scholarly journals Determining Pavement Layers Thickness and Moduli According to Non-Destructive Testing and Back Analysis (Case Study: Azadegan Freeway-Tehran)

2015 ◽  
Vol 8 (19) ◽  
Author(s):  
Reza Jafari Zave
Keyword(s):  
Back Analysis ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pavement Layers ◽  
Non Destructive

scholarly journals Application of GPR and FWD in Assessing Pavement Bearing Capacity

2013 ◽  
Vol 2 (2) ◽  
pp. 11-21 ◽  
Author(s):  
Josipa Domitrović ◽  
Tatjana Rukavina
Keyword(s):  
Bearing Capacity ◽  
Layer Thickness ◽  
Structural Condition ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pavement Maintenance ◽  
Pavement Layers ◽  
End Use ◽  
Comparison Of The Results ◽  
Non Destructive

Abstract The process of pavement maintenance and rehabilitation starts by collecting the data which will form the base for evaluation of pavement functional and structural condition. Collection of data can be performed by destructive and non-destructive testing. Usually preferred are the non-destructive methods, that do not damage the pavement, and the process of pavement evaluation is objective and repeatable. Non-destructive testing methods are becoming more and more popular, especially for assessing the structural condition of the pavement. Non-destructive testing by a Falling Weight Deflectometer (FWD) and the analysis of so collected data by the process of backcalculations is today the usual tool for assessing pavement bearing capacity. One of the basic input parameters for analysis of the data collected by FWD is pavement layers thickness. The practice in Croatia is to determine pavement layers thickness by coring. This destructive method affects pavement integrity, so the number of such tests should be kept to the minimum. By coring the accurate thickness of all pavement layers is obtained on specific point locations. Thus, numerous deviations in layer thickness remain unnoticed, and in the end, use of such data for the process of backcalculations does not provide ac urate values of layer moduli. Coring can be replaced with non-destructive method of testing by Ground Penetrating Radar (GPR), which provides continuous information on thickness of all pavement layers. The paper shows the method for assessing the bearing capacity of the pavement based on the data collected by FWD, GPR and coring. The calculation for layer moduli was performed by the ELMOD software, separately for the layers thickness data obtained by coring, and separately for the thickness obtained by GPR tests. Analysis and comparison of the results of calculated elasticity moduli obtained by using various methods for collecting layer thickness data were performed in the paper.

scholarly journals Non-destructive testing and assessment of dynamic incompatibility between third-party piping and drain valve systems: an industrial case study

2014 ◽  
Vol 29 (2) ◽  
pp. 154-163 ◽  
Author(s):  
Keen Kuan Kong ◽  
Siamak Noroozi ◽  
Abdul Ghaffar Abdul Rahman ◽  
Mihai Dupac ◽  
Hoe Cheng Eng ◽  
...  
Keyword(s):  
Third Party ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Industrial Case Study ◽  
Non Destructive

scholarly journals Status assessment of buildings using existing data and identifying gaps in data from performance indicators

2021 ◽  
Vol 2069 (1) ◽  
pp. 012026
Author(s):  
Jan Mandinec ◽  
Pär Johansson
Keyword(s):  
Performance Indicators ◽  
Performance Indicator ◽  
Building Envelope ◽  
Current Status ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Data Gaps ◽  
Status Assessment ◽  
Non Destructive

Abstract In past decades, several performance indicators have been developed allowing to objectively assess current status or predict failures of material, components and other factors like moisture safety. However, each performance indicator requires its unique sets of data, which are often difficult to obtain. It is therefore of interest whether a combination of several indicators is applicable in older buildings which often lack readily available documentation. The aim of this study is to identify data gaps preventing the use of indicators and to ascertain whether missing data can be filled by combining visual inspections and non-destructive testing. The first part of the paper summarizes known building envelope related indicators and arrange them into three groups: general, hygrothermal and service life performance indicators. The second part is a case study where the applicability of selected performance indicators is tested against an in-house database consisting information about 610 buildings in Gothenburg. It was found that the use of performance indicators is limited as the gaps in the available data are present for all types of performance indicators. The material composition of buildings envelope was identified as the most substantial gap. This limited the use of hygrothermal performance indicators in 58.5% of the buildings.

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