Chloride resistance of concrete containing nanoparticle-modified polymer cementitious coatings

Li, Guo; Ding, Yi; Gao, Tianyu; Qin, Yiming; Lv, Yajun; Wang, Kejin

doi:10.1016/j.conbuildmat.2021.123736

Cited by 51 publications

(18 citation statements)

References 39 publications

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“…To further study the influence of magnetite content on the micropore structure of MUHPC, the measured pore sizes were divided into harmless pores (<20 nm), mesopore (20–50 nm), middle capillary pores (50–200 nm), and macrocapillary pores (>200 nm) [ 63 , 64 ]. The histogram of pore size distribution is shown in Figure 11 .…”

Section: Resultsmentioning

confidence: 99%

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

Han

et al. 2022

Materials

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Nuclear technology benefits humans, but it also produces nuclear radiation that harms human health and the environment. Based on the modified Andreasen and Andersen particle packing model for achieving a densely compacted cementitious matrix, a new magnetite ultra-high-performance concrete (MUHPC) was designed using magnetite fine aggregate as a substitute for river sands with 0%, 20%, 40%, 60%, 80%, and 100% replacement ratios. The comprehensive properties of the developed MUHPC were tested and evaluated. These properties were fluidity, static and dynamic compressive strengths, high-temperature performance, antiradiation behaviors, hydration products, and micropore structures. Experimental results indicate that the developed MUHPC has high work performance and static and dynamic mechanical properties. The gamma ray shielding performance of MUHPC substantially improves with increased magnetite fine aggregate. Corresponding with 100% magnetite fine aggregate substitution, the linear attenuation coefficient of MUHPC is enhanced by 56.8% compared with that of ordinary concrete. Magnetite addition does not change the type of cement hydration products but improves the micropore structures of MUHPC and effectively reduces its total porosity and average pore diameter, thereby contributing to its mechanical and radiation shielding properties. The compressive strength and linear attenuation coefficient of the MUHPC can reach 150 MPa and 0.2 cm−1, respectively. In addition, the MUHPC also exhibits superior mechanical and radiation shielding performance at elevated temperatures (<400 °C). Finally, high strength and antiradiation performance support the use of MUHPC in radiation protection materials in the future.

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Section: Resultsmentioning

confidence: 99%

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

Han

et al. 2022

Materials

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“…All of the identified parameter values fall into the reasonable ranges of literature values. 4,24,39,40 Figure 4 compares the simulated weight increment and penetrating concentration with the experimental values for all three coatings. The point closer to the 1:1 line indicates a better agreement between the simulated and experimental results.…”

Section: Parameter Identification Resultsmentioning

confidence: 99%

Integrated Experimental and Modeling Approach to Evaluate Surface Crystallization on Polymer Coatings

Shen

et al. 2022

Ind. Eng. Chem. Res.

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Resistance to surface crystallization of polymer building coatings is a significant performance index for coating design. However, the high time expense of conventional surface crystallization experiments limits the efficiency of coating evaluation. In this study, an integrated experimental and modeling approach is proposed to evaluate surface crystallization on polymer coatings. Two models are developed as well as the surrogate-based optimization method is adopted to identify model parameters, and a transport-crystallization coupled model is constructed to predict the surface crystallization using the identified parameters. The effectiveness of the integrated approach is validated in three different coatings. It shows that the parameter identification method can estimate model parameters properly and provide good fitting results. In addition, the coupled model shows satisfactory accuracy when predicting surface crystallization. Furthermore, the analysis of the simulation results indicates that the coupled model could be instructive for coating design since it reveals the quantitative relationship between the surface crystallization resistance and macroscopic coating properties.

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“…Water molecules, oxygen, carbon dioxide, and chloride ions in the air can all be effectively prevented from entering the concrete by coating the building surface. Guo Li [ 20 ] synthesized a novel nano polymer-modified cementitious (PMC) coating by adding nano-SiO 2 or nano-TiO 2 suspension to acrylic emulsion. The nano-SiO 2 or nano-TiO 2 suspension can reduce the porosity of the coating, and the service life of the coated concrete against chloride attack can be extended by 7.1 times or 2.8 times with the addition of 0.5% nano-SiO 2 or nano-TiO 2 to the PMC coating.…”

Section: Introductionmentioning

confidence: 99%

Study on a Hydrogel for Adsorption of Chloride Ions in Cementitious Materials

Cao

Zhang

et al. 2022

Polymers

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Chloride ions in the seaside environment can corrode the steel reinforcement in concrete, which greatly endangers the safety of seaside structures. As an excellent adsorption material, hydrogel is widely used in the field of water treatment but is rarely used in cementitious materials. In this study, a polyacrylamide–chitosan hydrogel (PAMC) was prepared with N,N-methylenebisacrylamide as the cross-linking agent and acrylamide as the monomer. The prepared PAMC gel could effectively adsorb chloride ions in simulated seawater and simulated sea sand environments, and the maximum adsorption capacity of chloride ions by PAMC-1 (prepared from 2.5 g acrylamide and 1% content of N,N-methylenebisacrylamide relative to acrylamide) gels in simulated seawater was 55.53 mg/g. The adsorption behavior of the PAMC gels in solution fit the Langmuir isotherm model. The composition and morphology of the PAMC gel were characterized, and the responsiveness of the PAMC gel to the environment was studied. The results showed that the PAMC gels adsorbed better in alkaline environments and thus could be used in alkaline cement-based environments. The mortar sample containing the PAMC-1 gel had higher resistance to chloride ion penetration, and the chloride ion content at 7.5–10mm from the surface of the sample cured for 28 days was reduced by 41.4% compared to the samples without the gel.

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Chloride resistance of concrete containing nanoparticle-modified polymer cementitious coatings

Cited by 51 publications

References 39 publications

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

Preparation and Comprehensive Properties of a High-Radiation-Shielding UHPC by Using Magnetite Fine Aggregate

Integrated Experimental and Modeling Approach to Evaluate Surface Crystallization on Polymer Coatings

Study on a Hydrogel for Adsorption of Chloride Ions in Cementitious Materials

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