Factors Affecting the Ability of a Fly Ash to Contribute to the Sulfate Resistance of Fly Ash Concrete

1988 ◽  
Vol 136 ◽  
Author(s):  
G. J. McCarthy ◽  
P. J. Tikalsky ◽  
R. L. Carrasquillo ◽  
O. E. Manz ◽  
A. Thedchanamoorthy
Keyword(s):  
Fly Ash ◽  
Calcium Aluminate ◽  
Review Paper ◽  
Sulfate Ion ◽  
Sulfate Ions ◽  
Factors Affecting ◽  
Sulfate Resistance ◽  
Fly Ash Concrete ◽  
Calcium Aluminate Hydrate ◽  
Acidic Type

ABSTRACTThe objective of this summary is to report on work in progress that is examining parameters, measurable through chemical and XRD analyses, that could indicate whether a fly ash will enhance, degrade or have no effect on the sulfate resistance of fly ash concrete.Mehta [1–4] has discussed the factors that contribute to attack of sulfates on fly ash concrete. As noted in his review paper on this subject in the preceding volume in this series [1], the agents responsible for concrete expansion and cracking are alumina-bearing hydrates, such as calcium monosulfoaluminate and calcium aluminate hydrate, that are attacked by the sulfate ion to form ettringite, calcium trisulfoaluminate. Acidic type interactions between sulfate ions and calcium hydroxide also lead to strength and mass loss.

Factors Affecting The Ability Of A Fly Ash To Contribute To The Sulfate Resistance Of Fly Ash Concrete

1988 ◽  
Vol 137 ◽  
Author(s):  
G. J. Mccarthy ◽  
P. J. Tikalsky ◽  
R. L. Carrasquillo ◽  
O. E. Manz ◽  
A. Thedchanamoorthy
Keyword(s):  
Fly Ash ◽  
Factors Affecting ◽  
Work In Progress ◽  
Sulfate Resistance ◽  
Fly Ash Concrete

AbstractThe objective of this summary is to report on work in progress that is examining parameters, measurable through chemical and XRD analyses, that could indicate whether a fly ash will enhance, degrade or have no effect on the sulfate resistance of fly ash concrete.

scholarly journals Deterioration Regularity of Sodium Sulfate Solution Attack on Cemented Coal Gangue-Fly Ash Backfill under Drying-Wetting Cycles

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Shaojie Chen ◽  
Zhen Zhang ◽  
Dawei Yin ◽  
Junbiao Ma
Keyword(s):  
Fly Ash ◽  
Sodium Sulfate ◽  
Sulfate Solution ◽  
Coal Gangue ◽  
Salt Crystallization ◽  
Sodium Sulfate Solution ◽  
Sulfate Ion ◽  
Sulfate Ions ◽  
Ion Contents ◽  
The Masses

To research the properties of cemented coal gangue-fly ash backfill (CGFB) exposed to different concentrations of sodium sulfate solutions under drying-wetting cycles, the mass changes, uniaxial compressive strengths, sulfate ion contents at different depths, and microstructures of CGFB samples were measured in this study. The results show that the CGFB samples were damaged by salt crystallization in the dry state and attacked by the expansive products in the wet state. The sulfate ion contents in CGFB samples increased with the sulfate concentrations and drying-wetting cycles and decreased from the surface to the inside of the samples. The damage process of CGFB samples evolved from the surface to the inside. In the early stage of corrosion, sulfate ions adsorbed to the surface of CGFB samples and consumed nonhydrated particles to form acicular ettringite and other products that filled the material pores. For this stage, the driving force of sulfate ions to enter into the CGFB samples was the highest for the samples immersed in 15% sodium sulfate solution, and the masses and strengths increased the fastest. As the drying-wetting cycles continued, the nonhydrated particles inside the samples were nearly completely hydrated, and the samples were constantly damaged by salt crystallization and dissolution. The corrosion ions entered into the samples and consumed portlandite to produce a large amount of prismatic ettringite and aggravated the internal corrosion of CGFB samples. At the fifteenth drying-wetting cycle, the higher the salt concentration of the immersion solution was, the faster the masses and the strengths of CGFB samples decreased. Moreover, the surface spalling and failure of CGFB samples were more severe.

Exploring the major factors affecting fly-ash concrete carbonation using artificial neural network

2017 ◽  
Vol 31 (S2) ◽  
pp. 969-988 ◽  
Author(s):  
Yasmina Kellouche ◽  
Bakhta Boukhatem ◽  
Mohamed Ghrici ◽  
Arezki Tagnit-Hamou
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Fly Ash ◽  
Factors Affecting ◽  
Fly Ash Concrete ◽  
Concrete Carbonation ◽  
Artificial Neural ◽  
Major Factors

Influence of the method of fly ash incorporation on the sulfate resistance of fly ash concrete

1991 ◽  
Vol 13 (3) ◽  
pp. 209-217 ◽  
Author(s):  
Reed B. Freeman ◽  
Ramon L. Carrasquillo
Keyword(s):  
Fly Ash ◽  
Sulfate Resistance ◽  
Fly Ash Concrete

