Abstract
There are two most popular approaches to determining the compressive strength of concrete: testing cubes, testing cylinders. The use of different samples gives different results, which are intended to characterize one parameter of the material compressive strength. The article discusses a general approach to determining the compressive strength of cylinders and cubes. The analysis of the factors influencing the transition coefficients when testing the cylinder samples with the ratio of height to diameter is less than 2. The results of testing cubes and cylinders for compression made of fiber-reinforced concrete are presented.
Highlights
The analysis of the results obtained allowed us to draw the following conclusions. - The relationship between the strengths of the cylinder and the cube depends on the strength of the material. - The transition coefficient from the compressive strength of a cube to the compressive strength of a cylinder is influenced by the strength of fiber-reinforced concrete, the ratio of the height of the sample-cylinder to its diameter, and the type of coarse aggregate
- A height to diameter ratio of 2 gives the best results. - The closest values of the compressive strength of different samples were obtained in composition B, which refers to fiber-reinforced concrete of medium strength. - Fiber reinforcement at the dosage used has no effect on the compressive strength of the cubes and only slightly affects the compressive strength of the cylinders at the same height to diameter ratios. - Fiber reinforcement has little effect on the compressive strength of the cubes. - When testing the compression of fiber-reinforced concrete specimens, the homogeneity of the fiber-concrete mixture should be taken into account, especially when combinations of movable concrete matrices with metal fiber fibers, which tend to settle
It is planned to conduct a study of the orientation of fiber fibers in samples with different aspect ratios
Summary
Compressive strength is one of the main quality indicators of building materials such as concrete and fiber-reinforced concrete. This parameter is obtained - the fracture stress related to the cross-sectional area of the test specimen. The aspect ratio significantly affects the results of compression tests of brittle materials such as concrete, fiber-reinforced concrete, foam concrete. It was found experimentally [12] that the ultimate load increases as the aspect ratio decreases, and attempts to bring it to the standard ratio become more complicated when the material strength level changes
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