A Prediction Method of Tensile Young's Modulus of Concrete at Early Age

Yoshitake, Isamu; Rajabipour, Farshad; Mimura, Yōichi; Scanlon, Andrew

doi:10.1155/2012/391214

Cited by 30 publications

(16 citation statements)

References 10 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the state-of-the art machining technologies with computerized numerical control (CNC), it is nowadays possible to prepare rock samples with any shape. The use of dog bone-shaped samples for direct tensile tests is actually state of the art in many engineering disciplines, including concrete testing (Yoshitake et al 2012;Moradian and Shekarchi 2016) and also rock testing (Gorski et al 2007). The primary purpose normally is to improve the clamping area using simplified dog bone-shaped samples.…”

Section: Methodsmentioning

confidence: 99%

Alternative Approaches for the Determination of Unconfined Rock Deformation and Strength Properties

2019

View full text Add to dashboard Cite

The usage of numerical simulation tools in rock engineering has been the undisputed state of the art for decades. Not only for rock engineering applications in the field of underground and surface stability analysis, but also for the simulation of the rock-cutting process. With increasing computing capacity and as a consequence thereof, increased capabilities of available constitutive laws, the determination of reliable input parameters is critical. The detailed characterization and implementation of stress-strain relations, including the hardening and softening regime, is a major task. While efficient guidelines and established procedures exist for compressive loading, the current state of the art for tensile loading in the majority of the cases is inadequate. Samples often fail invalidly, either due to poor preparation or due to the impact of undesired bending and torsional loading. For that reason, an innovative purely mechanical test setup is proposed in this article, which eliminates the identified confounding effects. Furthermore, an alternative procedure for the investigation of rock dilatancy under unconfined conditions is presented. Although dilatancy is normally associated with multiaxial stress states and determined by triaxial compression tests, the behaviour of unconfined rock under far field compression represents an essential load case in rock cutting, but also in the surroundings of underground openings. The proposed procedure is based on torsion tests because of their capability to generate stress states of pure shear without exhibiting axial splitting and related negative effects. With the help of numerical simulations, a reasonable range for the dilatancy can be estimated and compared to common methods of determination via unconfined compression tests.

show abstract

Section: Methodsmentioning

confidence: 99%

Alternative Approaches for the Determination of Unconfined Rock Deformation and Strength Properties

2019

View full text Add to dashboard Cite

show abstract

“…According to the literature, the elastic modulus seems to be slightly higher in tension than in compression. This difference varied between 9 and 15% generally (Atrushi 2003;Bissonnette et al 2007;Hagihara et al 2000;Yanni 2009;Yoshitake et al 2012) and can be related to the difference of stress level and the influence of microcracking process (Delsaute 2016;Delsaute et al 2016). Moreover, the tensile short term creep is much lower than the compressive short term creep (Delsaute 2016c).…”

Section: Restrained Of the Autogenous And Thermal Strainmentioning

confidence: 99%

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

Schlicke²,

Benboudjema³

et al. 2019

ACT

View full text Add to dashboard Cite

This special issue of the Journal of Advanced Concrete Technology presents seven invited journal papers, which were selected on basis of outstanding conference contributions during the International RILEM/COST conference SynerCrete'18, held on 24-26 October 2018 in Funchal, Madeira Island, Portugal, which gathered 183 participants. The selection was made by the scientific committee and the chairpersons among 184 contributions. The conference itself dealt with interdisciplinary approaches for cement-based materials and structural concrete, intending to provide added value through collaborations across the entire field of structural concrete-ranging from concrete technology, over simulation and structural design, production and building, up to operation, monitoring and maintenance. Exciting fields of research such as performance-based design, 3D modelling for analysis/design, Building Information Modelling and even robotics (e.g. digital fabrication or robotics design) were included, while retaining focus on multi-scale approaches at time and spatial levels. Overall, the hereby promoted journal papers are representative for the successful balance act between a great versatility of the conference contributions and the targeted synergizing of expertise aiming on the ultimate goal of reliable and durable concrete structures. SynerCrete'18 also marked the end of COST Action TU1404 "Towards the next generation of standards for service life of cement-based materials and structures" (www.tu1404.eu), offering a final forum to the discussions raised during the funded period of the Action from 2014 to 2018. A sense of accomplishment was felt by all the members of the Action, in the view of the important achievements of networking tools that were brought about by the extended Round Robin Testing Programme (RRT+), the Numerical Benchmarking Activities and 24 Short Term Scientific Missions (STSMs). Some of the selected papers in this special issue are the result of fruitful collaborations initiated by COST Action TU1404. A further remark in regard to the wide international institutional support that this conference attained, is about the direct support of RILEM, fib, JCI and ACI. Specifically, with regard to the Japanese Concrete Institute, a mention is given to the special session dedicated to the most recent version of "JCI Guidelines for Control of Cracking of Mass Concrete", as it was indeed one of the most inspiring documents that influenced the genesis of COST Action TU1404.

show abstract

“…The only parameter that needs to be updated over time is the corrosion rate measurement. This single parameter captures the most influential impact that stems from several other parameters that tend to be required in models that are more mechanistically definitive [25] [26].…”

Section: Crack Initiation Time Model Developmentmentioning

confidence: 99%

Crack Prediction Model for Concrete Affected by Reinforcement Corrosion

Stefan¹,

Calle²,

Eklund³

et al. 2019

MSA

View full text Add to dashboard Cite

The purpose of this study was to develop an analytical model to predict the time required for cracking of concrete due to corrosion of the iron reinforcement. The concrete and cement specimens used for this study were batched with cover material ranging from 0.75 to 1.3 in (1.91 to 3.30 cm). The extent of cover material was not formulated into the model under the assumption that crack initiation would tend to produce visible cracking within a relatively short time period. The model was derived using both Hooke's Law and the volume expansion induced by the corrosion oxides. Correlation achieved with specimen cracking data from the literature was relatively good with a 95% level of confidence. This model presents a key benefit to facility and infrastructure managers by enabling them to plan the time when corrosion mitigating actions are required. It also provides a significant convenience as the condition of the concrete structure or its environment changes over time. The only parameter that needs to be updated over time is the corrosion rate measurement. This single parameter captures the most influential impact that stems from several other parameters which tend to be required in models that are more mechanistically definitive.

show abstract

A Prediction Method of Tensile Young's Modulus of Concrete at Early Age

Cited by 30 publications

References 10 publications

Alternative Approaches for the Determination of Unconfined Rock Deformation and Strength Properties

Alternative Approaches for the Determination of Unconfined Rock Deformation and Strength Properties

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Crack Prediction Model for Concrete Affected by Reinforcement Corrosion

Contact Info

Product

Resources

About