Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks

Abstract

The goal of this study is to see how the effect of recycled concrete aggregate admixed with mineral admixtures and Nano-silica on concrete's durability after being exposed to aggressive media attacks. The coarse aggregates applied in the concrete were dolomite (control) and recycled concrete aggregate with the addition of various mineral admixtures such as ground granulated blast slag (GGBFS), granite, and Nano-silica. To lower the water/cement ratio, a superplasticizer (SP)-type (F) was used. The physical and mechanical properties of commonly used raw materials such as aggregates and other various concrete kinds were investigated. The effects of saltwater and 3% sodium chloride on concrete mechanical and microstructures properties were investigated. The slump values of dolomite concrete were found to be lower than those of recycled aggregate concrete. The concrete mix using recyclable aggregate has the highest compressive strength, according to the results. In terms of compressive strength, the addition of 1% NS (Nano-silica) and 15% slag increased both mechanical and durability properties of the recycled aggregate concrete in aggressive media.

Investigating the Effects of Recycled Aggregate and Mineral Admixtures on the Mechanical Properties and Performance of Concrete

“…The concrete produced with recycled aggregate has a better compressive strength than the concrete constructed with dolomite aggregate due to the improved interlocking between their porous textures and cement paste. Similar results were reported in [ 25 , 32 , 40 ]. In contrast, the results show that the compressive strength values increased with the addition of nanosilica by 26.1%, in the case of D70W30-1N, and the binary cementing materials by 39.2%, 45.6%, and 30.9%, in the case of D70W30-1N-10G, D70W30-1N-15S, and D70W30-1N-1.5A, respectively, at the age of 28 days.…”

“…The addition OF aluminum waste to concrete mixtures reduces THE slump value compared to mixes with 1% NS and 10% granite or 1% NS and 15% slag due to aluminum powder’s high water absorption value. [ 40 , 45 ].…”

“…According to experiments [ 35 , 36 ] performed on concrete samples created by completely swapping out the original aggregates for recycled aggregates that contained a mineral admixture of fly ash (FA), slag (BFS), and silica fume (SF), concrete properties can be developed to meet requirements with the correct mineral selection and proportioning. Recent years have seen a growing interest in nanotechnology for cement research due to the superior physical and mechanical properties of nanomaterials [ 37 , 38 , 39 , 40 ]. Different nanoparticles have been effectively used in concrete to enhance its mechanical properties and great durability.…”

“…The surrounding aggressive environment often leads to the deterioration of concrete structures. In a marine setting, chloride ion (Cl − ) entered concrete through water or sea winds carrying salt ions that eroded the concrete [ 40 , 41 , 42 , 43 , 44 , 45 ].…”

Investigate the Effect of Recycled Aggregate and Mineral Admixtures on the Mechanical Properties and Performance of Concrete

“…According to experiments [30,31] performed on concrete samples consist of by completely swapping out the original aggregates for recycled aggregates that contained a mineral admixture of flay ash (FA), slag (BFS) and silica fume (SF), concrete properties can be developed to meet requirements with the right mineral selection and proportioning. Creating nano-materials have superior physical and mechanical properties have drawn attention to nanotechnology in cement research in recent years [32][33][34][35]. Various types of nanoparticles have been effectively used in concrete to enhance its mechanical properties and great durability.…”