An overview of factors influencing the properties of concrete incorporating construction and demolition wastes

Ibrahim, Mohammed; Alimi, Wasiu; Assaggaf, Rida Alwi; Salami, Babatunde Abiodun; Oladapo, Ewebajo Adeoluwa

doi:10.1016/j.conbuildmat.2023.130307

Cited by 35 publications

(16 citation statements)

References 173 publications

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“…Consequently, Ca plays an important role in providing a significant portion of the compressive strength achieved in the RCP samples, which subsequently occurs through the formation of CSH. This is consistent with what earlier research has shown 81 , 82 . By substituting RCP for RBP in the 28-day B-12-1 brick sample with filler, the compressive strength enhances from 18.4 to 59.3 MPa, indicating a 220% growth.…”

Section: Resultssupporting

confidence: 94%

Facile fabrication of next-generation sustainable brick and mortar through geopolymerization of construction debris

Rahimpour,

Amini,

Sharifi

et al. 2024

Sci Rep

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Waste from construction and demolition (also known as CDW) is one of the most harmful environmental issues. This study's primary goal is to produce new mortar and brick materials from recycled concrete powder (RCP) and recycled brick powder (RBP), two of the most popular CDW. Geopolymeric mortar and brick samples were produced by passing RCP and RBP through sieve No. 50 (with sand filler if necessary) and combining them with an alkaline solution made of water glass (WG) and NaOH. In this study, the mixture was then cured for three days at 80 °C in an oven. The effects of filler, RBP amount, WG amount, and the concentration of NaOH alkaline solution on the samples’ strength were examined. Additionally, XRF and SEM/XRD tests were performed to verify the materials' composition and microstructure. The mechanical strength of the samples showed an increase with the increase of RCP values, so the brick sample with filler showed the highest compressive strength, measuring 59.53 MPa. The study's samples exhibited strong mechanical properties. Additionally, all of the bricks' water absorption fell within the standard range. In summary, according to different standards, both waste concrete and waste brick can be used to produce geopolymer materials especially bricks for construction and paving purposes.

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Section: Resultssupporting

confidence: 94%

Facile fabrication of next-generation sustainable brick and mortar through geopolymerization of construction debris

Rahimpour,

Amini,

Sharifi

et al. 2024

Sci Rep

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“…The shape and type of materials used in the drainage of the green roof and the substrate layer signi cantly affect the energy e ciency and water drainage ( Construction waste from construction sites of new buildings, demolitions, modernization of existing buildings or from road infrastructure constitutes approximately 32% of the total mass of waste in the world. Among them, the largest share is construction rubble: concrete and brick (Ibrahim 2023). Concrete dust (0-2mm), generated during the production of coarse aggregates, is also produced from recycling elements from large slab blocks.…”

Section: Introductionmentioning

confidence: 99%

Artificial lightweight aggregate made from alternative and waste raw materials, hardened using the hybrid method

Stempkowska,

Gawenda

2024

Preprint

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Lightweight aggregates are a material used in many industries. A huge amount of this material is used in construction and architecture. For the most part, lightweight construction aggregates are obtained from natural resources such as clay raw materials that have the ability to swell at high temperatures. Resources of these clays are limited and not available everywhere. Therefore, opportunities are being sought to produce lightweight artificial aggregates that have interesting performance characteristics due to their properties. For example, special preparation techniques can reduce or increase the water absorption of such an aggregate depending on the needs and application. The production of artificial lightweight aggregate using various types of waste materials is environmentally friendly as it reduces the depletion of natural resources. Therefore, this article proposes a method of obtaining artificial lightweight aggregate consolidated using two methods: drum and dynamic granulation. Hardening was achieved using combined methods: sintering and hydration, trying to maintain the highest possible porosity. Waste materials were used, such as dust from construction rubble and residues from the processing of PET bottles, as well as clay from the Bełchatów mine as a raw material accompanying the lignite overburden. High open porosity of the aggregates was achieved, above 30%, low apparent density of 1.23 g/cm3, low leachability of approximately 250 µS. The produced lightweight aggregates could ultimately be used in green roofs.

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“…The damage of functional gradient concrete mostly occurs at the interface bond, and the interface becomes a key factor affecting the splitting and tensile properties of functional gradient concrete. Ibrahim et al [14] pointed out that the main influencing factors of the bonding properties of new and old concrete are the interface treatment method and state, the type of interfacial agent, the bond strength of reinforced concrete, and the difference in deformation of new and old concrete. Yin and Liew [15] concluded that interfacial properties significantly affect both mechanical properties and damage modes of composites, and interface design has always been an important part of fiber-reinforced composites microstructure design research.…”

Section: Introductionmentioning

confidence: 99%

Splitting Tensile Test of ECC Functional Gradient Concrete with PVA Fiber Admixture

Xu,

Liu,

Zhang

et al. 2024

Coatings

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Engineered cementitious composite (ECC) functional gradient concrete has a promising application future, and its mechanical features are piquing the interest of researchers. The impacts of this strength class of concrete, interface reinforcement technique, ECC thickness (i.e., fiber dosage), and other factors on the splitting tensile strength qualities are explored using an experimental investigation of functional gradient concrete. The splitting tensile tests of 150 mm × 150 mm × 150 mm functional gradient concrete specimens were used to explore the link between concrete strength grade, interface reinforcing technique, and ECC thickness with polyvinyl alcohol (PVA) fiber additive and functional gradient concrete. The test results show that the splitting tensile strength of functional gradient concrete increases as the concrete strength grade increases; different interfacial treatments have a significant effect on the splitting tensile strength of functional gradient concrete; and the effect of ECC thickness change on the splitting tensile strength of functional gradient concrete shows different trends, which research can be used as an experimental reference for functional gradient concrete engineering applications.

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An overview of factors influencing the properties of concrete incorporating construction and demolition wastes

Cited by 35 publications

References 173 publications

Facile fabrication of next-generation sustainable brick and mortar through geopolymerization of construction debris

Facile fabrication of next-generation sustainable brick and mortar through geopolymerization of construction debris

Artificial lightweight aggregate made from alternative and waste raw materials, hardened using the hybrid method

Splitting Tensile Test of ECC Functional Gradient Concrete with PVA Fiber Admixture

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