The Use of Fly Ash and Similar Materials in Concrete.

Fulton, A A; Marshall, W T

doi:10.1680/iicep.1956.11525

Cited by 9 publications

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“…processing) before use. Reference to moisture conditions appears to be made, since in this form, handling and transportation of fly ash can become difficult [10,11]. This is important, as wetting and storage of fly ash are often necessary to achieve a balance between production, dry holding capacity and demand [2].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of reinforcement in concrete containing wet-stored fly ash

McCarthy

Tittle

Dhir

2019

Cement and Concrete Composites

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The study described was concerned with moistened fly ash as a cement component in concrete and its influence on carbonation and chloride-induced corrosion. Five laboratory-moistened fly ashes (10% by mass) and samples from two power station stockpiles (moistened at 10 to 30% by mass) were examined, with several material/storage variables investigated. Initial tests quantified moisture effects, which indicate agglomeration of fly ash and a tendency for this to increase with free lime content, storage period and temperature. Concretes were compared at equal slump (75 mm) and 28 day (cube) strength. Air (intrinsic) permeability and water absorption were slightly greater (high free lime, 0.9%), or lower (low free lime < 0.1%) with moistened fly ash in concrete (compared to that with dry material), and where there were benefits, these increased with longer storage. For carbonation and chloride diffusion, moistening of low free lime fly ash gave similar or slightly enhanced results. In the case of high free lime fly ash, wet-storage gave increased chloride diffusion. This seemed to be due to the effects that higher free lime content has on wet fly ash (increased agglomeration, reduced fineness/reactivity) and their influences on the durability process. Carbonation tended to reduce with low storage temperature, while chloride diffusion gave little change. Reinforcement corrosion associated with these was similar between dry and moistened low free lime fly ash concretes. While paste experiments suggest some differences in chemistry between dry and wet-stored fly ash systems and their response to carbon dioxide and chloride exposures, these didn't seem to have a noticeable effect on concrete resistance to the processes.

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Section: Introductionmentioning

confidence: 99%

Corrosion of reinforcement in concrete containing wet-stored fly ash

McCarthy

Tittle

Dhir

2019

Cement and Concrete Composites

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“…McMillan and powers were the first who used coal FA in concrete in 1934 [ 3 ]. After them, based on the research work conducted during the 1950s by Fulton and Marshall [ 4 ], Lednock, Clatworthy and Lubreoch Dams had been constructed in the UK using FA as a partial cementitious material, and since then, these structures have been reported in excellent conditions [ 5 ]. FA or Pulverized-fuel ash ( PFA ) from coal is a pozzolan, which results in low-permeable and more durable concrete, which is able to resist the ingress of deleterious chemicals.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Mineral Admixtures on the Properties of Fresh Concrete

Khan

Nuruddin

Ayub

et al. 2014

The Scientific World Journal

123

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This paper presents a review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA). Comparison of normal and high-strength concrete in which cement has been partially supplemented by mineral admixture has been considered. It has been concluded that mineral admixtures may be categorized into two groups: chemically active mineral admixtures and microfiller mineral admixtures. Chemically active mineral admixtures decrease workability and setting time of concrete but increase the heat of hydration and reactivity. On the other hand, microfiller mineral admixtures increase workability and setting time of concrete but decrease the heat of hydration and reactivity. In general, small particle size and higher specific surface area of mineral admixture are favourable to produce highly dense and impermeable concrete; however, they cause low workability and demand more water which may be offset by adding effective superplasticizer.

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Concrete Materials

Akroyd¹

1962

Concrete

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The Use of Fly Ash and Similar Materials in Concrete.

Cited by 9 publications

References 0 publications

Corrosion of reinforcement in concrete containing wet-stored fly ash

Corrosion of reinforcement in concrete containing wet-stored fly ash

Effects of Different Mineral Admixtures on the Properties of Fresh Concrete

Concrete Materials

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