Study on axial compressive behavior and damage constitutive model of manufactured sand concrete based on fluidity optimization

Han, Zhao; Zhang, Yunsheng; Qiao, Hongxia; Feng, Qiong; Xue, Cuizhen; Shang, Minggang

doi:10.1016/j.conbuildmat.2022.128176

Cited by 15 publications

(4 citation statements)

References 15 publications

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“…Finally, the remaining water and superplasticizer were added to the mixture simultaneously and stirred quickly for 1 min. The slump of the fresh concrete was examined according to GB/T 50080-2016 [16]. The mixture was then placed in the molds and vibrationally compacted on a shaking table.…”

Section: Samples Preparationmentioning

confidence: 99%

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The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

Ren,

Hua,

Wang

et al. 2023

Mater. Res. Express

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The depletion of natural concrete aggregates, e.g., river sands, is a gradual process, and hence, manufactured sand concrete (MSC) is widely used in various construction projects. The flowability and high-temperature resistance of MSC directly determine the transport of fresh concrete and the fire resistance of high-rise buildings. In this study, MSC with different superplasticizer contents and sand ratios was prepared and its flowability and high-temperature resistance were studied. Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were used to characterize the microstructure and porosity of MSC. The flowability of MSC with higher than 0.75% superplasticizer content or lower than 43% sand ratio is suitable for super high-rise buildings according to GB/T 50081-2019. The mechanical properties of other MSC meet the C30 requirements except for the MSC with a sand ratio of 48%. And the relatively high superplasticizer content or low sand ratio can make the denser structure and lower porosity of MSC. In addition, the MSC with relatively high superplasticizer content and low sand ratio exhibits better resistance to high temperatures due to a denser structure. This study provides theoretical guidance for using MSC in high-rise buildings and studying fire performance.

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Section: Samples Preparationmentioning

confidence: 99%

“…Han et al found that the flowability of concrete would affect its compactness and the degree of initial defects. The degree of initial defects is closely related to the strength of concrete [16]. The sand ratio also affects the flowability and mechanical strength of concrete [17,18].…”

Section: Introductionmentioning

confidence: 99%

The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

Ren,

Hua,

Wang

et al. 2023

Mater. Res. Express

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“…Correlations between shape measurements and concrete performance are established, suggesting adjustments to the tarantula curve for enhanced accuracy. Han et al (2022) [23] explores the impact of M-sand on water reducer adsorption, commonly used to enhance concrete fluidity. Different grade strength levels (30 MPa to 80 MPa) of M-sand concrete are investigated using basic and optimized water reducer dosages.…”

Section: Literature Reviewmentioning

confidence: 99%

Inspection of the mechanical and durability behavior of concrete developed using M-sand

2023

IJATEE

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Growing global demand for river sand (R-sand), especially in India, is unsustainable, consuming 32-50 billion tonnes annually for concrete. This overuse threatens supply. R-sand extraction harms the environment and infrastructure. In response, M-Sand is a popular, consistent, and legal alternative. When using unwashed M-Sand, be aware of potential higher fines content, requiring more water for workability. Replacing R-sand with M-Sand enhances overall strength and performance of concrete. Manufacturing sand (M-Sand) also outperforms R-sand in terms of strength, with particle shape and texture less influential than stone powder (SP) and clay content. Choosing the right application can optimize M-Sand performance in concrete. *Author for correspondenceIn the realm of construction materials, the amalgamation of aggregates bound by cementitious paste has granted concrete unparalleled versatility, strength, and durability. This compels concrete to emerge as the paramount choice for construction endeavors [1,2]. The expanding urban landscapes worldwide have triggered a surge in construction activities, consequently driving the demand for cement to unprecedented heights. Projections made in 2016 forecasted a robust annual growth rate of 5.2%, catapulting the global cement market to an astounding 51.7 billion tons [3,4]. This escalating construction fervor has escalated the necessity for sand, a pivotal component in concrete manufacturing [5]. The conventional choice of natural R-sand as a fine aggregate has encountered challenges due to its depleting availability and soaring costs [6,7]. In response, manufactured sand has gained prominence as a promising alternative. Characterized by its finer particles that adeptly fill microscopic concrete pores,

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“…Concrete is one of the raw materials for infrastructure construction, and its consumption and demand are huge [3]. The collection of sand and gravel in concrete is mainly natural river sand [4]. As a non-renewable resource, the demand for natural river sand is in short supply due to massive exploitation.…”

Section: Introductionmentioning

confidence: 99%

Modification of Iron-Tailings Concrete with Biochar and Basalt Fiber for Sustainability

Chen

Song

et al. 2022

Sustainability

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Currently, less than 15% of waste iron tailings are utilized. Iron tailings can be used as fine aggregate in concrete, but this kind of concrete has no coarse aggregate, resulting in low strength. Additionally, iron tailings contain some heavy metals, which will cause environmental pollution if improperly treated. In this study, the mechanical properties, sulfate resistance, and pore structure distribution of basalt fiber-biochar-concrete (PFB) were studied. Where basalt is to enhance the mechanical properties of samples, and biochar is to adsorb heavy metals in iron tailings, to prepare environmentally friendly materials. Unconfined compressive strength (UCS) test, flexural strength (FS), sulfate immersion test, leaching behavior, and mercury intrusion porosimetry (MIP) test were used to study the performance of the samples, and X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), and scanning electron microscope (SEM) was used to characterize the samples, explaining the change mechanism of the macroscopic test. The results show that the compressive strength of PFB increased by 2.5% but the flexural strength increased by 12%. The basalt and biochar improve the pore size distribution of samples, that is, the pore size greater than 10 nm is reduced while the pore size between 2 and 6 nm is increased. Biochar can effectively adsorb heavy metals of Cu, Zn, Pb, and Cd, and their leaching concentration is reduced by 50–70%. Basalt fiber improves the mixing performance of concrete, while biochar with a small particle size fills the micro pores in concrete; this paper provides a new idea of sustainability for the preparation of environmentally friendly materials and the utilization of waste iron tailings.

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Study on axial compressive behavior and damage constitutive model of manufactured sand concrete based on fluidity optimization

Cited by 15 publications

References 15 publications

The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

Inspection of the mechanical and durability behavior of concrete developed using M-sand

Modification of Iron-Tailings Concrete with Biochar and Basalt Fiber for Sustainability

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