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1 书 书 书 ! 52 "  ! 1 # 2017 $ 2 %       &  '  (  )  *  +  +  , JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY        Vol. 52  No. 1 Feb. 2017 !"#$

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ZENG Xiaohui

DAI Yapeng

QU Fulin

et al. Morphology of limestone manufactured sand based on image processing technology

. Journal of Southwest Jiaotong University

2017

52

):

6974.     .123

02582724

2017

01006906    DOI

10. 3969 / j. issn. 02582724. 2017. 01. 010

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TU521. 1    .MNOP

Morphology of Limestone Manufactured Sand

Based on Image Processing Technology

ZENG Xiaohui1

  DAI Yapeng1

  QU Fulin1

  YE Yuezhong1

XUE Yuan2

  WANG Zhimeng2

  ZHENG Yongfei2

1. School of Civil Engineering

Southwest Jiaotong University

Chengdu 610031

China

2. China Railway Eryuan Engineering Group Co. Ltd.

Chengdu 610031

China

Abstract

To quantitatively study the morphological characteristics and regularity of limestone manufactured sand with different particle sizes

digital images of 6 size fractions in total

4. 750 2. 360

2. 360 1. 180

1. 180 0. 600

0. 600 0. 300

0. 300 0. 150 mm and 0. 150 0. 075 mm

sample size of each size fraction is 500

),

were collected by digital camera and stereomicroscope. Based on digital image processing

DIP

),

the circularity

aspect ratio and sphericity of samples were quantitatively determined using software ImagePro Plus. While the fractal dimension of limestone manufactured sand was calculated according to fractal theory. Besides

statistical analysis was used for the morphology characteristics

and the morphology parameters of limestone manufactured sand and river sand were compared. The results indicate that the circularity

aspect ratio and sphericity of limestone manufactured sand with different sizes basically obey the normal distribution. For different

(2)

2 !   "   #   $   %   &   &   ' ( 52 ) size fractions

the changes of circularity

aspect ratio

sphericity and fractal dimension are consistent

signifying that the morphology parameters of limestone manufactured sand or river sand can be characterized by either one of these parameters. The circularity

aspect ratio and sphericity of limestone manufactured sand are 0. 834 0. 857

0. 693 0. 705 and 0. 793 0. 799

less than those of river sand by 5. 0%

7. 2% and 3. 3%

respectively

while its fractal dimension reaches 1. 046 1. 056

higher than that of the river sand by 3. 2% . Finally

the recommended ranges of roundness

aspect ratio

sphericity and fractal dimension in the process of manufactured sand shaping were provided

i. e.

0. 880 1. 000

0. 740 1. 000

0. 820 1. 000 and 1. 010 1. 025. Key words

manufactured sand

morphology

digital image processing

fractal dimension     ÐÑÒ-mÓ

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γ À{|`ab›œ¡´YúV·¸¡´. W 1  4. 750 ~ 2. 360 mm ^_^ `ab›œ¡´¿FW Fig. 1  Circularity histogram of 4. 750 2. 360 mm limestone manufactured sand W 2  4. 750 ~ 2. 360 mm ^_ ^`ab›œ·¸¡´ QQ W Fig. 2  Normal QQ plot of circularity of 4. 750 2. 360 mm limestone manufactured sand åD 5 Ã{|]^_n`ab4{›œõY úµ¶·¸¡´. Ï{|›œ¨<°±Ð² 1 Ÿ Ñ. Ȳ 1 ÁÉ

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UVÁ”ÖH›œyÐ`ab{ |׺2׺. d 1  efgh<=<>?@bcijkl Tab. 1  Statistical results of circularity of limestone manufactured sand with different sizes øïN 67 / mm Êo ›œ @A # Ҝ ž„ Ӝ ž„ ›œº »ÎÏ 4. 750 ~ 2. 360 0. 857 0. 060 0. 141 - 0. 886 0. 430 2. 360 ~ 1. 180 0. 837 0. 063 0. 747 - 0. 637 0. 436 1. 180 ~ 0. 600 0. 834 0. 062 0. 105 - 0. 729 0. 412 0. 600 ~ 0. 300 0. 846 0. 067 0. 890 - 0. 897 0. 409 0. 300 ~ 0. 150 0. 845 0. 071 - 0. 179 - 0. 119 0. 484 0. 150 ~ 0. 075 0. 854 0. 063 0. 440 - 0. 749 0. 338 2. 2  mnoa     Gž„ Ar

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  l--.@A»0Z12P. GB / T 14684

2011 Ê ëƒb

. l3

l-@AÈ45

2011.

  KWAN A K H

MORA C F

CHAN H C. Particle shape analysis of coarse aggregate using digital image processing

. Cement and Concrete Research

1999

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14031410.

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DAVID S

JAMAL K. Digital image 2D and 3D particle assessment using a flatbed scanner

. Magazine of Concrete Research

2015

67

19

):

1033 1047.

  klm

67

89:

U. ûïN]UE

›œ

‡ Ÿœ冩?ž

. Ê;MN+,

2015

18

):

531536. LI Beixing

WANG Wei

CHEN Mengyi

et al. Isometric ratio

roundness and sphericity of coarse aggregates and their relationship

. Journal of Building Materials

2015

18

):

531536.

  ALTUHAFI F

OSULLIVAN C

CAVARRETTA I. Analysis of an imagebased method to quantify the size and shape of sand particles

. Journal of Geotechnical and Geoenvironmental Engineering

2013

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):

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