Failure of Roadway Subbase Induced by Overuse of Phosphogypsum

Ding, Jianwen; Shi, M.; Liu, Weizheng; Wan, Xing

doi:10.1061/(asce)cf.1943-5509.0001278

Cited by 23 publications

(10 citation statements)

References 13 publications

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“…erefore, the PGmodified mixtures used as road base materials in engineering practice cannot be immersed in water at the initial stage of curing, and if it rains during the construction, some covering measures must be taken [9,10]. e mass loss of PLFS-2 and PLFS-3 is 1.8% and 2.4%, which is as large as LFS (2.3%).…”

Section: Compressive Strengthmentioning

confidence: 99%

“…For lime-FA-PG binder which is usually applied as subbase material binder, the content of lime is generally 6%-12%, and the content of the ratio of PG and FA is usually controlled between 1 : 1-1 : 4 [2]. Meanwhile, the content of PG should not be very high because of the expansivity of ettringite [8][9][10]. However, most of these studies focused on the modification of PG for lime-FA binder or lime-FAstabilized soils.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Lime‐Fly Ash‐Crushed Stone with Phosphogypsum for Road Base

Zhang

Cheng

Lei

et al. 2020

Advances in Civil Engineering

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In order to increase the recycling of phosphogypsum waste, this study explored the feasibility of using phosphogypsum to replace some of the lime and aggregate in the lime-fly ash-crushed stone mixture which is a widely used road base material in China. For this purpose, compaction, compressive strength, composition structures, wetting-drying cycle tests, and shrinkage tests were carried out on the lime-fly ash-phosphogypsum-crushed stone composite to investigate its performance. The results indicate that lime-fly ash-crushed stone modified with phosphogypsum has the required strength of the road base material and favourable performances in environment (wetting-drying cycle) stability. The image processing analysis and shrinkage tests demonstrated that phosphogypsum can significantly improve the compactness and shrinkage performance of lime-fly ash-crushed stone mixture. A suitable content of phosphogypsum and a reasonable content of fine aggregate are conducive to improving the roadway engineering properties (i.e., decreasing shrinkage cracks and increasing compressive strength) of lime-fly ash-phosphogypsum-crushed stone composites.

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Section: Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of Lime‐Fly Ash‐Crushed Stone with Phosphogypsum for Road Base

Zhang

Cheng

Lei

et al. 2020

Advances in Civil Engineering

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“…Rashad (2017) and Zeng et al (2021) pointed out that ettringite produced by PG can effectively improve the strength of materials, but the volume of ettringite produced is greater than that of PG. Combined with field investigation and laboratory tests, Ding et al(2019) found that the amount of PG must be controlled within a reasonable range; otherwise, the PG-modified stabilized soil would swell. Li et al (2014) found that adding PG as an anti-cracking agent to the inorganic binder base layer can effectively reduce shrinkage caused by changes in temperature and humidity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Road Performance of High Content of Phosphogypsum in the Lime–Fly Ash Mixture

Qian

Zhong

et al. 2022

Front. Mater.

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Phosphogypsum (PG), as a by-product of the production of phosphoric acid, faces the problems of large annual output and difficult treatment. There is a large demand for fillers in the process of road paving, which may be an effective method for the utilization of PG resources. In this study, three proportions of phosphogypsum–lime–fly ash (PLF) mixture were designed, first, according to orthogonal tests. The comprehensive performance of the PLF mixture was tested by the compression rebound modulus test, unconfined compressive strength test, flexural tensile strength test, dry shrinkage test, and temperature shrinkage test, respectively. The results show that adding crushed stone to the PLF mixture can effectively improve the compression rebound modulus, unconfined compressive strength, and flexural tensile strength. The high content of PG in the mixture can also improve the dry shrinkage and temperature shrinkage properties of the mixture. According to the road layer requirements, the optimum proportion of the PLF mixture is recommended, which may benefit the road construction and PG resources.

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“…The annual global production of PG is approximately 100-280 million tons [2][3][4]. The rate of PG utilization is low compared to that of other industrial wastes, owing to the fact that phosphogypsum swells after absorbing water, and also contains dangerous elements [5]. Nevertheless, previous studies have shown that PG can be used in the manufacture of cement admixtures, mortars, sulphuric acid, soil improvers, and salts [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…To date, however, only a handful of studies have explored the use of PG in large-scale road engineering, mainly because large amounts of PG have poor effects on soil pressure resistance and water stability [27]. For example, Ding et al [5] reported that excessive use of PG in roads caused roadbeds and pavements to swell and form cracks. In addition, Tebogo et al [3] explored the properties of soils solidified with large amounts of PG and other wastes.…”

Section: Introductionmentioning

confidence: 99%

Development and Field Application of Phosphogypsum-Based Soil Subgrade Stabilizers

Yue¹,

Fang²,

Hua³

et al. 2022

Journal of Renewable Materials

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A phosphogypsum-based subgrade stabilizer (PBSS) was formulated using industrial by-product phosphogypsum (PG), mixed with slag and calcium-silicon-rich active material (GSR). The active powder (AP) was used to modify PBSS, and PBSS-AP was obtained. PBSS and PBSS-AP were each mixed with 10% silty soil, and cement and lime (CAL: 5% lime + 2% cement) were used as the traditional material for comparative experiments. Samples were cured under standard conditions, and tested for unconfined compressive strength (UCS), water stability, volume expansion, and leachate, to explore the stabilization effect of the three solidified materials on silty soil. The results showed that the comprehensive performance of sility soil mixed with 12% PBSS-AP was the best. The CaO, SiO 2 and Al 2 O 3 provided by PG, Slag and GSR will react with water to form a stable C-S-H gel, which is conducive to stabilizing the soil. Field application results showed that the compaction exceeded 95%, the deflection was 144.9 mm, and UCS was 2.5 MPa after 28 days. These findings indicated that PBSS-AP is an effective stabilizer for subgrade soils.

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Failure of Roadway Subbase Induced by Overuse of Phosphogypsum

Cited by 23 publications

References 13 publications

Modification of Lime‐Fly Ash‐Crushed Stone with Phosphogypsum for Road Base

Modification of Lime‐Fly Ash‐Crushed Stone with Phosphogypsum for Road Base

Experimental Study on the Road Performance of High Content of Phosphogypsum in the Lime–Fly Ash Mixture

Development and Field Application of Phosphogypsum-Based Soil Subgrade Stabilizers

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