Wear behavior in pastes of alkali-activated materials: Influence of precursor and alkali solution

Shagñay, Segundo; Velasco, F.; Campo, Adolfo del; Torres-Carrasco, M.

doi:10.1016/j.triboint.2020.106293

Cited by 14 publications

(5 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This indicates that the positive effect of both gels and using 5% of Na 2 SO 4 promotes the best results (wear improvement was around 42% compared to the CEM I system) as the compactness of the gel is improved (previously found in other properties, Figure 4). In addition, observing the results obtained on porosities, a clear relationship between these parameters is presented since, in general, materials with higher porosities have shown greater volume losses [20]. It should be noted that the hybrid mortar with porcelain waste (HPT-5%), though it did not obtain a high mechanical resistance, showed a notable improvement in terms of durability to wear.…”

Section: Durability To Wear: Bö Hme Testmentioning

confidence: 80%

“…However, on the other hand, it is important to highlight that the alkaline-activated system with NaOH (AAS-N) presented good mechanical behavior, but after the Böhme test, it was among the systems that presented the worst performance. As studied in previous works [20], using alkaline solutions that present efflorescence phenomena means that after wear with a counter material, there is a greater loss of mass and a greater wear mark is generated.…”

Section: Durability To Wear: Bö Hme Testmentioning

confidence: 91%

See 1 more Smart Citation

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

et al. 2020

View full text Add to dashboard Cite

One of the most polluting industries is the cement industry and, for this reason, alternative lines of research recommend the use of substitute materials for traditional Portland cement. This study proposes the use of industrial (slag and fly ash) and ceramic wastes for the total or partial replacement of Portland cement in the manufacturing of both alkaline-activated and hybrid cements. To carry out this study and evaluate the behavior of the proposed materials, different mortars were manufactured: Portland cement (CEM I), two alkaline-activated slag systems and six hybrid systems, with an 80–20% waste-to-Portland-cement ratio for all the proposed wastes. An assessment of the pozzolanic activity was carried out for the different materials. The behavior of all the systems regarding mechanical resistance and durability to abrasion was studied. All the proposed materials, especially those with ceramic wastes, showed pozzolanic activity and suitable characteristics for use in the manufacturing of alternative cements. The mortar made of slag activated with waterglass presented the highest mechanical strength and lowest porosity, but the hybrid materials presented competitive results. After being subjected to the Böhme abrasion test, their effectiveness as substitutes for Portland cement is reiterated, some of them improving their durability to wear.

show abstract

Section: Durability To Wear: Bö Hme Testmentioning

confidence: 80%

Section: Durability To Wear: Bö Hme Testmentioning

confidence: 91%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…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 Na 2 SiO 3 as an alkaline activator which improves abrasion resistance over that of conventional concrete [49,50].…”

Section: Abrasion Resistancementioning

confidence: 60%

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

2021

View full text Add to dashboard Cite

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.

show abstract

“…Therefore, adding basalt fibers to the absorbing concrete pavement structure can effectively improve its wear resistance performance. Alkaliactivated materials (AAMs), an alternative to Portland cement, have demonstrated favorable wear performance compared to Portland cement [34]. Ahmed et al [35] discovered that an optimal content of 1% by weight of cement demonstrated improved abrasion resistance and durability, and met the main requirements of concrete highway pavement, including strength and workability.…”

Section: Wear Resistancementioning

confidence: 99%

Properties of Concrete Reinforced with a Basalt Fiber Microwave-Absorbing Shielding Layer

Jiang,

Song,

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

The purpose of this study was to propose a highly efficient, durable, and environmentally friendly method for the rapid removal of ice and snow. A microwave-absorbing functionality layer was placed between a conductive metal mesh and magnetite sand shielding layer, and ordinary cement concrete (OC). Microwave heating, mechanical strength determination, and indoor and outdoor de-icing tests were performed on the cement concrete specimens with the shielding layer. Basalt fibers were added to the absorbing functionality layer, and the formed specimens were tested for strength and durability. The microstructure was observed using SEM experiments. The results show that the temperature rise of microwave-absorbing cement concrete with a magnetite sand shielding layer (MCMS) and microwave-absorbing cement concrete with a conductive metal mesh shielding layer (MCMM) increased by approximately 17.2% and 27.1%, respectively, compared to that of microwave-absorbing concrete (MAC). After freeze–thaw cycles, the compressive strength and flexural strength of microwave-absorbing concrete with basalt fiber (MAB) increased by 4.35% and 7.90% compared to those of MAC, respectively. The compressive strength and flexural strength of microwave-absorbing concrete with a magnetite sand shielding layer and basalt fiber (MAMB) increased by 8.07% and 6.57%, respectively, compared to those of MCMS. Compared to specimens without basalt fiber, the wear rate per unit area of MAMB decreased by 8.8%, and the wear rate of MAB decreased by 9.4%. The water absorption rate of MAMB specimens decreased by 13.1% and 12.0% under the conditions of 20 and 40 microwave freeze–thaw cycles, respectively, compared to that of MCMS. The water absorption rate of MAB specimens decreased by 9.9% and 8.3% under the conditions of 20 and 40 microwave freeze–thaw cycles, respectively, compared to that of MAC. SEM analysis showed that the addition of basalt fibers improved the compactness and stability of the cement concrete structure as a whole. This study provides valuable references for the promotion and application of microwave de-icing technology.

show abstract

Wear behavior in pastes of alkali-activated materials: Influence of precursor and alkali solution

Cited by 14 publications

References 54 publications

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

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

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

Properties of Concrete Reinforced with a Basalt Fiber Microwave-Absorbing Shielding Layer

Contact Info

Product

Resources

About