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

Freeman, Robert R.; Carrasquillo, R L

doi:10.1016/0958-9465(91)90022-a

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…1 Setting Mechanism of Commercial Cement and Fly Ash Mixture There are several attempts to understand the setting mechanism of y-ash blended cement. [17][18][19][20][21][32][33][34] However, the atomistic understanding of the setting mechanism and strength development is not explored. A huge amount of literature is available on ternary blended concrete.…”

Section: Resultsmentioning

confidence: 99%

“…Zhang et al 35 studied that due to grain size re nement and pore size re nement, the setting time of ternary blended cement was decreased and, both late and early age strength was increased considerably. Freeman and Carasquillo 20 have demonstrated that resistance of Portland cement concrete against sulphate attack was increased by incorporating y ash. Krishnaraj et al 24 demonstrated that an e cient usage of ultra ne y-ash increases the mechanical strength and improves the thermal behaviour of brick masonry.…”

Section: Resultsmentioning

confidence: 99%

“…Wave number (cm − 1 ) Assignment Ref. Although, several reports on the measured compressive strength of cement-y ash mixture are available, 14,20,25,[35][36][37][38][39][40][41][42][43][44][45][46][47] the demonstration on atomistic understanding of strength development is lacking in the literature. As demonstrated earlier, the formation of C-S-H phase provides the strength of cement; and the SiO 2 present in y-ash helps in promoting the formation of this C-S-H phase through decreasing in the formation of CaCO 3 from portlandite (denying the Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the addition of y ash decreases the amount of water requirement for setting of cement, high ultimate strength, improves the workability, reduces bleeding, reduces heat of hydration, reduces permeability, increases resistance to sulphate attack, increases resistance to alkali-silica reactivity, lower costs, reduces shrinkage, increases durability [16][17][18][19][20][21][22][23][24][25][26][27][28]. Hence, it can be said that the use of y ash in the cement will enhance the properties of cement, particularly, in increasing the strength, leading to cement with longer durability and strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fly Ash on Setting Mechanism and Strength of Commercial Cement: A Chemical Approach

Gl¹,

Bn²,

Honnavar³

et al. 2021

Preprint

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The chemistry and mechanism of mechanical strength-development at different setting-times in different weight-ratios of proclaimed commercial-cement and fly-ash mixture is studied. The main content of fly-ash is the quartz (SiO2). According to our results, as the setting time increases, the quartz present in fly-ash gets utilized during setting of the cement to form the well known C-S-H gel (3CaO.2SiO2.3H2O). Our analysis suggests that the addition of fly-ash reduces the water requirement for the hydration-process. Furthermore, the fly-ash inhibits the formation of CaCO3 phase from portlandite (Ca(OH)2) through atmospheric CO2, and more importantly, it promotes the transformation of portlandite to form the C-S-H network which provides strength and long term stability to the set cement. As the commercial cement already contains optimum amount of fly-ash, any further addition of fly ash leaves the fly-ash partially unreacted which drastically decreases the compressive strength.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Fly Ash on Setting Mechanism and Strength of Commercial Cement: A Chemical Approach

Gl¹,

Bn²,

Honnavar³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Partial replacement of industrial wastes such as slag, y ash and silica fume instead of cement is known to be a useful technique to increase the durability of concrete to sulphate attack (Freeman and Carrasquillo 1991;Al-Dulaijan et al 2003). In the study conducted by Onuaguluchi and Eren, copper slag used instead of cement increased the expansion values due to sulphate.…”

Section: Sulphate Resistance Properties Of Cement Based Compositesmentioning

confidence: 99%

Eco-Friendly Basalt Fiber Reinforced Cement Composites (BFRC) Containing Waste Copper As Partial Replacement For Sand And Cement

Aeshah

Kaplan

2021

Preprint

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In this study, the use of copper slag and aggregate together with basalt fiber in cement-based composites was studied. It was aimed to contribute to the ecosystem by using copper waste, which is an environmental problem, in cement-based composites. In addition, the effect of basalt fiber on the strength and durability properties of composites was investigated. Taguchi optimization was carried out for cement-based composites. In this context, Taguchi L18 matrix was used. Copper slag was used at rates of 0, 7.5% and 15%, and copper aggregate at rates of 0, 25% and 50%. Basalt fibers of 6 and 12 mm length were used at the rates of 1%, 2% and 3%. The w/b ratios of the mixtures were chosen as 0.40, 0.50 and 0.60. Durability tests such as permeability, freeze-thaw and sulphate resistance with fresh and hardened mortar properties were performed on 18 different mixtures. In terms of the 7, 28 and 91-day flexural and compressive strength of the mixtures, the use of 1% of 6 mm long fiber in the mixtures with a w/b ratio of 0.40 provided more positive results. In terms of freeze-thaw resistance, it is necessary to use 3% of 6 mm long fiber in mixtures with 0.40 w/b. The use of 7.5% copper slag reduced the water penetration depth. The use of 15% copper slag in mixtures affected by sodium sulphate reduced the expansion values. Since the increase in the ratio of copper aggregate decreased the aggregate volume, it caused the drying shrinkage values to increase. As a result, it was observed that copper slag has a more positive effect than copper aggregate for the strength and durability of composites. However, by using 25% of copper aggregate by sacrificing some features, it can contribute to the environment and ecosystem. The use of basalt fiber with a length of 6 mm and a ratio of 1% increased the mechanical properties, while the use of 3% contributed significantly to the freeze-thaw resistance. It was determined that copper wastes contribute to the environment and ecosystem by using them instead of cement and aggregate.

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Inorganic Binding Materials

Dong

Chen

Yin

et al. 2023

Civil Engineering Materials for Transportation Infrastructure

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

Cited by 11 publications

References 7 publications

Effect of Fly Ash on Setting Mechanism and Strength of Commercial Cement: A Chemical Approach

Effect of Fly Ash on Setting Mechanism and Strength of Commercial Cement: A Chemical Approach

Eco-Friendly Basalt Fiber Reinforced Cement Composites (BFRC) Containing Waste Copper As Partial Replacement For Sand And Cement

Inorganic Binding Materials

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