Effects of bauxite tailings and sodium silicate on mechanical properties and hydration mechanism of magnesium phosphate cement

Ruan, Wenqiang; Liao, Jianguo; Gu, Xinqi; Mo, Jiajia; Cai, Mingzhong; Guo, Wei; Li, Fengheng; Zhu, Yu; Ma, Xiaoe

doi:10.1016/j.conbuildmat.2022.130055

Cited by 13 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main reason for this is that the hydration reaction of SMN promotes the formation of a large amount of cementitious material, which plays a role in stabilizing CPG and RCA, further reducing the number of internal voids for lowered water erosion damage. These results are in compliance with the findings of Ruan et al [34], combining bauxite tailings and sodium silicate to fully solidify the magnesium phosphate cement, which produces zeolitelike hydration product sodium silicate aluminate hydrate and makes the structure more compact while effectively reducing cracking. this is that the hydration reaction of SMN promotes the formation of a large amount of cementitious material, which plays a role in stabilizing CPG and RCA, further reducing the number of internal voids for lowered water erosion damage.…”

Section: Frost Resistancesupporting

confidence: 92%

Performance Improvement and Microstructure Characterization of Cement-Stabilized Roadbase Materials Containing Phosphogypsum/Recycled Concrete Aggregate

Wu,

Bian,

Liu

et al. 2023

Materials

View full text Add to dashboard Cite

The proper reutilization of the phosphogypsum (PG) by-product derived from the production of phosphoric acid and recycled concrete aggregate (RCA) from waste concrete in roadbase materials is of great necessity and importance. This investigation tried seeking a new approach to reuse them to high quality, including turning PG into calcinated PG (CPG) via washing and calcination, as well as adopting sodium metasilicate nonahydrate (SMN) to strengthen the roadbase materials of cement-stabilized CPG and RCA. Upon the mix design, with a series of experiments including unconfined compressive strength, the wet–dry cycle, freeze–thaw cycle, and scanning electron microscopy, the comprehensive effects of PG treatment, the CPG to RCA mix ratio, SMN dosage, wet–dry cycle and freeze–thaw cycle on the road performance of roadbase materials were well evaluated, and the traffic bearing capacity and microstructure characteristics were also analyzed. The results demonstrate that the 7 d unconfined compressive strength of CPG/RCA roadbase materials can reach 5.34 MPa as the CPG and SMN dosage are 20% and 11%, respectively, which meets the requirements of an extremely and very heavy traffic grade. After five wet–dry cycles and freeze–thaw cycles, the resistance of the CPG/RCA roadbase materials to moisture and frost was significantly improved as 11% SMN was added. Meanwhile, SMN contributes to the reduction in crack width and densifies the microstructure of CPG/RCA roadbase materials. The research results can be used to provide new guidance for building more durable roadbase materials.

show abstract

Section: Frost Resistancesupporting

confidence: 92%