The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Feng, Jing; Sun, Jianwei; Yan, Peiyu

doi:10.1155/2018/4023178

Cited by 35 publications

(16 citation statements)

References 31 publications

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“…Moreover, their use is growing at a faster rate for the development of sustainable cement-based materials [3,4]. Comprehensive analysis has been conducted on these ashes by a variety of investigators to assess their pozzolanic activity [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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In developing countries, one of the usual practices is the uncontrolled, open burning of corn stalk (CS) or its utilization as a fuel. It is known that the ash obtained under uncontrolled burning conditions constitutes blackish and unburnt carbon particles as well as whitish and grayish particles (representing crystallization of silica) due to over burning. However, controlling the burning process can improve the quality of ash produced to effectively use it in cement-based materials. Hence, this research was aimed at exploring the pozzolanic properties of corn stalk ash upon calcination and grinding, for it to be used in the manufacturing of sustainable cement-based materials. In order to obtain a suitable corn stalk ash (CSA), which can be used in cement/concrete, a research investigation consisted of two phases. In the first phase, calcination was carried out at 400°C, 500°C, 600°C, 700°C, and 800°C for 2 hours. The tests applied on the resulting ashes were weight loss, XRD, pozzolanic activity index (PAI), Chapelle, Fratini, and consistency. From XRD spectra, it was found that, at lower temperatures, silica remained amorphous, while it crystallized at higher temperature. Ash combusted at a temperature of 500°C possessed largest pozzolanic activity of 96.8%, had a Fratini CaO reduction of 93.2%, and Chapelle activity of 856.3 mg/g. Thus, 500°C was chosen as an optimum calcination temperature. In the second phase, the ash produced at 500°C was grinded for durations of 30, 60, 120, and 240 minutes to ascertain the optimum grinding times. Resulting ashes were examined for hydrometer analysis, Blaine fineness, Chapelle activity, and pozzolanic activity. Experiment outcomes revealed a direct relationship between values of Blaine fineness, surface area, Chapelle activity, PAI, and grinding duration. It was concluded that CSA can be used as a pozzolan, and thus, its utilization in cement/concrete would solve ash disposal problems and aid in production of eco-friendly cement/concrete.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Memon

Khan

Wahid

et al. 2020

Advances in Materials Science and Engineering

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“…This phenomenon could be due to the addition of fly ash in the concrete. Previously, researchers showed that the presence of fly ash in concrete delays the hydration process and the concrete has low strength in the early stages, and the concrete improves in strength at a later stage (after 60 days) [32,33]. The variations in compressive strength are shown in Figure 3.…”

Section: Mechanical Properties Evolutionmentioning

confidence: 91%

Investigation on the Mechanical Properties and Post-Cracking Behavior of Polyolefin Fiber Reinforced Concrete

Adhikary

Rudžionis

Balakrishnan

et al. 2019

Fibers

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This paper deals with the behavior of concrete’s self-compatibility in a fresh state and its compressive and flexural strength in a hardened state with the addition of polyolefin macro fibers. Four different amounts (3 kg/m3, 4.5 kg/m3, 6 kg/m3, and 9 kg/m3) of polyolefin macro fibers were mixed into the concrete mixture to observe the differences in workability and strength properties between the concrete specimens. As a partial replacement of cement, class C type of fly ash was added to make up 25% of the total cement mass. The water-binder ratio (W/B) of the concrete mix was 0.36. Superplasticizer was added to the concrete mixture to achieve self-compacting properties. The slump test was carried out in the fresh state for determining the flowability. On the 7th and 28th days of the curing process, compression strength tests were performed, and on the 28th day, flexural strength tests and crack mouth opening displacement (CMOD) analyses were carried out to determine the strength properties and post-cracking behavior of the concrete samples. Bending strength and post-cracking behavior of the samples were improved by the addition of fibers. The fiber concentration in the concrete mixture greatly influenced the slump flow and self-compaction properties.

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“…Using the fly ash as a partial replacement for cement also contributes to the increase in durability of cement composites as the fly ash is capable of pozzolanic reaction with calcium hydroxide, which produces additional calciumsilicate hydrates (C-S-H) and calcium-aluminium-silicate hydrates (C-A-S-H). ey additionally cause refinement and reduction of permeability of pore structure of cement matrix as the pozzolanic reaction is slower than hydration of cement as presented in the studies of Moffatt et al [12] and Feng et al [13].…”

Section: Introductionmentioning

confidence: 99%

Use of Secondary Crystallization and Fly Ash in Waterproofing Materials to Increase Concrete Resistance to Aggressive Gases and Liquids

Drochytka

Lédl

Bydžovský

et al. 2019

Advances in Civil Engineering

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This paper describes the use of cement-based waterproofing screed and waterproofing coating, in which 10% of the original amount of cement was replaced by fly ash and 2% of the crystallization admixture was added by weight of cement, as a mean of protection of concrete against aggressive environments. The modified materials were applied to the underlying concrete and subjected to testing of physical and mechanical properties after exposure to effects of aggressive environments for up to 18 months. The results of the analysis have shown that after the application of waterproofing materials, there is a sufficient development of the crystals in the underlying concrete to enhance its durability. Thus, it is possible to use fly ash functionally and efficiently in polymer cement systems as a substitute for the cement together with the crystallization admixture.

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The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

Cited by 35 publications

References 31 publications

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Evaluating the Effect of Calcination and Grinding of Corn Stalk Ash on Pozzolanic Potential for Sustainable Cement‐Based Materials

Investigation on the Mechanical Properties and Post-Cracking Behavior of Polyolefin Fiber Reinforced Concrete

Use of Secondary Crystallization and Fly Ash in Waterproofing Materials to Increase Concrete Resistance to Aggressive Gases and Liquids

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