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

Abstract

Abstract The interfacial shear strength (τi) 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 τi 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 τi, while WO and VCAS can mutually promote τi. However, τi 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.