Effect of ground concrete waste as green binder on the micro-macro properties of eco-friendly metakaolin-based geopolymer mortar

Liu, Miao; Hu, Ruihan; Zhang, Youchao; Ma, Zhiming

doi:10.1016/j.jobe.2023.106191

Cited by 16 publications

(5 citation statements)

References 63 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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“…Scanning electron microscopy observation showed that SCA improved the bonding between PVC particles and cementitious materials, thereby improving the mechanical properties of the mortar. Liu recycled the ground concrete waste powder to prepare a green binder, and prepared a highly sustainable metakaolinbased polymer mortar [115]. Adding concrete waste powder into metakaolin can improve the dry shrinkage and compressive strength, but also affect the microstructure and the amount of the cement-based composite geopolymer slurry product.…”

Section: Performance Improvement and Practical Application Of Concret...mentioning

confidence: 99%

Advanced Composite Materials for Structure Strengthening and Resilience Improvement

Huang,

Su,

et al. 2023

Buildings

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Advanced composite materials have excellent performance and broad engineering application prospects, and have received widespread attention in recent years. Advanced composite materials can mainly be divided into fiber-reinforced composite materials, laminated composite materials, matrix composite materials, and other composite materials. This article provides a comprehensive overview of the types and characteristics of advanced composite materials, and provides a comprehensive evaluation of the latest research on structural strengthening and resilience improvement in advanced composite materials from the perspectives of new methods, modeling optimization, and practical applications. In the field of fiber-reinforced composite materials, the hybrid technology of carbon fiber and glass fiber can achieve dual advantages in combining the two materials. The maximum increase in mechanical properties of multilayer sandwich RH plate by hybrid technology is 435.4% (tensile strength), 149.2% (flexural strength), and 110.7~114.2% (shear strength), respectively. In the field of laminated composite materials, different mechanical properties of laminated composite materials can be obtained by changing the deposition sequence. In the field of matrix composites, nano copper oxide particles prepared by nanotechnology can increase the hardness and tensile strength of the metal matrix material by 77% and 78%, respectively. In the field of other composite materials, viscoelastic materials and magnetorheological variants have received widespread attention. The development of composite materials benefits from the promotion of new methods and technologies, but there are still problems such as complex preparation, high cost, and unstable performance. Considering the characteristics, application requirements, cost, complexity, and performance of different types of composite materials, further improvements and innovations are needed in modeling and optimization to better meet practical engineering needs, such as the application of advanced composite materials in civil engineering, ships, automobiles, batteries, and other fields.

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“…Traditional building materials such as ordinary Portland cement (OPC) are potentially harmful to energy consumption and the environment, and this has stimulated the sustainable development of the construction industry [1,2]. The development of sustainable and low-energy geopolymer technology for the reutilization of industrial wastes or by-products has attracted increasing attention in today's resource-constrained and critical environment [3][4][5][6][7][8][9][10][11][12][13][14]. Geopolymers fabricated in an alkaline solution and aluminosilicate materials fabricated by dissolution, reorientation, polycondensation, and polymerization reactions possess three-dimensional silico-aluminate frameworks where all the shared oxygen atoms are linked with SiO 4 and AlO 4 tetrahedra [15,16].…”

Section: Introductionmentioning

confidence: 99%

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

Zang,

Yao,

et al. 2024

Buildings

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Steel slag is an industrial by-product of the steelmaking process, which is under-utilized and of low value due to its characteristics. Alkali-activated technology offers the possibility of high utilization and increased value of steel slag. A geopolymer composition was composed of steel slag, fly ash, and calcium hydroxide. Four experimental groups utilizing steel slag to substitute fly ash are established based on varying replacement levels: 35%, 40%, 45%, and 50% by mass. The final samples were characterized by compressive strength tests, and Fourier-transform infrared spectroscopy measurements, thermogravimetric measurements, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, and mercury intrusion porosimetry were used to investigate the chemical composition and microstructure of the final products. Higher steel slag/fly ash ratios lead to a lower bulk density and lower compressive strength. The compressive strength ranges from 3.7 MPa to 5.6 MPa, and the bulk density ranges from 0.85 g/cm3 to 1.13 g/cm3. Microstructural and energy-dispersive X-ray spectroscopy analyses show that the final geopolymer products were a type of composite consisting of both calcium aluminate silicate hydrate and sodium aluminate silicate hydrate, with the unreacted crystalline phases acting as fillers.

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Effect of ground concrete waste as green binder on the micro-macro properties of eco-friendly metakaolin-based geopolymer mortar

Cited by 16 publications

References 63 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

Advanced Composite Materials for Structure Strengthening and Resilience Improvement

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

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