Avaliação experimental de métodos acelerados de determinação do coeficiente de difusão de cloretos no concreto

Sell Junior, Félix Krolow; Wally, Gustavo Bosel; Teixeira, Fernando Ritiéle; Magalhães, Fábio Costa

Félix Krolow Sell Junior

Universidade Federal de Pelotas – UFPel, Centro de Desenvolvimento Tecnológico, Programa de Pós-graduação em Ciência e Engenharia de Materiais, Pelotas, RS, Brasil

https://orcid.org/0000-0002-6286-5371

Gustavo Bosel Wally

Universidade Federal do Rio Grande do Sul – UFRGS, Programa de Pós-graduação em Engenharia Civil, Porto Alegre, RS, Brasil

Instituto Federal de Ciência e Tecnologia do Rio Grande do Sul – IFRS, Laboratório de Estruturas e Materiais de Construção Civil, Rio Grande, RS, Brasil

https://orcid.org/0000-0003-3008-3815

Fernando Ritiéle Teixeira

Universidade Federal de Pelotas – UFPel, Centro de Desenvolvimento Tecnológico, Programa de Pós-graduação em Ciência e Engenharia de Materiais, Pelotas, RS, Brasil

Instituto Federal de Ciência e Tecnologia do Rio Grande do Sul – IFRS, Laboratório de Estruturas e Materiais de Construção Civil, Rio Grande, RS, Brasil

https://orcid.org/0000-0001-8498-9263

Fábio Costa Magalhães

Instituto Federal de Ciência e Tecnologia do Rio Grande do Sul – IFRS, Laboratório de Estruturas e Materiais de Construção Civil, Rio Grande, RS, Brasil

Universidade Federal de Rio Grande – FURG, Escola de Engenharia, Programa de Pós-graduação em Engenharia Oceânica, Rio Grande, RS, Brasil

https://orcid.org/0000-0001-8463-1501

Corresponding author: Gustavo Bosel Wally. E-mail: gustavo.wally@gmail.com

Conflict of interest: Nothing to declare.

Author contributions: FKSJ: conceptualization, methodology, formal analysis, writing; GBW: methodology, data curation, formal analysis, writing; FRT: conceptualization, methodology; FCM: conceptualization, methodology, formal analysis, writing, supervision;

Editors: Fernando Pelisser Guilherme Aris Parsekian.

Parameter	Fine sand	Medium sand	Coarse aggregate
Fineness modulus	1.64 ^a	2.42 ^a	6.71 ^a
Maximum diameter (mm)	2.40 ^a	2.40 ^a	12.50 ^a
Specific gravity (g/cm³)	2.67 ^b	2.65 ^b	2.65 ^c
Loose unit mass (g/cm³)	1.39 ^d	1.53 ^d	1.46 ^d

Component	SiO₂	K₂O	CaO	Fe₂O₃	MnO	Others
Content (%)	88.32	6.14	4.35	0.68	0.39	0.12

Mix	w/b ratio	Material consumption (kg/m³)
Mix	w/b ratio	Cement	Silica fume	Fine sand	Medium sand	Coarse aggregate
R 45	0.45	400.00	0.00	128.00	512.00	960.00
SF 5	0.45	380.00	20.00	128.00	512.00	960.00
SF 10	0.45	360.00	40.00	128.00	512.00	960.00
SF 20	0.45	320.00	80.00	128.00	512.00	960.00
R 55	0.55	383.00	0.00	122.56	490.24	919.20
R 65	0.65	367.00	0.00	117.44	469.76	880.80

Point	P1	P2	P3	P4	P5	P6	P7
Depth (mm)	0-2	2-5	5-8	8-11	11-14	14-17	17-20

Mix	$f_{c m}$ (MPa)	Capillary water absorption after 72 h (g/cm²)
R 45	63.22	1.15
SF 5	63.46	1.04
SF 10	70.88	1.01
SF 20	74.51	0.91
R 55	46.57	1.35
R 65	40.60	1.77

Mix	$D_{a}$ ( $\times$ 10^-12 m²/s)	Resistance to chloride penetration [³⁵35 L. Nilsson, M. H. Ngo, and O. E. Gjørv, "High-performance repair materials for concrete structures in the port of Gothenburg", in Proc. 2nd Int. Conf. Concr. Under Severe Conditions: Environment and Loading, Sapporo, 1995, pp. 1193–1198.]
R 45	3.23	Very high
SF 5	2.85	Very high
SF 10	1.91	Extremely high
SF 20	1.81	Extremely high
R 55	7.99	High
R 65	13.48	Moderate

Mix	$D_{n s s m}$ ( $\times$ 10^-12 m²/s)	Resistance to chloride penetration [³⁵35 L. Nilsson, M. H. Ngo, and O. E. Gjørv, "High-performance repair materials for concrete structures in the port of Gothenburg", in Proc. 2nd Int. Conf. Concr. Under Severe Conditions: Environment and Loading, Sapporo, 1995, pp. 1193–1198.]
R 45	2.85	Very high
SF 5	1.75	Extremely high
SF 10	0.90	Extremely high
SF 20	0.20	Extremely high
R 55	4.76	Very high
R 65	6.02	High

Mix	Time-lag (h)	Ions flux ( $\times$ 10^-10 mol/(cm² $\times$ s))	$D_{s}$ ( $\times$ 10^-12 m²/s)	$D_{n s}$ ( $\times$ 10^-12 m²/s)	Resistance to chloride penetration ( $D_{n s})$ [³⁵35 L. Nilsson, M. H. Ngo, and O. E. Gjørv, "High-performance repair materials for concrete structures in the port of Gothenburg", in Proc. 2nd Int. Conf. Concr. Under Severe Conditions: Environment and Loading, Sapporo, 1995, pp. 1193–1198.]
R 45	465	4.37	0.83	2.26	Extremely high
SF 5	485	3.32	0.63	2.17	Extremely high
SF 10	585	2.88	0.55	1.80	Extremely high
R 55	410	6.01	1.15	2.57	Very high
R 65	315	9.54	1.82	3.34	Very high

[1] Corresponding author: Gustavo Bosel Wally. E-mail: gustavo.wally@gmail.com

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Avaliação experimental de métodos acelerados de determinação do coeficiente de difusão de cloretos no concreto

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