Research on the influence of carbon nanotubes (CNTs) on compressive strength and air-void structure of ultra-light foamed concrete

Zhang, Jing; Liu, Xiangdong

doi:10.1080/15376494.2018.1475583

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…𝑦 1 = 10.319 − 0.013𝑥 1 + 0.027𝑥 2 + 0.001𝑥 3 + 0.002𝑥 4 R² =0.848 𝑒𝑞. 46 Jing Zhang and Xiangdong Liu [41] investigated the effect of carbon nanotubes (CNTs) on the compressive strength of ultra-lightweight foamed concrete. He established a binary linear regression model and a ternary linear regression model for predicting the strength of six groups of ultra-lightweight foamed concrete with a density of 200-250 kg/m³ .The first bivariate linear regression model takes porosity and CNTs content as independent variables, the second bivariate linear regression model takes porosity and pore size as independent variables.…”

Section: Multiple Linear Regression (Mlr)modelmentioning

confidence: 99%

Review of researches on strength model of foamed concrete

2024

J. Phys.: Conf. Ser.

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Compared with ordinary concrete, foamed concrete has the advantages of light weight, high fluidity, good thermal and sound insulation properties. It has been initially applied in the construction industry. As the most basic research content of foamed concrete, the strength prediction model has received widespread attention from scholars. In this paper, the existing foamed concrete strength prediction models were summarized. The development status of the traditional empirical model based on theory or experiment and the artificial intelligence model based on computer technology were analyzed, and the advantages and disadvantages of each model were described comprehensively. The following conclusions can be drawn: ①Porosity is an important factor affecting the density and compressive strength of foamed concrete. Considering pore structure and volume composition will be more convenient and accurate to predict the strength. ② As for gel-space ratio model, considering the contribution of different hydration products produced by the cementitious materials to the strength is helpful to improve the accuracy of the prediction model. ③ The artificial intelligence model overcomes the shortcomings of less factors in the empirical model and large amount of experiments with high cost, which makes the strength prediction more effective and precise. This paper provides a train of thought for further research on the strength prediction model of foamed concrete. The development of foamed concrete strength prediction model can provide theoretical guidance for the design of foamed concrete, and is of great significance for promoting the application of foamed concrete in various occasions.

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Section: Multiple Linear Regression (Mlr)modelmentioning

confidence: 99%

Review of researches on strength model of foamed concrete

2024

J. Phys.: Conf. Ser.

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“…Studies on the effects of carbon nanotubes (CNTs) on the properties of ULFCs have shown that the use of CNTs contributes significantly to early strength development and 28 d strength. It was also reported that CNTs can affect the improvement in the uniformity of air void structures [31]. Luo et al [32] reported a 27% improvement in the compressive strength of ULFC, with a density of 300 kg/m 3 , through the addition of a low dosage of CNTs, together with a reduction in the average pore diameter.…”

Section: Introductionmentioning

confidence: 99%

The performance of ultra-lightweight foamed concrete incorporating nanosilica

Elrahman

Sikora

Chung

et al. 2021

Archiv.Civ.Mech.Eng

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This paper aims to investigate the feasibility of the incorporation of nanosilica (NS) in ultra-lightweight foamed concrete (ULFC), with an oven-dry density of 350 kg/m3, in regard to its fresh and hardened characteristics. The performance of various dosages of NS, up to 10 wt.-%, were examined. In addition, fly ash and silica fume were used as cement replacing materials, to compare their influence on the properties of foamed concrete. Mechanical and physical properties, drying shrinkage and the sorption of concrete were measured. Scanning electron microscopy (SEM) and X-ray microcomputed tomography (µ-CT) and a probabilistic approach were implemented to evaluate the microstructural changes associated with the incorporation of different additives, such as wall thickness and pore anisotropy of produced ULFCs. The experimental results confirmed that the use of NS in optimal dosage is an effective way to improve the stability of foam bubbles in the fresh state. Incorporation of NS decrease the pore anisotropy and allows to produce a foamed concrete with increased wall thickness. As a result more robust and homogenous microstructure is produced which translate to improved mechanical and transport related properties. It was found that replacement of cement with 5 wt.-% and 10 wt.-% NS increase the compressive strength of ULFC by 20% and 25%, respectively, when compared to control concrete. The drying shrinkage of the NS-incorporated mixes was higher than in the control mix at early ages, while decreasing at 28 d. In overall, it was found that NS is more effective than other conventional fine materials in improving the stability of fresh mixture as well as enhancing the strength of foamed concrete and reducing its porosity and sorption.

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“…However, few studies have found the effects of MWCNTs and AEA on the foamed cement paste's rheological properties and the influence on the stability of foam and entrained air. In a study [44], it was concluded that using MWCNTs in foam concrete can significantly increase the foam's stability and the concrete's compressive strength. This effect occurs because the foam concrete paste retains its strength longer, C 3 S hydration takes place more actively in the paste, and MWCNTs adhere very closely to the newly formatted C-S-H and ensure their growth.…”

Section: Introductionmentioning

confidence: 99%

The Role of MWCNTs in Enhancing the Foam Stability and Rheological Behavior of Cement Pastes That Contain Air-Entraining and Superplasticizer Admixtures

Pundienė,

Pranckevičienė

2023

Nanomaterials

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This research delves into the intricate dynamics between multi-walled carbon nanotubes (MWCNTs), air-entraining admixtures (AEAs), and a range of superplasticizers (SPs) in cementitious systems, shedding light on key aspects of construction material innovation. The focus is on how MWCNTs, AEAs, and specific SPs—namely, lignosulfonate (LS), polycarboxylate (PCE), and polyacrylate (PA)—influence the stability of foams and the viscosity and setting times of cement pastes. To assess the impacts of these components, we employed foam stability assessments, viscosity measurement techniques, electrical conductivity analysis, and evaluations of dispersion and setting times. Results indicate that MWCNTs enhance foam stability and viscosity, with the degree of improvement contingent on the type and concentration of SPs and the presence of AEAs. Notably, SPs, particularly PCE and PA, markedly influence the properties of cement paste, including increasing dispersion values and modulating setting times, especially when combined with MWCNTs and AEAs. The study concludes that strategically combining MWCNTs with specific SPs and AEAs alters the physical properties of cementitious materials significantly, underscoring the potential for customizing material design in the construction sector.

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Research on the influence of carbon nanotubes (CNTs) on compressive strength and air-void structure of ultra-light foamed concrete

Cited by 12 publications

References 18 publications

Review of researches on strength model of foamed concrete

Review of researches on strength model of foamed concrete

The performance of ultra-lightweight foamed concrete incorporating nanosilica

The Role of MWCNTs in Enhancing the Foam Stability and Rheological Behavior of Cement Pastes That Contain Air-Entraining and Superplasticizer Admixtures

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