CORRELATION BETWEEN CHARACTERISTIC DISTANCES OF AIR VOIDS AS POINT PROCESSES AND SPACING FACTORS IN MORTARS

Author: Hidefumi Koto, Takuma Murotani and Shin-ichi Igarashi
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference Segment on Frost Action in Concrete
Editor(s): Marianne Tange Hasholt, Katja Fridh and R. Doug Hooton
ISBN:978-2-35158-182-7
e-ISBN:978-2-35158-183-4
Publisher:RILEM Publications SARL
Publication year:2016
Pages:92-101
Total Pages:10
Language:English

Abstract: Images of air voids were acquired with a flatbed scanner. Distribution of air voids in the images was regarded as a spatial point process. The nearest neighbour distance function was calculated for the point process. The median distance determined by the function was proposed as a characteristic average distance between air voids. The median distance in a point process was compared with the conventional spacing factor. In addition, taking account of the presence of aggregate particles, air-void systems in real mortars were simulated as interrupted point processes. The median distances between air voids in real mortars had a strong correlation with the spacing factors. Furthermore, there also exists a good correlation between the median distances of the simulated point processes and the spacing factors of real voids. Thus, conversion of air-void systems to point processes is useful for evaluating actual spatial arrangement of air voids. The point process function enables to estimate the spacing factor easily.

Online publication:2016
Publication type:full_text
Public price (Euros):0.00