Alabama’s humid, hot summers and occasional freeze-thaw cycles demand specialized concrete mixes. Lake Martin Concrete Company recommends five mix designs: 1) Air-entrained, 3500-psi mix for exposure to moisture; 2) Fiber-reinforced mixes for slab durability and crack control; 3) Slump-controlled mix for high-flow pump applications; 4) High-strength 4500-psi mix for structural walls and foundations; 5) Decorative overlays using fine cement and polymer additives. Each design includes appropriate admixtures—water reducers, accelerators, or... read full review »