Page 176 - Riem-Vol6_nº2

347 IBRACON Structures and Materials Journal • 2013 • vol. 6 • nº 2
E. POLESELLO | A. B. ROHDEN | D. C. C. DAL MOLIN | A. B. MASUERO
ue in the concrete prepared in the mixing plant, which also tends
to require higher concentrations of admixture as mixing times in-
creased. The total concentration of superplasticizer used until the
time limit of 6 hours in both test settings fell within the limits speci-
fied by the manufacturer for this addition (between 0.2% to 1.0%).
4. Conclusions
The results for the tests with ready-mixed concrete and in laboratory
conditions indicate that, for the methods and materials in this test,
it is possible to use concrete that has been mixed for periods that
Figure 8 – Slump and increase in slump by the addition of the superplasticizer
for concrete produced in the ready-mixed concrete plant, during the 6 hours of mixing
Figure 9 – Percentages of admixtures used in concrete produced in the laboratory
Figure 10 – Percentages of admixtures used in concrete produced in the ready-mixed concrete plant