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Experimental study on the shear strength of reinforced concrete beams cast with Lava lightweight aggregates

Nawaz W., Abdalla J. A., Hawileh R. A., Alajmani H. S., Abuzayed I. H., Ataya H., Mohamed H. A.

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 4

981--996

This paper investigates experimentally the shear strength behavior of reinforced concrete (RC) beams cast with Lava lightweight aggregates as a replacement of normal coarse aggregates. A total of 24 shear deficient RC beams were fabricated and cast with normal (NWC) and lightweight (LWC) concrete and tested under three-point bending after 28 and 56 days. The variables of the experimental program include type of aggregate, concrete compressive strength, and beam size. The experimental results include load–deflection response curves along with failure mode for each beam specimen. The experimental result showed that all beams failed in a similar fashion, due to diagonal tension shear crack. However, a larger number of cracks with less spacing occurred in the LWC beams as compared to NWC specimens. Based on the experimental results, it can be also concluded that LWC specimens tested after 56 days achieved comparable shear strength results to that of NWC beams. In addition, the strength reduction factor (l) for LWC specimens was in the range of 0.69–0.98. The concrete shear strength (Vc) was also predicted using different shear design provisions and the results has shown that Eurocode 2 provisions yielded the lowest C. O.V. of 2.3 and 10.2% for NWC and LWC specimens, respectively.

Performance of reinforced concrete beams cast with different percentages of GGBS replacement to cement

Hawileh R. A., Abdalla J. A., Fardmanesh F., Shahsana P., Khalili A.

Archives of Civil and Mechanical Engineering

2017

Vol. 17, no. 3

511--519

The aim of this paper is to study the effect of using Ground Granulated Blast Furnace Slag (GGBS) as a partial replacement to cement in reinforced concrete (RC) beams. A total of eight beams were cast with different percentages of GGBS replacement of 0%, 50%, 70%, and 90%, respectively. The performance of the tested specimens were evaluated and compared to that of a control beam without GGBS (0%). In addition, the concrete compressive and tensile strength of the different concrete mixes were evaluated and compared. Overall, test results indicated that the compressive and tensile strength of the different mixtures were quite similar. In addition, the performance of RC beams with GGBS replacement up to 70% is similar to that without GGBS. However, the stiffness and strength for the beam specimens with 90% GGBS were lower than that without GGBS by 16% and 6%, respectively. It was also concluded that the use of high percentage of GGBS up to 70% as a replacement to cement is practical and will not comprise the performance of RC beams. Furthermore, such replacement will contribute to the reduction in CO2 emission (carbon footprint) and therefore encourage the use of such sustainable and green concrete.