Influence of the addition of 2%, 3% and 5% of fly ash on the physical-mechanical properties of cement mortar

Zavaleta V.L.A.; Aliaga O.A. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2021) · DOI: 10.18687/laccei2021.1.1.142

Resumen

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 125Kg/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 129.04Kg/cm2 and 128.33Kg/cm2 respectively, while the addition of 5% reached 123.05Kg/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.

Instituciones: Universidad Privada del Norte