Accelerator A

What is Accelerator A?

Accelerator A is a rapid set, early strength enhancing additive based on a novel, synergist blend of inorganic ultra-rapid set accelerators. When used as a rapid set accelerator in Portland cement systems, it provides rapid set times and high early strengths.

It is supplied as an off white, free flowing powder for blending into dry Postmix formulations. Postmix is a dry, pre-bagged blend of cement and aggregate that is mixed with water and used to set posts in the ground.

Where is Accelerator A used?

Accelerator A has been designed as a replacement for High Alumina cement (HAC) and Calcium Sulfo aluminate (CSA) cements in Postmix products, where rapid set times are required along with high early strength.

When HAC and CSA cements are used in Postmix, further additives are needed. Accelerator A does not need them. Simply add Accelerator A to the cement and aggregate package to provide rapid set and high early strengths.

Typical uses include:

• Rapid set Postmix for supporting posts and fencing
• Cold weather concreting, for which it is ideal
• Cost effective Postmix formulations with reduced cement contents

How to use Accelerator A

Dosage depends on the properties required, such as a set time between 5 and 10 minutes and enough early strength to support posts and fencing. It also varies with the OPC level in the formulation. Typical dosage rates are:

Cost effective Postmix formulations can be achieved with cement contents in the region of 120kg per tonne combined with Accelerator A at around 15kg.

These figures are a starting point only. Confirm the dose for your cement, aggregate and target set time with trials, and speak to our technical support team before going into production.

Health and safety

Refer to the Accelerator A Safety Data Sheet, available on request, for full instructions. Wear suitable PPE, including gloves and goggles, when handling.

Packaging, storage and shelf life

Accelerator A is supplied in 1000kg bulk bags. Store it in dry conditions and avoid contact with water. When stored correctly, it has a shelf life of 12 months from date of manufacture.

Accelerator A or Accelerator PMA?

Both are rapid set, high early strength additives for Postmix. Accelerator PMA is used at different typical dosage rates, so ask our technical team which suits your formulation. For precast and ready mixed concrete, see UKCP Rapid Set.

Developing a rapid set Postmix? Talk to our technical support team, or request a sample to run your own trials.