can high calcium fly ash concrete be used

can high calcium fly ash concrete be used

Properties of high-calcium and low-calcium fly ash ...

2019-9-1  Micrographs of high-calcium fly ash (HCF) and low-calcium fly ash (LCF). Natural and recycled concrete sand were used as fine aggregates, which were graded following ASTM C33 (2018) (Fig. 2). The density, specific gravity, absorption, and sieve properties of the fine aggregates were determined using ASTM standards.

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7 Utilizing high calcium fly ash in cementless precast ...

2017-9-22  agricultural and industrial waste in Thailand such as fly ash activated by alkaline solution; it is known as green concrete and can be used in precast concrete production and reduces the use of Portland cement. Geopolymer concrete produced from high calcium fly ash, sodium hydroxide

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Pervious high-calcium fly ash geopolymer concrete ...

2012-5-1  However, it was illustrated that the rather coarse high-calcium fly ash geopolymer could be used to produce pervious concrete with acceptable compressive strengths between 5.4 and 11.4 MPa. As shown in Fig. 7, the compressive strength of PGC increased slightly with an increase in the L / A ratio.

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Properties of lightweight high calcium fly ash

2015-9-30  Thus, in this research, high calcium fly ash geopolymer paste was used as a new binder for making lightweight concrete containing used packaging foam as lightweight aggregate.

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Research Article Durability Study on High Calcium Fly Ash ...

2019-7-31  is study presents an investigation into the durability of geopolymer concrete prepared using high calcium y ash along with alkaline activators when exposed to % solution of sulfuric acid and % magnesium sulphate for up to days. e durability was also assessed by

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Properties of metakaolin-high calcium fly ash

2018-2-10  The MK was used as a partial replacement for high calcium fly ash (HCF) in geopolymer binders. The results showed that geopolymer concrete with MK has better strength, porosity, water absorption, and acid resistance. Increasing the use of MK leads to higher strengths in both natural and recycled aggregate geopolymer concrete.

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Novel Analytical Method for Mix Design and

Thus, the proposed method can be used to determine mix designs for high calcium fly ash geopolymer concrete in the range 25-45 MPa at 28 days. In addition, the design equations developed using the statistical regression model provide an insight to predict tensile strength and elastic modulus for a given compressive strength.

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Polymers Free Full-Text Novel Analytical Method for ...

Thus, the proposed method can be used to determine mix designs for high calcium fly ash geopolymer concrete in the range 25–45 MPa at 28 days. In addition, the design equations developed using the statistical regression model provide an insight to predict tensile strength and elastic modulus for a given compressive strength.

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Research Article Durability Study on High Calcium Fly Ash ...

2019-7-31  paste which helps in achieving high strength, low perme-ability, and durable concrete [ ]. Minimising sorptivity is important in order to reduce the ingress of chloride or sulphate into concrete [ ]. e sorptivity of the geopolymer concrete gets increased with the increase in grade. e increase in the y ash content increases the sorptivity [].

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Evaluation of carbonation depth of high calcium fly

High calcium fly ash (FH) is the combustion residue in electric power plants burning lignite or sub- bituminous coal and can be used to produce high performance concrete. For concrete incorporating FH, hydration of Portland cement and reaction of FH will proceed simultaneously.

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Production of Sulfate-Resistant Concrete Containing

1995-6-1  Partial replacement of a moderately sulfate-resistant cement with a high-calcium fly ash may result in either increased or decreased sulfate resistance for concrete. These effects of fly ash have been related to, among other factors, changes in the permeability of concrete and changes in the stability of hydrated calcium aluminates in the ...

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Sulfate resistance of high calcium fly ash concrete -

Sulfate resistance of high calcium fly ash concrete. Sulfate attack is one of the mechanisms which can cause deterioration of concrete. In general, Class C fly ash mixtures are reported to provide poor sulfate resistance. Fly ashes, mainly those belonging to the Class C, were tested as per the ASTM C 1012 procedure to evaluate chemical sulfate ...

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High calcium fly ash geopolymer containing diatomite as ...

2013-9-14  HIGH CALCIUM FLY ASH GEOPOLYMER CONTAINING DIATOMITE 311 oxide18. Many researchers have considered using DE in cementitious binder which is desirable. DE is light in weight due to high porosity19, therefore, the DE can be used in order to reduce the unit weight of the structure, lightweight construction materials in

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Setting Time, Strength, and Bond of High-Calcium Fly

The results indicated that fresh geopolymer concrete had short setting time of 28–58 min due to the presence of high calcium content of fly ash. In general, strengths and modulus of elasticity increased with the increase in NaOH concentration. For compressive strength, the optimum Na 2 O content was around 12% of fly ash. The high-strength ...

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Fresh and Hardened Properties of High Calcium Fly

2019-12-23  Fly ash, either with low calcium (class F) or high calcium (class C) content, is a material rich in silica and alumina, and can be used as a precursor in making geopolymer. The activation of the source material occurs in the presence of a highly alkaline solution, commonly a combination of sodium hydroxide and sodium silicate (Wattimena et al ...

