Properties and application of lithium slag-based aluminasilicate artificial aggregates
Lepidolite lithium slag-based aluminasilicate artificial aggregates,with a cylinder compressive strength of up to 10 MPa and a stacking density of 1000 kg/m3,were prepared by artificial granulation and autoclaved method.The aggregate consists of lepidolite lithium slag(LS),Portlandite cement(PC),ground granulated blast furnace slag(GGBS)and steel slag(SS),in which LS ac-counted for 70％～80％.The study concentrates on hydration products of artificial aggregates and application technique in concrete.The results revealed that:with the same incorporation of LS,the substitution of cement by SS or GGBS can significantly enhance the cylinder compressive strength of the artificial aggregates.Moreover,the main hydration products in the PC-LS aggregates were i-dentified as tobermorite and katoite.Anhydrite was predominantly found in flakes or short columnar.While,SS-GGBS-LS aggregates exhibit lower Ca/Si ratio,with tobermorite being the main hydration product.Anhydrite appeared mostly in needle or rod-like forms.Furthermore,incorporating 80～120 kg/m3 of LS-based artificial aggregates in concrete had proven to enhance concrete construction properties and improve the long-term mechanical properties of the concrete.
万方数据
维普
