| dc.description.abstract | Ultra-High Performance Concrete (UHPC) is the most significant evolution in recent
years of cementitious composites, and, due to its mechanical properties combined
with high durability compared to conventional concrete (CC), it becomes a structural
material with great potential use. Despite this promising potential, its mixing process
is sometimes complex to use more widely. In the quest to make the use of UHPC
more comprehensive, the UNISINOS dosing method was developed, which made the
process of mixing this composite simpler and more rational. However, some
parameters that influenced the search for the best mechanical properties of UHPC's
still needed to be defined. Thus, the objective of this research was to evaluate the
variation of the particle distribution modulus - q - with values of 0.20 and 0.25 and the
percentage of cement consumption (15%, 20% and 25%) in obtaining the lowest
indices marshaling deviation (IDE) of the method. The compressive and flexural
strength properties were evaluated regarding the variation of the two parameters, as
well as the workability of the mixtures through the spreading test. The compressive
strength results showed that the variation of the modulus q did not show changes in
this property, on the other hand, the cement percentage of 20% that generated the
lowest IDE's (190 and 180) obtained the highest compressive strength, 151.16 MPa
and 147.03 MPa, respectively at 91 days of normal curing. For the results obtained in
flexion, the modulus q was also not predominant for significant variations in the
values obtained, and as for the percentage of cement linked to the FDI, an inverse
correction to the compressive strength is evident, with the highest compression
results, showed the lowest values in flexion. Based on the results obtained, mainly
the compressive strengths at 28 and 91 days, it is possible to state that the
UNISINOS method of measurement is promising in the search for minimum
normative mechanical properties for UHPC. | en |
