Comprehensive performances of carbon nanotube reinforced foam concrete with tetraethyl orthosilicate impregnation

Luo, Jianlin; Hou, Dongshuai; Li, Qiuyi; Wu, Chao; Zhang, Chunwei

doi:10.1016/j.conbuildmat.2016.11.105

Cited by 32 publications

(11 citation statements)

References 23 publications

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“…Their results demonstrated a strength improvement compared with the control batches. Luo et al [30] investigated the effect of using CNT-to-cement weight fractions of 0.05 to 0.1% on several properties of foam concrete. They showed the ability of CNTs to decrease the average pore diameter and to increase the compressive strength by about 30% in comparison with the control batch.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Mohsen

Ansari

Taha³

et al. 2019

Journal of Nanomaterials

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Recently, remarkable types of carbon nanofilaments called carbon nanotubes (CNTs) have raised the interest of many concrete and cementitious composite researchers due to their significant mechanical, electrical, thermal, kinetic, and chemical properties. These nanofilaments are considered promising applicants to use in producing high-performance cement-based composite materials. In this research, the effect of CNT use on the flexural strength, strain capacity, permeability, and microstructure of concrete was investigated. Concrete batches of 0, 0.03, 0.08, 0.15, and 0.25 wt.% CNTs were prepared using a mixing method that consisted of a 30-minute solution sonication and a 60-minute batch mixing. On the 28th day, the mechanical properties were determined. The results indicated that concrete prepared using high CNT contents of 0.15 and 0.25 wt.% increased the flexural strength by more than 100% in comparison with 0% CNT concrete. Furthermore, the results showed that CNTs would increase the ductility of concrete beams by about 150%. The permeability test results showed the benefits of CNT inclusion in reducing the permeability of concrete. The permeability coefficient (kT) decreased by at least 45% when CNTs were added to concrete. A qualitative microstructural analysis illustrated the uniform dispersion of CNT filaments within the concrete hydration products in all batches.

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Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Mohsen

Ansari

Taha³

et al. 2019

Journal of Nanomaterials

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“…In recent years, the use of nanomaterials to enhance the mechanical properties of cementitious composites has been considered as a promising approach. [34][35][36] Several nanomaterials, including Silica, 37 titania, 38 alumina, 39 iron oxide, 40 nanoclay, 41 nano-kaolinite, 42 carbon nanotubes [43][44][45] or nanofibers, 46,47 and graphene oxide, 48 were used as modifiers to enhance the performances of cement-based materials. Although previous studies have demonstrated that the addition of nanomaterials has positive effects on the mechanical properties enhancement of cementitious composites, however, the weight fractions of the nano modifiers were ranged from 3 to 10 wt%, which largely limited their applications in civil infrastructures because of the relatively high cost of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Low dosage nano-silica modification on lightweight aggregate concrete

Zhang

Xie

Cheng

et al. 2018

Nanomaterials and Nanotechnology

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Although the nano modification has been considered as a promising approach to enhance the mechanical properties of cement-based concrete, the investigation of low dosage nano modification on lightweight cement-based concrete is still very limited. In this study, the lightweight concrete, which was modified with low dosage nano-silica particles, were investigated. Non-prewetting and prewetting methods were used to prepare the lightweight concrete samples. The compressive and flexural strengths were tested to evaluate the modification effects of low dosage nano-silica on lightweight concrete. The microstructure analyses demonstrate that the hydration process of the cement paste can be changed with addition of nanosilica, and new types of hydration products have been observed in nano modified cementitious matrix. The interface between the lightweight aggregates and the cement paste can be reinforced by low dosage of nano-silica due to the new types of hydration products. However, relatively high dosage of nano-silica will reduce the modification effect because of the internal stress, which is resulted from the volume expansion of the new types of hydration product, at the interface of the lightweight aggregates and the cement paste. This study not only shows the possibility of low dosage nano modification on the mechanical properties enhancement of lightweight concrete but also provides potential modification mechanisms, which help to design and fabricate high-performance lightweight concrete materials.

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“…FC is generally produced with cement, filler, water, and a liquid chemical under controlled conditions, and the liquid chemical can be diluted by water and aerated to foaming [14,15,16,17,18,19,20,21,22]. Although the dry density ( ρ d ) and thermal conductivity coefficient ( k c ) of FC is lower than that of ordinary concrete, its insufficiency of high porosity, multiple connected pores, and low strength limits its widespread development.…”

Section: Introductionmentioning

confidence: 99%

“…The use of an orthogonal design can significantly reduce the cost and time of the experiment [44,45]. The mixture ratio of HBFC with stable and excellent properties can be selected more accurately by using an analysis of means (ANOM) and variances (ANOVA) [14,28,29].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Physical Properties of High-Belite Sulphoaluminate Cement-Based Foam Concrete Using an Orthogonal Test

Liu

Luo

et al. 2019

Materials

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Prefabricated building development increasingly requires foam concrete (FC) insulation panels with low dry density (ρd), low thermal conductivity coefficient (kc), and a certain compressive strength (fcu). Here, the foam properties of a composite foaming agent with different dilution ratios were studied first, high-belite sulphoaluminate cement (HBSC)-based FCs (HBFCs) with 16 groups of orthogonal mix proportions were subsequently fabricated by a pre-foaming method, and physical properties (ρd, fcu, and kc) of the cured HBFC were characterized in tandem with microstructures. The optimum mix ratios for ρd, fcu, and kc properties were obtained by the range analysis and variance analysis, and the final optimization verification and economic cost of HBFC was also carried out. Orthogonal results show that foam produced by the foaming agent at a dilution ratio of 1:30 can meet the requirements of foam properties for HBFC, with the 1 h bleeding volume, 1 h settling distance, foamability, and foam density being 65.1 ± 3.5 mL, 8.0 ± 0.4 mm, 27.9 ± 0.9 times, and 45.0 ± 1.4 kg/m3, respectively. The increase of fly ash (FA) and foam dosage can effectively reduce the kc of the cured HBFC, but also leads to the decrease of fcu due to the increase in mean pore size and the connected pore amount, and the decline of pore uniformity and pore wall strength. When the dosage of FA, water, foam, and the naphthalene-based superplasticizer of the binder is 20 wt%, 0.50, 16.5 wt%, and 0.6 wt%, the cured HBFC with ρd of 293.5 ± 4.9 kg/m3, fcu of 0.58 ± 0.02 MPa and kc of 0.09234 ± 0.00142 W/m·k is achieved. In addition, the cost of HBFC is only 39.5 $/m3, which is 5.2 $ lower than that of ordinary Portland cement (OPC)-based FC. If the surface of the optimized HBFC is further treated with water repellent, it will completely meet the requirements for a prefabricated ultra-light insulation panel.

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Comprehensive performances of carbon nanotube reinforced foam concrete with tetraethyl orthosilicate impregnation

Cited by 32 publications

References 23 publications

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Low dosage nano-silica modification on lightweight aggregate concrete

Preparation and Physical Properties of High-Belite Sulphoaluminate Cement-Based Foam Concrete Using an Orthogonal Test

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