Experimental investigations on durability properties nano-silica based concrete

Chekravarty, D.S.V.S.M.R.K.; Alapati, Mallika; Sravana, P.; Rao, P. Srinivasa

doi:10.1016/j.matpr.2021.11.126

Cited by 9 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The collected and analyzed data were conducted from previous literature studies. The collected data (total datasets of 420) were divided into three groups datasets; training, testing, and validating 18–53 . The training dataset consisted of 280 data points, while the testing and validating datasets comprised 70 data points 54–56 .…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and prediction of the effect of Nanosilica on the compressive strength of concrete with different mix proportions and specimen sizes using various numerical approaches

Ali

Muayad

Mohammed

2022

Structural Concrete

View full text Add to dashboard Cite

Introducing nanotechnology in concrete is one of the most significant successes in enhancing the mechanical properties of concrete. It affects the quality of the microstructure of the concrete due to its extremely small nanoparticles leading to a faster reaction due to its large surface area. The nanoparticles fill the concrete's pores, resulting in considerably improved strengths in the early ages of the concrete. This research used six models; linear regression (LR), multilinear regression (MLR), nonlinear regression (NLR), pure quadratic (PQ), interaction (IA), and full quadratic (FQ), to predict the compressive strength of the concrete modified with different Nanosilica contents for various mix proportions. The models were applied to three datasets, with 420 collected from several research studies. The ranges of the concrete mix proportions used in this study were as follows, water/cement ratio (w/c) ranged between 0.1 and 1, cement content (C) ranged between 153.81 and 1200 kg/m3, fine aggregate content (FA) ranged between 492 and 2270 kg/m3, coarse aggregate content (CA) ranged between 617 and 2900 kg/m3, superplasticizer (SP) ranged between 0% and 6.7%, coarse aggregate size (CAS) ranged between 6 and 50.8 mm, fine aggregate size (FAS) ranged between 0.025 and 10 mm, Nanosilica content (NS%) ranged between 0% and 15%, w/c of 0.4–0.6 and the curing time (days) ranged between 3 and 180. The compressive strength of the collected datasets ranged from 3 to 120 MPa. The parameters that have improved the analyzed datasets of the compressive strength were the content of Nanosilica and the SP. The models were assessed for their accuracy using multiple assessment criteria; the most evident ones are; the objective function (OBJ), root mean square error (RMSE), Scatter Index (SI), and the maximum absolute error (MAE). The analytical models and the model comparison operations will be shown in detail in this research, indicating that the most effective and accurate model is the FQ model; where coefficient of determination (R2) of 0.96, RMSE of 3.49 MPa, MAE of 2.96 MPa, and SI of 0.08 were conducted from the analytical studies. From the developed models, the compressive strength of the concrete up to a high compressive strength level with high accurately can be predicted. Also, the compressive strength of the concrete can be accurately predicted for various sizes of aggregate and specimens.

show abstract

Section: Methodsmentioning

confidence: 99%

“…Figure 3 elaborates on the distribution of the CS ranges 73% of the data have clustered in a range of 20–55 MPa, and 23% of the data have a range of 56–120 MPa. Only 4% was recorded at the very early ages of the concrete 18–52 …”

Section: Statistical Evaluationmentioning

confidence: 99%

Analysis and prediction of the effect of Nanosilica on the compressive strength of concrete with different mix proportions and specimen sizes using various numerical approaches

Ali

Muayad

Mohammed

2022

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…[ 10 ], which is nowadays used to replace part of the cementitious materials to improve their durability and mechanical properties [ 11 , 12 , 13 ]. Chekravarty et al [ 14 ] added a 3% cement mass of NS to determine its compressive strength after immersion in 5% NaSO 4 for 90 d. The results showed that the compressive strength of NS concrete increased by 3.35% compared to normal concrete after the specimens were immersed in a salt solution for 90 days. Zhao et al [ 15 ] added NS to recycled coarse aggregate concrete to determine its compressive strength, flexural strength, and other properties, and the results showed that the 2% of NS had the best modification effect on recycled aggregate concrete, and its compressive strength and flexural strength were increased by 31.8% and 33.2% compared with those before modification.…”

