Abstract
Solid wastes have been consumed to prepare cement-based materials, and the heavy metals are also solidified in matrix. However, the influence of soluble heavy metal on properties and hydration process is unclear in low water/binder cement-based composite (LW/B-CC). Fresh and hardened properties of UHPC (a typical LW/B-CC) are investigated after introduction of Mn2+, Pb2+, and CrO42-. Because of the declination of free water, addition of Mn and Pb leads to reduction of compressive strength in a low water/binder ratio, with the latter declining by 15.1 MPa and 10.3 MPa, respectively, after curing 80 d. Pb and Cr doped UHPC reduce the hydration degree by 6.6% and 3.6%, respectively, and the silicon tetrahedral chain complexity of C-S-H also decreases. Overall, this research clarifies the impact of three heavy metals on properties and hydration in LW/B-CC, which provides insights into recycling solid wastes, and solidifying heavy metals.
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