Use something like Quikrete construction-grade mortar mix (under $19 for 10 pounds at Walmart) and follow the manufacturer's instructions to set the bricks in place. You can also apply decorative ...
HIGH PERFORMANCE CEMENT FastSet Repair Mortar is a polymer-modified shrinkage compensated, rapid-setting, high-strength mortar formulation that sets in 20-40 minutes and can be sculpted to match ...