Section: Introductionmentioning

confidence: 99%

Durability and Mechanical Properties of Nano-SiO2 and Polyvinyl Alcohol Fiber-Reinforced Cementitious Composites Subjected to Saline Freeze–Thaw Cycles

Wan,

Zhao,

et al. 2024

Materials

View full text Add to dashboard Cite

To investigate the effects of nano-SiO2 (NS) and polyvinyl alcohol (PVA) fibers on the durability and mechanical properties of cementitious composites subjected to saline freeze–thaw cycling, a series of PVA fiber-reinforced cementitious composite (PFRCC) specimens were prepared using various fiber contents, and a series of NS and PVA fiber-reinforced cementitious composite (NPFRCC) specimens were prepared using various combinations of NS and fiber contents. Durability and fracture toughness tests were subsequently conducted on the specimens after different numbers of saline freeze–thaw cycles. The results indicate that the degradation of material properties can be divided into slow and accelerated damage stages before/after 50 freeze–thaw cycles. The durability and fracture toughness of the specimen series tended to increase, then decrease with increasing NS and PVA contents, suggesting optimum levels. When the PVA fiber content was 0.5%, PFRCC specimens had the best durability after saline freeze–thaw cycles; when the NS and PVA fiber contents were 1.0% and 0.5%, respectively, NPFRCC specimens had the best durability and fracture properties, and the initiation toughness, destabilization toughness, and fracture energy after 100 saline freeze–thaw cycles were 120.69%, 160.02%, and 451.31%, respectively. The results of this study may guide future exploration of the durability and mechanical properties of concrete subjected to freeze–thaw action.

show abstract

“…A literature review indicates various options for improving the performance and changing the concrete parameters with the use of nanotechnology [10][11][12][13][14][15]. The most widely used and fully tested nanomaterials added into cement-based composites include nanosilica [16,17], nano-alumina [18], and nano-clay [19], which promote and accelerate the pozzolanic chemical reaction, imparting increased mechanical strength to the concrete.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Combined Polymorphs Anatase-Rutile Nano-Modified Lightweight Concrete on Photocatalytic Reduction of NOx, Self-Cleaning Performance, and Antimicrobial Properties

Kujawa

Didyk-Mucha²,

Olewnik-Kruszkowska

et al. 2023

Buildings

View full text Add to dashboard Cite

Anatase, one of the polymorphs of titanium dioxide (TiO2), has become the most widely used semiconductor for photocatalytic materials due to its chemical and physical properties. However, researchers have been studying the use of alternative materials (e.g., ZnO, N-doped, and C-doped TiO2) to improve the photocatalytic activity of cementitious materials. In this paper, we propose a modification of lightweight concrete by introducing mixed phases of titanium dioxide—anatase and rutile—to enhance its photocatalytic performance. The efficiency of NOx degradation of nano TiO2-modified concrete, its self-cleaning performance, and its antimicrobial properties were studied. The photocatalytic activity of lightweight concrete without TiO2 and concrete with the addition of anatase, rutile, and anatase-rutile was compared. The results show that modifying the samples by adding a mixture of anatase and rutile (2.5 wt % A + 2.5 wt % R) significantly improved the photocatalytic performance of lightweight concrete.

show abstract

Experimental investigations on durability properties nano-silica based concrete

Cited by 9 publications

References 0 publications

Analysis and prediction of the effect of Nanosilica on the compressive strength of concrete with different mix proportions and specimen sizes using various numerical approaches

Analysis and prediction of the effect of Nanosilica on the compressive strength of concrete with different mix proportions and specimen sizes using various numerical approaches

Durability and Mechanical Properties of Nano-SiO2 and Polyvinyl Alcohol Fiber-Reinforced Cementitious Composites Subjected to Saline Freeze–Thaw Cycles

Synergistic Effect of Combined Polymorphs Anatase-Rutile Nano-Modified Lightweight Concrete on Photocatalytic Reduction of NOx, Self-Cleaning Performance, and Antimicrobial Properties

Contact Info

Product

Resources

About