ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Fracture under compression is one of the most commonly studied properties of geomaterialslike concrete and rock, in particular since these materials reach their best performance incompression. The fracture process is however rather complex due to the heterogeneous structures ofsaid materials. Over the years fundemental studies of fracture under compression have led to amuch improved insight in the details of the fracture process depending on the actual composition ofthe material. Fracture can be described by means of a 4-stage fracture model, which included asmost important aspects pre-peak cracking, which is stable and can be arrested by stiffer and strongerelements in the material structure, and post-peak cracking [1]. The latter macroscopic cracks arebasically un-stable and can only be arrested by measures at a structural scale, such as applyingconfining stress or by using positive geometries. The material structure cannot assist in the arrest ofthe large energetic cracks other than locally affecting the crack path. In the paper an overview isgiven of the fracture process in compression. Recently we embarked on studying compressivefracture using a simpler material structure, namely foamed hardened cement paste [2]. Stiffaggregates that are normally included in normal concrete have been left-out; instead a larger thanusual quantity of large pores is brought into the material, even up to 80%. Studying fractureprocesses in this simpler material system ultimately allows for a better understanding of the detailsof the pre-peak cracking process, which is considered more important than the post-peak processsince it defines strength
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.207.pdf
Permalink