Laboratory evaluation of cement-based grouts and grouted rock anchors

Benmokrane, Brahim; Chennouf, Adil; Mitri, Hani S.

doi:10.1016/0148-9062(95)00021-8

Cited by 213 publications

(98 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Yazici and Kaiser [9] emphasized the effect of dilatancy effect on the ultimate bond strength of the anchorage interface and developed the bond strength model (BSM) in 1990s. Short later, Benmokrane et al [10] studied the stress distribution and evolution law of the anchorage interface by field and laboratory pull-out tests and then proposed a trilinear bondslip model for the interfacial mechanism between the bolt and grout. More recently, Li and Stillborg [11] introduced the notion of "decoupling front" and presented an analytical model through pull-out test; the model considered the decoupling mechanism, and the shear stress is assumed to be zero when the interface is completely decoupled.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Zhao

Xiaofei

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

is paper presents an analysis of bamboo bolt-modified slurry interfaces based on 26 in situ axial pull-out tests intended to highlight the mechanical behavior of interface under a fracture mode. ree impact factors are analyzed: anchorage length, bolt diameter, and bolt hole diameter, using the same materials of bamboo and modified slurry. e result shows that the interface between the bamboo bolt and anchoring agent is the control interface of an anchorage system, and the local behavior of the interface involves four stages: elastic, soften, friction, and decoupling. Distribution law and change trend of slippage, stress, and strain of anchoring interface along with the axial direction of an anchor bolt were analyzed. e result shows that there is effective anchoring length limit in this kind of interface, and that the complete decoupling phenomenon should not be neglected. rough a comparative analysis of the existing bond-slip model and interface bond-slip curve, and considering the correspondence of the strain-slip curve and trilinear bond-slip model simultaneously, a modified trilinear bond-slip model has been proposed. e friction section of this model is limited, and shearing stress in the complete decoupling section is zero.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Zhao

Xiaofei

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Il s'agit donc d'un modèle à trois phases, similaire à celui proposé par Benmokrane et al (1995) ; cependant, la deuxième phase est non linéaire pour mieux reproduire les résultats expérimentaux.…”

Section: Exemple D'applicationunclassified

“…Au-delà, le cisaillement décroît de façon exponentielle jusqu'à l'extrémité libre de la barre (i.e., pas de décohésion), de façon similaire au modèle proposé par Farmer (1975). Benmokrane et al (1995) ont proposé un modèle trilinéaire entre la contrainte de cisaillement et le glissement tangentiel à l'interface. La première partie du modèle, à pente positive, représente l'élasticité de l'interface ; la deuxième partie, à pente négative, en représente l'endommagement et la dernière partie, à palier constant, tient compte d'une résistance résiduelle due au frottement.…”

Section: Introductionunclassified

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

et al. 2016

View full text Add to dashboard Cite

Résumé -Dans cet article, nous étudions l'interface barre-scellement du boulonnage/câblage à ancrage réparti. L'application d'un effort de traction sur la barre permet d'examiner le phénomène de décohésion de l'interface. Des études expérimentales et théoriques ont été menées, en conditions statiques. Les études théoriques sont utiles pour convertir les variables observables dans les matériaux environnants (barre, scellement, terrain) en variables d'interface, non accessibles directement. Les études expérimentales, effectuées en laboratoire et in situ, permettent de déterminer les facteurs les plus influents sur la réponse de l'interface. La combinaison de ces deux études constitue une méthode d'accès à la réponse de l'interface barre-scellement. Un exemple d'application de la nouvelle méthode est détaillé pour une configuration en laboratoire. L'analyse de plusieurs interfaces suggère que la réponse tangentielle n'est pas seulement due au frottement et que la réponse radiale dépend fortement du profil de la barre.Mots clés : Boulonnage à ancrage réparti / interface barre-scellement / approche analytique / essai d'arrachement / formulation semi-empirique / modèle d'interface Abstract -Fully grouted bolts: assessment of the bolt-grout interface response under axial loads. In this paper, we investigate the bolt-grout interface of fully grouted bolts. To study the interface debonding process, an axial tensile load is applied on the bar. Experimental and theoretical investigations have been conducted, in static conditions. The theoretical studies allow converting the variables measured in the surrounding materials (bolt, grout, ground) in interface variables, which cannot be measured directly. The experimental studies have been carried out at laboratory and field scales. They are useful to determine the most influencing parameters on the interface response. The combination of the theoretical developments with the experimental results leads to a method to access the bolt-grout interface response. An application example of the new method is detailed for a laboratory set-up. The analysis of several interfaces suggests that the tangential response is not only due to friction and that the normal response is highly dependent on the bolt profile.

show abstract

“…Generally, the cement-grouted anchors can exhibit a reduction in load-carrying capacity in the case of an uncleaned hole [3]. Studies have shown that the in-situ mechanical and elastic properties of the grout have an important effect on the development of bond strength [4,5]. Such properties can be compromised when the grout is cast under water.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of cement grouts for embedding anchors under water

1998

Self Cite

View full text Add to dashboard Cite

Approximately 110 pull-out tests were conducted on grouted anchors cast in the laboratory to investigate the effects of the rheological and mechanical properties of cement grouts, the initial free drop distance of grout, as well as the age of testing on the behavior of anchorages cast in dry and submerged conditions. The anchors consisted of 19-ram, conventional steel bars with an embedment length fixed at five times the bar diameter. Two different casting procedures corresponding to initial free drop of the grout in water of 20 and 200 mm were investigated. The cement grouts used in this investigation incorporated either a Type 10 or a blended silica fume cement and a fixed water-binder ratio of 0.40. The grouts incorporated various concentrations of a high-range water reducer, a rheology-modifying admixture, and silica fume. The rheology-modifying admixture and high-range water reducer were jointly incorporated to enhance both fluidity and washout resistance.The test results indicate that properly designed grouts can be easily cast into place, and yet be cohesive enough to resist the washout ofcementitious materials. The spread in load-carrying capacity between anchor bars cast in dry versus submerged conditions can decrease when cement grouts having a greater washout resistance level are used which can be secured by incorporating a rheology-modifying admixture and silica fume. The bond strength is shown to increase when incorporating silica fume regardless of the casting condition. RESUME Des essais d'arrachement ont ~t~ r&lis& en laboratoire afin d'&udier l'effet des propriSt& rh&logiques et

show abstract

Laboratory evaluation of cement-based grouts and grouted rock anchors

Cited by 213 publications

References 3 publications

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

Evaluation of cement grouts for embedding anchors under water

Contact Info

Product

Resources

About