Eco-Efficient Hybrid Cements: Pozzolanic, Mechanical and Abrasion Properties

Shagñay, Segundo; Ramón, Leticia; Fernández-Álvarez, María; Bautista, A.; Velasco, F.; Torres-Carrasco, M.

doi:10.3390/app10248986

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…This means the successive formation of strength-giving phases (C-S-H C-A-S-H, and/or C-N-A-S-H) with time advanced as confirmed by XRD and TG/DTG analyses. The same trend is observed in the previously published reports [ 33 , 59 , 60 ]. Increasing NaOH content within DAS up to 2 wt.% materially improves the early compressive strength (at 7 days).…”

Section: Resultssupporting

confidence: 91%

“…As an innovative approach, the addition of alkalis to high-volume BFS–PC has resulted in the formation of the alkali-activated BSF–PC, namely, hybrid cement (HC) [ 32 , 33 ]. The individual addition of sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) to PC containing 80 wt.% produced hardened materials with compressive strength value 4.5 and 10.8 times, respectively, higher than that of the BFS-PC blend [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

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An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

et al. 2021

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Hybrid cement (HC) can be defined as alkali activated-blended-Portland cement (PC). It is prepared by the addition of an alkaline solution to high-volume aluminosilicate-blended-PC. Although this cement exhibits higher mechanical performance compared to conventional blended one (aluminosilicate–PC blend), it represents lower commercial viability because of the corrosive nature of alkaline solution. Therefore, this study focuses on the preparing one-part HC using dry activator–based BFS (DAS). DAS was prepared by mixing sodium hydroxide (NaOH) with BFS at low water to BFS ratio, followed by drying and grinding to yield DAS-powder. Different contents of DAS (equivalent to 70 wt.% BFS and 1, 2, and 3 wt.% NaOH) were blended with 30 wt.% PC. A mixture containing 70 wt.% BFS and 30 wt.% PC was used as a reference sample. The mortar was adjusted at a sand–powder (BFS-PC and/or DAS-PC) weight ratio of 3:1. The microstructural analysis proved that DAS-powder is mainly composed of sodium calcium aluminosilicate–activated species and unreacted BFS. These species can interact again with water to form calcium aluminum silicate hydrate (C-A-S-H) and NaOH, suggesting that the DAS acts as a NaOH-carrier. One-part HC mortars having 1, 2, and 3 wt.% NaOH recorded 7th day compressive strength values of 82%, 44%, and 27%, respectively, higher than that of the control sample. At 180 days of curing, a significant reduction in compressive strength was observed within the HC mortar having 3 wt.% NaOH. This could be attributed to the increase of Ca (within C-S-H) replacement by Na, forming a Na-rich phase with lower binding capacity. The main hydration products within HC are C-S-H, C-A-S-H, and chabazite as part of the zeolite family.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

et al. 2021

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“…The higher dosage of fibres results in the degradation of abrasion resistance due to the removal of fibres from the surface of the concrete [47,48]. The results also agree with the significant effect of the Na2SiO3 as an alkaline activator which improves abrasion resistance over that of conventional concrete [49,50].…”

Section: Abrasion Resistancementioning

confidence: 61%

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

2021

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The need to develop sustainable concrete in the civil infrastructure industry increases day by day, resulting in new eco-friendly materials such as geopolymer concrete. Geopolymer concrete is one of the eminent alternatives to conventional concrete for sustainable development by reducing the carbon footprint. Ternary blend geopolymer concrete (TGPC) is a sustainable and environmentally friendly concrete produced with three different source materials to form a binder. The main advantage of TGPC is that it possesses densely packed particles of different shapes and sizes, which results in improved properties. This paper deals with the experimental investigations to evaluate the durability properties of plain and hybrid fibre reinforced TGPC. The durability of concrete is defined as the ability to withstand a safe level of serviceability and different environmental exposure conditions without any significant repair and rehabilitation throughout the service life. Conventional concrete is vulnerable to cracking due to its low tensile and durability properties. The TGPC considered in this work consists of fly ash, GGBS and metakaolin as source materials, selected mainly based on the material’s silica and alumina content, shape, size, and availability. The grade of concrete considered was M55. The main variables considered in this study were the proportions of crimped steel fibres (Vf), viz., 0.5% and 1% and proportions of polypropylene fibres (Vp)viz., 0.1%, 0.15%, 0.20% and 0.25%. The durability properties like water absorption, sorptivity, resistance to marine attack, acid attack, sulphate attack, and abrasion were studied in this investigation. The experimental test results were compared with the requirements provided in the standard/literature and found to be well within limits. The study also indicates that the inclusion of fibres in a hybrid form significantly improves the durability parameters of TGPC. The TGPC with 1% steel fibre and 0.15% polypropylene fibre performs better than the other combination of fibres considered in this experimental investigation.

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“…The use of industrial (slag and fly ash) and ceramic waste for complete or partial replacement of Portland cement in the production of both alkali-activated and hybrid cements was proposed in [27]. The slag, activated by liquid glass, showed the highest mechanical strength and lowest porosity, but hybrid materials also showed competitive results [27].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mechanochemical Activation of Concrete Components on the Properties of Vibro-Centrifugated Heavy Concrete

et al. 2021

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One of the crucial problems in current construction is energy, resource, and material efficient technologies in both industrial and civil engineering, associated with new material manufacturing and building construction. This article is devoted to developing comprehensive technology for activation effects on concrete made by various production techniques: vibration, centrifugation, and vibro-centrifugation. The possibility of a significant improvement in the microstructure of concrete and obtaining materials with increased specified characteristics, depending on its manufacturing technology, were studied during the complex activation effect exposed to this concrete and its components. Chemical activation of water and mechanical activation of cement were considered. The urgency and prospects of double, complex mechanochemical activation of concrete mixture components were substantiated. It was proven that the complex mechanochemical activation of the concrete mixture components gives a synergistic effect in obtaining concrete composition with an improved structure and improved characteristics. Furthermore, the relationship between concrete production technology and the technology of activation of its components was established. It was revealed that the most effective is the complex mechanochemical activation of vibro-centrifuged concrete, which gives an increase in strength up to 30%. The study results indicate a further direction of development associated with an increase in variatropic characteristics using both prescription and technological factors.

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Eco-Efficient Hybrid Cements: Pozzolanic, Mechanical and Abrasion Properties

Cited by 20 publications

References 28 publications

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

An Innovative Method for Sustainable Utilization of Blast-Furnace Slag in the Cleaner Production of One-Part Hybrid Cement Mortar

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

Influence of Mechanochemical Activation of Concrete Components on the Properties of Vibro-Centrifugated Heavy Concrete

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