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The interfacial shear strength ( τ  i ) between magnesium phosphate ceramics (MPC) and sugar maple ( Acer saccharum ) has been evaluated by means of a pullout test method. The binder system monopotassium phosphate (MKP) and magnesium oxide (MgO) resulted in the highest  τ  i  at a MKP/MgO ratio of 3:1. The influence of the levels of MPC binder and aggregates on the interfacial properties has been observed based on a mixture design model. The aggregates were Portland cement (PC), wollastonite (WO), and vitrified calcium aluminosilicates (VCAS). The MPC binder level was the primary factor influencing  τ  i , while WO and VCAS can mutually promote  τ  i . However,  τ  i  is decreased when PC is mixed with the two other aggregates. The environmental durability of VCAS-based MPC (V-MPC), PC-based MPC (C-MPC), and WO-based MPC (W-MPC) was assessed by treatments at conditioning (90% relative humidity) and water immersion. The V-MPC/maple has very poor moisture performance, while the C-MPC/maple and W-MPC/maple had reduced interfacial shear stresses but still maintained bond integrity unlike the V-MPC.

Interfacial properties of magnesium phosphate ceramics and sugar maple ( Acer saccharum )