CEMIX FASTCRETE is a concrete designed exclusively for post hole applications, which require a fast setting time. It is a mixture of sands, aggregates, Portland cement and admixtures. When used in accordance with manufacturer’s recommendations, it attains a compressive strength of 15MPa after 28 days.
Used for applications including:
– Fence Posts
– Letter Box Posts
– Fast setting
– Easy to use – no mixing required
1. To prevent damage caused by ongoing ground water, apply CEMIX BITUPROOF PLUS to the posts (wooden and aluminium), prior to installation.
2. Dig a hole. Allow for 1/3 of the post to be underground.
3. Immediately prior to pouring the bag contents, pre-soak the hole to compensate for any drainage that might soak up the prescribed water. Line the hole with plastic if the soil is particularly sandy or porous.
Do not mix in a wheelbarrow or concrete mixer. See APPLICATION.
1. Pour clean water into the hole containing the post.
Bag contents to water ratio:
– 20kg: 1.9L to 3L
– 25kg: 2.5L to 3.75L
2. Immediately, but slowly and evenly, pour the bag contents into the hole around the post, at a rate of 30 to 45 seconds per bag. Do not empty the bag too quickly as this may lead to dry patches.
3. Prod the dry and wet contents with an up and down movement, using a thin timber or metal rod to ensure adequate water penetration is achieved. If necessary, top up with a small amount of water.
4. Position the post in the centre of hole. After a few minutes it will hold up on its own, allowing you to move to the next post. Do not disturb the post once it is upright.
DRYING & CURING TIMES:
After 15 minutes the hole can be filled with topsoil. After an hour the post will be able to withstand light work.
Note: If adding rails, only use a nail gun. Avoid using a hammer on posts for at least 3 days. In windy weather conditions, posts may need to be braced due to wind loading.
Clean tools with water immediately after use. If material becomes set on tools, remove using CEMIX CONCRETE DISSOLVER.
STORAGE & SHELF LIFE:
Up to 6 months when stored in the original, unopened packaging, in a dry place at 23°C and 50% relative humidity.
The data shown above reflects typical results based on laboratory testing under controlled conditions. Reasonable variations may occur on site.
CEMIX FASTCRETE is ideal for light duty, post hole work. For heavy duty, post hole work, use CEMIX SUPERSTRENGTH FASTCRETE. For applications requiring wheelbarrow mixed concrete with workability and longer set times, use CEMIX MULTICRETE or CEMIX MAXCRETE.
If your project requires Building Consent, please email email@example.com about the suitability of this product before use.