Effect of fly ash on compressive strength of concrete containing recycled coarse aggregate

Rohman, Rosyid Kholilur; Aji, Seno

doi:10.1063/1.5054501

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…Several additions have been used together with C&DW as recycled aggregates, mainly with concrete recycled aggregates. Most of the results conclude that the combination of recycled concrete aggregate and fly ash [24,25] is not very beneficial for the mechanical resistance of concrete. A previous work limits the percentage of fly ash to 10% [25].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the results conclude that the combination of recycled concrete aggregate and fly ash [24,25] is not very beneficial for the mechanical resistance of concrete. A previous work limits the percentage of fly ash to 10% [25]. Other authors justify the use up to 30% of fly ash with recycled aggregate because the materials do not show a loss of flexural strength [26].…”

Section: Introductionmentioning

confidence: 99%

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On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

et al. 2019

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Industrial wastes are often used as aggregate in concrete production to promote a more sustainable construction and to reduce production costs. This article presents the results of an experimental campaign on the influence of replacing natural aggregate with several construction and demolition wastes (C&DW) as recycled aggregate, as well as the use of fly ash and slag, wastes produced in Gas Incinerator Combined Cycle (GICC) thermal power plants, in the mix design of non-structural concrete. Different percentages of natural aggregates were substituted with recycled aggregates either coming from construction and demolition wastes, or from the coarse fraction of the slags from thermic plants in the manufacture of concrete. The mechanical properties, capillary water absorption, density, carbonation, chloride ingress and sulphate resistance have been tested. The results show a decrease in properties when C&DW are used. Fine fraction of slag and fly ash has an important advantage, and can even improve the long term properties of concrete prepared with natural aggregates. Coarse fraction of slag as a recycled aggregate generally improves most of the properties of manufactured concretes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

et al. 2019

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“…Rohman and Aji [25] experimented with the use of lightweight fly ash aggregate in polymer concrete. It was revealed that the tensile strength/compressive strength ratio was notably higher than that of traditional cement concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Laced Built-Up Lightweight Concrete Encased Columns Subjected to Cyclic Axial Load

Divyah

Prakash²,

Srividhya³

et al. 2023

Buildings

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The steel-concrete composite column comprises a steel core and surrounding concrete. The purpose of the system is to provide analysis and design techniques for a newly invented class of laced steel-concrete composite short columns for cyclic axial loads. To minimize the increasing density issues associated with nominal strength concrete and in consideration of the depletion of natural resources required to produce concrete, factory-obtained lightweight sintered fly ash aggregates with and without basalt fiber are employed. The normal-weight concrete containing basalt fiber is shown to be more ductile than any other column. The axial deformation of columns LNA and LSA at failure was found to be 3.5 mm, whereas columns LNAF and LSAF reached an axial shortening of 4.5 mm at failure. The column LSAF was found to have 5.3% more energy absorption than the LSA and 11.5% less than the column LNAF. It was observed that the rigidity of these fabricated components had been enhanced. It was found that the section configuration with a lacing system had improved confinement effects and ductility. Comparing the finite element analysis to the experimental data revealed a strong connection with numerical modeling, with a variance of around 8.77%.

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“…Studies by Van Tien Phan et al [8] larger percentages of RCA embedding can reduce strength, however a larger concentration of fly ash can be used to achieve concrete strength.If the natural coarse aggregate were put back with recycled coarse aggregate, the effects of fly ash on strength is more effective. [9].Furthermore, the extraction of virgin aggregates produces substantial environmental harm, and both the extraction and crushing procedures demand significant energy. [10,11].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Strength and Durability Properties of Recycle Aggregate and Fly Ash in Concrete

Reddy,

Srikrishna,

Praveen

2023

IOP Conf. Ser.: Earth Environ. Sci.

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In this investigative study the Natural Coarse Aggregate (NCA) were put back with Recycled Course Aggregate (RCA) at peculiar proportions, the mechanical performance and durability properties of concrete are examined. The inclusion of fly ash (FA) is also introduced as stand–in of Cement. The present investigation aims to determine the effect of RCA as an stand-in material to NCA and to analyze the fresh properties like workability, density and hardened properties like Compressive Strength, Flexure Strength, Split Tensile Strength and durability properties like Water permeability and Sorptivity. Mix is formulated for water cement ratio 0.40. The specimens were casted of replacing virgin aggregate with RCA by 10% and 20%, and cement with FA by 10%, 20% and 30%. All the specimens are cured for 7 and 28 days as per requirement later they are tested. The acquired data are then compared between the strength of NCA of concrete and the proportion of RCA and FA. The outcome view is in such a way that the workability of concrete will decline as the replacement of RCA increases, by which it should limited to a fixed percentage (10% or 20%). The density of concrete is not altered by the put back of FA, but raise in percentage of RCA replacement could alter the density of concrete. In case of Compressive, Flexure and Split tensile strength of concrete the optimum strength obtained for 10% FA and 10% RCA for 7 and 28 days was similar to that of 100% NCA and 0% FA and durability studies also gave the optimum results for the same replacement.

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Effect of fly ash on compressive strength of concrete containing recycled coarse aggregate

Cited by 9 publications

References 3 publications

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

Experimental and Numerical Investigations of Laced Built-Up Lightweight Concrete Encased Columns Subjected to Cyclic Axial Load

Investigations on Strength and Durability Properties of Recycle Aggregate and Fly Ash in Concrete

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