Influence of the addition of 2%, 3% and 5% of fly ash on the physical-mechanical properties of cement mortar
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Date
2021-07
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Publisher
LACCEI Inc.
Abstract
The objective of this work was to evaluate the
influence of the addition of coal fly ash, a residue from the
manufacture of clay brick, in the manufacture of cement mortar; in
order to reuse construction waste in the creation of new materials,
reducing the cost of raw materials and contributing to the
environment. The standard cement mortar designed for a resistance
of 125 Kg / cm2 was compared with additions of 2%, 3% and 5% of
fly ash, in axial compression, absorption and capillarity tests. The
mortars with addition of 2% and 3% of fly ash reached the designed
strength but did not exceed the standard mortar, with strengths of
129.04 Kg / cm2 and 128.33 Kg / cm2 respectively, while the addition
of 5% reached 123.05 Kg / cm2. Capillarity with the addition of 2%
decreases 29.59% in relation to the standard mortar, at 3% it
increases 1.52% and at 5% it decreases 2.49%; the absorption in
the 2% addition varies with the standard by 0.29%, in the other
additions it increases. It is shown that the fly ash works as an
artificial pozzolana, favoring the physical-mechanical properties of
the hydraulic cement mortar, being viable its use in small additions.
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Keywords
Cement mortar, Fly ash, Resistance to axial compression, Absorption, Capillarity