Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Mussa, Mohamed H.; Abdulhadi, Ahmed M.; Abbood, Imad Shakir; Mutalib, Azrul A.; Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬, Zaher Mundher

doi:10.3390/cryst10040243

Cited by 24 publications

(8 citation statements)

References 62 publications

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“…With the application of more and more fy ash concrete on high in-situ stress environment, it could be found that the stress wave in high in-situ stress environment led to the failure of fy ash concrete. In recent years, some scholars have begun to study the dynamic mechanical properties of fy ash concrete [19][20][21][22][23]. Zhang et al [24] conducted dynamic splitting tests on concrete with fy ash (contents of 0%, 5%, 10%, 15%, 20%, and 30%) and found that the dynamic splitting tensile strength of concrete with water-cement ratio of 0.45 and 0.6 reaches the maximum value when fy ash content is 10%.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fly Ash Contents on Mechanical Properties and Energy Response of Concrete at a High Strain Rate

2023

Advances in Civil Engineering

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The dynamic uniaxial impact compression test was carried out by the Hopkinson pressure bar test system to test the dynamic mechanical properties of concrete with different fly ash contents ( P = 0 , 10%, 20%, 30%, 40%, and 50%) under 0.3 MPa air pressure. The influences of fly ash content variation on the mechanical characteristics, ductility characteristics (which were calculated according to the concrete ductility formula), energy dissipation characteristics, and surface specific energy variation characteristics (which were calculated by converting the fragments into spheres) of concrete were analyzed, respectively, and the influences of fly ash content variation on the fragment distribution and fractal features of concrete were obtained by statistical analysis. In addition, the application of concrete with the change of fly ash contents in rock burst mine was studied. The results showed that the dynamic peak stress, residual stress, ductility characteristics, fragments distribution, fractal dimension, transmitted energy, dissipated energy, and surface specific energy change significantly with the increase of fly ash contents under dynamic uniaxial impact compression. By analyzing the relationship between surface specific energy and concrete fragment distribution, it could be found that the energy dissipated by stress waves in concrete can be estimated by using the particle size distribution of the field fragments.

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Section: Introductionmentioning

confidence: 99%

The Influence of Fly Ash Contents on Mechanical Properties and Energy Response of Concrete at a High Strain Rate

2023

Advances in Civil Engineering

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“…The environmental problem of concrete can be traced to both existing buildings and structural waste whose useful lives have expired, meaning that they must be recycled or repurposed in significant quantities (Fahmy & Idriss, 2019). Thousands of concrete cubes, cylinders, and prisms are generated every day for laboratory testing or the construction of new buildings (Mussa, Abdulhadi, Abbood, Mutalib & Yaseen, 2020), all of which can also be considered waste material. Numerous researchers have consequently undertaken various studies to determine the practicality of employing re-cycled aggregate concrete (RAC) manufactured from waste concrete in new construction projects.…”

Section: Introductionmentioning

confidence: 99%

Prediction of shear strength of CFRP-strengthened reinforced recycled aggregate concrete beams using various strengthening methods

SAHIB

AL-Asadi

2022

srees

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Fibre reinforced polymer (FRP) strengthening is a possible option when the load carrying capacity of a structure needs to be increased for various reasons. On the other hand, the focus nowadays aims to save the environment by reducing the waste material. A suggestion was made to use waste concrete as an aggregate. If this new material was used more, it would be possible to use recycle concrete aggregate (RCA) and carbon fibre reinforced polymer (CFRP) to strengthen reinforced concrete (RC) structures and make them more environmentally friendly. An experimental investigation study on the shear behaviour of RC beams strengthened with CFRP strips was carried out. Tests were conducted on six reinforced concrete beams, with variations in the replacement ratio of RCA and strengthened by different configurations of CFRP under four-point loading. The results indicated that the load carrying capacity was increased, on average, by 18.09 and 35.04% for beams strengthened with CFRP with an inclined strip (IS) and continuous strip (CS) configurations respectively. The results also indicated that the increases in the stiffness were 21.08 and 37.31 for beams strengthened with CFRP in the IS and CS configurations, respectively. In addition the ductility of the beams increased after strengthening.

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“…Engineers quickly started to reuse some of these scrap materials as recycled steel and other metals ingredients in concrete [3]. However, only a small percentage are recycled approximately about 20% to 30% and the remaining is disposed in landfills, causing potentially environmental impacts [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancing of Concrete Properties by Using Aluminium and Iron Residues as a Partial Replacement of Fine Aggregate

Hammadi¹,

Mohammed²,

Ramal³

2022

ACSM

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According to the growing of the world's population, the necessitate for using different building materials such as cement, steel, admixtures, wood and aluminium increased. The main problem faces the world with the increasing need for building materials is the construction wastes, which are a type of environmental pollution that must be reduced. This study focused on aluminium and iron wastes resulted from factories and the possibility to reuse these wastes again like partial replacement from sand with proportions (0.25, 0.5, 0.75 and 1%) in concrete mixtures for both types of residues at ages (7, 14, and 28) days. It had studied the effect of the using of aluminium residues (AR) and iron residues (IR) especially on the mechanical characteristics of concrete. These mechanical characteristics were the compression strength (CS) and tensile strength (TS). The achieved results were compared between the residues concrete specimens and those of reference concrete. Also, the effect of age and replacement percentage for samples which they contain AR and IR had been discussed. The results had shown that the (CS) of iron residues concrete samples (IRC) was increasing with increasing of the iron residues percentage till (0.5%) (IR) in opposite of the observed values of aluminium residues concrete (ARC), as well as for the results of the (TS) of concrete samples which containing the mineral residues at all ages. Where it was observed that the using of aluminium residues (AR) showed a decreasing in the values of (TS) and (CS) compare with reference concrete, but with the use of iron residues (IR) both of (TS) and (CS) results were more than their counterparts of reference concrete at all ages for the first two percentages of replacement.

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Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Cited by 24 publications

References 62 publications

The Influence of Fly Ash Contents on Mechanical Properties and Energy Response of Concrete at a High Strain Rate

The Influence of Fly Ash Contents on Mechanical Properties and Energy Response of Concrete at a High Strain Rate

Prediction of shear strength of CFRP-strengthened reinforced recycled aggregate concrete beams using various strengthening methods

Enhancing of Concrete Properties by Using Aluminium and Iron Residues as a Partial Replacement of Fine Aggregate

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