Abstract
Abstract In this work, the axial compressive strength at 3, 7 and 28 days of age and the tensile strength at 28 days of age of specimens of two self-compacting concrete (SCC) compositions were evaluated. The difference between them was the presence of the sugarcane bagasse ash (SCBA) in the substitution rate of 10% of the sand mass in the second trace. The traces were developed based on the rheological parameters of the NBR 15823 Brazilian standard. The strengths at 28 days were evaluated by the confidence interval of the Student’s t-test with α of 5%. The results in the fresh state have proved that the rheological performances between the SCC’S are similar. Moreover, the SCC with SCBA obtained equivalent performances in the compressive and tensile strengths at all ages when compared to the SCC without SCBA, with an effective reduction of 87 Kg of sand per cubic meter of concrete.
Highlights
The self-compacting concrete (SCC) is a category of concrete that is capable of flowing, self-compacting by its own weight, filling molds and passing through obstructions with success, quality and reliability
With the same data base and considering the same logic of calculation, it is estimated that the expected volume of 645,000,000 tons of sugarcane in the national harvest in 2017/2018 would be able to generate more than 4,000,000 tons of sugarcane bagasse ash (SCBA), if all the bagasse was used in processes of energy cogeneration
0,3 f 2/3 ck Minimum tensile strength (MPa) fctk,inf = 0,7 fct,m obtained by the SCC without SCBA and the SCCSCBA10, showed that both of them achieved the previous recommendation to be used in several structural applications following the standards of NBR 15823-1 annexes.[1]; 2
Summary
The self-compacting concrete (SCC) is a category of concrete that is capable of flowing, self-compacting by its own weight, filling molds and passing through obstructions (reinforcements, curves, inserts) with success, quality and reliability. The methodologies and techniques to obtain SCC are associated with challenges inherent to the rheological study in its fresh state, with a special focus on the control of the fluidity, cohesion and segregation resistance aspects To this end, these methodologies usually perform preliminary studies of the paste and/or the mortar, and of the granular structure of the aggregates and fine materials [3, 4, 5, 6]. According to CONAB [10], about 38.7 million tons of sugarcane are expected in the current harvest (2017/2018) only in the state of Paraná This volume can generate more than 240,000 tons of SCBA, based on the rate of ash generation by burning the bagasse reported in FIESP/CIESP [11]. The comparative mechanical evaluations were conducted on the performance results of the axial compressive strength at 3, 7 and 28 days and the tensile strength (diametral compression) at 28 days
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