Difference between revisions of "OPSS aggregates"

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Where void ratio has been estimated from the coefficient of uniformity (C<sub>U</sub>):
The void ratios above were estimated based on the coefficient of uniformity (C<sub>U</sub>)<ref>Vuković, Milan and Soro, Andjelko Determination of hydraulic conductivity of porous media from grain-size composition. Water Resources Publications, Littleton, Colo, 1992.</ref><ref>Odong, J. (2007). Evaluation of Empirical Formulae for Determination of Hydraulic Conductivity based on Grain-Size Analysis. Journal of American Science, 3(3). Retrieved from http://www.jofamericanscience.org/journals/am-sci/0303/10-0284-Odong-Evaluation-am.pdf</ref><ref>Zhang, S. (2017). Relationship between Particle Size Distribution and Porosity in Dump Leaching. the University of British Columbia. Retrieved from https://open.library.ubc.ca/collections/ubctheses/24/items/1.0357233</ref>:
<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
<math>C_U=\frac{d_{60}}{d_{10}}</math>
<math>C_U=\frac{d_{60}}{d_{10}}</math>
Permeability (K) was estimated from the 10th percentile using the [[Hazen]] formula. 
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Revision as of 18:33, 18 March 2018

Grain size analysis, percent passing[1]
Sieve size (mm) A B I B II B III M O SSM
High Low High Low High Low High Low High Low High Low High Low
150 100 100 100 100 100 100
106 100 100
37.5 100 100
26.5 100 100 50 100 50 100 50 100 95 100 50 100
19 85 100 100 100 80 95
13.2 65 90 75 95 60 80
9.5 50 73 32 100 55 80 50 70
4.75 35 55 20 100 20 55 20 90 35 55 20 45 20 100
1.18 15 40 10 100 10 40 10 60 15 40 0 15 10 100
0.3 5 22 2 65 5 22 2 35 5 22 5 95
0.15 15 2 65
0.075 2 8 0 8 0 10 0 8 2 8 0 5 0 25
d60 13 6 35 0.25 25 6 40 1.2 10 5 15 7 35 0.15
d10 0.7 0.1 1 0.08 1.2 0.075 1.2 0.085 0.6 0.09 2.5 0.3 1.2 NN
Content Uniformity 19 60 35 3 21 80 33 14 17 56 6 23 29
Void ratio (Vukovic) 0.26 0.26 0.26 0.40 0.26 0.26 0.26 0.27 0.27 0.26 0.34 0.26 0.26
Mean void ratio (Vukovic) 0.26 0.33 0.26 0.26 0.26 0.3 0.26
K(Hazen)(mm/hr) 1764 36 3600 23.04 5184 20.25 5184 26.01 1296 29.16 22500 324 5184 NN
Mean K(hazen)(mm/hr) 900 1812 2602 2605 663 11412 NN

The void ratios above were estimated based on the coefficient of uniformity (CU)[2][3][4]: Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:

Permeability (K) was estimated from the 10th percentile using the Hazen formula.

  1. ↑ OPSS. (2013). Material Specficiation for Aggregates - Base, Subbase, Select Subgrade, and Backfill Material. Retrieved from http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/0b9aa4d966cac4f9852580820062909e/$FILE/OPSS.MUNI%201010%20Nov%2013.pdf
  2. ↑ Vuković, Milan and Soro, Andjelko Determination of hydraulic conductivity of porous media from grain-size composition. Water Resources Publications, Littleton, Colo, 1992.
  3. ↑ Odong, J. (2007). Evaluation of Empirical Formulae for Determination of Hydraulic Conductivity based on Grain-Size Analysis. Journal of American Science, 3(3). Retrieved from http://www.jofamericanscience.org/journals/am-sci/0303/10-0284-Odong-Evaluation-am.pdf
  4. ↑ Zhang, S. (2017). Relationship between Particle Size Distribution and Porosity in Dump Leaching. the University of British Columbia. Retrieved from https://open.library.ubc.ca/collections/ubctheses/24/items/1.0357233

The void ratio (e) of a mixture is the ratio of the volume of void-space to the volume of solids. It is closely related to the concept of porosity (n) where porosity is the ratio of the volume of void-space to the total or bulk volume of the mixture. e = Volume of voids/Volume of solids = n/(1-n)

The void ratio (e) of a mixture is the ratio of the volume of void-space to the volume of solids. It is closely related to the concept of porosity (n) where porosity is the ratio of the volume of void-space to the total or bulk volume of the mixture. e = Volume of voids/Volume of solids = n/(1-n)

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.

A parameter that describes the capability of a medium to transmit water.

The porosity (n) of a mixture is the ratio of the volume of void-space to the total or bulk volume of the mixture. It is closely related to the concept of void ratio (e) where void ratio is the ratio of the volume of void-space to the volume of solids. n = Volume of voids/Total volume of mixture = e/(1+e)

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