Multiple effects of nano-CaCO3 and modified polyvinyl alcohol fiber on flexure–tension-resistant performance of engineered cementitious composites

Sun, Mian; Zhu, Jiaoqun; Sun, Tao; Chen, Youzhi; Li, Xinping; Yin, Weisong; Han, Jinlong

doi:10.1016/j.conbuildmat.2021.124426

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…Accordingly, the increase in the nanocalcite content in the mixes increased the flexural strength values. Sun et al [51] found that the content of nano-CaCO 3 improved the flexural performance of ECC. In addition, increasing the nanocalcite content in the blends increased the flexural strength values to 13.1, 14.31, 16.9, and 15.31 MPa for 0, 0.5, 1, and 1.5 NCa series, respectively.…”

Section: Flexural Performancementioning

confidence: 99%

Investigation of the Mechanical, Microstructure and 3D Fractal Analysis of Nanocalcite-Modified Environmentally Friendly and Sustainable Cementitious Composites

et al. 2022

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Unlike conventional concrete materials, Engineered Cementitious Composites (ECC) use a micromechanics-based design theory in the material design process. Recently, the use of nanoparticles in various concretes and mortars has increased. This study used nanocalcite to investigate the mechanical, microstructural fractal analysis of environmentally friendly nanocalcite-doped ECC (NCa-ECC). This paper investigated the effects of nanocalcite (NCa) with different contents (0.5, 1, and 1.5% by mass of binder) on the mechanical properties of engineered cementitious composites (ECC). For this purpose, compressive strength, ultrasonic pulse velocity (UPV), and flexural strength tests were conducted to investigate the mechanical properties of the ECC series. In addition, SEM analyses were carried out to investigate the microstructural properties of the ECC series. The content of nanocalcite improved the mechanical and microstructural properties of the nanocalcite-modified ECC series. In addition, the 1 NCa series (1% nanocalcite modified to the mass of the binder) had the best performance among the series used in this study.

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Section: Flexural Performancementioning

confidence: 99%

Investigation of the Mechanical, Microstructure and 3D Fractal Analysis of Nanocalcite-Modified Environmentally Friendly and Sustainable Cementitious Composites

et al. 2022

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“…Ling et al [ 6 ] found that incorporation of PVAF can greatly enhance the flexural strength (in a range of 5.21–11.17 MPa), tensile strength (1.72–3.44 MPa), and fracture energy of CBC; however, its effect on compressive strength is found to be marginal (varying in a range of 61.8–67.3 MPa) and the PVAF dosage affects the tension zone more than the compression zone. Sun et al [ 7 ] reported that the compressive strength of CBC is reduced with PVAF content, while Niu et al [ 8 ] found that PVAF showed an adverse effect on the compressive strength of sulfoaluminate cement (SAC) with a reinforcing effect on its flexural strength and bending strength. During their testing, a softening performance after undergoing a peak loading was recorded in the SAC owing to the incorporation of PVAF.…”

Section: Introductionmentioning

confidence: 99%

An Investigation into PVA Fiber Modified with SiO2 for Improving Mechanical Properties of Oil-Well Cements

Wu,

Chen,

Liu

et al. 2024

Materials

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In this paper, we conduct a comprehensive investigation into PVA fiber modified with SiO2 to improve the mechanical properties of oil-well cements. Specifically, SiO2 was coated onto the surface of polyvinyl alcohol fiber (PVAF) as its silicon source via a sol-gel process by using tetraethyl orthosilicate (TEOS), while hydrochloric acid and ammonia were respectively used as the catalyst in the sol (hydrolysis) and the gel (condensation) processes. The PVAF microstructure was then characterized with the scanning electron microscope (SEM), while the effects of the modified PVAF on both mechanical and rheological properties of oil-well cements were examined. Due to the fact that SiO2 can be uniformly coated onto the PVAF surface, such modified PVAF can slightly improve the rheology of the cement slurry, while the raw PVAF exhibits poor dispersion at a high dosage. Compared with those of cement stone without PVAF after curing for 28 days at 60 °C, the flexural strength, compressive strength, and elastic modulus of the cement stone incorporated with the modified PVAFs were enhanced by 37.7%, 66.1%, and 50.0%, respectively. The SEM test (EDX) test, XRD test, and thermogravimetric test prove that the SiO2 coating on the PVAF surface can promote the hydration of cement clinker and can react with Ca(OH)2 to generate CSH gel. The SiO2 grafted onto the surface of PVAFs can improve the bond strength at the fiber/cement matrix interface, thus improving the mechanical properties of cement stone.

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“…In the study where the effect of clinker mineral component and nanomaterials (nano-SiO2, nano-CaCO3 and nano-TiO2) on cement composites was investigated [13], HCSC's (high content calcium silicate phase cement) curing time is shortened and its strength is significantly increased. There are some studies [14][15][16] investigating the nano-calcium carbonate effect like these, and the general conclusion from these studies is that the use of calcium carbonate as nanoparticles improves the mechanical and strength properties of the systems in which it is used.…”

Section: Introductionmentioning

confidence: 99%

Nükleer Reaktörlerde Nanoparçacık Olarak Kalsiyum Karbonat Kullanımının Araştırılması

Uzun

Genç

Acır

2023

Konya Journal of Engineering Sciences

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In this study, calcium carbonate (CaCO3) was considered as nanoparticle. In the first part of the study, half-value layer (HVL) and mean free path (MFP) values, which are radiation shielding parameters, were investigated in determined energy ranges by Phy-X open access software. At increasing energy levels, the HVL value reached approximately 10 cm, while the MFP value reached approximately 17 cm. In the second part of the study, the reactor core geometry was modeled with the MCNP code and then the relative power distribution values were determined. COBRA code input was prepared with the determined relative power distribution values and thermal analyzes were made. These analyzes were performed for three different nanoparticle ratios. As a result of the analysis, the temperature value at the end of the channel was 613 K when only water was used as a coolant, while the temperature value at the end of the channel was 611.19 K when 0.03% nanoparticles were used. Although the coolant temperature increased with the nanoparticle ratio, it was observed that the temperature decreased when only water was used.

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Multiple effects of nano-CaCO3 and modified polyvinyl alcohol fiber on flexure–tension-resistant performance of engineered cementitious composites

Cited by 9 publications

References 32 publications

Investigation of the Mechanical, Microstructure and 3D Fractal Analysis of Nanocalcite-Modified Environmentally Friendly and Sustainable Cementitious Composites

Investigation of the Mechanical, Microstructure and 3D Fractal Analysis of Nanocalcite-Modified Environmentally Friendly and Sustainable Cementitious Composites

An Investigation into PVA Fiber Modified with SiO2 for Improving Mechanical Properties of Oil-Well Cements

Nükleer Reaktörlerde Nanoparçacık Olarak Kalsiyum Karbonat Kullanımının Araştırılması

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