I have made a sidewalk, and patio out of quickcrete and the forms that I bought several years ago... I live in an area that the ground does freeze, and we have plenty of rain in the spring, and fall... I need to know what to add to the grout/mortar in the sidewalk so when it freezes the walk wont be ruined. I can not put just sand in the joints, it will wash away.... ANY SUGGESTIONS would be welcome. the name of the forms that I used is walkmaker.