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Pro118-2

Easy Evaluation of Air-void Systems in Concrete as Spatial Point Processes Tkakuma Murotani, Hidefumi Koto and Shin-ichi Igarashi



Author(s):
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 408-417
Total Pages: 10
Language : English


Abstract: Air-void systems in concretes were treated as spatial point processes. The spacing between air voids in concrete was evaluated by the statistics functions for the process. The R software was used to calculate the functions. Air voids in real concretes look clustered since aggregate particles prevent their random arrangement. However, comparison of the air-void systems in real concrete and the simulated systems confirms that air voids can be regarded as random points dispersed within a cement paste matrix. This means that any air-void systems in concretes can be simply represented by random point patterns. A characteristic distance of the random distribution of air voids was defined by the nearest-neighbour distance function. The characteristic distances in real concretes were almost comparable to the spacing factors defined in ASTM C457. Furthermore, the characteristic distances in the simulated point patterns were also almost the same as the spacing factors. The characteristic distance can be used as a new parameter to evaluate air-void systems in concretes. Otherwise, the proposed method using the point process statistics can be an alternative way to obtain the spacing factor of ASTM easily.


Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00


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