Effects of nano-SiO2 and nano-Al2O3 on mechanical and durability properties of cement-based materials: A comparative study

Abstract Cement-based materials have been widely used in bridge construction. In order to further improve their performance, this study analyzed the modification and optimization functions of nano-SiO2 materials, designed test specimens with different content of nano-SiO2 and conducted experiments on their flow performance, compression resistance, bending resistance and impermeability. The results showed that the flow performance of the materials decreased and the impermeability decreased with the increase of nano-SiO2 content. The compressive strength and flexural strength are the best when the content of nano-SiO2 is 1%. On the whole, the best content of nano-SiO2 is 1%; when the content of nano-SiO2 is 1%, all the properties of the specimens are good, which is more conducive to the construction of bridges in various complex environments. The research in this paper has made some contributions to the further application of nano-SiO2 in the optimization of building materials, which is conducive to the better development of building materials.

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Incorporation of metagabbro as cement replacement in cement-based materials: A role of mafic minerals on the physico-mechanical and durability properties

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.03.191 ◽

2019 ◽

Vol 210 ◽

pp. 256-268 ◽

Cited By ~ 3

Author(s):

Mohammed A. Rashwan ◽

El Saeed R. Lasheen ◽

Basel N. Shalaby

Keyword(s):

Cement Replacement ◽

Durability Properties ◽

Cement Based Materials

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Analysis of the Effect of Nano-SiO2 and Waterproofing Agent on the Water Transportation Process in Mortar Using NMR

Applied Sciences ◽

10.3390/app10217867 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7867

Author(s):

Tao Meng ◽

Huadong Wei ◽

Kanjun Ying ◽

Menghua Wang

Keyword(s):

Water Absorption ◽

Moisture Diffusion ◽

Test Results ◽

Capillary Water ◽

Process Data ◽

Capillary Water Absorption ◽

Nano Sio2 ◽

Water Transportation ◽

Cement Based Materials ◽

Transportation Process

Moisture diffusion in cement-based materials significantly impacts its durability. In this study, we analyzed the effect of adding a waterproofing agent and nano-SiO2 (NS) on the water transportation process in mortar using capillary water absorption tests and nuclear magnetic resonance (NMR) technology. The results indicate that the combined action of the waterproofing agent and nano-SiO2 drastically reduce the capillary water absorption coefficient and have a more significant impact than only adding the waterproofing agent. The moisture diffusion in different sections of the mortar during the water absorption process is obtained from the NMR test results and two function models. Comparative studies indicate that the NMR test results have good correlation with the capillary water absorption test results and provide accurate process data. The NMR analysis results offer a new analytical method to characterize the porosity of cement-based materials by continuously monitoring small-pitch sections.

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