Rapid Set Post Mix Concrete 20kg

Rapid-setting post mix concrete for setting galvanised steel retaining wall posts. Just pour dry mix into the hole around the post, add water, and it sets in approximately 15–20 minutes — no mixing required. Ideal for DIY and tradie use.

• 20kg bag — suitable for one standard post setting (300–400mm diameter hole, 200mm depth of concrete)
• Sets in 15–20 minutes, full strength in 24 hours
• For deeper embedment or larger posts, use 2 bags per post
• Compatible with all steel H-beam and C-channel retaining wall posts
• Conforms to AS 3972 Type GP cement standard

Tip: Order approximately 1–2 bags per post depending on post diameter and embedment depth. A 10-post wall typically requires 10–20 bags.