Research on dynamic mechanical properties of alkali activated slag concrete under temperature-loads coupling effects

Long, Wu-Jian; Wei, Jingjie; Gu, Yu-cun; Xing, Feng

doi:10.1016/j.conbuildmat.2017.08.015

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…Only if the AAS was able to demonstrate adequate durability, their intensive use in the construction sector would be possible. Several studies were conducted in the field of rheology [2][3][4], physical performances [5][6][7][8][9][10][11] as well as microstructure [12][13][14] of AAS-based materials but only a limited number of paper concerning the durability of alkali-activated slag-based mortars and concretes was published. In particular, there are not papers that specifically deals with the topic of durability of one-part alkali-activated slag-based mixtures.…”

Section: Introductionmentioning

confidence: 99%

The Durability of One-Part Alkali-Activated Slag-Based Mortars in Different Environments

et al. 2020

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The paper assesses the durability of one-part alkali-activated slag-based mortars (AAS) in different aggressive environments, such as calcium chloride- and magnesium sulphate-rich solutions, in comparison with traditional cementitious mortars at equal water to binder ratio. Moreover, the freezing and thawing resistance was evaluated on mortars manufactured with and without air entraining admixture (AEA). Experimental results indicate that the alkali content is a key parameter for durability of AAS: the higher the alkali content, the higher the resistance in severe conditions. In particular, high-alkali content AAS mortars are characterized by freeze–thaw resistances similar to that of blast furnace cement-based mixtures, but lower than that of Portland cement-mortars while AAS with low activators dosages evidence a very limited resistance in cold environment. The effectiveness of AEA in enhancement of freeze–thaw resistance is confirmed also for AAS mortars. Moreover, AAS mixtures are quasi-immune to expansive calcium oxychloride formation in presence of CaCl2-based deicing salts, but they are very vulnerable to magnesium sulphate attack due to decalcification of C-S-H gel and gypsum formation.

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Section: Introductionmentioning

confidence: 99%

The Durability of One-Part Alkali-Activated Slag-Based Mortars in Different Environments

et al. 2020

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“…The enhancement of several admixtures on damping capability of cement paste was obtained at 30 °C to 120 °C in these studies. According to Liew et al [ 16 ] and Long et al [ 17 ], the damping of cement composites was affected not only by the stress amplitude, but also by factors such as the cross-section shapes, load types, and loading positions. The dynamic behavior of recycled- rubber sand mixtures was studied by Li et al [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Microstructure of Graphene Oxide Nanosheets Reinforced Cement Composites

Long

Wei

et al. 2017

Nanomaterials

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This paper presents an experimental investigation on the effect of uniformly dispersed graphene oxide (GO) nanosheets on dynamic mechanical properties of cement based composites prepared with recycled fine aggregate (RFA). Three different amounts of GO, 0.05%, 0.10%, and 0.20% in mass of cement, were used in the experiments. The visual inspections of GO nanosheets were also carried out after ultrasonication by transmission electron microscope (TEM) atomic force microscope (AFM), and Raman to characterize the dispersion effect of graphite oxide. Dynamic mechanical analyzer test showed that the maximum increased amount of loss factor and storage modulus, energy absorption was 125%, 53%, and 200% when compared to the control sample, respectively. The flexural and compressive strengths of GO-mortar increased up to 22% to 41.3% and 16.2% to 16.4% with 0.20 wt % GO at 14 and 28 days, respectively. However the workability decreased by 7.5% to 18.8% with 0.05% and 0.2% GO addition. Microstructural analysis with environmental scanning electron microscopy (ESEM)/backscattered mode (BSEM) showed that the GO-cement composites had a much denser structure and better crystallized hydration products, meanwhile mercury intrusion porosimetry (MIP) testing and image analysis demonstrated that the incorporation of GO in the composites can help in refining capillary pore structure and reducing the air voids content.

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“…Dynamic mechanical behavior of the mortars was characterized in terms of the loss factor and storage modulus. A higher loss factor indicates a higher phase displacement between the given stress and the measured strain, and therefore an improvement in the damping performance [17]. The storage modulus of the mortar is related to the stiffness and brittleness and is used to characterize Figure 5a shows that the addition of coral sand has a negative effect on the mortar flexural strength, and the flexural strength of the samples is minimum compared to the reference sample SCM-1 when the replacement rate of coral sand (SCM-4) is 100%.…”

Section: Dynamic Mechanical Behaviormentioning

confidence: 99%

Section: Dynamic Mechanical Behaviormentioning

confidence: 99%

“…Recently, Long et al reported that the addition of graphene oxide to cement paste can enhance the dynamic mechanical properties, and clarified its reinforcement mechanism [16]. The dynamic mechanical properties of alkali-activated slag mortar with standard curing were higher than the natural curing at 28 days, and waste rubber tires used as a substitute for fine aggregates can enhance the dynamic mechanical properties of alkali-activated slag mortar, explained by series and parallel model mechanism [15,17]. However, studies about dynamic mechanical properties of coral aggregate cement composites remain scarce.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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Research on dynamic mechanical properties of alkali activated slag concrete under temperature-loads coupling effects

Cited by 24 publications

References 28 publications

The Durability of One-Part Alkali-Activated Slag-Based Mortars in Different Environments

The Durability of One-Part Alkali-Activated Slag-Based Mortars in Different Environments

Dynamic Mechanical Properties and Microstructure of Graphene Oxide Nanosheets Reinforced Cement Composites

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

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