Mechanical Properties and Sulfate Resistance of High Volume Fly Ash Cement Mortars with Air-Cooled Slag as Fine Aggregate and Polypropylene Fibers

Kim, Jun Hyeong; Qudoos, Abdul; Jakhrani, Sadam Hussain; Rehman, Atta Ur; Lee, Jeong Bae; Kim, Seong Soo; Ryou, Jae-Suk

doi:10.3390/ma12030469

Cited by 15 publications

(10 citation statements)

References 28 publications

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“…They found a reduction in compressive strengths as compared to the control mix after curing for 3 days. Kim et al [51] made high-volume fly ash (HVFA) cement mortars with slag as fine aggregate with a 0.45 w/b ratio. They attained higher compressive strengths than the control mix after 28 days.…”

Section: Resultsmentioning

confidence: 99%

Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles

et al. 2019

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The purpose of this study was to prevent early age autogenous shrinkage in high-strength mortars with saturated tea waste particles. In general, high strength and high performance concretes are made with low water/binder ratios; hence, they are susceptible to shrink at early ages. This shrinkage occurs due to self-desiccation that leads to autogenous shrinkage. To overcome self-desiccation problems in high-strength cement composites, it is necessary to keep the composites moist for a long time. Pre-saturated porous lightweight aggregates and super absorbent polymers are the most commonly used materials in high-strength cement composites to keep them moist for a long time; however, in this study, porous tea waste particles were used to keep the cement mortars moist. Pre-saturated tea waste particles were used in two different size proportions, making up as much as 3% of the volume of the binder. Moreover, commonly used lightweight aggregate (perlite) was also used to compare the outcomes of specimens made with tea waste particles. Different parameters were observed, such as, flow of fresh mortars, autogenous shrinkage, mechanical strengths and microstructure of specimens. The addition of tea waste and perlite particles in mortars made with Ordinary Portland cement (OPC) as the only binder, showed a reduction in flow, autogenous shrinkage and mechanical strengths, as compared to mixes made with partial addition of silica fume. Although, the use of silica fume improved the mechanical strength of specimens. Moreover, the use of saturated tea waste and perlite particles also improved the microstructure of specimens at an age of 28 days. The results revealed that the saturated tea waste particles have the ability to prevent autogenous shrinkage but they reduce strength of high-strength mortars at early ages.

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Section: Resultsmentioning

confidence: 99%

Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles

et al. 2019

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“…As lime water is a diluted form of calcium hydroxide, a low water to binder ratio was required to get a better compressive strength. With 50% ultra-ne y ash substitution, the impact of utilizing saturated lime water in concrete casting was shown to be bene cial in improving the 28th day compressive strength of HVFA concrete [14]. On HVFA concrete cast with raw y ash, however, the increase in strength was less noticeable [14].…”

Section: Ca(oh) 2 + H 4 Sio 4 ( Y Ash Content) + H 2 O → (C-s-h) Gel (2)mentioning

confidence: 99%

“…The spherical form of the y ash contributed to the increase in workability of HVFA concrete. Fly ash's spherical form decreases friction between the y ash and other aggregates in the slurry, making it more workable [14,31].…”

Section: Workability Analysismentioning

confidence: 99%

“…However, as compared to Class F y ash, Class C y ash has a weaker resistance to sulphate attacks and less suppressing capacity for alkalisilica growth [11,12]. One of the primary bene ts of HVFA concrete, according to Rashad [13] and Kim et al [14], was its resistance to sulphate attack. The high calcium y ash Class C, on the other hand have a negative impact on these HVFA concrete's most important characteristics.…”

Section: Ca(oh) 2 + H 4 Sio 4 ( Y Ash Content) + H 2 O → (C-s-h) Gel (2)mentioning

confidence: 99%

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Compressive Strength of High-Volume Fly Ash (HVFA) Concrete as a Function of Lime Water and Curing Time

Yun

Rahman

Kuok

et al. 2021

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The compressive strength of high-volume fly ash (HVFA) concrete with varied volume percentages of 40%, 50%, and 60% was examined utilizing low calcium fly ash (Class-F) as a partial replacement for regular Portland cement in this study. On the 7th, 28th, and 56th days, the compressive strength is tested. At the 7th and 28th days, the influence of saturated lime water on the compressive strength of HVFA concrete is evaluated. The inclusion of fly ash as a replacement for Portland cement reduces the compressive strength of the HVFA concrete, according to the findings. At the 56th day, the HVFA concrete with 40% fly ash substitution has a compressive strength equivalent to the regular weight concrete. At the 28th day, it was discovered that saturated lime water was helpful in maximizing the strength of HVFA concrete with 50% fly ash substitution. There was additional information about the characterization of HVFA concrete.

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“…Due to increased population growth and advancement in infrastructure development, uncontrolled extraction of aggregates from the riverbed is a major concern [ 15 ], which may compromise the needs of the future generation. Therefore, constant efforts are employed to replace aggregate with artificial and recycled aggregate in concrete to fulfill the aggregate demand for achieving sustainable concrete [ 16 , 17 , 18 , 19 , 20 ]. Several studies were conducted to conserve natural fine aggregate by replacing it with agroindustrial waste ashes [ 21 ], including rice husk ash (RHA) [ 22 ] sugar cane bagasse ash [ 23 ], waste foundry sand, and bottom ash [ 24 ], as a partial sand substitute for the conservation of natural river sand resources.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Wheat Straw Ash as Partial Sand Replacement for Production of Eco-Friendly Concrete

et al. 2021

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The depletion of natural sand resources occurs due to excessive consumption of aggregate for concrete production. Continuous extraction of sand from riverbeds permanently depletes fine aggregate resources. At the same time, a major ecological challenge is the disposal of agricultural waste ash from biomass burning. In this study, an environmental friendly solution is proposed to investigate the incorporation of wheat straw ash (WSA) by replacing 0, 5, 10, 15, and 20% of sand in concrete. Characterization results of WSA revealed that it was well-graded, free from organic impurities, and characterized by perforated and highly porous tubules attributed to its porous morphology. A decrease in fresh concrete density and an increase in slump values were attained by an increase in WSA replacement percentage. An increasing trend in compressive strength, hardened concrete density, and ultrasonic pulse velocity was observed, while a decrease was noticed in the values of water absorption with the increase in WSA replacement percentages and the curing age. The WSA incorporation at all replacement percentages yielded concrete compressive strength values over 21 MPa, which complies with the minimum strength requirement of structural concrete as specified in ACI 318-19. Acid resistance of WSA incorporated concrete improved due to the formation of pozzolanic hydrates as evident in Chappelle activity and thermogravimetric analysis (TGA) results of WSA modified composites. Thus, the incorporation of WSA provides an environmentally friendly solution for its disposal. It helps in conserving natural aggregate resources by providing a suitable alternative to fine aggregate for the construction industry.

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Mechanical Properties and Sulfate Resistance of High Volume Fly Ash Cement Mortars with Air-Cooled Slag as Fine Aggregate and Polypropylene Fibers

Cited by 15 publications

References 28 publications

Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles

Prevention of Autogenous Shrinkage in High-Strength Mortars with Saturated Tea Waste Particles

Compressive Strength of High-Volume Fly Ash (HVFA) Concrete as a Function of Lime Water and Curing Time

Incorporation of Wheat Straw Ash as Partial Sand Replacement for Production of Eco-Friendly Concrete

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