Influence of nanoparticles on fluidity and mechanical properties of cement mortar

Liu, Jintao; Li, Qinghua; Xu, Sheng

doi:10.1016/j.conbuildmat.2015.10.149

Cited by 139 publications

(61 citation statements)

References 32 publications

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“…Among them, nano-SiO 2 (NS) has received the most attention, and has been reported on intensively due to its pozzolanic reaction with portlandite, besides the filling effect. Recent experimental results have indicated that the application of nano-SiO 2 in cementitious systems can accelerate the cement hydration rate, refine pore structure, improve strength, and increase durability [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, during cement hydration, well distributed nano-SiO 2 could also act as crystallization centers of hydrated products, thus increasing the hydration rate. Furthermore, as nano-SiO 2 exhibits high pozzolanic reactivity [ 19 , 20 ], focus has been centered on the microstructure modification effect of nano-SiO 2 cement-based materials [ 21 , 22 , 23 ]. It can react with calcium hydroxide to produce additional homogeneous calcium silicate hydrates (C-S-H) gel, resulting in a denser and more compact microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Sun

et al. 2017

Nanomaterials

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The impact of nano-SiO2 on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (w/s) of one. Nano-SiO2 was used in partial substitution of AC$A cement at zero, one and three wt %. Calorimetry, X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetric (TG/DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses were used to characterize the hydration and hydrates of the blended cement. The hydration of the AC$A cement was significantly promoted, resulting in an increase of the heat released with the addition of nano-SiO2. Phase development composition analysis showed that nano-SiO2 had no effect on the type of crystalline hydration products of the AC$A cement. Moreover, nano-SiO2 showed significant positive effects on pore refinement where the total porosity decreased by 54.09% at three days with the inclusion of 3% nano-SiO2. Finally, from the SEM observations, nano-SiO2 was conducive to producing a denser microstructure than that of the control sample.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Sun

et al. 2017

Nanomaterials

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“…The concept of cement pastes followed the API [38]. Blending practices were performed in a constant speed mixer according to the procedures described in previous research [37], as follows; First, cement and NP were put into the mixing pot and agitated for 2 min. Afterward, the dispersant was dissolved in the mixing water.…”

Section: Slurry Preparationmentioning

confidence: 99%

“…The results revealed that the NS particles with a higher specific surface area (220 ± 5 m 2 /g) made the slurry slightly thicker than NT particles with a specific surface area of the 160-180 m 2 /g. Liu et al [37] identified that the incorporation of NS and NT in cemented materials decreases the workability since NS and NT particles absorb part of the blending water. Thus, water molecules are freely drawn towards the NS and NT powders due to enormous surface area and greater reactivity.…”

Section: Influence Of Ns and Nt Particles On Rheological Propertiesmentioning

confidence: 99%

Application of nanoparticles for strengthening wellbore cement-formation bonding

Maagi

2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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This study evaluates the wellbore shear bond strength of oil-well cement pastes containing nano-SiO2 and nano-TiO2 particles with an average of 20 ± 5 nm particle sizes. The nanoparticles were selected by weight of cement at proportions equivalent to 1, 2, 3 and 4%. The findings demonstrated that nanoparticles significantly increased the shear bond strength, and the strength increase was dependent on the nanoparticle types, dosage and curing period of the specimens. Due to effective pozzolanic activity, nano-SiO2 provided higher shear bond strength compared to nano-TiO2. The specimens containing 3% nano-SiO2 cured for 28 days displayed the utmost shear bond strength results (0.553 MPa). The optimal replacement dosage was 3% for all nanoparticles. The particle type did not affect the optimum nanoparticles replacement content. To examine the influence of nanoparticles on cement-formation bonding, a Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and thermogravimetric technique were used.

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“…On the one hand, the increase in the strength of the gypsum board was due to the filling action of the nanomaterial. On the other hand, the surface of the nanomaterial had more active bonds, which could be used as a ready-made nucleus, allowing the hydration product to grow on the nanomaterial to form a dense structure [36,37].…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Preparation and Property Modification on Novel Energy Storage Material: n‐Octadecane PCMs/Expanded Perlite Composite Gypsum Board

Zhu

Guo

Hou

et al. 2019

Advances in Civil Engineering

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Phase change materials (PCMs) have been widely used to improve the thermal energy storage capacity of building materials. In this study, the n-octadecane (OD)/expanded perlite (EP) composite PCM, which was prepared by incorporation of liquid noctadecane into EP using the vacuum impregnation method, was used to fabricate the gypsum board. e microscopic, thermal, and mechanical properties were studied. e SEM results showed that OD could be absorbed into the pores of EP uniformly. e FI-IR results showed that OD and EP have good chemical stability. It was found that the gypsum board has best heat transfer delay when the volume fraction of OD/EP was 20% (v/v). e mechanical property of the gypsum board with OD/EP decreased. To deal with the problem, the effect of nano-Al 2 O 3 on the gypsum board was also studied. e results showed that the mechanical properties of the gypsum board were effectively increased when the dosage of nano-Al 2 O 3 was 0.5 wt.%, and the gypsum board had the best thermal insulation effect when the nano-Al 2 O 3 content was 0.3 wt.%. Considering the cost and the comprehensive property, it was suggested that the optimal addition content of nano-Al 2 O 3 was 0.3 wt.%.

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Influence of nanoparticles on fluidity and mechanical properties of cement mortar

Cited by 139 publications

References 32 publications

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Application of nanoparticles for strengthening wellbore cement-formation bonding

Preparation and Property Modification on Novel Energy Storage Material: n‐Octadecane PCMs/Expanded Perlite Composite Gypsum Board

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