Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study on alkylsilane-incorporated cement composites: Hydration mechanism and mechanical properties effects
https://orcid.org/0000-0002-2888-7198
https://orcid.org/0000-0001-9749-7444
Abstract Three silanes with different alkyl chain lengths were incorporated into PII 52.5 ordinary Portland cement to investigate their effects on cement hydration and mechanical development. The micro-mechanism of hydration process and hydrated products were well studied using Calorimeter, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Thermal gravimetric-Differential scanning calorimetry (TG-DSC). Results demonstrated that different alkylsilanes had diverse effects on cement hydration. In general, the shorter the alkyl chain length, the stronger the retardation. Furthermore, the porosity change due to the silane incorporated could be another reason for the decrease of the mechanical properties. Additionally, SEM images show that there are some fiber-like needle products formed on the surface of hydrated cement substrate. According to EDS analysis, they are likely composed of 2,4,4-trimethyl pentyl triethoxysilane (S1) and n-dodecyl triethoxysilane (S3), which might be produced from the reaction between calcium hydroxide and silane. In terms of water absorption reduction, S1 shows the lowest water uptake, which benefits from the branched structure in alkyl group of S1.
Highlights Three silanes based on different alkyl chain length were incorporated into cement composites firstly. The micro-mechanism of hydration process and hydrated products has been well analyzed. The retardation of hydration for cement composites is evidently influenced by the shortening of alkyl chain length in silane. Cement composites with different alkylsilanes exhibit acceptable strength and promising water resistance performance. The lowest water uptake is presented by silane with the branched structure in alkyl group.
Study on alkylsilane-incorporated cement composites: Hydration mechanism and mechanical properties effects
https://orcid.org/0000-0002-2888-7198
https://orcid.org/0000-0001-9749-7444
Abstract Three silanes with different alkyl chain lengths were incorporated into PII 52.5 ordinary Portland cement to investigate their effects on cement hydration and mechanical development. The micro-mechanism of hydration process and hydrated products were well studied using Calorimeter, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Thermal gravimetric-Differential scanning calorimetry (TG-DSC). Results demonstrated that different alkylsilanes had diverse effects on cement hydration. In general, the shorter the alkyl chain length, the stronger the retardation. Furthermore, the porosity change due to the silane incorporated could be another reason for the decrease of the mechanical properties. Additionally, SEM images show that there are some fiber-like needle products formed on the surface of hydrated cement substrate. According to EDS analysis, they are likely composed of 2,4,4-trimethyl pentyl triethoxysilane (S1) and n-dodecyl triethoxysilane (S3), which might be produced from the reaction between calcium hydroxide and silane. In terms of water absorption reduction, S1 shows the lowest water uptake, which benefits from the branched structure in alkyl group of S1.
Highlights Three silanes based on different alkyl chain length were incorporated into cement composites firstly. The micro-mechanism of hydration process and hydrated products has been well analyzed. The retardation of hydration for cement composites is evidently influenced by the shortening of alkyl chain length in silane. Cement composites with different alkylsilanes exhibit acceptable strength and promising water resistance performance. The lowest water uptake is presented by silane with the branched structure in alkyl group.
Study on alkylsilane-incorporated cement composites: Hydration mechanism and mechanical properties effects
https://orcid.org/0000-0002-2888-7198
https://orcid.org/0000-0001-9749-7444
Abstract Three silanes with different alkyl chain lengths were incorporated into PII 52.5 ordinary Portland cement to investigate their effects on cement hydration and mechanical development. The micro-mechanism of hydration process and hydrated products were well studied using Calorimeter, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Thermal gravimetric-Differential scanning calorimetry (TG-DSC). Results demonstrated that different alkylsilanes had diverse effects on cement hydration. In general, the shorter the alkyl chain length, the stronger the retardation. Furthermore, the porosity change due to the silane incorporated could be another reason for the decrease of the mechanical properties. Additionally, SEM images show that there are some fiber-like needle products formed on the surface of hydrated cement substrate. According to EDS analysis, they are likely composed of 2,4,4-trimethyl pentyl triethoxysilane (S1) and n-dodecyl triethoxysilane (S3), which might be produced from the reaction between calcium hydroxide and silane. In terms of water absorption reduction, S1 shows the lowest water uptake, which benefits from the branched structure in alkyl group of S1.
Highlights Three silanes based on different alkyl chain length were incorporated into cement composites firstly. The micro-mechanism of hydration process and hydrated products has been well analyzed. The retardation of hydration for cement composites is evidently influenced by the shortening of alkyl chain length in silane. Cement composites with different alkylsilanes exhibit acceptable strength and promising water resistance performance. The lowest water uptake is presented by silane with the branched structure in alkyl group.
Study on alkylsilane-incorporated cement composites: Hydration mechanism and mechanical properties effects
Xie, Mingjun (Autor:in) / Zhong, Yijin (Autor:in) / Li, Zheng (Autor:in) / Lei, Fanghua (Autor:in) / Jiang, Zhengwu (Autor:in)
29.06.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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