Primary Binding Systems Utilizing Non-Pozzolanic Reactions of Coal Fly Ash

摘要

By introducing fly ash specific chemical activators to specialty high fly ash content concrete mixes, the rate of fly ash usage could grow dramatically, possible matching or exceeding the rate of growth seen for all CCPS in the past 10 years. Not only can the these chemically activated mixes become a part of an ever growing sector of the market such in fast setting concrete patching material and full depth concrete replacement, but these systems can actually grow or revive a declining market. Specifically, for the concrete pipe industry it is now within their means to produce a product with superior durability, specifically targeted for the corrosive environment found in sewer and waste treatment facilities. This not only provides an area of growth for fly ash within the existing concrete pipe industry, but also provides the pipe industry a means to compete against acid resistant plastic pipe that has been eroding the share of the market dedicated to concrete sewer pipe. By not relying on the classical cement hydration and pozzolanic reaction of fly ash to generate durable CSH binder, chemically activated fly ash can become the principal value added binder in a variety of cementitious products. This will lead to greater utilization of fly ash, reducing the volume and expense of fly ash disposal for CCP generators.