Bemix High Tech 310

Preparation:
The concrete substrate must be clean and free of dust, damaged concrete, grease or other contaminants that may impair adhesion. Substrate with a roughened and raw surface with closely spaced irregularities provide better adhesion. Clean the substrate carefully and if possible pre-water 24 hours before casting. Remove surface water immediately before casting.

Mixing:
Do not mix by hand. The best mixer is a rapid mixer type Rojo 50, automatic mixer or pan mixer. For smaller quantities, mixing with a drill and mixer attachment works well. Mix to an even and clump-free consistency. Always pour in the water first. Use a graduated mixing vessel and ensure that the temperature of the mix is 20 °C. The mixed concrete must be used within 20 minutes. For jointing in minus degrees, use Bemix High Tech 310 FF.

Application advice:
The mortar is applied manually and carefully packed or can also be pumped with a purpose-designed concrete pump. Ensure that joints and underpourings are always completely filled so as to avoid cavities.

Reinforcement:
Joints over 20 mm layer thickness need to be reinforced with the prescribed covering layer.

After treatment:
Semi-hardened material can be adjusted with a trowel. Free and unprotected surfaces are protected immediately after casting so that shrinkage and dehydration cracks do not occur. After casting, the surface can be moisture-cured with a thin, light mist of water, but that cannot mechanically damage the mortar. At air temperatures above 5°C, curing may take place with remaining form, covering or supply of water and may last the entire first week. As soon as the surface hardens, it can be watered and
covered.

Anchorage:
The work must be carried out according to EN 1504-10 and the surface structure and cleanliness of surfaces in anchoring holes
and slots must comply with 7.2.2, 7.2.3
and 7.2.5 and shall be suitable for the anchoring material.
Drilling is done at an angle to the surface, including for vertical surfaces. The drill hole should be the diameter of the item to be
embedded plus 10 mm and the drill used must meet the requirements according to 1504-10 and also EN 1881 and create a surface roughness of
the concrete substrate. When a hole has been drilled, it is cleaned out with compressed air and finally carefully plugged
before the next hole is drilled. The drill hole is filled with water at least 24 hours before installation. Clean out the hole with
compressed air immediately before installation. There must be no free water in the hole before installation. After the hole has been
blown clean, installation must be done immediately. The bolt to be embedded must be free of loose rust, oil, grease or other
contaminants.

Installation:
The concrete is injected into the drill hole with a Bemix concrete pump or manually with a Bemix concrete injector. For installation in sub-zero temperatures use Bemix High Tech 310 FF. The bolt is then pushed carefully down into the hole with a backwards and forwards motion so that air bubbles are pressed out of the concrete. The entire hole must be full of concrete after the bolt has been installed. The bolt is held in place for support. The support must not be allowed to get stuck.

After curing:
When after treatment is done protect free surfaces from drying out. Apply a water mist and protect with plastic sheeting. Keep damp for the whole first week. The support can be dismantled the day after casting.