Experimental assessment of accelerated test methods for determining chloride diffusion coefficient in concrete

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

doi:10.1590/S1983-41952021000400007

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

Brasil

Brasil

Experimental assessment of accelerated test methods for determining chloride diffusion coefficient in concrete

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

Abstract