Torsional Strength of Reinforced Concrete Beams with Brine and Olive Oil Mill Wastewater

Abstract

The authors conducted a comprehensive research study on adding olive oil mill and brine wastewater to the concrete mix to investigate torsion, bending stress, shear, and compressive strength. The total number of specimens were 33 beams 100 mm (depth) × 100 mm (width) × 500 mm (length). Three beams were used as control samples, and thirty beams were divided into two groups: fifteen samples were from an olive oil mill, and the other fifteen were brine wastewater with different percentages of additive material (olive oil mill and brine wastewater), with 2.5, 5.0, 7.5, 10.0, and 15.0 % of each. The beams were reinforced with 4 ϕ 8 mm as longitudinal steel bars and ϕ 4 mm stirrups spaced at 20 mm. All specimens were tested at 28 days. It was found that the torsional strength of the samples containing brine wastewater when added at the best percentage, which is 10%, was 5.46 MPa. As is the case when adding olive oil mill wastewater with the best percentage, which is 7.5%, it was 5.16 MPa. These data are greater than the torsional strength in the reference samples, which were 4.38 MPa, meaning that the torsional strength when adding brine wastewater and olive oil mill wastewater increases by 24% and 17%, respectively. Doi: 10.28991/CEJ-2023-09-03-012 Full Text: PDF

Experimental investigations: Reinforced Concrete Beams Bending Strength with Brine Wastewater in Short Age

“…Comparing the results of this study with those of others [6][7][8][9][10] on the topic of compressive strength, we find that they are essentially identical, leading us to the conclusion that concrete to which brine wastewater has been added at a rate of up to 10% has a higher compressive strength than regular concrete.…”

“…However, the observed percentage boost in compressive strength drops below that of conventional concrete by around 3% once the brine wastewater addition rate exceeds 15%. Several studies [6][7][8][9] have confirmed the accuracy of this claim. Figure 12 and Table 8 show that the compressive stress curves for concrete aged with the addition of brine wastewater follow the same general pattern as those for conventionally aged concrete.…”

“…Specifications, Chemical, and physical parameters can be found in the previous studies [6][7][8][9].…”

“…According to the findings of the laboratory and prior research [6][7][8][9][10], it has been determined that the optimal proportion of brine wastewater that may be included in concrete and reinforced concrete to achieve optimal outcomes is 10%. Therefore, an investigation was conducted to examine the impact of brine wastewater on reinforcing steel in the context of a scarcity.…”

“…From an economic and environmental standpoint, waste creation and disposal is an issue of fundamental relevance for growth at the present moment, with direct consequences for sustainability [4][5][6]. To ensure that the concrete's resistance strength is not compromised, it is important to pay close attention to the ratios of its components while recycling materials into the material [7][8][9]. Previous research has shown this [10][11][12].…”