Research on the performance of seawater sea-sand concrete: A review

Ge, Lincai; Feng, Zixian; Sayed, Usama; Li, Haitao

doi:10.1016/j.conbuildmat.2023.133921

Cited by 24 publications

(3 citation statements)

References 94 publications

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“…Some researchers have proposed the use of seawater and sea sand resources in the preparation of concrete [11][12][13], which would not only conform to the principle of achieving a shortened construction period by locally sourcing materials and saving construction costs [14], but would also save natural resources and solve the problem of ecological damage [15,16]. With a wide range of prospects for application and great advantages [17,18], this has become something of great significance for the development of the marine economy in China, as it can truly be taken from the sea and also used in it [19,20].…”

Section: Introductionmentioning

confidence: 99%

Study on the Damage of Fiber-Reinforced Seawater Sea Sand Concrete by Freezing and Thawing of Seawater

Sun,

Wang,

Xin

et al. 2024

Materials

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The use of seawater and sea sand as replacements for fresh water and river sand in the preparation of seawater and sea sand concrete can effectively address issues such as high transportation costs, extended construction periods, and resource wastage. Nevertheless, in northern coastal areas, the problem of concrete durability in the complex and changing marine environment is more prominent. Research on the durability of seawater sea sand concrete is beneficial to the widening of its application range. To investigate the impact of glass fiber (GF) and polyvinyl alcohol fiber (PVA) with different blending methods on the seawater freeze–thaw resistance of seawater sea sand concrete (SSC), corresponding specimens were prepared, and seawater freeze–thaw cycling tests were conducted. By adopting the slow-freezing method and combining macro-structure and micro-morphology, the damage mechanism and the deterioration law of fiber-reinforced SSC under seawater freezing and thawing were investigated. The results indicate that, macroscopically, the incorporation of GF and PVA can effectively mitigate the damage to the matrix and reduce the effects of external erosive substances on the rate of strength loss, the rate of mass loss, and the relative dynamic elastic modulus. After 75 cycles, the SSC with a total volume doping of 0.3% and a blending ratio of 1:1 showed a 41.23% and 27.55% reduction in mass loss and strength loss, respectively, and a 29.9% improvement in relative dynamic elastic modulus compared with the basic group. Microscopic analysis reveals that the combined effect of freezing and expansion forces, the expansive substances generated by seawater intrusion into the interior of the matrix, and salt crystallization all weaken the bond between aggregate and mortar, leading to accelerated deterioration of the concrete. The incorporation of fibers enables the matrix to become denser and improves its crack-resistant properties, resulting in a better durability than that of the basic group. The damage prediction model established by the NSGM(1,N) model of gray system theory exhibits high accuracy and is suitable for long-term prediction, accurately predicting the damage of seawater sea sand concrete under seawater freeze–thaw coupling.

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Section: Introductionmentioning

confidence: 99%

Study on the Damage of Fiber-Reinforced Seawater Sea Sand Concrete by Freezing and Thawing of Seawater

Sun,

Wang,

Xin

et al. 2024

Materials

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“…There has been explosive growth in the research of seawater sea sand concrete in recent years [1,7,8]. Some researchers [1,9,10] tested the compressive strength of sea sand concrete and found that sea sand has a positive or little effect on the short-term compressive strength of concrete.…”

Section: Introductionmentioning

confidence: 99%

“…The major reason for the high early strength is that chloride in seawater can affect the hydration process of cement and help form a denser and stronger microstructure [10,14]. Three recent reviews [1,7,8] on SSC found that a general consensus has been achieved among researchers that the early-age strength of SSC is higher and the long-term strength is similar to that of normal concrete. Current research on the durability of SSC found that the carbonization performance of SSC is even slightly better than that of normal concrete due to its denser microstructure [15].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Compression-Compacted Dry Concrete Paver Blocks Making Use of Sea Sand and Seawater

Guo,

Wang,

Liu

et al. 2023

Buildings

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Dry concrete is a kind of concrete whose fresh mixture has almost no flowability and is widely used in the production of small-size unreinforced compression-compacted concrete blocks in plants. Considering the shortage of natural river sand and freshwater for concrete production, this study proposes that sea sand and seawater can be directly used in the manufacture of compression-compacted dry concrete paver blocks. The idea was verified in the laboratory to find suitable mix proportions and forming pressure, which are two key parameters for the production of paver blocks. Furthermore, the effect of sea sand replacement ratio and seawater replacement ratio is investigated, where compression and flexural tensile tests were conducted on lab-made paver blocks at different ages. The experimental results reveal that both the compressive and flexural tensile strengths of paver blocks increased when sea sand and seawater were adopted. It is finally suggested that sea sand and seawater are suitable for the production of unreinforced paver blocks with enhanced mechanical performance.

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Seismic Capacity of Unstrengthened and FRP Strengthened Masonry Arches: Tilting Test and Nonlinear Numerical Analysis

Tarhan,

Savalle,

Uysal

et al. 2024

Earthq Engng Struct Dyn

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Cultural heritage preservation requires a deeper understanding of their seismic response and imposes the use of effective strengthening methods. Fibre‐reinforced polymers (FRP) have emerged as an effective solution for strengthening masonry structural elements. The decision over the optimal configuration for a FRP‐based strengthening is a trade‐off between different objective functions such as strength, inelastic stiffness and cost. Although some studies have explored design alternatives and topology optimisation, experimental investigation remains limited, especially regarding the evaluation of seismic response. This study investigates the seismic capacity of unstrengthened and strengthened mortared–masonry arches through tilting table experiments and numerical simulations. The optimal strengthening arrangement is obtained through topology optimisation, and experimental results demonstrate its performance. A three‐dimensional numerical model, following a macro‐modelling approach through the so‐called concrete damage plasticity material model, is adopted. Numerical results are validated with existing literature and experimental data. A parametric study is conducted for full‐scale arches to evaluate the effect of dimensions and the embrace angle of masonry arches. The study reveals that the numerical model successfully replicates masonry arches' nonlinear behaviour and hinge mechanism. In addition, both experimental and numerical results highlight the effectiveness of optimised strengthening placement achieved through topology optimisation.

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Research on the performance of seawater sea-sand concrete: A review

Cited by 24 publications

References 94 publications

Study on the Damage of Fiber-Reinforced Seawater Sea Sand Concrete by Freezing and Thawing of Seawater

Study on the Damage of Fiber-Reinforced Seawater Sea Sand Concrete by Freezing and Thawing of Seawater

Mechanical Behavior of Compression-Compacted Dry Concrete Paver Blocks Making Use of Sea Sand and Seawater

Seismic Capacity of Unstrengthened and FRP Strengthened Masonry Arches: Tilting Test and Nonlinear Numerical Analysis

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