Effects of self-healing on the microstructure, transport, and electrical properties of 100% construction- and demolition-waste-based geopolymer composites

Ulugöl, Hüseyin; Günal, Muhammed Faruk; Yaman, İsmail; Yıldırım, Gürkan; Şahmaran, Mustafa

doi:10.1016/j.cemconcomp.2021.104081

Cited by 55 publications

(13 citation statements)

References 68 publications

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“…RAs from CDW have usually been focused on concrete road and pavement applications. Thus, it has been studied at the laboratory scale in pavements [ 9 ]; the manufacture of precast concrete blocks made with recycled mixed ceramic aggregates from CDW [ 10 ]; the feasibility of sustainable construction materials for concrete paving blocks [ 11 ]; concrete kerbs and floor blocks with RAs [ 12 ], concrete pavement flags [ 13 ]; unbound layers of pavements [ 14 ]; concrete paving blocks and flags made with crushed brick as aggregate [ 15 ]; concrete paving block production [ 16 ]; the transportation geotechnics sub-base evaluating the crushing characteristics of CDW [ 17 ], road base and sub-base [ 18 ]; CDW with Portland cement and hydrated lime as pavement subbase [ 19 ]; paving stone, kerb, and concrete pipes [ 20 , 21 ]; and the manufacture of geopolymeric concrete units [ 22 , 23 , 24 ]. In a previous study, the authors highlighted the importance of Priot; to use it is necessary to carry out a separation process of the CDW in order to ensure that the RAs have the necessary quality as substitutes of NAs, i.e., improvement of the properties of RAs through different mechanical treatments.…”

Section: Introductionmentioning

confidence: 99%

Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

et al. 2021

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Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from CDW, replacing natural aggregates (NAs) in the manufacture of precast concrete elements, such as kerbstones and paver blocks. The physical and technological properties of precast products formulated with RAs were analysed in accordance with current regulations, comparing them with those of commercial products manufactured with NAs. The results indicated that partial or total substitution of NAs by RAs increased the water absorption and apparent porosity values of the precast elements while reducing the bulk density and compressive strength. However, all units manufactured with RAs showed breaking load values higher than the minimum required by EN 1338 and, in some cases, slightly higher average tensile strength values than the reference material. In addition, some of the compositions including RAs gave rise to pieces that, according to their flexural strength, were classified as class 1 and marked S in accordance with EN 1340. According to abrasion resistance, in most cases, the precast elements are classified as Class 4 and I (≤20 mm). Finally, precast concrete produced from RAs satisfies the tolerance requirements for classification as class 3 (≤1.5 kg m−2). Therefore, it could be suitable for use in high pedestrian or traffic areas.

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Section: Introductionmentioning

confidence: 99%

Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

et al. 2021

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“…Ulugol et al 132 investigated self-healing performance using construction and demolition waste as an engineered geopolymer composite (EGC). The author explained that calcium and sodium in the construction and demolition waste and alkaline activators for EGC, including NaOH, Na 2 SiO 3 , and calcium hydroxide, are responsible for the self-healing process.…”

Section: Other Geopolymer Cementsmentioning

confidence: 99%

Toward Self-Healing Concrete Infrastructure: Review of Experiments and Simulations across Scales

et al. 2023

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Cement and concrete are vital materials used to construct durable habitats and infrastructure that withstand natural and human-caused disasters. Still, concrete cracking imposes enormous repair costs on societies, and excessive cement consumption for repairs contributes to climate change. Therefore, the need for more durable cementitious materials, such as those with self-healing capabilities, has become more urgent. In this review, we present the functioning mechanisms of five different strategies for implementing self-healing capability into cement based materials: (1) autogenous self-healing from ordinary portland cement and supplementary cementitious materials and geopolymers in which defects and cracks are repaired through intrinsic carbonation and crystallization; (2) autonomous self-healing by (a) biomineralization wherein bacteria within the cement produce carbonates, silicates, or phosphates to heal damage, (b) polymer–cement composites in which autonomous self-healing occurs both within the polymer and at the polymer–cement interface, and (c) fibers that inhibit crack propagation, thus allowing autogenous healing mechanisms to be more effective. In all cases, we discuss the self-healing agent and synthesize the state of knowledge on the self-healing mechanism(s). In this review article, the state of computational modeling across nano- to macroscales developed based on experimental data is presented for each self-healing approach. We conclude the review by noting that, although autogenous reactions help repair small cracks, the most fruitful opportunities lay within design strategies for additional components that can migrate into cracks and initiate chemistries that retard crack propagation and generate repair of the cement matrix.

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“…Fiber-reinforced high-performance concrete [2] (FRHPC) improves matrix uniformity and minimizes defects within the material by removing coarse aggregate to achieve high strength and durability. In recent years, the application of synthetic organic fibers represented by polyethylene fiber [3], polyvinyl alcohol fiber [4], and polypropylene fiber (PPF) [5,6] in HPC has made great progress. Considering that synthetic organic fibers can significantly improve structure's crack resistance, reduce the shrinkage crack [7], enhance the ductility [8], and affect the resistance of concrete [9], such fibers can effectively improve the wear resistance, impermeability, and tensile strength of FRHPC [10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Polypropylene-Fiber-Reinforced High-Performance Concrete Based on the Response Surface Method

Song

Zhang

et al. 2022

Advances in Materials Science and Engineering

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Polypropylene fibers are added to concrete to improve the toughness of the material. Manufactured sand and fly ash with high content are used to reduce the impact on the environment and cost. The response surface method (RSM) was used to design the test and study the mechanical and bending properties of polypropylene-fiber-reinforced high-performance concrete (PPFHPC). Three process variables, including the content of polypropylene fiber (1%, 1.5%, and 2%), content of fly ash (45%, 60%, and 75%), and water-binder (W/B) ratio (0.27, 0.3, and 0.33), were considered as factors. The compressive strength, flexural strength, flexural-compressive ratio, splitting tensile strength, and first-crack strength and bending strength of thin plate were evaluated. The prediction model established by the RSM showed the correlation and predictability between the response and the factors, and the corresponding relationship equation between the factors and the response was obtained. Results of multiobjective optimization indicated that the optimal three factors (content of PPF, FA, and W/B) were 2%, 62%, and 0.27. The established model can be used to predict the basic mechanical properties and bending properties of materials. This test laid a theoretical foundation for the development of PPFHPC materials.

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Effects of self-healing on the microstructure, transport, and electrical properties of 100% construction- and demolition-waste-based geopolymer composites

Cited by 55 publications

References 68 publications

Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

Toward Self-Healing Concrete Infrastructure: Review of Experiments and Simulations across Scales

Mechanical Properties of Polypropylene-Fiber-Reinforced High-Performance Concrete Based on the Response Surface Method

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