A sustainable approach to designing high volume fly ash concretes

Kudva, P. Laxman; Nayak, Gopinatha; Shetty, Kiran Kumar; Sugandhini, H. K.

doi:10.1016/j.matpr.2022.04.165

Cited by 3 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The materials are proportioned and mixed in a unique mixer to get the desired consistent mix. The PPF is added at this stage to ensure efficient fiber distribution [6]. Figure 3 shows test specimens cured in the tank after demolding, and Figure 4 demonstrates the research plan adopted for the study.…”

Section: Cementmentioning

confidence: 99%

“…As the world's second-largest market, India is estimated to produce more than 500 million tonnes of cement by 2050 [4]. While concrete production is estimated to increase by 20% in 2050, using locally sourced industrial byproducts to supplement the conventional binder and aggregate of concrete will positively impact the industry [5,6]. Coal-fired power plants in India fulfill much of the energy demand, producing 232.56 million metric tonnes of fly ash (FA) in 2020-2021.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Properties of Fiber-Reinforced High-Volume Fly-Ash-Based Cement Composite—A Long-Term Study

Kudva,

Nayak,

Shetty

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

This article presents the long-term mechanical properties of a novel cement composite, no-aggregate concrete (NAC), containing 80% of low-calcium (class F) fly ash (F-FA) and 20% ordinary Portland cement (OPC) without aggregates. The study investigates the effect of adding polypropylene fibers (PPFs) in varying volume fractions to NAC by conducting compressive, splitting tensile, flexural, bond strength, and sorptivity tests, emphasizing the morphological features over a curing duration of up to three years. The results indicate that adding PPF has an insignificant effect on compressive strength. However, flexural, splitting tensile, and bond strength improve with an increasing volume fraction of PPF. The addition of PPF achieves a ductile failure which is desirable. The initial and final water absorption rate (sorptivity) reduces with the addition of PPF. Further, scanning electron microscopy (SEM) images reveal dense precipitation of C-S-H, while energy-dispersive X-ray spectroscopy (EDS) quantifies the hydration products. The ultrasonic pulse velocity (UPV) affirms the composite’s excellent quality.

show abstract

Section: Cementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Fiber-Reinforced High-Volume Fly-Ash-Based Cement Composite—A Long-Term Study

Kudva,

Nayak,

Shetty

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…The most commonly used concrete additives include fly ash, employed as a cement replacement, or micro-aggregate. Fly ash improves the workability of the concrete mix, delays slurry setting, reduces shrinkage and early strength and increases strength in the later stages of concrete maturation [9][10][11][12][13]. Another frequently used additive is silica dust, which seals the concrete structure, reduces permeability to chlorides and sulfates and increases mechanical strength [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

et al. 2022

View full text Add to dashboard Cite

In this study, the possibility of using mixing water containing O2 and O3 micro-nano bubbles (M-NBs) in concrete technology was investigated. In particular, the effect of micro-nano bubbles on the durability and frost resistance of concrete was analyzed. Concretes with two types of micro-nano bubbles were studied. The physical properties of both the modified concretes and the reference concrete were determined, i.e., specific and apparent density, porosity, weight absorption and coefficient of water absorption. Mechanical parameters based on compressive and flexural strength were tested after 14 and 28 days of curing. Concrete durability was determined on the basis of frost resistance and resistance to salt crystallization. The pore distribution in the cement matrix was determined based on porosimetry studies. The use of water with micro-nano bubbles of O2 and O3, among others, contributed to a reduction in the water absorption coefficient from 42.7% to 52.3%, in comparison to the reference concrete. The strength characterizing the concrete with O3 increased by 61% after 28 days, and the frost resistance after 150 F-T cycles increased by 2.4 times. Resistance to salt crystallization improved by 11% when water with O3 was used.

show abstract

Study on the Performance of Foam Concrete Prepared from Decarburized Fly Ash

Guo

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

Although the energy structure has been gradually enriched in recent years, China, as the world’s largest producer and consumer of coal, still accounts for more than 50% of resources. Therefore, in this paper, the high carbon fly ash raw ash (HCFARA) was mechanically activated, and the flotation was treated to obtain decarburized fly ash (DFA) with a loss on ignition of 1.18%, water demand ratio of 101% and strength activity coefficient of 74.5%. With the exception of for water demand ratio, the rest meet the national requirements for the use of Class I fly ash. The foam concrete was prepared by partially replacing cement with decarburized fly ash in different proportions and at different water-to-cement ratios (0.3, 0.4 and 0.5) in order to study its dry density, porosity, compressive strength and thermal conductivity. The results show that the porosity of foam concrete grows with the increase in water-to-cement ratio and fly ash replacement rate. In addition, the dry density and thermal conductivity of the prepared foam concrete can meet the requirements of A05 grade foam concrete (Density less than 500 kg/m3, thermal conductivity less than 0.12 W/(m·k)). The compressive strength can meet the requirements of C0.3gradefoam concrete (Minimum use standard).

show abstract

A sustainable approach to designing high volume fly ash concretes

Cited by 3 publications

References 16 publications

Mechanical Properties of Fiber-Reinforced High-Volume Fly-Ash-Based Cement Composite—A Long-Term Study

Mechanical Properties of Fiber-Reinforced High-Volume Fly-Ash-Based Cement Composite—A Long-Term Study

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

Study on the Performance of Foam Concrete Prepared from Decarburized Fly Ash

Contact Info

Product

Resources

About