The roles of cenosphere in ultra-lightweight foamed geopolymer concrete (UFGC)

Shi, Jinyan; Liu, Yuanchun; Xu, Huijie; Gençel, Osman; Peng, Yiming; Yuan, Qiang; Gao, Julong

doi:10.1016/j.ceramint.2022.01.161

Cited by 60 publications

(13 citation statements)

References 50 publications

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“…It may exceed the ultimate shear stress of the geopolymer paste when the H 2 O 2 content is large enough. Consequently, some pores are crushed which are refilled by the geopolymer paste 32 . Therefore, the reduction in the growth rate of the total porosity in this stage is attributed to the crush of pore, which is resulted by the excessive shear stress at the interface with the geopolymer paste.…”

Section: Resultsmentioning

confidence: 99%

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Zhou

Xie

et al. 2023

Int J Applied Ceramic Tech

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Geopolymer foam has emerged as a promising inorganic porous material in the last decade. Despite of the numerous advantages, there are some pending issues to be addressed, on top of that is the low compressive strength. To overcome this, this study synthesizes a high‐strength geopolymer foam by the partial substitution of fly ash (FA) with ground granulated blast furnace slag and carries out an intensive investigation into its microstructure, pore properties, thermal conductivity as well as compressive behavior. The microstructure is firstly analyzed by X‐ray diffraction and Fourier transform infrared spectroscopy techniques. The pore characteristics are also scrutinized, including pore size distribution, total porosity and water absorption. Then, the thermal conductivity is investigated and the applicability of basic effective thermal conductivity models to characterize the relationship with total porosity is evaluated. Afterward, the compressive strength together with the softening coefficient is examined, and the relationship with total porosity is also studied. Finally, comparisons between the proposed geopolymer foam and other FA‐based geopolymer foams in the literature are performed. The results show that the proposed geopolymer foam possesses not only a comparable thermal conductivity but also a far superior compressive strength, which sheds light on the widespread applications in thermal insulation.

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Section: Resultsmentioning

confidence: 99%

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Zhou

Xie

et al. 2023

Int J Applied Ceramic Tech

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“…Rapid industrialization has caused many environmental problems [1,2], such as resource shortage, dramatic increase in carbon emissions, and solid waste accumulation. The popularization of the concept of carbon neutrality has promoted researchers in various fields to make efforts to solve the above problems.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Self-Compacting Rubberized Concrete with Different Rubber Types under Triaxial Compression

Meng¹,

Fu²,

Shen³

et al. 2023

Journal of Renewable Materials

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Different rubber aggregates lead to changes in the effect of stress conditions on the mechanical behavior of concrete, and studies on the triaxial properties of self-compacting rubber concrete (SCRC) are rare. In this study, 35 cylindrical specimens taking lateral stress and rubber type as variables were prepared to study the fresh properties and mechanical behaviors of SCRC under triaxial compression, where the rubber contains two types, i.e., 380 μm rubber powder and 1-4 mm rubber particles, and four contents, i.e., 10%, 20% and 30%. The test results demonstrated that SCRC exhibited a typical oblique shear failure mode under triaxial compression and had a more moderate descending branch compared with self-compacting concrete (SCC). The presence of lateral stress can significantly improve the compression properties, including initial elastic modulus, peak stress and peak strain, with an improvement range of 3%-73% for peak stress. While rubber aggregates mainly targeted the deformation abilities and toughness for improvement, and the peak strain improvement ranges were 0.1-3.1 times and 0.1-1.0 times for SCRC containing rubber powder and SCRC containing rubber particles, respectively, relative to SCC. At a high lateral stress of at least 12 MPa, the loss of strength due to the addition of rubber can be controlled within 10%, in which case the content of rubber powder and rubber particles was recommended to be at most 20% and 30%, respectively. Based on the Mohr-Coulomb theory, the failure criteria of SCRC with different rubber types were established. For analysis and design purposes, an empirical model was proposed to predict the stressstrain behavior under triaxial compression, considering the influence of different rubber content and lateral stress. The results obtained in this study can provide a valuable reference for the design and application of self-compacting rubberized concrete in practical projects, especially those involving three-way compression states and requiring high-quality deformation and energy dissipation. KEYWORDSSelf-compacting rubberized concrete; rubber types; triaxial mechanical properties; failure criterion; constitutive model Nomenclature SCRC Self-compacting rubberized concrete SCC Self-compacting concrete SCRC-A Self-compacting rubberized concrete containing rubber powder SCRC-B Self-compacting rubberized concrete containing rubber particles This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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“…Therefore, there is an urgent need to enhance the sustainability of the cement industry, so supplementary cementitious materials (SCMs) with hydraulic, filler or pozzolanic properties are used to partially replace cement. In the past, granulated blast-furnace slag (GBFS), limestone powder, fly ash (FA), etc., were used to replace cement, but due to their availability and production limitations, natural pozzolanic materials have been difficult to meet the growing demand for binders now [6][7][8][9][10]. Therefore, new SCMs need to be developed to replace cement.…”

Section: Introductionmentioning

confidence: 99%

Early-Age Properties Development of Recycled Glass Powder Blended Cement Paste: Strengths, Shrinkage, Nanoscale Characteristics, and Environmental Analysis

He¹,

Shen²,

Shi³

et al. 2023

Journal of Renewable Materials

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Recycling solid waste in cement-based materials cannot only ease its load on the natural environment but also reduce the carbon emissions of building materials. This study aims to investigate the effect of recycled glass powder (RGP) on the early-age mechanical properties and autogenous shrinkage of cement pastes, where cement is replaced by 10%, 20% and 30% of RGP. In addition, the microstructure and nano-mechanical properties of cement paste with different RGP content and water to binder (W/B) ratio were also evaluated using SEM, MIP and nanoindentation techniques. The results indicate that the early-age autogenous shrinkage decreases with the increase of RGP content and W/B ratio. While the mechanical strength deteriorates due to the addition of RGP, it can be compensated by reducing the W/B ratio. Although the addition of RGP increases the total porosity of the hardened paste, it reduces the small size porosity (<50 nm). In addition, the proportions of different types of C-S-H are changed, and the volume fraction of porosity is increased, but that of hydration products of cement paste is reduced due to the incorporation of RGP. Besides its pozzolanic activity, the mitigated shrinkage deformation that RGP is generating in cement pastes is encouraging for its use as a novel supplementary cementitious material that reduces the early-age cracking risk of cement-based materials. Meanwhile, the life cycle assessments indicate that the RGP-cement component is an economical and eco-friendly novel engineering material.

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The roles of cenosphere in ultra-lightweight foamed geopolymer concrete (UFGC)

Cited by 60 publications

References 50 publications

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Mechanical Properties of Self-Compacting Rubberized Concrete with Different Rubber Types under Triaxial Compression

Early-Age Properties Development of Recycled Glass Powder Blended Cement Paste: Strengths, Shrinkage, Nanoscale Characteristics, and Environmental Analysis

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