and natural pozzolans, such as calcined shale, calcined clay or metakaolin, are materials that, when used in conjunc-tion with portland or blended cement, contribute to the properties of the hardened concrete through hydraulic or

Fly Ash in Concrete Suppliers & Distributors - CEMEX USA ...

Fly ash suppliers such as CEMEX use it to improve workability of fresh concrete and reduce water demand, shrinkage and permeability of the finished product. Mineral Resource Technologies (MRT), a CEMEX company, is one of the leading fly ash suppliers in the U.S. of fly ash and other coal combustion products (CCPs) including bottom ash ...

Use of Fly Ash and Slag in Concrete: A Best Practice Guide

Use of Fly Ash and Slag in Concrete: A Best Practice Guide proportioning of the concrete mixture such as reducing the W/CM or adding silica fume to produce a ternary blend.

Fly Ash

pre-consumer) This credit is awarded if concrete consists of at least 30% fly ash, slag, or other cement substitute and/or 50% recycled content or reclaimed aggregate by volume, or 90% recycled content or reclaimed aggregate based on the IS0 14021 definition. LEED v4 recognizes fly ash as pre-consumer recycled product.

The Disadvantages of Fly Ash in Concrete | Hunker

Jul 17, 2017· Fly ash is a byproduct from coal-fired power plants that is frequently used as an admixture in concrete to replace a portion of the Portland cement. Using fly ash in concrete is environmentally beneficial because it reduces the Portland cement (a major contributor of CO2) required in concrete.

Water Content In Slag Cement And Fly Ash

Water content in slag cement and fly ash. cementsolidified fly ashes depends more on the kind of fly ash than their contents in fly ash and (5) with ground granulated blast furnace slag addition, the leaching of Cr(VI) from . Online when the range of fly ash and slag content …

Evaluation of the Effect of Fly Ash and Slag on the ...

When 10% of the cement content was replaced by fly ash and slag, there was a critical drop in the strength of the CAM mixture with a UCS value of 0.28 and 0.26 MPa, respectively. This result agrees with the findings from other research about the impact of fly ash and slag on the UCS of cement …

Fly Ash | Cement Australia

Fly ash is a by-product of coal combustion in power stations. Aside from offering environmental advantages by re-using industry waste, adding fly ash also improves the overall performance and quality of concrete. Fly ash affects the plastic properties of concrete by improving workability, reducing water demand, controlling bleeding, and lowering the heat of hydration.

Slag | Cement Australia

Similar to fly ash blends, early age strength development of slag blends is slower than straight cement concrete however strength development from 28 days onwards is equivalent or better. In NSW, Cement Australia markets GGBFS under the brand Ecocem.