Measurement of Deflections and Determination of Jointed Plain Concrete Pavements Stiffness by Falling Weight Deflectometer

Březina, Ilja; Grošek, Jiří; Janků, Michal

doi:10.1016/j.proeng.2017.05.322

Cited by 5 publications

(4 citation statements)

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“…The LTE test involves applying a load on a given slab close to its edge and measuring the deflection of the loaded slab and the adjacent unloaded one. The LTE of the joint between these two slabs is customarily defined in deflections (3)(4)(5)(10)(11)(12)(13):…”

Section: Load Transfer Efficiency (Lte) For Structural Evaluation Of ...mentioning

confidence: 99%

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Estimating Load Transfer Efficiency for Jointed Pavements from TSD Deflection Velocity Measurements

Scavone

Katicha

Flintsch

et al. 2023

Transportation Research Record: Journal of the Transportation R

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Transverse joints are the weakest element of jointed pavements, and when these joints lack structural capacity, the onset of load-related distress is imminent. The most widespread measurement of the joints’ structural performance is the Load Transfer Efficiency Index (LTE), a ratio of the deflection of the two adjoining slabs. LTE can easily be assessed with a falling weight deflectometer, but this test procedure is not advisable for evaluation at the network level because of user safety concerns and because it can be excessively time-consuming. Traffic speed deflection devices like the traffic speed deflectometer (TSD) are suitable devices for network-level pavement structural evaluation. Yet, as of today, no interpretation technique to get structural health metrics for jointed pavements from TSD data has been published. In this paper, a backcalculation scheme based on slab theory is proposed to estimate the joints’ LTE from TSD deflection velocity measurements. The backcalculation problem formulation and its numerical solution using fast procedures are described in detail. The approach is tested with TSD data collected on the MnROAD test track. Overall, it was found that the backcalculation converges to reasonable estimates of the pavement structural properties and can furnish LTE estimates for most transverse joints from 5 cm-resolution TSD data, all at a reasonable computational cost. This allows for corridor-wide LTE assessment of a pavement’s joints using TSD measurements.

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Section: Load Transfer Efficiency (Lte) For Structural Evaluation Of ...mentioning

confidence: 99%

“…Alternative definitions and correction factors for LTE exist ( 1 , 4 , 5 , 9 , 10 ). However, the definition provided in equation 1 is the one most used ( 5 , 12 , 13 ).…”

Section: Load Transfer Efficiency (Lte) For Structural Evaluation Of ...mentioning

confidence: 99%

Estimating Load Transfer Efficiency for Jointed Pavements from TSD Deflection Velocity Measurements

Scavone

Katicha

Flintsch

et al. 2023

Transportation Research Record: Journal of the Transportation R

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“…Trafik tekerrür sayısı ve bölgesel koşullara göre uygun derz türünün seçilmemesi durumunda derz bölgesindeki düşey deplasmanlara bağlı olarak kaplamalardaki hasar oluşumu hızlanmaktadır [4]. Beton kaplamalarda düşey deplasman ölçüm yönteminin derz bölgelerinde oluşan hasarların incelenmesinde yaygın olarak kullanıldığı bilinmektedir [5]. Kaplamalar içerisine yerleştirilen donatılar, temel tabakasına yaklaştıkça düşey deplasman oluşumunu azaltmaktadır [6].…”

Section: Introductionunclassified

Beton Yol Uygulamalarında Derz Türlerine Göre Düşey Deplasman Oluşumlarının İncelenmesi ve Maliyet Analizi: Trabzon-Rize Örneği

Çelik¹,

Seferoğlu²,

Akpınar³

et al. 2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Türkiye'de beton yolların kullanımı her geçen gün artmaktadır. Özellikle Doğu Karadeniz Bölgesi'nde 10.000 km'nin üzerinde beton yol bulunmaktadır. Bu çalışmada, Trabzon ve Rize İllerinde yapılan beton yol uygulamaları incelenerek yaygın olarak kullanılan kaplama kalınlığı ve beton basınç dayanımı belirlenmiştir. Karadeniz Teknik Üniversitesi Hızlandırılmış Yol Tesisinde örnek kaplama modeli hazırlanmış ve gerçek trafik yüklemeleri altında beton kaplamaların düşey deplasman değişimleri incelenmiştir. Farklı derz türleri (hasır donatılı yarım derz, donatısız yarım derz, dolgulu tam derz ve dolgusuz tam derz) kullanılarak fayda ve maliyet analizi yapılmıştır. Elde edilen verilere göre, derzlerin yarım derz olması ve kaplamada donatı kullanılması, donatısız yarım derzlere göre 1.3 kat, dolgulu tam derze göre yaklaşık 4 kat, dolgusuz tam derzlere göre ise yaklaşık 9 kat daha az düşey deplasman oluşmasını sağlamaktadır. Ayrıca yapılan maliyet analizlerine göre kaplamalarda hasır donatının bulunması, beton kaplama maliyetine km'de 38.002,76 TL (%11,6) fiyat farkı oluşturmaktadır. Bu bilgiler ışığında, beton kaplamalarda yarım derz yapılmasının ve hasır donatının kullanılmasının kaplama derz bölgelerindeki faydasına oranla maliyetinin oldukça düşük olduğu sonucuna ulaşılmıştır. Ayrıca mevcut tam derzli beton yollarda %7'lik ilave bir maliyet ile derzlerin içinin bitüm esaslı dolgu malzemesi ve kauçuk levhalarla kaplanmasının, düşey deplasman değerlerini en az yarı yarıya azaltılabileceği ve bu sayede kaplama ömrünün uzatılabileceği tespit edilmiştir.

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“…The observations included that the if the multiple gerocell reinforced section if used then it performed better as compared to the single geocell reinforced section [1][2][3]. The study was conducted on the geocell and the observations showed that the application of geocell is useful in the pavements, railways, reinforced wall, etc [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Falling Weight Deflectometer Analysis of Low Volume Roads

Harle¹,

Pajgade²

2019

JCCEE

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The work was carried out on the village roads where the traffic intensity is very low. The roads should be constructed as durable and with minimum construction cost without affecting the strength. Therefore the experiments were carried out on different types of roads. The experiments can be performed in the laboratory but that is not sufficient and therefore the tests should also be performed on the actual constructed pavement patches. The non destructive test is the best way to check the parameters responsible for the effectiveness of pavement. The non destructive testing machines like ground penetrating radar (GPR) and falling weight deflectometer is used to assess different parameters of pavements. The subgrade moduli is also compared with the help of these machines. The falling weight deflectometer (FWD) was carried out on the plastic cell filled concrete block pavement (PCCBP), Geocell filled concrete concrete block pavement (GCCBP) and grouted macadam (GM). The deflection, modulus of elasticity, strain, thickness calculation, area, RRS were calculated through this test by the back calculation. From this observation it is found that the geocell filled concrete block pavement performed well as compared to the other pavements in terms of the calculated parameter. The deflection was more in the grouted macadam when compared with the PCCBP and GCCBP.

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Measurement of Deflections and Determination of Jointed Plain Concrete Pavements Stiffness by Falling Weight Deflectometer

Cited by 5 publications

References 0 publications

Estimating Load Transfer Efficiency for Jointed Pavements from TSD Deflection Velocity Measurements

Estimating Load Transfer Efficiency for Jointed Pavements from TSD Deflection Velocity Measurements

Beton Yol Uygulamalarında Derz Türlerine Göre Düşey Deplasman Oluşumlarının İncelenmesi ve Maliyet Analizi: Trabzon-Rize Örneği

Falling Weight Deflectometer Analysis of Low Volume Roads

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