Abstract
Depending on the dimensions of concrete elements, aggregates of different grain sizes are used for the building structures. Taking this fact into account, the authors of the paper have undertaken in their work an issue concerning the analysis of the influence of maximum aggregate grain size on the strength properties and modulus of elasticity of concrete. This is also due to the fact that few published research results are available in this area. In this paper, the influence of the maximum grain size on the basic strength and deformation properties of concrete is discussed. The research concerns both concretes and gravel aggregates used for their construction with maximum grain sizes of 8 mm, 16 mm and 31.5 mm. The values of the compressive and splitting tensile strength, brittleness and modulus of elasticity of concretes with w/c = 0.45 were analysed. The analysis showed that the strength properties are proportional not only to the maximum size of aggregate grain, but also to the crushing strength of the aggregate. There were no analogous relations found with respect to the modulus of elasticity of the tested concretes. Tensile strength was particularly susceptible to the observed changes.
Highlights
Concrete is a multi−phase and heterogeneous composite whose behaviour varies according to the load applied [1]
When assessing the quality of the aggregate used in concrete, the requirements of the PN-B-06712
[34]when standard can bethe referred to.ofItthe should be noted that requirements contained in Generally, assessing quality aggregate used inthe concrete, the requirements of this the standard have developed byreferred the Polish
Summary
Concrete is a multi−phase and heterogeneous composite whose behaviour varies according to the load applied [1] It consists of the cement matrix, aggregates and mineral and chemical admixtures. Many factors are responsible for its durability and safety of concrete and reinforced concrete structures, including compression strength, tensile strength, modulus of elasticity and brittleness of concrete [2,3,4]. This feature is important if concrete structures with minor defects in their structure are taken into account. The increased porosity of the area should be emphasised [5] and the fact that sedimentation pores may form underneath the coarse aggregate grains. The formation of these pores is encouraged by the size of the coarse aggregate grains
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