Experimental Investigation of MgAl-NO2 and MgAl-CO3 LDHs on Durability of Mortar and Concrete

Two kinds of layered double hydroxides (LDHs), MgAl-NO2 (N-LDH) and MgAl-CO3 (C-LDH), were incorporated to study the durability mortar concrete. The LDH contents 1%, 2%, 4% by mass concrete 0.5%, 4%, respectively. effect LDHs on sulfate resistance was studied through dry-wetting cycle test, compressive strength flexural test. In addition, effects pore structure, chloride resistance, carbonation shrinkage, creep investigated SEM, mercury injection XRD, ion diffusion coefficient salt corrosion depth shrinkage results showed that can improve ability resisting corrosion, carbonization, creep, reduce content, optimize structure some extent. Moreover, had a better improving compared 2% LDHs, C-LDH than N-LDH.