Abstract
Various concretes have been developed to meet the principles of sustainability. High volume fly ash-self compacting concrete (HVFA-SCC) is one example. The utilization of HVFA-SCC for structural applications, however, raises a concern among designers: that HVFA-SCC may not be as strong as conventional concrete when carrying shear forces. This concern is related to slow strength development and relatively smoother crack surface formation in HVFA-SCC, which, consequently, reduces the aggregate interlock mechanism contribution to the shear strength. In this respect, the design code for estimating the shear strength of HVFA-SCC may not be valid for the reason that the code was developed on the basis of the conventional concrete database. Previous research on the shear strength of HVFA-SCC was limited and no database can be extracted to justify the validity of the shear design code. This research was conducted to clarify the suitability of shear design code for HVFA-SCC. The research began with a limited laboratory investigation, followed by a numerical investigation to expand the range of results. Two types of HVFA-SCC beams with dimensions of 100 mm × 150 mm × 1700 mm were prepared, utilizing 50% and 60% fly ash. The shear behavior obtained from the laboratory investigations was then numerically modeled with the help of 3D ATENA Engineering software. The numerical model was used to explore the influence of reinforcement ratio, shear span to beam effective depth ratio, and beam size on the shear strength of the HVFA-SCC beam. The results were compared with the shear strength database of conventional and unconventional concrete beams to judge if the provisions in the design code can be applied to the shear design of an HVFA-SCC beam. The results confirm that the ACI shear design code is applicable for HVFA-SCC.
Highlights
HVFA-SCC is a type of concrete that combines high volume fly ash (HVFA) and self-compacting concrete (SCC)
HVFA concrete is defined as concrete that uses fly ash as a supplementary cementitious material to replace cement, where the replacement level is at least 50% by the weight of cement
In a study conducted by Bouzoubad and Lachemi [10], it was shown that HVFA-SCC could be designed by replacing 60% cement with class F fly ash
Summary
HVFA-SCC is a type of concrete that combines high volume fly ash (HVFA) and self-compacting concrete (SCC). Arezoumandi et al [15] conducted an experimental study on the shear strength of a full-scale beam constructed with two different fly ash contents (50% and 70% by weight) and compared the results with conventional concrete (CC). A total of 12 tests were carried out without stirrups and with three different ratios of longitudinal reinforcement They concluded that HVFAC beams have shear strengths comparable to CC beams. With respect to HVFA-SCC, the results shown by previous research are promising; this concrete has adequate shear strength This implies that the code provisions that were developed for the conventional beam shear design can be used as an approach in the HVFA-SCC beam shear design.
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