Abstract
The article shows investigations on the behavior of preplaced aggregate concrete with regular and irregular coarse aggregates. The thermal properties, compressive strength, and internal structure were analyzed based on computed tomography images. The regular and irregular shapes of aggregates were obtained according to patented technology, which is possible to produce in both laboratory and industrial conditions. Based on the conducted calculations, heat storage capacity was assessed. The influence of grain shape on the material strength, porosity, and hydration gaps was determined. Debonded porosity, as a result of aggregate impurities, was shown using computer tomography analysis. It was shown that the arrangement and shape of the grains has a significant impact on the performance properties of hardened preplaced concrete.
Highlights
Different types of concrete are widely used in all types of civil engineering constructions.Approximately 70% of its volume is aggregate, and the quality of the aggregate significantly affects the properties of the concrete mix, such as consistency, workability, and water demand, as well as the properties of the hardened concrete e.g., strength, waterproofing, water absorption, and frost resistance [1]
Too large amounts of fine grains increase the demand of the whole system for cement and water, which may, apart from economic reasons, lead to a decrease in some of the utility parameters of hardened concrete
Concrete sample No 3 cooled direction of heat flow was parallel to the grain arrangement
Summary
70% of its volume is aggregate, and the quality of the aggregate significantly affects the properties of the concrete mix, such as consistency, workability, and water demand, as well as the properties of the hardened concrete e.g., strength, waterproofing, water absorption, and frost resistance [1]. In its internal structure that tightly fills the material volume This is necessary in order to minimize the cement consumption that is needed for bonding. When creating this “scaffolding”, the following principle should be taken into consideration: the ratio of coarse to fine aggregate is higher when the grain size of the fine aggregate is finer. Fine aggregate (sand) performs the stabilizing role of the concrete mix, affecting its workability, viscosity, and susceptibility to segregation, while coarse aggregate (gravel, grits) is a volume filler [3].
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