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Practical Uses for High-Volume Fly Ash Concrete

1998-6-1  The high-volume fly ash system has proven to be an economical construction material which can be mixed, placed and consolidated with conventional concrete construction equipment. Some unique properties such as very low heat generation, low cost, and the possibility to use large quantities of fly ash will expand the future use of the high volume ...

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Fly Ash for Concrete: Properties, Uses, Advantages ...

2019-7-20  According to ‘Malhotra V.M. and Ramezanianpour’ (Fly Aash in Concrete, Second Edition), fly ash is one of the residues generated during combustion of pulverized coal in thermal power plant and comprises of the fine particles that rise with the gases. Fly ash mainly contains silica (SiO 2), calcium

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Concrete Admixture Use with High Volume Fly Ash

2017-6-14  concrete. Utilizing High Volume Fly Ash (HVFA) mixes in a project is a way to achieve the needed 40% reduction. ACI 232.2R defines HVFA as concrete containing higher amounts of Fly Ash than normal, usually 50% or greater by mass of cementitious material in a concrete

More

Evaluation of carbonation depth of high calcium fly

High calcium fly ash (FH) is the combustion residue in electric power plants burning lignite or sub- bituminous coal and can be used to produce high performance concrete. For concrete incorporating FH, hydration of Portland cement and reaction of FH will proceed simultaneously.

More

Pervious high-calcium fly ash geopolymer concrete

2014-1-31  Pervious concrete Fly ash Compressive strength Water permeability abstract This study evaluates the properties of pervious concrete made of high-calcium fly ash geopolymer binder. Pervious geopolymer concretes (PGCs) were prepared from lignite fly ash (FA), sodium silicate (NS), sodium hydroxide (NH) solution, and coarse aggregate.

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High calcium fly ash geopolymer containing diatomite as ...

2013-9-14  HIGH CALCIUM FLY ASH GEOPOLYMER CONTAINING DIATOMITE 311 oxide18. Many researchers have considered using DE in cementitious binder which is desirable. DE is light in weight due to high porosity19, therefore, the DE can be used in order to reduce the unit weight of the structure, lightweight construction materials in

More

Sulfate resistance of high calcium fly ash concrete -

Sulfate resistance of high calcium fly ash concrete. Sulfate attack is one of the mechanisms which can cause deterioration of concrete. In general, Class C fly ash mixtures are reported to provide poor sulfate resistance. Fly ashes, mainly those belonging to the Class C, were tested as per the ASTM C 1012 procedure to evaluate chemical sulfate ...

More

Setting Time, Strength, and Bond of High-Calcium Fly

The results indicated that fresh geopolymer concrete had short setting time of 28–58 min due to the presence of high calcium content of fly ash. In general, strengths and modulus of elasticity increased with the increase in NaOH concentration. For compressive strength, the optimum Na 2 O content was around 12% of fly ash. The high-strength ...

More

Fresh and Hardened Properties of High Calcium Fly

2019-12-23  Fly ash, either with low calcium (class F) or high calcium (class C) content, is a material rich in silica and alumina, and can be used as a precursor in making geopolymer. The activation of the source material occurs in the presence of a highly alkaline solution, commonly a combination of sodium hydroxide and sodium silicate (Wattimena et al ...

More

Fly Ash for Concrete: Properties, Uses, Advantages ...

2019-7-20  According to ‘Malhotra V.M. and Ramezanianpour’ (Fly Aash in Concrete, Second Edition), fly ash is one of the residues generated during combustion of pulverized coal in thermal power plant and comprises of the fine particles that rise with the gases. Fly ash mainly contains silica (SiO 2), calcium

More

Practical Uses for High-Volume Fly Ash Concrete

1998-6-1  The high-volume fly ash system has proven to be an economical construction material which can be mixed, placed and consolidated with conventional concrete construction equipment. Some unique properties such as very low heat generation, low cost, and the possibility to use large quantities of fly ash will expand the future use of the high volume ...

More

A Mix Design Procedure for Alkali-Activated High

This research focuses on developing a mix design methodology for alkali-activated high-calcium fly ash concrete (AAHFAC). High-calcium fly ash (FA) from the Mae Moh power plant in northern Thailand was used as a starting material. Sodium hydroxide and sodium silicate were used as alkaline activator solutions (AAS). Many parameters, namely, NaOH concentration, alkaline activator solution-to-fly ...

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Concrete Admixture Use with High Volume Fly Ash

2017-6-14  concrete. Utilizing High Volume Fly Ash (HVFA) mixes in a project is a way to achieve the needed 40% reduction. ACI 232.2R defines HVFA as concrete containing higher amounts of Fly Ash than normal, usually 50% or greater by mass of cementitious material in a concrete

More