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<p>Almost majority standards do not take aggregate characteristics into account when developing mixes, despite the fact that various studies have shown that aggregate features significantly affect the qualities of the concrete. The primary goal of this work is to investigate some aggregate qualities, such as sort and gradation, which still need to be studied. The effects of the kind and gradations of coarse aggregates (CAs) on the concrete’s compressive, splitting, and direct tensile strengths were investigated in this experiment using 27 different mixes. Additionally, three distinct CAs were performed on basalt, dolomite, and gravel. Three grading adjustments were made for each aggregate. The findings demonstrated that gravel mixes had the maximum fluidity and that the fluidity increased as aggregate particle size increased. Furthermore, it was demonstrated that the mechanical properties of the concrete improved with increasing aggregate size when the degree of the concrete was equivalent to or higher than 40&#xa0;MPa, irrespective of the kind of CAs utilized—gravel, basalt, or dolomite. For dolomite mixes that made from concrete degree of 40&#xa0;MPa and CAs of 15–20&#xa0;mm, the increases in compressive, splitting, and tensile strengths were 9%, 10%, and 4%, respectively; however, for dolomite mixes with concrete degree of 60&#xa0;MPa, the increases were 14%, 13%, and 7%, respectively. Crushed dolomite aggregates are advised because the results showed that, for all three concrete degrees (C25, C40, and C60) and CAs gradations (I, II, and III), the structural features of the concrete made from dolomite-mixes were greater than those of gravel/basalt mixes. Additionally, it is advised by designing mixture identification procedures to consider the type and effect of CAs as well as gradation. The splitting strength of the investigated mixtures was computed using formulas from the literature and the codes, and the findings of the experiments and theory agreed.</p>

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Effects of type and gradation of coarse aggregates on tensile strength of concrete with different grades: an experimental investigation

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Abdullah Albogami,
  • Sabry Fayed,
  • Mohamed Ghalla,
  • Mohamed E. Nawar,
  • Ahmed Badr el-din

摘要

Almost majority standards do not take aggregate characteristics into account when developing mixes, despite the fact that various studies have shown that aggregate features significantly affect the qualities of the concrete. The primary goal of this work is to investigate some aggregate qualities, such as sort and gradation, which still need to be studied. The effects of the kind and gradations of coarse aggregates (CAs) on the concrete’s compressive, splitting, and direct tensile strengths were investigated in this experiment using 27 different mixes. Additionally, three distinct CAs were performed on basalt, dolomite, and gravel. Three grading adjustments were made for each aggregate. The findings demonstrated that gravel mixes had the maximum fluidity and that the fluidity increased as aggregate particle size increased. Furthermore, it was demonstrated that the mechanical properties of the concrete improved with increasing aggregate size when the degree of the concrete was equivalent to or higher than 40 MPa, irrespective of the kind of CAs utilized—gravel, basalt, or dolomite. For dolomite mixes that made from concrete degree of 40 MPa and CAs of 15–20 mm, the increases in compressive, splitting, and tensile strengths were 9%, 10%, and 4%, respectively; however, for dolomite mixes with concrete degree of 60 MPa, the increases were 14%, 13%, and 7%, respectively. Crushed dolomite aggregates are advised because the results showed that, for all three concrete degrees (C25, C40, and C60) and CAs gradations (I, II, and III), the structural features of the concrete made from dolomite-mixes were greater than those of gravel/basalt mixes. Additionally, it is advised by designing mixture identification procedures to consider the type and effect of CAs as well as gradation. The splitting strength of the investigated mixtures was computed using formulas from the literature and the codes, and the findings of the experiments and theory agreed.