Study of red ceramic residues as pigments in matrices based on white Portland cement

Dias, Letícia Andreolli; Birck, Fernanda Boll; Kaefer, Lucas; Arnold, Daiana Cristina Metz; de Vargas, Alexandre Silva

doi:10.1590/S1983-41952021000600008

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ORIGINAL ARTICLE • Rev. IBRACON Estrut. Mater. 14 (6) • 2021 • https://doi.org/10.1590/S1983-41952021000600008 copy

Study of red ceramic residues as pigments in matrices based on white Portland cement

Estudo de resíduos de cerâmica vermelha como pigmentos em matrizes de cimento Portland branco

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The present study evaluated the use of red ceramic residues (RCR) as pigments in matrices based on White Portland cement. Five mortars were prepared for the present study: control mortar (M0), at 1:2,3 ratio (cement: sand) and water/cement ratio of 0.60, other four mortars were prepared containing RCR in 10% (M10), 20% (M20), 50% (M50), 100% (M100) of volume in replace to the sand. Colorimetric tests indicated a significant increase in the coloring, due to the increase of the RCR used. Tests of resistance to compression strength indicated a significant increase in the results as there was an increase in the substitution content of the sand by RCR. In the flexural tensile strength was no significant influence for contents of up to 50%. Therefore, the RCR showed potential as a pigmentation product and can contribute to the increase in compressive strength in Portland cement-based matrices.

Keywords:
sand; pigments for mortar; red ceramic residues

	White Portland Cement	Sand
Specific mass	2,97 g/cm³	-
Fineness- residue on the sieve of 75μm	0,3%	-
Fineness- residue on the sieve of 45μm	1%	-
Unit mass	-	1,615 g/cm³
Finesse module	-	2,19
Maximum grain size (mm)	-	2,4mm

Assay	% of mass
SiO₂	20,86
Al₂O₃	4,16
Fe₂O₃	0,24
CaO	63,3
MgO	1,17
SO₃	2,89
Na₂O	0,10
K₂O	0,43
TiO₂	0,21
SrO	0,04
P₄O₁₀	0,04
MnO2	0,02
CaO	1,79
Insoluble residue	0,57
CO₂	3,99
Equivalent Alkaline in Na₂O	0,38

Matrix	Cement (kg)	Sand (kg)	Residue of RCR (kg)		Additive content (%)	Flow table (mm)
M0	0,850	1,955	0	0,51	0	292
M10	0,850	1,7595	0,1017	0,51	0	281
M20	0,850	1,564	0,2034	0,51	0	297
M50	0,850	0,9775	0,7206	0,51	0	289
M100	0,850	0	1,0168	0,51	3,85	260

Variation source	SS	DF	AS	Testing F	value – p		Significant Effect
Environment of cure (EC)	0,876	1	0,876	0,654	0,464	7,709	No

EC*Residue percentage	500,29	4	125,07	93,374	0,000	6,388	Yes

Variation source	SS	DF	AS	Testing F	Value – p	Critical F	Significant Effect
Environment of cure (EC)	1,176	1	1,176	1,584	0,277	7,709	No

EC*Residue percentage	522,05	4	130,51	175,765	0,000	6,388	Yes

Variation source	SS	DF	AS	Testing F	Value – p	Critical F	Significant Effect
Hydration time (HT)	0,229	1	0,229	9,185	0,039	7,708	Yes

HT*Residue percentage	4,370	4	1,092	43,722	0,001	6,388	Yes

Variation source	SS	DF	AS	Testing F	Value – p	Critical F	Significant Effect
Hydration time (HT)	0,133	1	0,133	0,701	0,449	7,708	No

HT*Residue percentage	2,947	4	0,737	3,887	0,108	6,388	No

Variation source	SS	DF	AS	Testing F	Value – p	Critical F	Significant Effect
Up to 50% RCR content	0,564	3	0,188	0,419	0,744	4,066	No

All RCR levels	28,580	4	7,145	16,272	0,000	3,478	Yes

Class	Tensile Strength MPa	Method of testing
R1	≤ 1,5	ABNT NBR 13279
R2	1,0 to 2,0
R3	1,5 to 2,7
R4	2,0 to 3,5
R5	2,7 to 4,5
R6	>3,5

Variation source	SS	DF	AS	Testing F	Value – p	Critical F	Significant Effect
Residue percentage	2.459,947	4	614,987	70,294	0,00	2,759	Yes

Class	Compressive strength MPa	Method of testing
P1	≤ 2,0	ABNT NBR 13279
P2	1,5 to 3,0
P3	2,5 to 4,5
P4	4,0 to 6,5
P5	5,5 to 9,0
P6	> 8,0

Content (%)	Compression strength (MPa)		Tensile Strength (MPa)	Average detour (Rt)
0	40,31	1,32	7,17	0,22
10	40,23	1,05	7,19	0,35
20	46,19	0,92	7,62	0,33
50	48,57	4,29	7,03	0,79
100	64,94	2,05	3,84	0,64

IBRACON - Instituto Brasileiro do Concreto Instituto Brasileiro do Concreto (IBRACON), Av. Queiroz Filho, nº 1700 sala 407/408 Torre D, Villa Lobos Office Park, CEP 05319-000, São Paulo, SP - Brasil, Tel. (55 11) 3735-0202, Fax: (55 11) 3733-2190 - São Paulo - SP - Brazil
E-mail: arlene@ibracon.org.br

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[1] Corresponding author: Letícia Andreolli Dias. E-mail: leticia.dias.nh@hotmail.com