A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on the properties of an excess-sulphate phosphogypsum slag cement stabilized base-course mixture containing phosphogypsum-based artificial aggregate
Graphical abstracts Display Omitted
Highlights: Ground PG improves volume stability and mechanical properties of ESPSC. PG-based binder and artificial aggregate were used to prepare the mixture. The ITZ between the ESPSC and the artificial aggregate was narrower. ESPSC increased the strength of the mixture containing artificial aggregate. The mixture containing ESPSC and artificial aggregate has better volume stability.
Abstract Phosphogypsum (PG) was used to produce an excess-sulfate phosphogypsum slag cement (ESPSC) and artificial aggregates and then co-utilized for road base mixtures to enhance their recycling efficiency. Their hydration process, strength development, volume stability, compatibility, etc., were investigated. The experimental results showed that the wet grinding process resulted in improved strength of the ESPSC mortar with finer ettringite hydrates. The base-course mixture prepared with ESPSC and artificial aggregate exhibited better volume and mechanical properties than that prepared with cement and artificial aggregate. In addition, it showed a narrower interfacial transition zone than that prepared with natural aggregate and ESPSC. The base-course mixture made of ESPSC and artificial aggregate containing 40 wt% PG showed a compressive strength higher than 3 MPa at 7 days, which met the highway base course specifications. This combination can significantly reduce material cost and improve the utilization of PG.
Study on the properties of an excess-sulphate phosphogypsum slag cement stabilized base-course mixture containing phosphogypsum-based artificial aggregate
Graphical abstracts Display Omitted
Highlights: Ground PG improves volume stability and mechanical properties of ESPSC. PG-based binder and artificial aggregate were used to prepare the mixture. The ITZ between the ESPSC and the artificial aggregate was narrower. ESPSC increased the strength of the mixture containing artificial aggregate. The mixture containing ESPSC and artificial aggregate has better volume stability.
Abstract Phosphogypsum (PG) was used to produce an excess-sulfate phosphogypsum slag cement (ESPSC) and artificial aggregates and then co-utilized for road base mixtures to enhance their recycling efficiency. Their hydration process, strength development, volume stability, compatibility, etc., were investigated. The experimental results showed that the wet grinding process resulted in improved strength of the ESPSC mortar with finer ettringite hydrates. The base-course mixture prepared with ESPSC and artificial aggregate exhibited better volume and mechanical properties than that prepared with cement and artificial aggregate. In addition, it showed a narrower interfacial transition zone than that prepared with natural aggregate and ESPSC. The base-course mixture made of ESPSC and artificial aggregate containing 40 wt% PG showed a compressive strength higher than 3 MPa at 7 days, which met the highway base course specifications. This combination can significantly reduce material cost and improve the utilization of PG.
Study on the properties of an excess-sulphate phosphogypsum slag cement stabilized base-course mixture containing phosphogypsum-based artificial aggregate
Liang, Yangshi (author) / Guan, Bin (author) / Cao, Tingwei (author) / Liu, Gang (author) / Tang, Pei (author) / He, Minghao (author) / Cheira, Mohamed Farid (author) / Rashad, Alaa M. (author)
2023-11-04
Article (Journal)
Electronic Resource
English
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