Binary blended fly ash concrete with improved chemical resistance in natural and industrial environments

Harilal, Manu; George, R.P.; Philip, John; Albert, Shaju K.

doi:10.1007/s11356-021-12453-4

Cited by 12 publications

(8 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4 shows the diffraction pattern of fly ash blended cement hydrated with ASW at 3, 7, 28, 56, and 90 days. These patterns exhibit strong peaks of portlandite (CH) located at 2θ 18.1 • , 29 20,21,25,34,38,41,42 A comparison of the peak intensities between fly ash blended cement mixed with ASW and/or DIW provides interesting insights into their relative compositions of each system. The effectiveness of seawater on the hydrated fly ash blended cement is associate with the high components of Cl − and SO 4 2− ions in seawater that interact with CH, CSH, CAH, and AFm phases to produce gypsum (Gy), TA B L E 3 Compressive strength and the difference of compressive strength of fly ash blended cement with artificial seawater (ASW) and deionized water (DIW) (as a reference) at 3,7, 28, 56, and 90 days.…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 99%

“…20 Moreover, these products appear to be settled compounds from the onset of the hydration and keep the rate of hydration higher at later ages, which approves with the previous results. 8,32,34,41,42 This may illustrate the differences in XRD intensities of major peaks of resulting crystalline phases between the system with ASW and the one with deionized water (DIW).…”

Section: Paste Typementioning

confidence: 99%

“…These results confirm the accelerated influence of fly ash blended cement hydration in the presence of seawater, which explains the noticeable increase in the early strength development. 8,41,42 This is attributed to the pozzolanic activity of fly ash, as well as to the presence of different highly soluble salts in seawater, according to Equations ( 1)-( 7), which strongly accelerates the spontaneous reactions of CH, CSH, CAH, and AFm with sulfate (SO 4 2− ) and/or chloride (Cl − ) ions, to form gypsum (Gy), ettringite (AFt), and FS, along with extra CH and silicagel, which seems to be settled compounds from the onset of the hydration process. For a specific amount of fly ash, the compressive strength of fly ash blended cement mixed with ASW is increased with the increase in curing ages.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…16,52,53,55 Figures 13F-J and 14F-J show the SEM images for the microstructures of the hydrated fly ash blended cement in seawater at 3, 7, 28, 56, and 90 days. SEM imaging (Figure 13F-J) introduces the growth of, pseudo-hexagonal crystals morphology of FS, a needle-or whisker-like morphology of ettringite (AFt) and/or gypsum (Gy) crystals, and hexagonal-platelet morphology of portlandite (CH) in combination with dense-fibrils morphology of CSH-gel, 16,21,32,41,42,47,49 according to Equations ( 1)-( 7), as well as the pozzolanic and hydration products around the spherical particles of fly ash with a dissolved surface and/or a covered surface. As can distinctly be observed in Figure 13F-J, the amounts of these phases/crystals extremely change according to the hydration time (3, 7, 28, 56, and 90 days).…”

Section: Scanning Electron Microscope (Sem)mentioning

confidence: 99%

See 3 more Smart Citations

The effectuation of seawater on the microstructural features and the compressive strength of fly ash blended cement at early and later ages

et al. 2023

View full text Add to dashboard Cite

The current work scrutinizes the effectuation of seawater on morphological properties, pore structure, and compressive strength during the hydration process of fly ash blended cement at 3, 7, 28, 56, and 90 days to better understand the influence of salinity conditions of seawater on the microstructural modification and strength development of the hydration products as well as the total porosity. The chemical reaction's mechanism of mightily soluble salts, for example, Mg2SO4 and NaCl, with hydrated fly ash and blended cement (calcium‐bearing phases) was also confirmed. Fourier‐transform infrared spectroscopy has been appointed to observe and characterize the energetics of variation in the formulation of portlandite (CH), calcium silicate hydrate, gypsum (Gy), ettringite (AFt), and calcium chloroaluminate (Friedel's salt [FS]) throughout the hydration process of fly ash blended cement with seawater in comparison with deionized water. X‐ray diffraction analysis exposed that the peak intensities of FS, portlandite, and some particular phases of the hydrated fly ash blended cement in seawater are higher and sharper than the comparable peaks in deionized water. Mercury intrusion porosimetry‐measurements have been appointed that the total porosity of artificial seawater (ASW) was decreased from 28.9% at 3 days to 19.4% at 56 days. In addition, the average, median, and critical pore diameter were decreased in ASW while compared to deionized water (DIW). The reaction products of this work were also characterized using scanning electron microscopy, EDS, compressive strength, and isothermal calorimeter.

