Environmental resistance of cement concrete modified with low dosage nano particles

Xu, Shujuan; Xie, Ning; Cheng, Xin; Huang, Shifeng; Li, Feng; Zhu, Yunzhe

doi:10.1016/j.conbuildmat.2017.12.188

Cited by 31 publications

(9 citation statements)

References 44 publications

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“…In current years, multidisciplinary study emphasis has shifted to nanomaterials in construction applications [ 7 ]. The sol–gel technique to NS-solution may minimize the agglomeration of nanoparticles usually found in dry mixes, and the geopolymers (GP)s produced using this method demonstrated decreased micro-porosity and improved fire resistance performance [ 7 , 8 , 9 ]. The nanomaterials are extremely strong and have excellent physical and chemical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

et al. 2022

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The main objective of this review is to study some important nanomaterials and their impact on the performance of geopolymer concrete. This paper is an investigation into trends and technology in the development of different nanomaterials to develop higher structural performance geopolymer concrete. The effect of the alkaline to binder and sodium silicate to sodium hydroxide ratio on the performances of geopolymer performances is studied. The relationship between setting time and slump is evaluated through the ternary plot, the variation in compressive strength values is evaluated using the kernel density plot, and the relationship between split tensile and flexural strength is investigated using the scattering interval plot. Regression analysis is carried out among water absorption and bulk-density result values obtained from previous literature. As the molarity and alkaline to binder (A/B) ratios increase, the strength development of geopolymer concrete increases up to a specific limit. The addition of a small quantity of nanomaterials, namely, nano silica, nano alumina, carbon nano tubes, and nano clay, led to the maximum strength development of geopolymer concrete. Incorporating these nanomaterials into the geopolymer significantly refines the structural stability, improving its durability. The various products in GP composites emerging from the incorporation of highly reactive SEM, XRD, and FTIR analysis of nanomaterials reveal that the presence of nanomaterials, which enhances the rate of polymerization, leads to better performance of the geopolymer.

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Section: Introductionmentioning

confidence: 99%

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

et al. 2022

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“…Nano silica (SiO 2 ) also accelerates the hydration of C 3 S owing to extremely reactive surface of the nanoparticles [8]. Mechanical properties, Environmental resistance and durability of ordinary, geopolymer concrete and high performance concrete can be improved using NS [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The influence of silica fume, nano silica and mixing method on the strength and durability of concrete

et al. 2019

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The present work was accomplished to investigate silica fume (SF) and nano silica (NS) effects on the compressive strength (f cu28) of concrete made by cement contents (CC) of 300, 400, 500 and 600 kg/m 3. Two NS types having purity of 89% (Type I) and 99% (Type II) were partially replaced CC by the percentages of 1.5% and 3%. The influence of replacing cement by 5% and 10% SF was also studied. Nano silica was mixed by two techniques, mechanically and by ultrasonic device. The influence of SF, NS and CC on f cu28 and water absorption (WA) was found. The obtained results indicated that f cu28 increased and WA% reduced by replacing part of CC by either NS or SF. For both of NS types, the enhancement ratio in f cu28 was higher when replacing cement by 1.5% NS compared to replacement ratio of 3% and both ratios recorded greater values of compressive strength when compared to that without NS. At 1.5% NS ratio, f cu28 increased by about 14.81% for type I and by 41.33 for type II while at 3% NS, the enhancement ratios were 5.86% for type I and 35.46 for type II respectively. Mixing Type I NS by ultrasonic mixing method recorded higher values for f cu28 as compared to those recorded by the mechanical method.

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“…This result occurs because of the more homogenous distribution caused by NPs, increasing particle density and lowering the grain size inside the material matrix. Although these effects have been postulated, these improvements are often only seen at low energies (<0.03 MeV), while at higher energies, the effect of particle size on the radiation shielding ability of the samples is minimal [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of Introducing Micro- and Nanoparticle Bismuth Oxide (Bi2O3) on the Gamma Ray Shielding Performance of Novel Concrete

et al. 2021

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The aim of this study is to investigate the radiation shielding properties of novel concrete samples with bulk Bi2O3 and Bi2O3 nanoparticles (Bi2O3 NP) incorporated into its composition. The mass attenuation coefficient of the concrete samples without Bi2O3 and with 5 and 7 wt% bulk Bi2O3 were experimentally determined and were compared against values obtained using the XCOM and Geant4 simulations. Both methods greatly agree with the experimental values. The linear attenuation coefficients (LAC) of blank concrete (C-0), concrete with 5% bulk Bi2O3 (C-B5), and concrete with 5% nanoparticle Bi2O3 (C-N5) were determined and compared at a wide energy range. We found that the LAC follows the trend of C-0 < C-B5 < C-N5 at all the tested energies. Since both C-B5 and C-N5 have a greater LAC than C-0, these results indicate that the addition of Bi2O3 improves the shielding ability of the concretes. In addition, we investigated the influence of nanoparticle Bi2O3 on the LAC of the concretes. The half-value layer (HVL) for the concretes with bulk Bi2O3 and Bi2O3 nanoparticles is also investigated. At all energies, the C-0 has the greatest HVL, while C-N15 has the least. Thus, C-N15 concrete is the most space efficient, while C-0 is the least space efficient. The radiation protection efficiency (RPE) of the prepared concretes was found to decrease with increasing energy for all five samples. For C-0, the RPE decreased from 63.3% at 0.060 MeV to 13.48% at 1.408 MeV, while for C-N15, the RPE decreased from 87.9 to 15.09% for the same respective energies. Additionally, C-N5 had a greater RPE than C-B5, this result demonstrates that Bi2O3 NP are more efficient at shielding radiation than bulk Bi2O3.

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Environmental resistance of cement concrete modified with low dosage nano particles

Cited by 31 publications

References 44 publications

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

The influence of silica fume, nano silica and mixing method on the strength and durability of concrete

Understanding the Effect of Introducing Micro- and Nanoparticle Bismuth Oxide (Bi2O3) on the Gamma Ray Shielding Performance of Novel Concrete

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