Journal ArticleDOI
Investigations on the development of powder concrete with nano-SiO2 particles
TLDR
In this article, the compressive strength of cement mortar with the addition of silica fume was evaluated at various water-cementitious ratio, including 0.23, 0.25, 0, 32, 35, and 0.48, and four contents of nano-SiO2 particles, 3, 6, 9, and 12%.Abstract:
The nano scale of particles can result in dramatically improved or different properties from conventional grain-size materials of the same chemical composition. Therefore, it is practical to add nano-silica in particle form with 99.9% of SiO2 in nano scale to improve the characteristics of cement mortar. The compressive strengths of cement mortar were evaluated at various water-cementitious ratio. Five different water-cementitious ratios were used including, 0.23, 0.25, 0.32, 0.35, and 0.48 and four contents of nano-SiO2 particles, 3%, 6%, 9%, and 12% by weight of cement. The compressive strength of cement mortar with the addition of silica fume were also evaluated at w/cm ratio of 0.48 to compare with mortar containing nano-SiO2 particles and three contents of silica fume were: 5%, 10% and 15% by weight of cement. The experimental results show that the compressive strengths of mortars with nano-SiO2 particles were all higher than those of mortars containing silica fume at 7 and 28 days. It was demonstrated that the nano-particles were more valuable in enhancing strength than silica fume. This paper also analyzed some available examinations to monitor the hydration progress continuously, such as SEM observation, residual quantity test for Ca(OH)2 and the rate of heat evolution. The results of the examinations indicate that the SiO2 in nano scale behave not only as a filler to improve the microstructure, but also as an activator to promote pozzolanic reactions.read more
Citations
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Journal ArticleDOI
Beneficial role of nanosilica in cement based materials – A review
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.
Journal ArticleDOI
Experimental investigation of the size effects of SiO2 nano-particles on the mechanical properties of binary blended concrete
Alireza Naji Givi,Suraya Abdul Rashid,Farah Nora Aznieta Abdul Aziz,Mohamad Amran Mohd Salleh +3 more
TL;DR: In this paper, the size effects of SiO2 nano-particles on compressive, flexural and tensile strength of binary blended concrete were investigated, and it was concluded that concrete specimens containing SiO 2 particles with average diameter of 15-nm were harder than those containing 80-nm of siO2 particles at the initial days of curing.
Journal ArticleDOI
Sol-Gel processing of silica nanoparticles and their applications.
Lok Pratap Singh,Sriman Kumar Bhattacharyya,Rajesh Kumar,G. Mishra,U. Sharma,Garima Singh,S. Ahalawat +6 more
TL;DR: The mesoporous silica nanoparticles (MSNPs) with good dispersion, varying morphology, narrow size distribution and homogeneous porous structure have been successfully prepared using organic and inorganic templates.
Journal ArticleDOI
An experimental survey on combined effects of fibers and nanosilica on the mechanical, rheological, and durability properties of self-compacting concrete
TL;DR: In this paper, the effects of nanosilica and different concrete reinforcing fibers including steel, polypropylene and glass on the performance of concrete were evaluated using Atomic Force Microscopy (AFM) and X-Ray Diffraction (XRD) techniques.
Journal ArticleDOI
The effect of Colloidal Nano-silica on workability, mechanical and durability properties of High Performance Concrete with Copper slag as partial fine aggregate
TL;DR: In this paper, the effect of colloidal nanosilica on the properties of High Performance Concrete with copper slag as fine aggregate at a constant replacement level of 40% was investigated.
References
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Book
Mathematical statistics with applications
TL;DR: In this paper, a calculus-based book presents a blend of theory and application focusing on inference making as the goal of studying probability and statistics, and features an emphasis on real-life applications of the mathematically divided techniques.
Journal ArticleDOI
Microstructure of cement mortar with nano-particles
TL;DR: In this paper, the mechanical properties of nano-Fe2O3 and nano-SiO2 cement mortars were experimentally studied and the experimental results showed that the compressive and flexural strengths measured at the 7th day and 28th day of the cement mortar mixed with the nano-particles were higher than that of a plain cement mortar.
Journal ArticleDOI
Effect of silica fume on mechanical properties of high-strength concrete
TL;DR: In this paper, the effects of binder systems containing different levels of silica fume on fresh and mechanical properties of concrete were investigated, and the results indicated that as the proportion of fume increased, the workability of concrete decreased but its short-term mechanical properties such as 28-day compressive strength and secant modulus improved.
Journal ArticleDOI
The influence of silica fume on the compressive strength of cement paste and mortar
Houssam Toutanji,Tahar El-Korchi +1 more
TL;DR: In this article, the compressive strengths of silica fume cement paste and mortar were evaluated at various water-cementitious ratios and it was shown that the increase in compressive strength of mortar containing silica-fume, as a partial replacement for cement, greatly contributes to strengthening the bond between the cement mixture and aggregate.
Journal Article
Microsilica in concrete
TL;DR: The literature on the properties of microsilica in concrete is reviewed in this article, where the authors present a review of the existing literature on micro-silica properties in concrete.