Laboratory Research on the Application of Phosphogypsum as an Anti-Cracking Agent in a Cement-Treated Base

Li, Jia; Zhang, Yong; Mao, Lei; Zi, Jianmin; Hu, Tao

doi:10.1061/9780784413623.096

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…It has typically been used as a filler of pavement subgrade and to prepared modified asphalt [ 9 , 10 , 11 , 12 ]. Shen et al [ 13 ] prepared phosphogypsum-steel slag powder-flyash as a solidified material of pavement subgrade.…”

Section: Introductionmentioning

confidence: 99%

Effect of Phosphogypsum Based Filler on the Performance of Asphalt Mortar and Mixture

Wan

Han

et al. 2023

Materials

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This study introduced phosphogypsum coupled with steel slag powder to prepare the phosphogypsum based filler (PF) for asphalt mixture. Penetration, penetration index, softening point, ductility, equivalent softening point, moisture stability of asphalt mortars with different steel slag powder content, filler-asphalt ratio, and PF content were studied. Mechanical properties of PF based asphalt mortar (P-AM) were then analyzed to determine the optimum steel slag content in PF. Overall desirability method was used to determine the optimum replacement ratio of PF content in limestone filler. Rheological properties of P-AM were also analyzed through dynamic shear rheometer. Volumetric performance, high-temperature performance, low-temperature performance, and moisture stability tests were carried out on PF based AC-20 asphalt mixture. Results showed that P-AM presented the optimum performance when the content of steel slag powder was 23% by mass of phosphogypsum. Fatigue and rutting factor of asphalt mortar were enhanced by PF. The optimum PF content in replacing limestone filler was 75% through overall desirability evaluation. PF developed the high-temperature performance and moisture stability of asphalt mixture. Additionally, volumetric and low-temperature performance were not significantly affected by PF. It is suggested that using PF which is based on phosphogypsum as a filler of asphalt mixture to partially replace traditional limestone filler was adequate.

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Section: Introductionmentioning

confidence: 99%

Effect of Phosphogypsum Based Filler on the Performance of Asphalt Mortar and Mixture

Wan

Han

et al. 2023

Materials

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“…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. The content of PG in the anti-cracking agent was less than 7%.…”

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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“…They stated that this composite material could be engineered as road base material with competitive properties [28]. Li et al [29] used PG in the cement-treated base as an anti-cracking agent, and they found that PG could reduce the porosity and contraction space for temperature shrinkage and drying shrinkage of cement treated based. Another study using PG in adobe stabilization found that adding PG as a stabilization material reduces drying shrinkage and obtained the lowest value with 25% PG [30].…”

Section: Introductionmentioning

confidence: 99%

Utilization phosphogypsum as a construction material for road base: a case study in Vietnam

Ngo

Dang

et al. 2021

Innov. Infrastruct. Solut.

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Phosphogypsum (PG) is a by-product of the production of fertilizers from phosphate ores, and it contains some harmful substances to the environment. Thus, it is necessary to stabilize/solidify pollutants when using PG as a filling material. The purpose of this study is to investigate and verify the use of PG as a filling material for a road base through laboratory tests for a case study in Vietnam. In this study, PG incorporated with fly ash was stabilized with cement and lime. The specimens of these mixtures were then prepared and cured under wet and dry conditions. The mechanical properties of specimen were investigated through the unconfined compressive strength (UCS), California bearing ratio (CBR), and modulus of elasticity. The physical property of this stabilization was examined using scanning electron microscopy. A toxicity characteristic leaching procedure test was also conducted to assess environmental impact. The results showed that when PG was replaced partially by other materials such as cement, fly ash, lime, or sand, the maximum dry densities of specimens were increased, and their optimum moisture contents were decreased. The inclusion of 10% of FA and 10% of cement or 20% of FA, 5% of lime, and 5% of cement significantly enhanced the UCS of specimens using PG at the ages of 28 days. The compressive strength under the dry condition was higher than that under the wet condition. Additionally, all mixtures showed a higher modulus of elasticity and CBR value than the requirement of road base material. The utilization of original PG can be successfully used as raw material in stabilization for applying in the pavement layers of road construction. The obtained results in the present work showed that the physico-mechanical properties in terms of unconfined compressive strength, modulus of elasticity, CBR of PG specimens could satisfy the requirement for the subgrade, subbase, or base course of road construction even when the content of PG comes up to 90%.

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Laboratory Research on the Application of Phosphogypsum as an Anti-Cracking Agent in a Cement-Treated Base

Cited by 4 publications

References 12 publications

Effect of Phosphogypsum Based Filler on the Performance of Asphalt Mortar and Mixture

Effect of Phosphogypsum Based Filler on the Performance of Asphalt Mortar and Mixture

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

Utilization phosphogypsum as a construction material for road base: a case study in Vietnam

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