Research on Sulfate Attack Resistance of Concrete with Sulfate Corrosion-Resistance Admixture

2011 ◽  
Vol 71-78 ◽  
pp. 3562-3565
Author(s):  
Ben Ju Yang ◽  
Qiu Yi Li ◽  
Song Gao ◽  
Tao Li
Keyword(s):  
Corrosion Resistance ◽  
Fly Ash ◽  
Resistance Coefficient ◽  
Sulfate Attack ◽  
Sulfate Resistance ◽  
Fly Ash Concrete ◽  
Slag Powder ◽  
Performance Requirements ◽  
Invention Patent

A concrete sulfate corrosion-resistance admixture is developed with anhydrous calcium sulfo aluminate (C-S-A), super fine slag powder (P800) and anhydrite (CaSO4) in this paper. Scope of prescription is optimized according to performance requirements of JC/T1011-2006. This sulfate corrosion-resistance admixture has declared Chinese national invention patent (201010256189.2)[1]. Corrosion resistance coefficient is tested after sulfate corrosion-resistance admixture is adjoined into fly ash concrete. The results reveal that sulfate resistance of the concrete is obviously improved by addition of sulfate corrosion-resistance admixture, and the its anti sulfate erosion grade is KS150.

FACTORS AFFECTING THE WORKABILITY AND STRENGTH OF ALKALI-ACTIVATED HIGH CALCIUM FLY ASH CONCRETE

2012 ◽  
Vol 11 (8) ◽  
pp. 1425-1432
Author(s):  
Prinya Chindaprasirt ◽  
Krit Chaimoon ◽  
Sittiporn Pantura ◽  
Sahalaph Homwuttiwong ◽  
Athika Wongkvanklom
Keyword(s):  
Fly Ash ◽  
Factors Affecting ◽  
Fly Ash Concrete ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Alkali Activated

Experimental Research on Sulfate Attack Resistance of Steel Fiber Reinforced Fly Ash Concrete

2012 ◽  
Vol 238 ◽  
pp. 51-56
Author(s):  
Lei Cui ◽  
Xiao Dan Ge ◽  
Qin Yong Ma
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Sulfate Attack ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Sulfate Resistance ◽  
Fly Ash Concrete

Sulfate attack is one of the important factors affecting the durability of concrete. An experimental work had been carried out to investigate the behavior of steel fiber reinforced fly ash concrete (SFRFAC) exposed to sulfate attack in comparison with the plain concrete (PC), fly ash concrete (FAC) and steel fiber reinforced concrete (SFRC).The sulfate resistance of the SFRFAC, PC, FAC and SFRC under sodium sulfate attack of different concentrations were evaluated by measuring the compressive strength and flexural strength. The results show that the sulfate resistance of SFRFAC is higher than those of PC, FAC, and SFRC. With the increase of sodium solution concentration, the compressive strength and flexural strength of SFRFAC, PC, FAC and SFRC decrease first, and then increase.

scholarly journals SULFATE ION IN THE GROUNDWATER IN THE BASIN OF MAYMA RIVER (NORTHERN ALTAI, RUSSIA)

2019 ◽  
Vol 16 (33) ◽  
pp. 315-324
Author(s):  
N. A. KOCHEEVA ◽  
V. V. ROLDUGIN ◽  
V. E. KATZ ◽  
T. I. MANANKOVA
Keyword(s):  
Drinking Water ◽  
Anthropogenic Factors ◽  
Qualitative Composition ◽  
Sulfate Ion ◽  
Groundwater Temperature ◽  
Sulfate Ions ◽  
Factors Affecting ◽  
River Waters ◽  
Number Of Factors ◽  
Geological Features

he relevance of the investigated problem is that the majority of the world's population suffers from a lack of drinking water. A significant part of the water on the surface of the Earth is characterized by low quality and is not suitable for home use. That is why it is important to investigate the causes of changes in the qualitative composition of water and find ways to influence it. The aim of the article is to study the content of sulfate ion in the waters of Northern Altai by the example of the Maima river basin. The data was analyzed from two different sources in two laboratories for more accurate results. The study showed that the content of sulfate ions in water is influenced by such factors as precipitation, geological features, landscape features. Different temperature and humidity conditions at different times of the year also affect this indicator. Ice and snow can accumulate sulfate ions created by anthropogenic factors, and, accordingly, during melting, sulfate ions get into groundwater and river waters. The studied indicator is also affected by air temperature and groundwater temperature, the increase of which can be caused by earthquakes. Due to the large number of factors affecting the content of sulfate ion in water, it is rather difficult to determine the exact cause of significant fluctuations. Therefore, the work proves the importance of a comprehensive analysis of factual materials and the study of all of the above factors. Article materials can be useful in further studying the qualitative composition of the waters of the Northern Altai, as well as for their practical application to improve the composition of drinking water.

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