Study on effect of modified silica sol on the mechanical properties and application of foamy concrete
Silane coupling agent KH560 was used as silica sol modifier to study the effect of the mass incorporated into modified silica sol and unmodified silica sol on the folding strength,compressive strength,thermal conductivity,and load sink values of foamy concrete at 7d and 28d,respectively,and on the over road bridge segment.The experimental results show that KH560 can significantly reduce the agglomeration degree of the silica sol,reduce the average size of the nano silica sol,and elevate the surface activity of the nano silica sol.When a modified silica sol with mass fraction of 3%was added to foamy concrete,the mechanical properties and thermal insulation of foamy concrete reached the optimum,at which point the folding resistance and compressive strength of foamy concrete over a 28d period were 13.7MPa,57.9MPa and the thermal conductivity of foamy concrete over a 28d period were 0.24W·(m·K)-1,while it had practical use in the overroad bridge segment.
NETL
NSTL
万方数据
