Shear friction capacity of self-consolidating concrete

Savaris, Gustavo; Pinto, Roberto Caldas de Andrade

doi:10.1590/S1983-41952021000100002

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ORIGINAL ARTICLE • Rev. IBRACON Estrut. Mater. 14 (1) • 2021 • https://doi.org/10.1590/S1983-41952021000100002 copy

Shear friction capacity of self-consolidating concrete

Resistência atrito cisalhamento do concreto autoadensável

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

An experimental research was developed to evaluate shear transfer in self-consolidating. Three concrete mixes were prepared, one conventional and two self-consolidating, differing on the proportion of the coarse and fine aggregate used. Nine push-off specimens, containing steel reinforcement passing through the shear plane, were tested, to evaluate the ultimate shear stress and shear plane displacements. Shear strength of self-consolidating concrete specimens were higher than conventionally vibrated concrete. The experimental results were compared to the shear strength estimated by literature and code based equations, yielding conservative results of these equations for both types of concrete, especially the models that disregard the compressive strength of concretes.

Keywords:
self-consolidating concrete; shear friction; aggregate interlock; push-off

Concrete mixture	Cement	Filler	Natural sand	Artificial sand	Coarse aggregate	Water	Superplasticizer
CC	385.2	-	418.5	417.4	964.6	200.3	-
SCN	385.2	214.7	312.9	312.0	964.6	200.3	0.87
SCR	385.7	215.1	456.5	455.3	676.0	200.6	1.15

Concrete mixture	Slump (mm)	Slump flow (mm)	V-funnel (s)	L-Box	f_c,m (MPa)
CC	105	-	-	-	36.3
SCN	-	665	19.63	0.87	41.2
SCR	-	690	11.94	0.87	47.0

Concrete mixture	Specimen	τ_u (MPa)	τ_u,m (MPa)	Standard deviation (MPa)	τ_un (MPa^0.5)
	A	4.94			0.82
CC	B	4.71	4.95	0.25	0.78
	C	5.20			0.86
	A	5.25			0.82
SCN	B	5.39	5.23	0.18	0.84
	C	5.04			0.79
	A	5.69			0.83
SCR	B	5.62	5.53	0.21	0.82
	C	5.29			0.77

Concrete mixture	τ_un (MPa^0.5)	τ_un,m (MPa^0.5)	Δ_u (mm)	Δ_u,m (mm)	w_u (mm)	w_u,m (mm)
	0.82		0.989		0.167
CC	0.78	0.82	1.056	1.23	0.255	0.24
	0.86		1.641		0.301
	0.82		1.302		0.296
SCN	0.84	0.81	1.541	1.35	0.234	0.28
	0.79		1.22		0.295
	0.83		1.523		0.332
SCR	0.82	0.81	1.367	1.44	0.164	0.28
	0.77		1.421		0.33

Concrete mixture	Specimen	$τ (M P a)$
Concrete mixture	Specimen	$w = 0.10 m m$		$w = 0.15 m m$
	A	0.81		0.82
CC	B	0.72	0.77	0.73	0.79
	C	0.78		0.81
	A	0.78		0.81
SCN	B	0.75	0.74	0.80	0.78
	C	0.71		0.74
	A	0.77		0.80
SCR	B	0.81	0.76	0.82	0.78
	C	0.70		0.71

Concrete mixture	τ_u,exp (MPa)	Birkeland and Birkeland [¹1 P. W. Birkeland, and H. W. Birkeland, "Connections in precast concrete construction," J. Am. Concr. Inst., vol. 63, no. 3, pp. 345–368, 1966.] (MPa)	Mattock [³3 A. H. Mattock, “Shear transfer in concrete having reinforcement at an angle to the shear plane,” ACI SP-42: Shear in Reinforced Concrete, vol. 1, pp. 17–42, 1974.] (MPa)	Vecchio and Collins [⁵5 F. J. Vecchio, and M. P. Collins, "The modified compression field theory for reinforced concrete elements subject to shear," ACI J., vol. 83, pp. 219–231, 1986.]⁽¹⁾ (MPa)	Walraven et al. [⁶6 J. C. Walraven, J. Frenay, and A. Pruijssers, "Influence of concrete strength and load history on the shear friction capacity of concrete members," PCI J., vol. 32, no. 1, pp. 66–84, 1987.] (MPa)	Mattock [⁷7 A. H. Mattock, "Reader comments of paper Influence of concrete strength and load history on the shear friction capacity of concrete members," PCI J., vol. 33, no. 1, pp. 165–166, 1988.] (MPa)
CC	4.95			4.11	4.07	4.24
SCN	5.23	1.98	3.69	4.14	4.30	4.48
SCR	5.53			4.31	4.55	4.74

Concrete mixture	τ_u,exp (MPa)	ACI 318 [¹⁴14 American Concrete Institute, Building code requirements for structural concrete and commentary, ACI 318R-14, 2014.] (MPa)	CAN A23.3 [¹⁵15 Canadian Standards Association, Design of concrete structures, CAN A23.3, 2004.] (MPa)	ACI/τ_u,exp (MPa)	CAN/τ_u,exp (MPa)
CC	4.95		3.90	0.34	0.79
SCN	5.23	1.67	4.16	0.32	0.80
SCR	5.53		4.44	0.30	0.80

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[1] Corresponding author: Gustavo Savaris. E-mail: gsavaris@utfpr.edu.br