Open Journal Systems

Experimental Evaluation of Steel–Concrete bond Strength in Low-cost Self-compacting Concrete

Mohamed Abd Elaziz Safan, Mounir M Kamal, Mohamed A Al-gazzar

Abstract


The main objective of this research was to evaluate the potentials of self-compacting concrete (SCC) mixes to develop bond strength. The investigated mixes incorporated relatively high contents of dolomite powder replacing Portland cement. Either silica fume or fly ash was used along with the dolomite powder in some mixes. Seven mixes were proportioned and cast without vibration in long beams with 10 mm and 16 mm steel dowels fixed vertically along the concrete flow path. The beams were then broken into discrete test specimens. A push-out configuration was adopted for conducting the bond test. The variation of the bond strength along the flowing path for the different mixes was evaluated. The steel-concrete bond adequacy was evaluated based on normalized bond strength. The results showed that the bond strength was reduced due to Portland cement replacement with dolomite powder. The addition of either silica fume or fly ash positively hindered further degradation as the dolomite powder content increased. However, all SCC mixes containing up to 30% dolomite powder still yielded bond strengths that were adequate for design purpose. The test results demonstrated inconsistent normalized bond strength in the case of the larger bar diameter compared to the smaller one.


Keywords


self-compacting concrete; bond; pull-out; push-out; filler; dolomite powder

Full Text:

PDF

References


Ozawa K, Maekawa K, Kunishima M, and Okamura H, High performance concrete based on the durability design of concrete structures. Proceedings East Asia Pacific conference on Structural Engineering (EASEC 2), Chiang Mai, Thailand: 1989.

Chan KD, Ong KCG and Tam CT, Passing ability of SCC – improved method based on the P-Ring. Proceedings of the 35th conference on Our World in Concrete and Structures, Singapore, August, (2010): 9 p.

ACI Committee 232, Use of fly ash in concrete. ACI 232.2R-03 (2003): 41 p.

ACI Committee 234, Guide for the use of silica fume in concrete. ACI 234R-06: 63 p.

Dunster A, Silica fume in concrete. BREPress, Watford, UK (2009): 12 p.

Kamal MM, Safan MA, and Al-Gazzar MA, Blended Portland cements for low-cost selfcompacting concrete. Proceedings of the 1st International Conference "New Cements and their Effects on Concrete Performance" National Housing and Building and Research Center (HBRC) and Helwan University, Cairo, Egypt, (2008): 14 p.

Al-Gazzar M A, Low-cost self-compacting Concrete. PhD Thesis, Menoufia University, Egypt (2009): 243 p.

Safan MA, Shear strength of concrete beams cast with self-compacting concrete containing different fillers and coarse aggregates. Canadian Journal of Civil Engineering, 2012, 38(7): in press.

Safan MA, Performance of beams cast with low-cost self-compacting concrete in aggressive environment. Acta Polytechnica, 2011, 51(5): 120-130.

ECP 203-2007, Egyptian code for the design and construction of reinforced concrete structures. National Building and Research Center (HBRC), Cairo, Egypt, 2007: 352 p.

Assié S, Escadeillas G, and Waller V, Estimates of self-compacting concrete potential durability. Construction and Building Materials, 2007, 21: 1909-1917.

BS 5328-1, Concrete: Guide to specifying concrete. British Standard Institution, 389 Chiswick High Road, London, W4- 4Al, UK, 1997: 32p.

BS 8500, Concrete: Complementary British Standard to BS EN 206-1, Part 1: method of specifying and guidance for the specifier, 66p., and Part 2: Specifications for constituent materials and concrete. British Standards Institution, 389 Chiswick High Road, London, W4-

Al, UK, 2002, 2006.

BRE Special Digest-1, Concrete in aggressive ground. Building Research Establishment (BRE), Watford, UK. Publisher: HIS Rapidoc, Willoughby, Bracknall, Berks, RG12-8DW, 2005.

CSA A23.1, Concrete materials and methods of concrete construction. Canadian Standards Association, Canada, 2009: 420 p.

ACI Committee 408, Bond and development of straight reinforcing bars in tension. ACI 408R-03, 2003: 49 p.

FIB Bulletin 10, Bond of reinforcement in concrete. State-of-the-art Report, FIB Bulletin 10, Switzerland, 2000: 427p.

De Almeida FM, De Nardin S, and El-Debs ALHC, Evaluation of the bond strength of selfcompacting concrete in pull-out tests. Proceedings of the 2nd North American conference on the Design and Use of Self-Consolidating Concrete and 4th International RILEM Symposium

on Self-Compacting Concrete. Chicago, 2005: 44-55.

Chan YW, Chen YS, and Liu YS, Development of bond strength of reinforcing steel in selfconsolidation concrete. ACI Structure Journal, 2003, 100(4): 490–498.

Daoud A, Lorrain M, and Laborderie C, Anchorage and cracking behavior of self-compacting concrete. Proceedings of third RILEM International Symposium on Self-Compacting Concrete, Wallevik O, and Nielsson I Editors, Reykjavik Iceland, RILEM Publications, PRO 33, Bagneux, France, 2003.

Zhu W, Sonebi M, and Bartos PJM, Bond and interfacial properties of reinforcement in selfcompacting concrete. Materials and Structures, 2004, 37: 442–448.

Turk K, Karatas M, and Ulucan Z, Effect of the use of different types and dosages of mineral additions on the bond strength of lap-spliced bars in self-compacting concrete. Materials and Structures, 2010, 43: 557-570.

BS-EN 197-1, Cement: composition, specifications, and conformity criteria for common cements. British Standard Institution, 389 Chiswick High Road, London, W4- 4Al, UK, 2000:52 p.

ASTM C618, Specification for fly ash and raw calcined natural pozzolan for use as a mineral admixture in Portland cement concrete. Annual Book for ASTM Standards, 2000, 4:4 p.

ASTM C494, Standard specification for chemical admixtures for concrete. 1999: 9 p.

Foroughi-Asl A, Dilmaghani S, and Famili H, Bond strength of reinforcement steel in selfcompacting concrete. International Journal of Civil Engineering, 2008, 6(1): 24-33.

ACI 318R-08, Building code requirements for structural concrete (318-08) and commentary.ACI Committee 318, 2008: 471p.

Domone PL, A Review of the hardened mechanical properties of self-compacting concrete.Cement and Concrete Composites, 2007, 29: 1-12.

Menezes F, El Debs MK, and El Debs AL, Bond-slip behavior of self-compacting concrete and vibrated concrete using pull-out and beam tests. Materials and Structures, 2008, 41:1073-1089.

Sonebi M, and Bartos PJM, Hardened SCC and its bond with reinforcemen. Proceedings of the First International RILEM Symposium on "Self-compacting concrete", Skarendahl, A. and Petersson, O. Editors, 1999.

Khan MS, Reddy AR, Shariq M, and Prasad J, Studies in bond strength in RC flexural members. Asian Journal of Civil Engineering (Building and Housing), 2007, 8(1): 89-96


Refbacks

  • There are currently no refbacks.