Feature And Advantage

Additional Details

There are four main features, which give Ashtech’s Fly Ash its unique characteristics: Fine particle size – a large proportion of our Fly Ash is predominantly less than 45µm. The fine fly ash particles displace water between the cement particles and act as hydration sites for the cement, thereby improving the concretes pore structure and stimulating early strength development Spherical particle shape – The spherical particles of Ashtech’s Fly Ash improves workability when blended with cement particles. This property improves compaction and greater densities are achieved. In addition, the concrete is more cohesive and is less prone to segregation Low carbon content, expressed as LOI : In spite of major international codes allowing LOI (Loss on Ignition) contents up to 5%, Ashtech’s Fly Ash is processed with a minimum in-house limit of 2%. This tightening of the specification helps in delivering a more superior, more durable concrete Pozzolanic reaction – Due to the products' high pozzolanicity, Ashtech’s Fly Ash actively reacts with the free lime (non-durable calcium hydroxide) and converts it into Calcium Silicate Hydrates (CSH) which is the strongest, most durable paste fraction in concrete Advantages: With these unique features and characteristics, the use of Ashtech’s Fly Ash will have a number of performance benefits in concrete, both in the fresh and hardened state. These advantages can be summarized as follows: Reduced water content for a given workability or improved workability at the same water content The rate of bleeding is reduced while workability is increased Fresh mixes pump more easily and workability retention is more dependable Better off-shutter finish and aesthetics Improved long term strength and durability performance Lower shrinkage and porosity as a result of the lower water content Lower permeability and better resistance to chloride ingress and sulfate attack Lower heat of hydration in thick sections Reduced alkali silica reactivity