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Simplified methods for crack risk analyses of early age concrete: Part 1: Development of Equivalent Restraint Method
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.ORCID-id: 0000-0002-3459-2855
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
Vise andre og tillknytning
2012 (engelsk)Inngår i: Nordic Concrete Research, ISSN 0800-6377, Vol. 46, nr 2, s. 17-38Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The present study deals with both the compensation plane method, CPM, and local restraint method, LRM, as alternative methods studying crack risks for early age concrete. It is shown that CPM can be used both for cooling and heating, but basic LRM cannot be applied to heating. This paper presents an improved equivalent restraint method, ERM, which easily can be applied both for usage of heating and cooling for general structures. Restraint curves are given for two different infrastructures, one founded on frictional materials and another on rock. Such curves might be directly applied in design using LRM and ERM.

sted, utgiver, år, opplag, sider
2012. Vol. 46, nr 2, s. 17-38
Emneord [en]
Local restraint methods, compensation plane method, equivalent restraint method, crack risk, early age concrete., Civil engineering and architecture - Building engineering
Emneord [sv]
Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
HSV kategori
Forskningsprogram
Konstruktionsteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-2677Lokal ID: 054cb94e-1242-4a88-9ab4-29c8bc31a326OAI: oai:DiVA.org:ltu-2677DiVA, id: diva2:975530
Merknad
Validerad; 2012; 20121210 (majali)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-06-20bibliografisk kontrollert
Inngår i avhandling
1. Thermal Crack Risk Estimation and Material Properties of Young Concrete
Åpne denne publikasjonen i ny fane eller vindu >>Thermal Crack Risk Estimation and Material Properties of Young Concrete
2017 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis presents how to establish a theoretical model to predict risk of thermal cracking in young concrete when cast on ground or an arbitrary construction. The crack risk in young concrete is determined in two steps: 1) calculation of temperature distribution within newly cast concrete and adjacent structure; 2) calculation of stresses caused by thermal and moisture (due to self-desiccation, if drying shrinkage not included) changes in the analyzed structure. If the stress reaches the tensile strength of the young concrete, one or several cracks will occur.

The main focus of this work is how to establish a theoretical model denoted Equivalent Restraint Method model, ERM, and the correlation between ERM models and empirical experiences. A key factor in these kind of calculations is how to model the restraint from any adjacent construction part or adjoining restraining block of any type.

The building of a road tunnel and a railway tunnel has been studied to collect temperature measurements and crack patterns from the first object, and temperature and thermal dilation measurements from the second object, respectively. These measurements and observed cracks were compared to the theoretical calculations to determine the level of agreement between empirical and theoretical results.

Furthermore, this work describes how to obtain a set of fully tested material parameters at CompLAB (test laboratory at Luleå University of Technology, LTU) suitable to be incorporated into the calculation software used. It is of great importance that the obtained material parameters describe the thermal and mechanical properties of the young concrete accurately, in order to perform reliable crack risk calculations.  Therefore, analysis was performed that show how a variation in the evaluated laboratory tests will affect the obtained parameters and what effects it has on calculated thermal stresses.

sted, utgiver, år, opplag, sider
Luleå: Luleå tekniska universitet, 2017. s. 85
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Emneord
Thermal cracking risk, young concrete, Equivalent Restraint Method, strength development, heat of hydration, creep, shrinkage, thermal dilation, modeling, field observations
HSV kategori
Forskningsprogram
Konstruktionsteknik
Identifikatorer
urn:nbn:se:ltu:diva-65495 (URN)978-91-7583-951-6 (ISBN)978-91-7583-952-3 (ISBN)
Presentation
2017-10-10, F1031, Luleå, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2017-09-05 Laget: 2017-09-05 Sist oppdatert: 2018-06-20bibliografisk kontrollert

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