Experimental Study of the Shear Strength of Bonded Concrete–Rock Interfaces: Surface Morphology and Scale Effect

Mouzannar, Hussein; Bost, Marion; Leroux, Madly; Virely, Didier

doi:10.1007/s00603-017-1259-2

Cited by 109 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Advances in Materials Science and Engineering of shotcrete-to-rock, comprehensive cooling measures are generally adopted internationally, and the statistics are as shown in Table 3 [55][56][57][58]. According to Table 3, the measures for comprehensive cooling of high-temperature tunnels are as follows: (1) ventilation cooling; (2) spray sprinkling cooling; (3) isolation high-temperature surrounding rock; (4) hot water prevention; (5) working surface artificial cooling and cooling; (6) other cooling measures and monitoring.…”

Section: Comprehensive Coolingmentioning

confidence: 99%

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Duan

Zhang

Lai

2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Long and deep tunnels are increasingly designed and built worldwide, often in severe geothermal environments characterized by high temperature in the rocks. is issue cannot be ignored because high temperature definitely affects the strength of the adhesion between the concrete and the surrounding rocks, whatever the lining cast in place, segmental or sprayed using shotcrete. e causes of geothermal heat and the effect of the temperature on tunnel linings during and after their construction are recalled and discussed in this paper. Both temperature and humidity are shown to be the most relevant factors affecting adhesion strength, whose loss is related to the microdamage in the shotcrete layers closest to the rock. Possible ways to improve adhesion strength and to minimize the high-temperature detrimental effect are also presented and discussed.

show abstract

Section: Comprehensive Coolingmentioning

confidence: 99%

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Duan

Zhang

Lai

2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…The accurate assessment of the shear behavior of concrete‐rock contacts, as those shown in Figure 1A, has long been a major concern being a key factor in the stability of dams, bridge foundations, tunnels or rock bolts (e.g. [1–6]). Concrete‐rock contacts have several similarities with rock joints, 2 the shear strength of which have been the topic of numerous relevant studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[7–15]). However, the mechanical characterization of concrete‐rock contacts is still associated with significant uncertainties due to specificities such as the presence of different materials and in situ conditions 1–3,5,6 . The Mohr‐Coulomb (M‐C) criterion is still widely used to characterize the shear strength of concrete‐rock contacts, although the values of cohesion

c

and friction angle

ϕ

required for this criterion may vary from 0 to 3 MPa and

30^{o}

72^{o}

, respectively, as reported in the literature (e.g., [3–6, 16–22]).…”

Section: Introductionmentioning

confidence: 99%

“…However, the mechanical characterization of concrete‐rock contacts is still associated with significant uncertainties due to specificities such as the presence of different materials and in situ conditions 1–3,5,6 . The Mohr‐Coulomb (M‐C) criterion is still widely used to characterize the shear strength of concrete‐rock contacts, although the values of cohesion

c

and friction angle

ϕ

required for this criterion may vary from 0 to 3 MPa and

30^{o}

72^{o}

, respectively, as reported in the literature (e.g., [3–6, 16–22]). This large variability of cohesion and friction angle, added to the lack of details of actual in situ conditions, may justify the selection of overly simplified assumptions such as: (i) adopting the M‐C criterion with no rigorous account for roughness effects; (ii) ignoring that shear strength measured in the laboratory might differ from in situ conditions; or (iii) assuming a fully unbonded contact, that is, with no chemical cohesion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental, analytical, and finite element assessment of the shear strength of concrete‐rock interfaces at different scales

Renaud

Bouaanani

Miquel

2021

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

This paper presents an original analytical approach to assess the shear strength of concrete‐rock interfaces while accounting for the effects of scale, roughness and matching conditions. The technique proposed is based on experimental data obtained from small core samples extracted from existing dam sites, with diameters varying from 83 to 145 mm, and larger rectangular samples with side lengths comprised between 320 and 492 mm. The predictions of the analytical formulation are validated against results of direct shear tests, as well as 3D nonlinear finite element simulations. Sensitivity analyses are conducted to evaluate the influence of roughness and matching conditions on the shear behavior of concrete‐rock contacts at different scales. The main results show that: (i) roughness inhomogeneity is one of the main causes of scale effects on the shear strength of concrete‐rock interfaces; (ii) contact geometries proportional in both length and height are expected to present quite similar shear strengths; and (iii) geometry matching conditions must be accounted for as they might be the source of scale effects affecting the evaluation of the shear strength at concrete‐rock interfaces. New equations are also proposed to suggest values of apparent cohesion and friction angle for concrete‐rock contacts.

show abstract

“…These factors must be considered in order to increase the bond property. Among these factors, the interface roughness is an im-portant factor affecting the mechanical behaviour of the interface, which affects the bond strength by affecting the cohesion of the interface [18][19].…”

Section: Introductionmentioning

confidence: 99%

The Bond Strength of a Calcium Sulfoaluminate Cement-Based Repair Mortar

Li¹

2019

Ceramics - Silikaty

View full text Add to dashboard Cite

This study investigated the interfacial bond strength between a calcium sulfoaluminate cement (CSA) mortar as a repair material and an old substrate. The surface of the old substrate was treated to have a different roughness (smooth, slightly rough and seriously rough) and moisture. In addition, the effect of a polycarboxylate superplasticiser on the bond properties of the CSA mortar was also studied. The results show that the interface between the CSA mortar and the old substrate is a weak area, and all the test specimens break at the interface. As the interface roughness increases, the bond strength at 4h increases from 1.0 MPa to 3.1 MPa, indicating that the higher interface roughness is beneficial in improving the bond strength. The wet interface has a lower bond strength than the dry interface. Adding an appropriate amount of polycarboxylate superplasticiser is beneficial to improving the bond strength of the mortar. When the polycarboxylate superplasticiser dosage is 0.9 %, the bond strength is the highest.

show abstract

Experimental Study of the Shear Strength of Bonded Concrete–Rock Interfaces: Surface Morphology and Scale Effect

Cited by 109 publications

References 20 publications

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Influence of Ground Temperature on Shotcrete-to-Rock Adhesion in Tunnels

Experimental, analytical, and finite element assessment of the shear strength of concrete‐rock interfaces at different scales

The Bond Strength of a Calcium Sulfoaluminate Cement-Based Repair Mortar

Contact Info

Product

Resources

About