Evaluation of high-strength cementitious composite with iron ore tailing and gneiss waste as mineral admixture

Fajardo, Abner Araújo; Souza, Sílvia Roberta; Prado, Dyala Fraga do; Macedo, Jordana Gonçalves de; Lanna, Vinicius Ferreira; Aguilar, Maria Teresa Paulino; Garcia, Dayana Cristina Silva; Barbosa, Maria Teresa Gomes; Almeida, Fernando do Couto Rosa; Santos, White José dos

doi:10.1590/s1678-86212025000100915

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Special edition: the best papers of ENTAC 2024 • Ambiente Construído 25 • 2025 • https://doi.org/10.1590/s1678-86212025000100915 linkcopy

Evaluation of high-strength cementitious composite with iron ore tailing and gneiss waste as mineral admixture

Avaliação de compósito cimentício de alta resistência com rejeito de minério de ferro e resíduo de gnaisse como adições minerais

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This study aimed to evaluate the physical-mechanical properties, electrical resistivity and microstructural characteristics of high-strength cementitious composites (HSCC) incorporating iron ore tailings (IOT) and quarry residue (gneiss powder - GN) at 28 and 180 days. The results showed that IOT and GN samples exhibited high compressive strength (> 90 MPa) and flexural strength (> 6 MPa). Little difference was identified regarding the hydrated phases. In the interfacial transition zone, the IOT and GN samples presented low pore content and reduced extension. It was concluded that high-strength cementitious composites with excellent physical and mechanical and durability performance could be developed using a mixture design based on particle packing and the incorporation of IOT and GN.

Key words
Iron Ore Tailings (IOT); Gneiss waste; Mineral admixture; High-strength cementitious composite; Microstructure

Sample	Cement (kg/m³)	Sand (kg/m³)	Silica Fume (kg/m³)	IOT (kg/m³)	GN (kg/m³)	Water (kg/m³)	Superplasticizer (kg/m³)
Ref.	507	1520	127	0	0	190	10
IOT	479	1437	120	192	0	180	14
GN	469	1407	117	0	188	176	14

Physical properties	Diameter	Silica fume	IOT	GN	Cement
Particle size (µm)	D₁₀	3.76	0.43	3.28	7.30
	D₅₀	13.74	3.63	32.62	28.00
	D₉₀	24.41	12.90	87.79	47.00
Specific gravity (g/cm³)		2.20	3.84	2.70	3.12
Specific surface area (m²/g)		22,010	35,113	2,240	1,743
Pore Volume (10^-3 cm³/g)		1.901	0.5712	6.725	5.896

Oxide	Silica fume	IOT	GN	Cement
Fe₂O₃	13.60	69.90	3.72	3.08
SiO₂	61.00	19.20	70.50	18.20
Al₂O₃	11.30	3.46	14.30	4.37
CaO	3.44	0.22	3.18	60.90
MgO	1.86	0.10	1.60	0.60
TiO₂	0.91	0.10	0.39	0.24
P₂O₅	0.36	0.10	0.14	0.25
Na₂O	0.70	0.10	3.85	0.15
K₂O	2.31	---	2.85	0.68
MnO	0.26	0.15	0.05	0.07
SO₃	---	---	---	3.96
LOI	5.27	5.75	0.89	6.62

Sample	Cement	Sand	Silica Fume	IOT	GN	Water	Superplasticizer
IOT	1.000	3.000	0.250	0.400	0.000	0.375	0.030
GN	1.000	3.000	0.250	0.000	0.400	0.375	0.030
Ref.	1.000	3.000	0.250	0.000	0.000	0.375	0.020

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