Abstract
ABSTRACT The use of self-compacting concrete in civil construction industry presents various advantages, since the material shows adequate workability during fresh state. When fiber reinforcement is used, there are changes in its behavior that require attention. This study aimed to evaluate the applicability of rheological tests and the correlation between its results and those obtained with regular tests used to control SCCs. In that sense, different mixtures of SCC with different steel fiber contents were produced in order to be analyzed in the experimental program described. Rotational rheology tests and slump flow and L-box tests were performed. The results showed that slump flow test did not present good correlations with rheological parameters. On the other hand, this test was able to point out the risk of segregation of the mixtures with higher fiber contents. A good correlation was obtained between the L-box test results and rheological parameters. The L-box was also able to show loss in the passing ability of SCC related to the rise of plastic viscosity and yield stress. These tests also presented a good correlation with the rheological parameters when lower fiber contents were used. Although the rheometry test was unable to evaluate these problems, this kind of test gave more objective and reliable data on variations in rheological parameters related to the increase of fiber content, and proved to be a more reliable test to this kind of application, especially when applied together with the conventional tests.
Highlights
The use of self-compacting concrete (SCC) brings important changes to the concrete casting process, by changing its behavior in fresh state
The results showed that slump flow test did not present good correlations with rheological parameters
The result of the Slump Flow showed little variation related to fiber content and classified all the mixtures as SCC according to the standard
Summary
The use of self-compacting concrete (SCC) brings important changes to the concrete casting process, by changing its behavior in fresh state. Aydin [2] indicates that SCC increases the efficiency of fiber reinforcement usage because it makes possible the usage of a higher fiber volume in fresh concrete maintaining its workability through fluidity improvement. That condition brings to the rheometer a higher capacity of evaluation, enabling its usage as physical criteria to comprehend the results obtained by the single point tests [14]. This experimental work was carried out aiming to evaluate the applicability of planetary rotational rheometry to evaluate the workability of steel fiber reinforced self-
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