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Rapid Repair of Concrete Pavements Using Precast Technology
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0009-0003-3151-9067
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0002-1526-9331
2023 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Pavements are essential for the country's development and comprise significant investments. Thewell-operating pavement networks sustain society for a long time. Asphalt and concrete are twocompetitive paving materials used for pavements. In Sweden, the major part of road infrastructureconsists of asphalt due to the strong asphalt industry, while only 1% of pavement networks areconcrete. Concrete pavements are common in the United States (US) and European countriessuch as Germany, Switzerland, Belgium, Austria and France.The intensity of traffic loads has increased exceptionally with time, demanding high wear-resistantpavements. Concrete pavements are superior for highways subjected to the high number of loadrepetitions or for heavy traffic volume roads. Concrete pavements are stiff, durable, wear-resistant,do not deform under permanent and concentrated loads, and have a longer service life. Damagesare rare on concrete pavement, but sooner or later, rehabilitation may be needed. Various types ofconcrete pavement exist, but this paper is limited to the jointed plain concrete pavement as it is themost common pavement system used in Sweden.The rehabilitation of concrete pavements is challenging in heavy traffic volume roads due to trafficcongestion, and if cast-in-place concrete is used, it will substantially affect traffic throughdisruptions. However, it is now possible to repair concrete pavement during shortened work–window. A technology has been introduced internationally based on precast concrete slabs and iswidely used in the US and Canada. The research in this Ph.D project aims to adapt the USexperience with precast technology to Swedish conditions, i.e., geology, studded tire effect, rulesand traditions of procurement etc. The strategy to adapt the existing experience of this innovativetechnology to Swedish conditions includes a literature survey, numerical simulation and field testsof precast concrete slabs, which will be discussed in this paper. 

Place, publisher, year, edition, pages
2023.
Keywords [en]
concrete pavements, precast concrete slab, repair, numericalsimulation, field test
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering, Concrete Structures
Identifiers
URN: urn:nbn:se:kth:diva-334512OAI: oai:DiVA.org:kth-334512DiVA, id: diva2:1789985
Conference
14th International Symposium on Concrete Roads, Krakow, Poland, June 25 - 28, 2023
Note

QC 20230825

Available from: 2023-08-21 Created: 2023-08-21 Last updated: 2024-02-05Bibliographically approved
In thesis
1. Concrete pavements’ repair techniques and numerical assessment of dowel bar load transfer efficiency
Open this publication in new window or tab >>Concrete pavements’ repair techniques and numerical assessment of dowel bar load transfer efficiency
2024 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Concrete pavements are a suitable alternative for high-traffic volume roads, concentrated loads and roads exposed to severe weather conditions. In Sweden, among other reasons, the scarcity of concrete pavements is attributed to the need for more national knowledge and expertise in the field. The most recent concrete pavement was constructed seventeen years ago in Uppsala. Concrete pavements are renowned for their longevity and durability. Jointed plain concrete pavements (JPCP) are the most frequent type of concrete pavements. However, it is important to note that the joints in concrete pavements are critical components that can lead to various distresses, necessitating rehabilitation. Rehabilitating concrete pavements is particularly challenging in areas with heavy traffic and requires substitute routes because of the imperative to maintain traffic flow during construction. Developing effective detours might involve significant alterations to the existing routes or building temporary roads, which entails substantial cost investment and time consumption.

A literature review has been conducted to study the available methods that can be used to repair concrete pavements. The strategy for selecting a repair technique is based on rehabilitating the concrete pavement within a short work window, deterring traffic congestion and ensuring the long service life of the pavements. The study showed that the precast concrete technology based on the precast slab is a promising technology that effectively shortens the lane closure for repairing damaged pavements and produces durable pavements, thereby extending the service life of pavements. However, the construction or rehabilitation cost of concrete pavement using precast slabs is 1.6 to 4 times higher than that of conventional cast-in-place concrete. Therefore, rehabilitation using precast slabs is inappropriate for low-traffic roads and temporary routes.

