"Clinker Free Concrete Made
with Illinois Class F Fly Ash"
Northwestern University Center for Advanced Cement Based
Materials
The proposed research program involves three major tasks. The
first task involves developing a list of criteria that would be
required of the new products for use in industry. For example,
if the identified use of this material is in the concrete block
manufacturing section of the industry, then appropriate strength
and durability performance must be a consideration in the
ultimate project goals. The next task requires developing mix
designs that ultimately will produce a mortar or concrete
meeting the performance criteria set. This may involve testing
different water-to-binder ratios or the use of admixtures in the
mix. Also, a material combination must be chosen as well as the
mechanical treatment process to be used. Thus, many factors are
involved and an array of mixes will be employed to increase the
possibility that the most suitable mix will be found. Finally,
the mix designs will be used to cast mortars and concrete for
the testing program to be outlined in the proposal, which will
test the fresh and hardened properties of the material.
Expected results from the research include:
·
A mix or set of mixes that meet the performance
criteria set for the new products,
·
An optimal manufacturing process that can be used to
produce the new products in large quantities, and
·
A comprehensive evaluation of the overall performance
of the new products
Total Project: $
24,781
Board Commitment: $
24,781
Progress Report :This
research confirmed that materials derived from the blending of
cement kiln dust and fly ash can be made more reactive through
mechano-chemical activation. This process creates microdefects and
electrostatic charges on the particles, hereby increasing their
surface energy and chemical reactivity. The results from the testing
regimes showed that the material was cementitious and possessed
properties that would allow it to be used as a cement replacement in
concrete. These materials may provide the Illinois coal and cement
industries with a new product that will reduce their respective
waste materials and reduce the possibilities of environmental
hazards arising from the materials used. |
