The GPM with high NaOH concentration containing PC as additive
material gave good performances in the shear bond strength
prism test and bending stress of PCC notched beam test. The highest
shear bond strength of 24.2 MPa was obtained with 14 M NaOH
geopolymer with 10% Portland cement (14M10PC mix). The bending
stresses of PCC notched beams with filled GPM were enhanced
as expected. The GPM mix with 14 M NaOH and 10% PC gave excellent
bending stress of 3.1 MPa. However, with high NaOH concentration
(14 M) and high PC (15%), slight decreases in shear bond
strength and bending stress were observed. The performance of
GPM was found to be comparable to those of the commercial repair
materials. The average shear bond strength of RM was 17.9 MPa,
while that of GPM was slightly higher at 20.0 MPa.