Abstract
Cement grouting material is one of the most important materials in civil construction at present, for seepage prevention, rapid repair, and reinforcement. To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the specific performance of high fluidization, early strength, and low shrinkage. In recent years, nanomaterials have been widely used to improve the engineering performance of cement grouting materials. However, the mechanisms of nanomaterials in grouting materials are not clear. Hence, a high-fluidization, early strength cement grouting material, enhanced by nano-SiO2, is developed via the orthogonal experimental method in this study. The mechanisms of nano-SiO2 on the microstructure and hydration products of the HCGA, in the case of different curing ages and nano-SiO2 contents, are analyzed through scanning electron microscopy tests, X-ray diffraction tests, differential scanning calorimetry tests, and Fourier transform infrared spectroscopy tests.
Highlights
In civil engineering, grouting is one of the most efficient and common methods for seepage prevention, rapid repair, and reinforcement [1,2]
To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the following specific characteristics: (a) high fluidization; (b) early strength; (c) low shrinkage [4]
The effects of nano-SiO2 content and curing age on engineering properties and hydration mechanisms are investigated via macroscopic tests and microscopic tests (i.e., scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR)), especially for an early age
Summary
In civil engineering, grouting is one of the most efficient and common methods for seepage prevention, rapid repair, and reinforcement [1,2]. Liu et al [22], Lang et al [23], Sargam et al [24], Ikotun et al [25], and Ren et al [26] analyzed the effects of different nanoparticles (e.g., nano-SiO2 , nano-Al2 O3 , nano-CaCO3 , nano-MgO, nano-TiO2 , grapheme oxide, and carbon nanotube) on the strength characteristics and engineering performance of different cement-based materials. Zhang et al [31] revealed the effects of micro-fine fly ash, colloidal nano-SiO2 , and superplasticizer on the rheological and mechanical properties of cement-based grouting materials. The effects of nano-SiO2 content and curing age on engineering properties and hydration mechanisms are investigated via macroscopic tests and microscopic tests (i.e., SEM, XRD, DSC, and FTIR), especially for an early age (1 day and 3 days), which is the objective and innovation of this study. The mechanisms of nano-SiO2 on the microstructure and hydration products, in the case of different curing ages, are analyzed through scanning electron microscopy (SEM) tests, X-ray diffraction (XRD) tests, differential scanning calorimetry (DSC) tests, and Fourier transform infrared spectroscopy (FTIR) tests
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