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Laboratory Study of Phosphogypsum, Stabilizers, and Tropical Soil Mixtures

2016; American Society of Civil Engineers; Volume: 29; Issue: 1 Linguagem: Inglês

10.1061/(asce)mt.1943-5533.0001711

1943-5533

Lilian Ribeiro de Rezende, Tallyta da Silva Curado, Millena Vasconcelos Silva, Márcia Maria dos Anjos Mascarenha, Daniel Arthur Nnang Metogo, Manoel Porfírio Cordão Neto, Liedi Légi Bariani Bernucci,

Concrete and Cement Materials Research

Phosphogypsum (PG) is a by-product of the phosphoric acid fertilizer industries that has possible applications in paving when stabilized with cement or lime. This study's aim is to compare the mechanical performance of the hemi-hydrate (HH) and dihydrate (DH) mixes with tropical soil, lime, and cement. The results of physical, mechanical, and mineralogical tests are presented, which demonstrate that the use of HH in cement and lime mixes reduces the swelling of this material compared to the use of DH; in addition, HH provides better mechanical behavior. These findings indicate that DH has limited application in pavement construction, but when converted into HH and mixed with tropical soil or chemical stabilizers, its alternative uses are possible, and more content (approximately 90%) of this material can be used.