Author
Zhang Zenan
Bio: Zhang Zenan is an academic researcher from Zhejiang University of Technology. The author has contributed to research in topics: Silica fume & Bond strength. The author has an hindex of 2, co-authored 2 publications receiving 1012 citations.
Papers
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TL;DR: In this paper, the influence of nano-SiO 2 (NS) addition on properties of hardened cement paste (hcp) as compared with silica fume (SF) has been studied through measurement of compressive and bond strengths of hcp, and by XRD and SEM analysis.
1,039 citations
TL;DR: In this paper, the compressive, bond and bending strength of hardened paste and concrete were measured by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and the data collected by the authors indicate that with a small amount of nano-SiO2, the Ca(OH)2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete.
Abstract: The pozzolanic activity of nano-SiO2 and silica fume was comparatively studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and the compressive, bond and bending strengths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca (OH)2 and nano-SiO2, the reaction rate of Ca (OH)2 with nano-SiO2 and the velocity of C−S−H gel formation from Ca(OH)2 with nano-SiO2 showed marked increases over those of Ca(OH)2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO2, the Ca(OH)2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete.
143 citations
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TL;DR: In this paper, the state of the field of nanotechnology in concrete is reviewed and the impact of recent advances in instrumentation and computational materials science and their use in concrete research is discussed.
1,385 citations
TL;DR: Amorphous nano-silica (nS) particles were incorporated in cement pastes and mortars, and their effect on the fresh state behavior was analysed as mentioned in this paper, where the influence of nS content was better observed on yield stress when compared with plastic viscosity values (the first increased about 66.5% while the latter just increased 3.6%).
557 citations
TL;DR: In this article, the effect of incorporating nanomaterials in low dosages to the fabrication, workability, hydration, microstructure, and mechanical properties of cement-based composites are comprehensively reviewed.
512 citations
TL;DR: In this paper, the effects of nanosilica addition on hydration kinetics, microstructure refinement, fresh/hardened properties and durability characteristics of concrete are summarized.
505 citations
TL;DR: In this paper, the pore structure and chloride permeability of concrete containing nano-particles (TiO2 and SiO2) for pavement are experimentally studied and compared with that of plain concrete, concrete containing polypropylene (PP) fibers and concrete containing both nano-TiO 2 and PP fibers.
425 citations