Compacted dune sand concrete for pavement applications

Khay, Saloua El Euch; Néji, Jamel; Loulizi, Amara

doi:10.1680/coma.900049

Cited by 21 publications

(9 citation statements)

References 3 publications

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“…Many parts in the world are located on cold zone with the long winter and large temperature difference between day and night. e freeze-thaw cycle was one of main factors, which can affect concrete durability [12]. Wang and Niu [13] investigated the effect of freeze-thaw cycles and sulfate corrosion resistance on mass loss rate and mechanical properties of shotcrete.…”

Section: Introductionmentioning

confidence: 99%

Frost Resistance of Desert Sand Concrete

Liu

et al. 2021

Advances in Civil Engineering

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Demand for medium sand has increased greatly with increasing infrastructure construction items. The shortage of construction sand resources has become a serious problem in many districts. It not only increases the engineering cost, and the overexploitation of river sand and mountain as medium sand also brings a series of serious environment problems. There are abundant desert sand (DS) resources in western China. If DS resources can be used to substitute medium sand to produce desert sand concrete (DSC), which was suitable for engineering practice, the environment can be improved and engineering cost can be reduced. Although many researchers had focused on the mechanical performance of DSC, there were few documents on the frost resistance of DSC. Frost resistance experiments of DSC with 50% desert sand replacement ratio (DSRR) and ordinary concrete (OC) were performed in this paper. Influence of freeze-thaw cycles on the mechanical properties of OC and DSC was analyzed. Experimental results showed that, with increasing freeze-thaw cycles, the damage, peak strain, and porosity increased, while elastic modulus, Poisson's ratio, and peak stress declined, the stress-strain curves tended to be flat. Under the same condition of freeze-thaw cycles, the frost resistance of DSC with 50% DSRR was higher than that of OC. Constitutive model of DSC after different freeze-thaw cycles was formulated. The results predicted by constitutive model agreed well with experimental results, which can provide technical support for DSC engineering practice.

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Section: Introductionmentioning

confidence: 99%

Frost Resistance of Desert Sand Concrete

Liu

et al. 2021

Advances in Civil Engineering

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“…Besides that, many studies have been carried out to investigate mechanical behaviors of DSC and mortar containing desert sand [1,[6][7][8][9][10][11][12][13][14][15]. Conclusions differed with each other since region of desert sand or experimental conditions were different.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the maximum value of decrease of strength values was less than 15%. The 20% desert sand (Algeria) and 20% crushed sand, 60% desert sand (Tunisia), and 40% crushed sand could provide a great compressive strength for self-compacting concrete and concrete for pavement applications [10,11], respectively. The highest compressive strength of concrete containing Mu Us desert sand decreased by only 3% compared to that of plain concrete [12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behaviors of Desert Sand Concrete (DSC) after Different Temperatures

et al. 2019

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In the building domain, the non-renewable resource of sand is widely used to produce concrete and mortar. The sand production has been estimated to be more than 10 billion tons with a total of 1.2 billion tons used in concrete in the last decade, which causes the gradual reduction of available building materials and impacts the environment. Since there are abundant desert sand resources in northwestern China, it would be viable to utilize desert sand as an alternative material for concrete production. In this study, an investigation of dynamic mechanical behaviors of desert sand concrete (DSC) was conducted. Various desert sand replacement ratios (0–100%) were used to replace the equivalent hill sand as fine aggregate. Experimental results showed that strain rate had a strong effect on the dynamic mechanical behaviors of DSC. The compressive strength (at room temperature) and flexural strength (after elevated temperature) increased with desert sand replacement ratio (DSRR) with the optimum replacement ratio of 40%, which was because the increase of DSRR improved the compaction of DSC. However, the effect of the low strength of desert sand was higher than that of the compaction when the DSSR exceeded 40%, so both strength values generally decreased with the increase of DSRR. Moreover, the dynamic constitutive model of DSC at room temperature was established on the basis of a nonlinear visco–elastic constitutive model (ZWT model), which can predict the stress–strain curves of DSC.

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“…Zhang et al [8] found that the addition of a proper amount of water-reducing agent can significantly improve the workability and mechanical properties of concrete made with aeolian sand from the Tengger Desert. Khay et al [9] determined the optimal mix ratio of compacted ASC by using some Sahara Desert sand to replace river sand, which broadened the source of materials that could be used for road concrete. Al-Harthy et al [10] concluded that use of the appropriate amount of aeolian sand in place of river sand for mixing concrete improved the workability of the concrete without affecting its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Time‐Varying Compressive Strength Model of Aeolian Sand Concrete considering the Harmful Pore Ratio Variation and Heterogeneous Nucleation Effect

Zhang

et al. 2019

Advances in Civil Engineering

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The aim of this study was to analyze the influence mechanism of aeolian sand on the mechanical property of concrete and establish the time-varying compressive strength model. Test studies on the development of concrete’s compressive strength with aeolian sand from the Mu Us Desert were carried out. Influence mechanism of aeolian sand on the strength of concrete was revealed by using the nuclear magnetic resonance (NMR) to analyze the pore ratio and structures of aeolian sand concrete (ASC) and using the X-ray single crystal diffraction (XRD) to calculate the relative contents of hydration products semiquantitatively. Results show that the strength first increases and then decreases with the increase of aeolian sand content, where 20% was the best replacement ratio. With less than 20% content, it promoted the strength by changing the pore structure of concrete and accelerating the cement hydration speed based on its filling effect and chemical activity; when the content was more than 20%, it led to a decrease of strength because of an increase of harmful pore ratio and a weakening of the interface transition zone (ITZ), where the stress concentration and damage when loading are easier to occur. At last, a time-varying compressive strength model of ASC considering the harmful pore ratio variation and heterogeneous nucleation effect was established based on the discussion, published date, and American Concrete Institute (ACI) model, which agrees well with the experimental results and can easily predict the strength of concrete.

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Compacted dune sand concrete for pavement applications

Cited by 21 publications

References 3 publications

Frost Resistance of Desert Sand Concrete

Frost Resistance of Desert Sand Concrete

Dynamic Mechanical Behaviors of Desert Sand Concrete (DSC) after Different Temperatures

Time‐Varying Compressive Strength Model of Aeolian Sand Concrete considering the Harmful Pore Ratio Variation and Heterogeneous Nucleation Effect

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