Joints are crucial for the rehabilitation of concrete pavements with precast slabs. The structural performance of concrete pavement is, however, greatly affected by the joints, as the presence of joints creates a discontinuity between adjacent slabs and thus diminishes the load transfer to the abutting slab. To maintain the structural integrity of the pavement system, dowel bars are used at the transverse joints.

A numerical study has been conducted to evaluate the influence of various dowel-related parameters on the interaction between adjacent concrete slabs. The study revealed that the dowel bar’s position, mislocation and diameter had an obvious effect on joint efficiency, while the bond between the concrete slab and the dowel bar slightly affected the load transfer efficiency. It was also investigated that the dowel bar’s intended performance, i.e., load transfer efficiency, was reduced as the joint gap between adjacent slabs increased.

Abstract [sv]

Betongbeläggningar är ett lämpligt alternativ för högtrafikerade vägar, koncentrerad belastning och vägar utsatta för svåra väderförhållanden. I Sverige är betongvägar sällsynta vilket bl.a. beror på brist på kunskap och kompetens. Den senaste betongvägen byggdes för sjutton år sedan i Uppsala.Betongbeläggningar är kända för sin långa livslängd och hållbarhet. Den vanligaste typen av betongvägar är fogade, oarmerade betongbeläggningar. Ändå är det viktigt att notera att fogarna i betongbeläggningar är kritiska komponenters om kan leda till olika olägenheter, vilket kräver rehabilitering. Att rehabilitera betongbeläggningar är särskilt utmanande i områden med intensiv trafik som kräver ersättningsvägar på grund av nödvändigheten att upprätthålla trafikflödet under reparationsarbetena. Att ta fram en effektiv omledning av trafiken kan innebära antingen väsentliga förändringar och förlängningar av befintliga rutter eller byggande av tillfälliga vägar, vilket medför betydande kostnadsinvesteringar och tidsåtgång.

En litteraturöversikt har genomförts för att studera de tillgängliga metoderna som kan användas för att reparera betongbeläggningar. Strategin för valet av reparationsmetod bygger på att rehabilitera betongbeläggningen inom ett kort arbetsfönster, förhindra trafikstockningar och säkerställa lång livslängd för beläggningen. Studien visade att förtillverkade betongplattor är en lovande metod som effektivt förkortar avstängningen av körfält för att reparera skadad beläggning och producerar hållbara betongbeläggningar med lång livslängd. Rehabiliterings kostnaden för betongbeläggning med prefabricerade plattor är emellertid 1,6 till 4 gånger högre än den för konventionell platsgjuten betong. Därför är rehabilitering med förtillverkade betongplattor olämplig för vägar med låg trafik och temporära rutter.

Fogar är vidare nödvändiga vid reparation med förtillverkade betongplattor.Betongbeläggningens strukturella prestanda påverkas dock kraftigt av fogar, eftersom förekomsten av fogar skapar en diskontinuitet mellan intilliggande plattor och därmed minskat lastöverföringen till den angränsande plattan. För att upprätthålla den strukturella integriteten hos beläggningssystemet används dymlingar i de tvärgående fogar.

En numerisk studie har genomförts med olika parametrar för att utvärdera dymlingens inverkan på fogens effektivitet. Studien visade att dymlingens position, felplacering och diameter har en tydlig inverkan på fogens effektivitet, medan vidhäftningen mellan dymling och betongplatta enbart verkar ha en marginell inverkan på fogens effektivitet. Studien visade också att dymlingens prestanda, dvs. lastöverföringsförmågan, minskade då fogöppningen eller glappet mellan två närliggande plattor ökade.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2024. p. 40
Series
TRITA-ABE-DLT ; 2356
Keywords
Concrete pavements, Rapid repair, Precast slabs, Dowel bar, Load transfer efficiency
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering, Concrete Structures
Identifiers
urn:nbn:se:kth:diva-343022 (URN)978-91-8040-808-0 (ISBN)
Presentation
2024-03-12, B3, Brinellvägen, Campus KTH, https://kth-se.zoom.us/j/61107600823, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 240207

Available from: 2024-02-07 Created: 2024-02-05 Last updated: 2024-02-12Bibliographically approved

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Yaqoob, SaimaSilfwerbrand, Johan

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