Fuzzy set approach to condition assessments of novel sustainable pavements in the Canadian climate

2009 ◽  
Vol 36 (5) ◽  
pp. 754-764 ◽  
Author(s):  
Amir Golroo ◽  
Susan L. Tighe
Keyword(s):  
Fuzzy Set ◽  
Ad Hoc ◽  
Condition Index ◽  
Concrete Pavement ◽  
Pervious Concrete ◽  
Pavement Condition ◽  
Pavement Structures ◽  
Condition Indices ◽  
Condition Assessments

Since the use of pervious concrete pavement structures (PCPSs) is essentially still in the trial stage in Canada, long-term and quantitative pavement condition data are not available. The existing approaches applied to assess pervious concrete pavement structure (PCPS) conditions are ad hoc and suffer from methodological limitations. A fuzzy set technique is proposed herein as an efficient tool for dealing with qualitative and incomplete pavement condition data on distress types, severities, densities, and weighting factors. Using this method, a comprehensive fuzzy condition index was developed based on Ministry of Transportation of Ontario (MTO) methodology and using fuzzy pavement condition data. This fuzzy condition index was converted to a single value that allowed for comparisons of pavement conditions using several ranking techniques. A case study of 24 PCPS sites was utilized to demonstrate how the fuzzy representations of the condition index compared with associated single values. It is shown that this approach can effectively provide extensive condition indices for PCPSs and rank them accordingly, using only limited and imprecise pavement condition data.

scholarly journals Deriving condition indices from standard fisheries databases and evaluating their sensitivity to variation in stored energy reserves

2004 ◽  
Vol 61 (10) ◽  
pp. 1900-1917 ◽  
Author(s):  
C Tara Marshall ◽  
Coby L Needle ◽  
Nathalia A Yaragina ◽  
Adnan M Ajiad ◽  
Evgeny Gusev
Keyword(s):  
Body Size ◽  
Gadus Morhua ◽  
Barents Sea ◽  
Condition Index ◽  
Energy Reserves ◽  
Stored Energy ◽  
Stock Level ◽  
Length Relationship ◽  
Condition Indices

To evaluate interstock differences in condition, it would be advantageous to develop stock-level condition indices from standardized databases on weight and length. This study describes a method for estimating stock-level condition when individual-level observations on length and weight are not easily accessible. For each year in a 56-year time series (1946–2001) for Northeast Arctic cod (Gadus morhua), pseudo-observations of weight and length were generated by pairing the Norwegian and Russian values for weight-at-age provided annually to the assessment working group with estimates of length-at-age derived from the same databases. A weight–length relationship fit to each year was then used to predict weight-at-length, i.e., girth, for a range of standard lengths (30–120 cm). This index was uncorrelated with both the liver condition index and the abundance of Barents Sea capelin (Mallotus villosus), suggesting that at the stock level, the girth of cod is not necessarily indicative of the magnitude of stored energy reserves. Partitioning body size into length-at-age and girth revealed long-term trends in body size. In particular, large/old cod showed substantially higher values of both length-at-age and girth that could be the result of long-term increases in fishing mortality.

scholarly journals Long-Term Field Performance of Pervious Concrete Pavement

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Aleksandra Radlińska ◽  
Andrea Welker ◽  
Kathryn Greising ◽  
Blake Campbell ◽  
David Littlewood
Keyword(s):  
Field Performance ◽  
Concrete Pavement ◽  
Pervious Concrete ◽  
Unit Weight ◽  
Freezing And Thawing ◽  
Porous Pavement ◽  
Pavement Thickness ◽  
Multiple Samples ◽  
Term Field

The work described in this paper provides an evaluation of an aged pervious concrete pavement in the Northeastern United States to provide a better understanding of the long-lasting effects of placement techniques as well as the long-term field performance of porous pavement, specifically in areas susceptible to freezing and thawing. Multiple samples were taken from the existing pavement and were examined in terms of porosity and unit weight, compressive and splitting tensile strength, and the depth and degree of clogging. It was concluded that improper placement and curing led to uneven pavement thickness, irregular pore distribution within the pervious concrete, and highly variable strength values across the site, as well as sealed surfaces that prevented infiltration.

Pervious concrete pavement performance modeling: an empirical approach in cold climates

2012 ◽  
Vol 39 (10) ◽  
pp. 1100-1112 ◽  
Author(s):  
Amir Golroo ◽  
Susan L. Tighe
Keyword(s):  
Performance Index ◽  
Functional Performance ◽  
Field Work ◽  
Condition Index ◽  
Concrete Pavement ◽  
Pervious Concrete ◽  
Performance Models ◽  
Empirical Performance ◽  
Surface Distress ◽  
Two Phases

Pervious concrete pavement (PCP) is an appropriate means to meet growing environmental demands. To apply pervious concrete as a pavement, its performance should be studied over its life span. This research aims to develop empirical performance models based on a proposed condition index through incorporation of integrated laboratory and field work. Since no condition index has been developed for PCP to date, first, a condition index is developed. The condition index is proposed as a combination of two indices: a surface distress index and a functional performance index. Two sources of data have been collected to develop performance models including panel rating and field investigations. Performance models are developed in two phases using regression analysis techniques. In phase I, performance models are presented as functions of a surface distress index and a functional performance index, while in phase II, performance models are correlated with pavement age and successfully validated.

VALIDITY OF GARBER MODEL IN PREDICTING PAVEMENT CONDITION INDEX OF FLEXIBLE PAVEMENT IN KERBALA CITY

2018 ◽  
Vol 09 (02) ◽  
pp. 139-151
Author(s):  
Hussein Ewadh ◽  
◽  
Raid Almuhanna ◽  
Saja Alasadi ◽  
◽  
...  
Keyword(s):  
Condition Index ◽  
Flexible Pavement ◽  
Pavement Condition ◽  
Pavement Condition Index
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