Characterization of the mechanical properties of eco-friendly concrete made with untreated sea sand and seawater based on statistical analysis

Guo, Menghuan; Hu, Biao; Xing, Feng; Zhou, Xiaoqing; Sun, Meng; Sui, Lili; Zhou, Yingwu

doi:10.1016/j.conbuildmat.2019.117339

Cited by 141 publications

(34 citation statements)

References 38 publications

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“…To the best of the authors’ knowledge, very few investigations of the stress-strain behavior of SSC can be found in the existing publications, particularly the stress-strain behavior under different strain rate of loading. Guo et al (2020) reported that the presence of the seawater and sea-sand resulted in the decrease of both elastic modulus and peak strain of SSC, and the development trends of the two parameters were similar to those of ordinary concrete.…”

Section: Introductionmentioning

confidence: 68%

“…The reason why the seawater concrete has a higher early-age strength was explained from the blocking of pores by hydration products by Islam et al (2012), and the lower long-term strength was due to the leaching out of soft hydration products (Islam et al, 2012) and possible salt crystallization (Wegian, 2010). Guo et al (2020) concluded that the reduction of compressive strength of SSC was due to the acceleration of the hydration reaction at an early age which resulted in the formation of the porous microstructure. Additionally, the sea-sand concrete was found to have a similar elastic modulus to that of ordinary concrete (Limeir et al, 2012; Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on stress-strain curves of seawater sea-sand concrete under uniaxial compression with different strain rates

Zhang

2020

Advances in Structural Engineering

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In order to investigate the mechanical properties of seawater sea-sand concrete (SSC) under uniaxial compression, the SSC prisms with different mix proportions are designed and prepared, and the compressive strength and stress-strain curves under uniaxial compression are tested, in which five loading strain rates 10−5/s, 10−4/s, 10−3/s, 10−2/s, and 10−1/s are selected. The failure patterns of the SSC specimens under different strain rates are discussed, and the peak stress, peak strain (strain at the peak stress), elastic modulus, and ultimate strain are analyzed. The influence of the strain rate and the shell particle content on the stress-strain curves is intensively evaluated. It shows that the peak stress and elastic modulus increase with an increasing strain rate while the peak strain and ultimate strain have no obvious trend. Additionally, the shell particles seem to have contributions to the increase of the compressive strength of SSC base on the test results of cube and prism specimens, but further considerations about this phenomenon are necessary. Finally, the dynamic increase factor (DIF) of characteristic indices of SSC is put forward.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Experimental study on stress-strain curves of seawater sea-sand concrete under uniaxial compression with different strain rates

Zhang

2020

Advances in Structural Engineering

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“…Based on the statistical analysis, the compressive strength of SSC was found to decrease as a result of increasing chloride ion concentration in the mixing water. However, the replacement of conventional sand and freshwater for sea sand and seawater was found to not necessarily deteriorate the mechanical properties of concrete (Guo et al 2020). Younis et al (2018) also concluded that the use of sea sand and seawater in concrete did not affect the mechanical properties of concrete.…”

Section: Introductionmentioning

confidence: 98%

Properties and Application of Sea Sand in Sea Sand–Seawater Concrete

Dhondy

Remennikov

Sheikh

2020

J. Mater. Civ. Eng.

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Contradictory results have been published on the effect of sea sand and seawater in concrete as opposed to conventional river sand and freshwater. The majority of studies show equivalent, if not better, results when sea sand and seawater are used in concrete, although some studies concluded otherwise. This paper investigates the variations in the chemical and physical properties of sea sand. It has been found that each sea sand sample is unique, which might be the reason for the contradictory findings in the current literature. Chemical properties of sea sand were analyzed using a scanning electron microscope and the physical properties were observed using an optical microscope. The particle size distribution was measured. The short-term mechanical properties of sea sand-seawater concrete were compared with conventional concrete. The concrete samples were cured in natural marine conditions and atmospheric conditions and tested at 7 and 28 days. Sea sand-seawater concrete had a high early compressive strength at 7 days and remained slightly higher than conventional concrete at 28 days. The experimental procedure used all natural, unaltered, concrete constituents and curing conditions.

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“…The annul productions of ordinary Portland cement (OPC) and concrete are about 4 billion tonnes and 25 billion tonnes, respectively; and the production of concrete requires huge amounts of fresh water (Guo et al, 2020; Xiao et al, 2017). The World Meteorological Organization estimated that more than half of population worldwide will have difficulties to get enough freshwater (Nishida et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…But seawater sea-sand concrete (SSC) is attracting increasing attention worldwide as a novel and environment-friendly construction material that directly uses seawater and sea-sand without desalting (Guo et al, 2020; Li et al, 2016; Teng, 2014; Wang et al, 2018). The active ions (Cl - , SO 4 2- , Mg 2+ , and etc.)…”

Section: Introductionmentioning

confidence: 99%

Mechanism of strength evolution of seawater OPC pastes

Zhang

Sun

Zheng

et al. 2021

Advances in Structural Engineering

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This work investigated the strength degradation mechanisms of seawater ordinary Portland cement (OPC) pastes. Two types of specimens were prepared ((i) OSD sample (i.e. OPC was mixed with seawater, and then cured in deionized (DI) water) and (ii) ODD sample (i.e. OPC was mixed with DI water, and then cured in DI water, as the reference system)). The use of seawater in preparing OPC pastes effectively increased the hydration rate and early-age mechanical strength, but lowered the mechanical strength at the later age. The higher hydration degree and larger amounts of carbonates with a smaller crystal size enabled the seawater OPC pastes to exhibit a higher early-age mechanical strength, increasing by 13.0%–17.0% compared with the DI water OPC pastes. While the formation of Friedel’s salt and the formation of calcium-silicate-hydrate (C-S-H) gel with a lower polymerization degree and mean molecular chain length resulted in the deterioration of the pore structure and negatively affected the later-age strength development of the seawater OPC paste, decreasing by 5.8%–11.9% compared with the DI water OPC pastes.

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Characterization of the mechanical properties of eco-friendly concrete made with untreated sea sand and seawater based on statistical analysis

Cited by 141 publications

References 38 publications

Experimental study on stress-strain curves of seawater sea-sand concrete under uniaxial compression with different strain rates

Experimental study on stress-strain curves of seawater sea-sand concrete under uniaxial compression with different strain rates

Properties and Application of Sea Sand in Sea Sand–Seawater Concrete

Mechanism of strength evolution of seawater OPC pastes

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