Effects of Recycled Aggregate on Concrete Mix and Exposure to Chloride

Nakhi, Ammar Ben; Alhumoud, Jasem M.

doi:10.1155/2019/7605098

Cited by 18 publications

(10 citation statements)

References 20 publications

(22 reference statements)

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“…The maximum size of CA used was in the range between 12 and 20 mm. As per IS 383 (2016), the grading curves for fine, CA and RCA are shown in Figure 1, the proportion of the CA and RCAs used in this study was 60:40 based on earlier research work (Ben Nakhi and Alhumoud, 2019;Puthussery et al, 2017;Malešev, 2020;Panizza, 2020).…”

Section: Methodsmentioning

confidence: 99%

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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Purpose This study aims to develop geopolymer concrete (GPC) using manufactured sand (M-sand) and recycled concrete aggregate (RCA) under different curing conditions. GPC is a sustainable construction material developed with industrial waste products such as fly ash to eliminate the use of cement in the production of concrete. GPC requires heat curing for the attainment of early age strength. The development of GPC under heat curing conditions is a hard process in practice. To overcome such circumstances, an attempt was made to develop the GPC under different curing conditions with the aid of coarse aggregate (CA) and RCA. The influence of different curing conditions on strength gain and microstructural characteristics of GPC is investigated. Mechanical properties of GPC such as compressive strength, tensile strength, flexural strength and elastic modulus are reported and discussed. Design/methodology/approach This study focuses on the assessment of mechanical and microstructure characterization of eco-efficient GPC developed with natural CA and RCAs. The required optimum quantity of binder, alkali activator, alkaline liquid to binder ratio and aggregates was determined by appropriate trials. Three types of curing methods, namely, ambient, oven and water, were used for the development of GPC mixes. Following the properties of RCA, it is realistic to substitute up to 40% of coarser aggregates as the resulting aggregate mix falls within the requirements of the analyzed mix. Findings Special attention is required for the mix with RCA because the mix’s consistency is affected by the high water absorption of the RCA mix. GPC specimens cured at ambient and water conditions exhibited marginal variation in the compressive strength for both CA and RCA. The compressive strength of GPC mixes prepared with RCA was marginally higher than that of the GPC made with CA under different curing regimes. RCA can be used as a sustainable material in lieu of CA in GPC. Originality/value The main significance of this research work is to develop the optimal mix design with appropriate mix proportion. The present study proposes a satisfactory methodology that enhances the mechanical strength of GPC as the guidelines are not available in the standards to address this problem. Effective use of waste materials such as fly ash and recycled aggregate for the development of GPC is another major research focus in the proposed investigation.

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Section: Methodsmentioning

confidence: 99%

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Kanagaraj

Kiran

Anand

et al. 2022

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“…The holding power among concrete and steel is fundamentally a direct result of the grasp between network (cement, sand, and water paste) and aggregate. Cooperation of holding rises up out of crushing of all out stage to harden stick and significant lattice to developing steel, mechanical dock of ribs against the considerable surface as nitty gritty [8]. As made lightweight sums or reused aggregates (RA) have higher flakiness document, it animates more security than standard concrete.…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior of Nanocoated Oil Palm Shell as Coarse Aggregate in Lightweight Concrete

Nadh

Krishna

Natrayan

et al. 2021

Journal of Nanomaterials

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Oil palm shells (OPS) are mechanical waste that is utilized as coarse aggregates in lightweight concrete. These OPS have shape and strength like conventional aggregates yet the substantial made with these OPS invigorates a limit of 18 MPa. The characteristic strength which must be utilized in structures is seen to be around 25 MPa to 30 MPa. Considering the strength as one of the boundaries for design to be sturdy, the OPS are surface-covered with nanosilane compound. This nanosilane covering goes about as infill on the outside of the aggregates and holds the concrete paste as traditional cement. Operations are permeable in nature; their inner construction has permeable design which makes the aggregates frail. Nanosilane coatings go about as holding between the concrete stage and aggregate stage and hold the substantial solid. In the present examination, mechanical and underlying conduct of nanocovered oil palm shell lightweight concrete is contrasted with that of regular cement. Nanocovered oil palm shell lightweight substantial shows comparative strength as customary cement and decrease in nonsustainable wellspring of energy in oil palm shell lightweight concrete. Supplanting of customary cement with oil palm shell concrete addresses the modern waste which can be utilized for making concrete solid and solid. Morphology and material portrayal of oil palm shell and ordinary aggregates are investigated.

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“…This also applies to the chloride penetration ratio of the concrete. According to previous studies, [15] the problem of chloride penetration behavior could be solved by decreasing the water over cement ratio. This would help the concrete yield the desirable strength.…”

Section: Chloride Penetration Behaviormentioning

confidence: 99%

Chloride Penetration Behavior of Concrete Made from Various Types of Recycled Concrete Aggregate

Yodsudjai

Nitichote

2022

Sustainability

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This research aimed to identify the link between the chloride penetration behavior of concrete made from various types of recycled aggregate from three main sources—building demolition waste (B-RCA), laboratory waste (L-RCA), and precast concrete waste (P-RCA)—and the 28-days compressive strength of natural aggregate concrete with the replacement ration 30%, 60% and 100% respectively. The results of the study revealed that the quality of recycled aggregate waste significantly impacted concrete behavior. To elaborate, finer aggregate potentially increased the inter-facial transition zone (ITZ), which is the weakness part of concrete, resulting in the concrete having less compressive strength as well as increasing amount of chloride ion penetration thought rapid test. In this research, an image processing technique, which is a simple method, was used to quantify the ITZ area of concrete. It was found that concrete with low compressive strength and high permeability values had an ITZ area significantly more than other types of concrete.

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Effects of Recycled Aggregate on Concrete Mix and Exposure to Chloride

Cited by 18 publications

References 20 publications

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Development and strength assessment of eco-friendly geopolymer concrete made with natural and recycled aggregates

Structural Behavior of Nanocoated Oil Palm Shell as Coarse Aggregate in Lightweight Concrete

Chloride Penetration Behavior of Concrete Made from Various Types of Recycled Concrete Aggregate

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