Study on dynamic mechanical properties of carbon nanotubes reinforced concrete subjected to freeze–thaw cycles

Song, Shushuang; Niu, Yanning; Zhong, Xin

doi:10.1002/suco.202100464

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…In other efforts, some researchers studied the synergic effects of NS together with other additives, such as ground granulated blast-furnace slags, fly ash, and coir fibers, which have been gaining preference among researchers in recent years [20][21][22][23][24][25]. Similarly, in terms of the investigations on MWCNTs, attention has been paid to their effects on the mechanical properties and durability of materials [10,[26][27][28]. Some studies examined the synergic effects of MWCNTs together with other additives on cement composites and concrete, such as basalt fibers, silica fume, and graphene oxide [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Study on the Pore Structure of Lightweight Mortar with Nano-Additives

Du,

Pundienė,

Pranckevičienė

et al. 2023

Nanomaterials

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With the development of nanotechnology, nanomaterials have been introduced to improve the engineering properties of cement-based building materials. An abundant number of studies have been carried out on normal-weight concrete using multi-walled carbon nanotubes (MWCNTs) or nano-silica (NS) and have proven their effectiveness. Nevertheless, still very few investigations are available in terms of lightweight cement-based materials, especially when MWCNTs and NS are binarily incorporated. Thus, in this study, fly ash cenospheres (FACs) according to cement weight were applied as lightweight fine aggregates to produce lightweight mortar (LWM). MWCNTs at 0.05, 0.15, and 0.45% and NS at 0.2 and 1.0% were binarily added as modifiers. Compressive and flexural strengths were tested to investigate mechanical behaviors. A water absorption test was conducted, together with scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP), to identify the impacts of the nano-additives on the pore structure of LWM. The following results were obtained: MWCNTs and NS demonstrated synergic effects on enhancing the mechanical properties of LWM. MWCNTs exerted positive impacts on reducing the porosity and improving the pore distribution at low dosages of 0.05 and 0.15%. The hybrid addition of NS further transformed large voids into small ones and introduced closed pores.

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Section: Introductionmentioning

confidence: 99%

Study on the Pore Structure of Lightweight Mortar with Nano-Additives

Du,

Pundienė,

Pranckevičienė

et al. 2023

Nanomaterials

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“…These increase the number of atoms on the surface of the material, resulting in insufficient coordination bonds of atoms and many unsaturated suspended bonds, and are easy to react with other atoms. Thus, nano‐Al 2 O 3 and nano‐SiO 2 have very high activity and nucleation effect 18 …”

Section: Resultsmentioning

confidence: 99%

“…Thus, nano-Al 2 O 3 and nano-SiO 2 have very high activity and nucleation effect. 18 Nano-SiO 2 and nano-Al 2 O 3 have the pozzolanic effect, and can react with Ca(OH) 2 to produce C-S-H and CaOÁAl 2 O 3 ÁH 2 O, reducing the content of Ca(OH) 2 crystal. The equation is as follows 16 :…”

Section: Mechanism Of Nanoparticles In Improving Concrete Durability ...mentioning

confidence: 99%

Nitrate corrosion resistance of concrete with nanoparticles under dry–wet cycles

Zhang

Cui

Han

et al. 2023

Structural Concrete

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The concrete of harbor wharf is in the environment of multifactor erosion. Under the coupled effects of dry–wet cycles and nitrate erosion, the durability of marine concrete gradually decreases. Therefore, it is an important issue to improve the durability of concrete. The changes of concrete durability are investigated under the coupled effects of dry–wet cycles and nitrate erosion, and the concrete durability are improved by adding nanoparticles. Nano‐concretes are made by adding different amounts of nano‐SiO2 and nano‐Al2O3 to plain concrete. The relative dynamic elastic modulus of nano‐concretes and the NO3− content are measured as indicators to evaluate the durability of nano‐concretes. The microstructure of nano‐concretes is analyzed through scanning electron microsope (SEM) and energy dispersive spectrometer (EDS）. The test results show that relative dynamic elastic modulus of nano‐concretes is increased obviously, and NO3− content of nano‐concrete at different depths is lower than that of plain concrete under the same number of dry–wet cycles. NO3− content of nano‐concrete is lower than that of plain concrete. Nanoparticles can optimize the pore structure of concrete and generate more C‐S‐H gels. Therefore, concrete durability can be efficiently increased through adding nano‐SiO2 and nano‐Al2O3 under the coupled effects of dry–wet cycles and nitrate erosion.

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“…Due to the large specific surface area and intense attraction force, nanomaterials tend to agglomerate in solutions. In current investigations [25], [26], it is suggested to combine surfactants with sonication waves. Hence, in this study, Melment F10 was initially weighed and mixed in a beaker with onethird amount of the total water, and then CNTs and NS were added and stirred until dissolution.…”

Section: Fabrication Of Samplesmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Green Lightweight Cement Composite Modified by Nano Additives

Du,

Korjakins

2023

Environmental and Climate Technologies

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Cement materials have been commonly used in the building and construction industries. However, the process of cement manufacture has long been connected with high consumption of energy and adverse environmental impacts. In this study, in order to produce innovative green cement material that consumes lower energy, resources and is more eco-friendly, industrial waste by-product fly ash cenosphere (FAC) has been utilized as lightweight aggregate to replace cement by 73.3 %. Most research regarding lightweight cement materials with FAC has mainly paid attention to the influence of FAC and the reinforcement via fibre materials, but very few studies have been devoted to the incorporation of nano additives. Therefore, 0.05 %, 0.15 %, 0.45 % of carbon nanotubes (CNTs) and 0.2 %, and 1.0 % of nano silica (NS) were used to modify lightweight cement composite (LWCC). Experiments including flexural strength test, compressive strength test, and thermogravimetric analysis were performed to evaluate the mechanical behaviours and the hydration process of the produced LWCC. Based on the experimental outcomes, incorporating CNTs and NS can effectively contribute to enhancing both flexural and compressive strength, and facilitate cement hydration reaction.

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Study on dynamic mechanical properties of carbon nanotubes reinforced concrete subjected to freeze–thaw cycles

Cited by 9 publications

References 30 publications

Study on the Pore Structure of Lightweight Mortar with Nano-Additives

Study on the Pore Structure of Lightweight Mortar with Nano-Additives

Nitrate corrosion resistance of concrete with nanoparticles under dry–wet cycles

Experimental Study on the Mechanical Properties of Green Lightweight Cement Composite Modified by Nano Additives

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