Abstract
The strength of concrete mostly depends on the strength and properties of coarse aggregate since the major volume of concrete was covered by coarse aggregate. The physical properties of coarse aggregates do grossly affect the workability and structural performance of concrete. This study considered the effects of physical properties of coarse aggregate on properties of concrete and the difference in strength of concrete made from four different types of coarse aggregates namely crushed basalt, crushed marble, river graver and surface gravel which were collected from different areas near to Nekemte town. For each types of collected coarse aggregate their physical properties are determined by performing necessary laboratory tests to attain the objective of the study. For proportioning of concrete making materials the ACI concrete mix design was followed. Total of 36 cubes and 12 beam molds were casted for determination of compressive strength flexural strength of C-25 concrete made from the four aggregate samples. The results indicate physical properties and types of coarse aggregate have effects on the strength of concrete. The four coarse aggregate samples have different physical properties and produced concrete having different compressive and flexural strength. Thus, it concludes, the compressive and flexural strength of concrete was greatly influenced by the physical properties and strength of coarse aggregate.
Highlights
Concrete is a heterogeneous material and strength by cement paste is not fully retained when sand and aggregate are added
River Gravel and surface gravel were collected from Bolo River and bolo area respectively which is 5Km from Nekemte town and River sand was purchased from an aggregates merchant on Hangar River
For this study physical properties of coarse aggregate were performed according to ASTM standards for each coarse aggregate type and Aggregate impact tests were in a American Journal of Engineering and Technology Management 2020; 5(5): 84-90 surface dry condition of aggregate and conducted in accordance with BS 812-112
Summary
Concrete is a heterogeneous material and strength by cement paste is not fully retained when sand and aggregate are added. Aggregates are most commonly known to be inert filler in concrete, the different properties of aggregate have a large impact on the strength, durability, workability, and economy of concrete. These different properties of aggregate allow designers and contractors the most flexibility to meet their design and construction requirements [17]. The shape and surface texture of natural aggregates and the density, porosity, in addition to shape and surface texture in artificial aggregates are attributed from the mode of production It is, very important to give a due consideration to the source and mode of production of aggregates. Aggregate properties significantly affect the workability of plastic concrete and the durability, strength, thermal properties, and density of hardened concrete [10]
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