3D void distribution in concrete2011 Spring, EPS207, Juhyuk Moon

Background:

Objective:Effects of curing temperature &ASR(alkali-silica reaction) on void distribution

Method:Micro-TomographyConstruct 3D void map using Matlab

Solution!Problem!http://www.ce.berkeley.edu/

~paulmont/

original image

1st image of 500 stacking imagesoriginal image

Matrix

Original :2075 by 2075 PixelsResize to 500 by 500 PixelsScale: 1pixel = 0.0087 mm Void

Aggregate

18 mm

4.35 mm

0.87 mm

original image bw, im2bw S, median smoothing erode after smoothed

close after erode open after closeclose after open VM, void map

Void segmentation

<void map, larger than 100 pixels>

<bw, 0.46 thresh> <median smoothing w/ size 2>

<erode w/ radius 1><original image>

<close w/ radius 2> <open w/ radius 2> <close w/ radius 5>

0 100 200 300 400 500 6000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

void number

void

vol

ume

(mm

3 )

3D-Reconstruction of void

85°C curing + ASR

85°C curing

20°C curing

0 500 1000 1500 20000

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

void numbervo

id v

olum

e (m

m3 )

0 200 400 600 800 1000 1200 14000

0.1

0.2

0.3

0.4

0.5

0.6

0.7

void number

void

vol

ume

(mm

3 )

10-4 10-3 10-20

50

100

150

200

250

300

log(void volume,(mm3))

num

ber o

f voi

ds

85`C

85`C+ASR

20`C

3D Void distribution

original image

A

BA

B

4.35 mm