Interactions between inorganic surface treatment agents and matrix of Portland cement-based materials

Pan, Xiaoying; Shi, Zhenguo; Shi, Caijun; Xiang, Huimin; Wu, Liqun

doi:10.1016/j.conbuildmat.2016.03.091

Cited by 47 publications

(10 citation statements)

References 50 publications

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“…By deconvolving the sucrose-modified Fe2O3/SBA-15 in the Gaussian profile showed the fourfold are Si−O−Si (1075.32 cm −1 ), CH2 (1206.84 cm −1 ), C=C asymmetric (1616.19 cm −1 ), and C=O (1729.97 cm −1 ). Illustrates of deconvolution the appearance of three peaks in the 1200-1800 cm −1 range confirm that the sucrose modification of iron oxide/SBA-15 was successful [32]. XRD patterns of SBA-15, Fe2O3/SBA-15 and sucrose-modified Fe2O3/SBA-15 in wide-angle, and low-angle are shown in Figure 6.…”

Section: Resultsmentioning

confidence: 62%

Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue

Pertiwi

Ulfa

Saraswati

et al. 2021

Bull. Chem. React. Eng. Catal.

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Santa Barbara Amorphous (SBA-15) containing iron oxide with a sucrose-modified in a heterogeneous reaction for degradation methylene blue (MB) successful synthesized used hydrothermal, ultrasonication, and wet impregnation method. SBA-15 is mesoporous silica that can easily serve as external and internal surfaces making it suitable for a wide range of applications. The structure and morphology of materials were characterized using Surface Area Analyzer (SAA), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Transmission Electron Microscopy (TEM). Iron oxide impregnated as a maghemite phase has an average size of 12 nm and well distributed on the SBA-15. After modified with sucrose the materials remaining stable, which has a two-dimensional hexagonal (p6mm) structure, high specific surface area, and large pore volume (up to 1.82 cm3.g−1). The degradation of MB was evaluated under visible light irradiation using UV-Vis spectroscopy. Catalytic activity showed efficiencies of 52.9; 70.2; and 21.1% for SBA-15, Fe2O3/SBA-15, and sucrose-modified Fe2O3/SBA-15 respectively. Sucrose-modified Fe2O3/SBA-15 has the lowest efficiency, which probably occurs due to the presence of pore-blocking and the formation of micropores on the external pore. The modification with sucrose has the advantage of producing a high surface area even though there is a catalytic center due to partial decomposition which causes a decrease in the efficiency of degradation of MB. All materials provide a high micro surface area so that they can be further adapted and can be widely applied to many potential applications as both catalyst support and an adsorbent. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: Resultsmentioning

confidence: 62%

Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue

Pertiwi

Ulfa

Saraswati

et al. 2021

Bull. Chem. React. Eng. Catal.

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“…4b, c). The characteristic groups and wavenumbers of hardened cement stones due to GO/CNTs additives have been reported in the literature [37][38][39][40][41][42][43]. Table 6 lists these characteristic groups and wavenumbers for O-H, H-O-H, Si-O, and C-O, respectively, that correspond to calcium hydroxide, chemically bound water, calcium silicate hydrate, and calcium carbonate in hardened cement paste, respectively.…”

Section: Effects Of Go/cnts On the Mechanicalmentioning

confidence: 97%

Modification of cementitious composites with graphene oxide and carbon nanotubes

2020

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Both graphene oxide (GO) and carbon nanotubes (CNTs) are carbon-based nanomaterials. Due to their favorable dispersibility in water and excellent mechanical properties, they are potential additives for use as reinforcements in cementitious composites. In this laboratory study, GO and CNTs were simultaneously used as additives to improve the mechanical properties (e.g., compressive strength) and durability (e.g., frost resistance, water impermeability) of cementitious composites. To maintain and optimize the mortar fluidity, fly ash (20% by the mass of the cementitious materials) was also added into the cementitious composite. Based on the laboratory test results, the compressive strength of the cementitious composite was maximized to 43.50 MPa with an optimal dosage of 0.08% GO, by weight of the total mixture. Addition of 0.04% GO (by total mixture weight) and higher dosages of up to 0.08% exhibited a strengthening effect on the cement composites due to the simultaneous bridging effect of 0.15% CNTs and the nucleation effect of GO. Furthermore, the addition of GO and CNTs contributed to improving the freeze-thawing resistance and impermeability of the cementitious composites. Overall, the study results indicated that the addition of GO and CNTs could potentially improve the mechanical properties and durability of cementitious composites, which could be very beneficial for various industrial applications such as concrete roads or building constructions.

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“…Figure 3 shows that the workability of HPC is still able to be used in construction industry since the slump retention behavior of concrete with a composition of 2% PCE can be maintained until 45 mn with a slump value of 10 cm. Meaning that the proper amount of added PCE would be effective in improving the slump retention due to the addition of PCE can induce greater physico-chemical surface interactions through electrostatic interactions [10][11][12].…”

Section: Slump Retentionmentioning

confidence: 99%

Effect of added the polycarboxylate ether on slump retention and compressive strength of the high-performance concrete

Jonbi

Arini

Anwar³

et al. 2018

MATEC Web Conf.

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It is well known that workability of high performance concrete (HPC) is dependent on slump value of concrete mixture. Moreover, slump retention is the most sensitive compared to a well-known slump value because it represents the durability of concrete mixture for its applications in the field of civil engineering. This research used the polycarboxylate ether (PCE) to increase slump value of concrete mixture and then verified the effect of PCE on the slump retention and compressive strength of different high-performance concretes. 0%, 0.5%, 1%, 2% of PCE were added into concrete mixture to yield a minimum compressive strength of f’c 50 MPa. The slump retention tests were performed at 0, 15, 30, 45, 60 and 75 minutes while the compressive strength tests were carried out at 3, 7, 14 and 28 days for every concrete sample. The result findings showed that the optimal concrete performance can be achieved by adding 2% of PCE to reach at a slump retention value of 45 minutes and a compressive strength of 53.84 MPa. Effect of PCE on the slump retention and compressive strength has been verified to contribute an insight into the application of a proper designed workability of HPC.

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Interactions between inorganic surface treatment agents and matrix of Portland cement-based materials

Cited by 47 publications

References 50 publications

Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue

Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue

Modification of cementitious composites with graphene oxide and carbon nanotubes

Effect of added the polycarboxylate ether on slump retention and compressive strength of the high-performance concrete

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