show abstract

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 99%

Section: Paste Typementioning

confidence: 99%

Section: Compressive Strengthmentioning

confidence: 99%

Section: Scanning Electron Microscope (Sem)mentioning

confidence: 99%

See 2 more Smart Citations

The effectuation of seawater on the microstructural features and the compressive strength of fly ash blended cement at early and later ages

et al. 2023

View full text Add to dashboard Cite

show abstract

“…By measuring its compressive strength and mass, it was found that the sulfate solution had a more obvious erosion effect on concrete, and the strength loss rate of samples in the erosion solution decreased with increasing electric eld stimulation ratio. Harilal et al (2021) carried out a study on concrete deterioration under the action of natural seawater, sulfuric acid and magnesium sulfate solution and used a mixture composed of FA, nanoparticles and sodium nitrite inhibitor (CFNI) to partially replace cement. By analysing the concrete mass loss rate and compressive strength, it was found that CFNI showed good corrosion resistance in three corrosion solutions.…”

Section: Introductionmentioning

confidence: 99%

Durability and life prediction of fly ash geopolymer concrete in corrosion environments caused by dry and wet circulation

Sun

Wang

et al. 2022

Environ Sci Pollut Res

View full text Add to dashboard Cite

The use of tailings, waste rock, y ash and slag to prepare geopolymer concrete can effectively solve the problems of land resources occupied by tailings and waste rock, low utilization rate and environmental pollution. Using a dry-wet circulation method, y ash for a different corrosion solution to geopolymer concrete (referred to as TWGPC) was analysed. Through an appearance change, the corrosion resistance coe cient of the compressive strength, relative dynamic elastic modulus, tensile splitting strength, relative mass and durability were investigated, using scanning electron microscopy (SEM) analysis of the microstructure, The life of TWGPC was predicted based on the GM(1,1) prediction model of grey system theory. The test results show that with an increase in the number of dry-wet cycles, the surface of the specimen crystallizes, cracks, spalls and exhibits other phenomena. The compressive strength corrosion coe cient, relative dynamic elastic modulus, crack tensile strength and relative mass show a trend of increasing rst and then decreasing, nally reaching the peak value after 40 cycles. The erosion products generated by the early reaction ll the slurry aggregate pores and improve the strength of TWGPC. In a later stage, a large number of erosion products absorb water and expand, the internal pores of TWGPC are connected, leading to a decrease in strength. Clinhibits the corrosion of SO 4 2in concrete and improves the durability of concrete.

show abstract

Improvement of eco-efficient self-compacting concrete manufacture by recycling high quantity of waste materials

Hilal

Hadzima-Nyarko

2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Recycling plastic waste to obtain new materials such as concrete or mortar seems to be one of the best solutions for disposing of plastic waste. Second, in the construction industry, due to the increasing costs of land lls and the lack of a natural large aggregate, the increased interest in crushed ceramics is signi cant. The third type of waste that is dealt with in this article is tea ash because tea is the second most consumed beverage in the world and large amounts of waste are generated. This article attempts to develop the appropriate characteristics of self-compacting concrete by adding the following waste materials: plastic waste, tea waste and collapsed ceramics. In this paper, Fresh and hardened properties of self-compacting concrete with waste materials were investigated. The diameter and time of sediment ow, segregation, L-box ratio, and density of freshly compacted concrete mixtures were measured. Moreover, both 7, 14, and 28-day bending strength and 7 and 28-day bending strength of hardened selfcompacting concrete samples were measured. The results proved the possibility of using plastic waste, tea waste and collapsed ceramics in self-compacted concrete, because they do not signi cantly reduce the hardened and fresh properties of self-compacted concrete.

show abstract

Binary blended fly ash concrete with improved chemical resistance in natural and industrial environments

Cited by 12 publications

References 70 publications

The effectuation of seawater on the microstructural features and the compressive strength of fly ash blended cement at early and later ages

The effectuation of seawater on the microstructural features and the compressive strength of fly ash blended cement at early and later ages

Durability and life prediction of fly ash geopolymer concrete in corrosion environments caused by dry and wet circulation

Improvement of eco-efficient self-compacting concrete manufacture by recycling high quantity of waste materials

Contact Info

Product

Resources

About