Construction and Demolition Waste as Recycled Aggregates in Alkali-Activated Concretes

Abdollahnejad, Zahra; Mastali, Mohammad; Falah, Mahroo; Luukkonen, Tero; Mazari, Mehran; Illikainen, Mirja

doi:10.3390/ma12234016

Cited by 42 publications

(16 citation statements)

References 110 publications

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“…A recent work by Galetakis and Soultana [15] reviewed the use of quarry fines in the preparation of building materials. Authors found that slurries can be used as fine aggregates or as cement replacement [25][26][27], while solid waste can, in part, substitute aggregates in concrete mixtures, as already proposed in literature for other wastes as well [28][29][30][31][32]. More recently, the possibility of including fine quarry wastes into new alkali-activated products has been investigated, similarly to what other researchers are doing as regards alkali-activated materials containing mine tailings (i.e., the finely ground residue from ore extraction) [33][34][35][36].…”

Section: Introductionmentioning

confidence: 95%

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

et al. 2020

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This review aims to provide a comprehensive assessment concerning alkali activation of natural stone wastes and minerals. In particular, the structure of the review is divided into two main sections in which the works dealing with alumino-silicate and carbonatic stones are discussed, respectively. Alumino-silicate stones are generally composed of quartz and feldspars, while carbonatic stones are mainly made of calcite and dolomite. The role of these minerals in the alkali activation process is discussed, attesting their influence in the development of the final product properties. In most of the works, authors use mineral additions only as fillers or aggregates and, in some cases, as a partial substitution of more traditional raw powders, such as metakaolin, fly ash, and granulated blast furnace slag. However, a few works in which alumino-silicate and carbonatic stone wastes are used as the main active components are discussed as well. Not only the raw materials, but also the entire alkali activation process and the curing conditions adopted in the literature studies here reviewed are systematically analyzed to improve the understanding of their effect on the physical, mechanical, and durability properties of the final products and to eventually foster the reuse of natural stone wastes for the purposes of sustainability in different applications.

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Section: Introductionmentioning

confidence: 95%

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

et al. 2020

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“…The Portland cement can be then completely replaced by AAMs in order to mix concrete [3,4]. Besides, some glass waste [5], construction and demolition waste [4,6] can be recycled as fine and coarse aggregates instead of natural aggregates. Eco-friendly green concrete is consequently obtained [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, some glass waste [5], construction and demolition waste [4,6] can be recycled as fine and coarse aggregates instead of natural aggregates. Eco-friendly green concrete is consequently obtained [4,5]. Moreover, it is well known that the ocean area is much larger than the mainland area on the earth.…”

Section: Introductionmentioning

confidence: 99%

“…Some minerals having aluminosilicates, such as ground granulated blast furnace slag, fly ash, metakaolin, et al, can be adopted in order to produce alkali-activated materials (AAMs) by using alkali-activators [ 2 ]. The Portland cement can be then completely replaced by AAMs in order to mix concrete [ 3 , 4 ]. Besides, some glass waste [ 5 ], construction and demolition waste [ 4 , 6 ] can be recycled as fine and coarse aggregates instead of natural aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Alkali-Resistant Glass Fiber Reinforced Coral Aggregate Concrete

Yang

Dong

et al. 2020

Materials

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The intention of this paper is to analyze the properties of coral aggregate concrete (CAC) that is reinforced by alkali-resistant glass fibers (ARGF) and the bond performance with BFRP (basalt fiber reinforced polymer) bars. Two types of ARGF, denoted by Type A and Type B with different manufacturing technologies and fiber lengths, are used in the test. Tests of compressive strength, splitting tensile strength, and flexural performance were performed on ARGF-CAC with four different contents for the two types of ARGF. It is found that the cubic compressive strength is slightly reduced when the fiber volume fraction exceeds 0.5%, but almost keeps invariable if the fiber content further increases. However, the tensile strength, residual strength retention and flexural toughness are improved as more ARGFs are added into CAC, and even higher with Type B ARGF addition. The optimized volume fraction is 1.5% for both the two types of ARGF based on the evaluation of the workability and mechanical performance. Moreover, central pull-out test was performed to study the bond properties of ARGF-CAC with BFRP bars. It is found that both the maximum average bond stress and residual frictional stress are generally reduced as the bond length is longer. The addition of Type B ARGFs can significantly improve the bond strength; however, the Type A ARGFs seem to have marginal effect.

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“…On the other hand, due to the large water absorption and weak bond strength with new matrix, the mortar attached on the aggregates was another factor which degraded the quality of recycled aggregates [ 17 ]. Both the micro-porosity in cement paste and the mesoporosity between particles increase the water absorption of RCA [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method

Chen

et al. 2020

Materials

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Mixed recycled aggregates (MRA) from construction and demolition waste (CDW) with high-purity and environmental performance are required for highway construction application in base layer and precast concrete curbs. The main problematic constituents that reduce the quality level of the recycled aggregates applications are brick components, flaky particles, and attached mortar, which make up a large proportion of CDW in some countries. This paper studies the potential of brick separation technology based on shape characteristics in order to increase the recycled concrete aggregates (RCA) purity for MRA quality improvement. MRA after purification was also processed with surface treatment experiment by rotating in a cylinder to improve the shape characteristics and to remove the attached mortar. The purity, strength property, densities, water absorption ratio, shape index, and mortar removal ratio of MRA were studied before and after the use of the brick separation and surface treatment proposed in this study. Finally, the recycled aggregates upgradation solution was adopted in a stationary recycling plant designed for a length of 113 km highway construction. The properties of CDW mixed concrete for precast curbs manufacturing were conducted. The results indicate that problematic fractions (brick components, particle shape, and surface weakness) in the MRA were significantly reduced by using brick separation and surface treatment solution. Above all, it is very important that the proposed brick separation method was verified to be practically adopted in CDW recycling plant for highway base layer construction and concrete curbs manufacturing at a low cost.

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Construction and Demolition Waste as Recycled Aggregates in Alkali-Activated Concretes

Cited by 42 publications

References 110 publications

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

Properties of Alkali-Resistant Glass Fiber Reinforced Coral Aggregate Concrete

Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method

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