Effects of nano-silica on the gas permeability, durability and mechanical properties of high-strength lightweight concrete

Atmaca, Nihat; Abbas, Mohammed Layth; Atmaca, Adem

doi:10.1016/j.conbuildmat.2017.04.156

Cited by 87 publications

(55 citation statements)

References 32 publications

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“…For comparison, the amount of nanosilica added to concrete as a permeability reducer, as reported in literature, varied between 1% and 15% by mass of cement. [14][15][16] The picture emerging from these results is the occurrence of a topological change in the 3D pore network in the presence of the nanocomposite admixture. This has to be ascribed to the precipitation of hydration product in the pore space, rather than at the surface of cement particles, which obstructs some pathways for water migration (Figure 10).…”

Section: Discussionmentioning

confidence: 92%

“…Therefore, significant refinement of the pore network can be obtained by the addition of an amount of Me–S–H admixture as low as 3% by mass of cement (corresponding to an amount of solid nanoparticles of 0.6%). For comparison, the amount of nanosilica added to concrete as a permeability reducer, as reported in literature, varied between 1% and 15% by mass of cement …”

Section: Discussionmentioning

confidence: 99%

“…12,13 It has also been shown that the addition of nano-SiO 2 and nano-TiO 2 may enhance concrete permeability. [14][15][16] In this study, we investigate the potential of a novel PCE/C-S-H nanocomposite admixture to act as a water permeability reducing agent. The use of admixtures based on nanosized agents has found wide application in the engineering of the properties of cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Use of nanocomposites as permeability reducing admixtures

Valentini

Ferrari²,

Russo³

et al. 2018

J Am Ceram Soc

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Permeability is one of the fundamental properties of concrete structures as it is strictly related to durability. Mitigation of the degradation processes induced by aggressive solutions can be achieved by controlling water penetration through the pore network. In this study, we test the potential use of nanocomposites as waterproofing agents in concrete. Macroscopic measurements show that the addition of a small amount of nanoparticles effectively reduces the extent of the water permeation front. A combination of experiments, based on X‐ray tomography, mercury intrusion porosimetry, and BET nitrogen adsorption, and of numerical simulations, are used to interpret the macroscopic observations. These investigations show that C–S–H precipitation away from cement surfaces, induced by the presence of nanoparticles, leads to a refinement of the pore network. Such a microstructural change in the cement matrix results in a net reduction in the overall concrete permeability.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of nanocomposites as permeability reducing admixtures

Valentini

Ferrari²,

Russo³

et al. 2018

J Am Ceram Soc

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“…There are three performance classes for cement composites: normal performance, high-performance and ultra-high performance, with respective compressive strengths of less than 100 MPa, 100–150 MPa and more than 150 MPa. All three classes have a minimum durability of 200 years [ 7 , 8 , 9 ]. The present research results indicate that the strength and durability of cement composites mainly depend on their microstructure.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of GO/Cement Composites by Incorporation of Few-Layered GO Nanosheets and Characterization of Their Crystal/Chemical Structure and Properties

Zhang

et al. 2017

Nanomaterials

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Original graphene oxide (GO) nanosheets were prepared using the Hummers method and found to easily aggregate in aqueous and cement composites. Using carboxymethyl chitosan (CCS) as a dispersant, few-layered GO nanosheets (1–2 layers) were obtained by forming CCS/GO intercalation composites. The testing results indicated that the few-layered GO nanosheets could uniformly spread, both in aqueous and cement composites. The cement composites were prepared with GO dosages of 0.03%, 0.05% and 0.07% and we found that they had a compact microstructure in the whole volume. A special feature was determined, namely that the microstructures consisted of regular-shaped crystals created by self-crosslinking. The X-ray diffraction (XRD) results indicated that there was a higher number of cement hydration crystals in GO/cement composites. Meanwhile, we also found that partially-amorphous Calcium-Silicate-Hydrate (C-S-H) gel turned into monoclinic crystals. At 28 days, the GO/cement composites reached the maximum compressive and flexural strengths at a 0.05% dosage. These strengths were 176.64 and 31.67 MPa and, compared with control samples, their increased ratios were 64.87% and 149.73%, respectively. Durability parameters, such as penetration, freeze-thaw, carbonation, drying-shrinkage value and pore structure, showed marked improvement. The results indicated that it is possible to obtain cement composites with a compact microstructure and with high performances by introducing CCS/GO intercalation composites.

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“…SCC. Scientists carried out many experimental studies for determination of these hardened properties [8,9,10,11,12].…”

mentioning

confidence: 99%

The Investigation of Strength and Water Absorption of Self-Compacting Concrete by Inclusion of Metakaolin and Calcined Kaolin

Atmaca

Sezer

2018

Hittite J. Sci. Eng.

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S elf-Compacting Concrete (SCC) is a special type of high-performance concrete with high fluidity and workability properties due to its lower water to cement ratio which leads to rapid strength development and high durability performances. This special concrete fills the framework without any vibration process and it can be easily placed in the dense reinforcement [1, 2]. Additionally, SCC shows better performances in terms of segregation and bleeding. Nowadays it becomes one of the most popular construction materials [3, 4]. The researchers are focused on fresh and hardened properties of the SCC [5, 6]. Filling ability, passing ability, and segregation resistance are the main fresh properties of SCC. Slump flow test, V-funnel test, J-ring test and Orimet test are used for determination of filling abilities of SCC. For determination of the passing ability of SCC L-box test and J-ring tests are used and for determination of segregation resistance of SCC sieve stability test and penetration test are used [7]. Compressive strength, tensile strength, sorptivity, modulus of elasticity, creep, shrinkage, freeze-thaw resistance, permeability and water absorption are the main hardened properties of

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Effects of nano-silica on the gas permeability, durability and mechanical properties of high-strength lightweight concrete

Cited by 87 publications

References 32 publications

Use of nanocomposites as permeability reducing admixtures

Use of nanocomposites as permeability reducing admixtures

Fabrication of GO/Cement Composites by Incorporation of Few-Layered GO Nanosheets and Characterization of Their Crystal/Chemical Structure and Properties

The Investigation of Strength and Water Absorption of Self-Compacting Concrete by Inclusion of Metakaolin and Calcined Kaolin

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