Baza Publikacji Pracowników Politechniki Lubelskiej

Status:
Autorzy:	Sadowski Tomasz, Golewski Grzegorz Ludwik
Rok wydania:	2008
Wersja dokumentu:	Drukowana \| Elektroniczna
Język:	angielski
Numer czasopisma:	1
Wolumen/Tom:	43
Strony:	119 - 126
Impact Factor:	1,549
Web of Science® Times Cited:	52
Scopus® Cytowania:	66
Bazy:	Web of Science \| Scopus
Efekt badań statutowych	NIE
Materiał konferencyjny:	NIE
Publikacja OA:	NIE
Abstrakty:	angielski
	Hardened concrete is a brittle composite material characterised by non-homogeneous internal structure. Under the influence of exter-nal loads composites destruction is caused by: discontinuities created by technological defects or local differences of mechanical prop-erties of concrete components. In the vicinity of discontinuities local concentration of stresses occurs. They can cause (undercompressive loading) defects initiation and their stable propagation, which leads to degradation of the whole material sample or struc-tural element. The brittle fracture process occurs when the large defects start to growth in the unstable manner.The internal structure of the concrete is very complex due to changes of the number of defects and their shapes during the wholeloading process up to the final failure. Cracks, which arose in the interfacial aggregate–mortar transition zone (ITZ) propagate mainlyin cement matrix in the surrounding area of the concrete aggregate. Grain shapes cause: bending of cracks, wing initiation at tips ofstraight cracks and creation of defects with more complex shapes.The paper presents the method of mesomechanical modelling of compressed concrete. The subject of investigation is cement compos-ites which are made on the basis of limestone (L) and gravel aggregates (G). The paper is particularly focused on an effect of grain diam-eters on the macroscopic response of the concrete. Crack dimensions, shapes and numbers are strictly related to the aggregate diametersof the concrete composite. The aggregate material strongly influences the mechanical properties of the ITZ and further overall mechan-ical response as well as crack propagation conditions. The presented theoretical predictions of different concretes and experimental inves-tigations lead to the conclusion that the appropriate selection of grain diameter can improve structural properties of the concretecomposites and enlarge their applications.

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Effect of aggregate kind and graining on modelling of plain concrete under compression

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