scispace - formally typeset
Search or ask a question
Topic

Silica fume

About: Silica fume is a research topic. Over the lifetime, 10177 publications have been published within this topic receiving 173857 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the role of permeability in sulphate attack was evaluated by determining the expansion caused in concrete specimens with exposure to 5% Na2SO4 solution, and the results showed that the relative performance of concretes cannot be explained by either their permeability only or by only the chemical resistance of the binder.

95 citations

Journal ArticleDOI
TL;DR: In this article, the retention of sodium and potassium by a hydrated low-pH cement comprising 60% Portland cement and 40% silica fume was investigated, and it was shown that the sorption of potassium is higher than that of sodium.

95 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the influence of drying on hydration of high-strength concrete with water-binder ratios of 0.25, 0.35 and 0.45.

95 citations

Journal ArticleDOI
TL;DR: In this article, a simple method of growing the desirable carbon nanomaterial directly on the surface of matrix particles was proposed, where CNTs and CNFs were synthesised on the surfaces of model object, silica fume particles impregnated by iron salt, and directly on pristine cement particles, naturally containing iron oxide.
Abstract: In order to create strong composite materials, a good dispersion of carbon nanotubes (CNTs) and nanofibers (CNFs) in a matrix material must be obtained. We proposed a simple method of growing the desirable carbon nanomaterial directly on the surface of matrix particles. CNTs and CNFs were synthesised on the surface of model object, silica fume particles impregnated by iron salt, and directly on pristine cement particles, naturally containing iron oxide. Acetylene was successfully utilised as a carbon source in the temperature range from 550 to 750°C. 5-10 walled CNTs with diameters of 10-15nm at 600°C and 12-20nm at 750°C were synthesised on silica particles. In case of cement particles, mainly CNFs with a diameter of around 30nm were grown. It was shown that high temperatures caused chemical and physical transformation of cement particles.

95 citations

Journal ArticleDOI
TL;DR: In this article, the presence of synergistic effects in ternary cementitious systems containing portland cement (OPC), class C fly ash (FA) and silica fume (SF) was verified.
Abstract: This research was primarily conducted to verify the presence of synergistic effects in ternary cementitious systems containing portland cement (OPC), class C fly ash (FA) and silica fume (SF). A subsequent objective of the study was to quantify the magnitude of the synergy and to determine its source. For a ternary mixture containing 20% FA and 5% SF by mass, the synergistic effect was observed mostly at later ages (7 days onward) and it resulted in an increased compressive strength and resistance to chloride ion penetration as well as a reduced rate of water absorption (sorptivity) compared to predictions based on individual effects of FA and SF in respective binary systems. The observed synergy was attributed to both chemical and physical effects. The chemical effect manifested itself in the form of an increased amount of hydration products. The physical effect associated with packing density was, somewhat contrary to general belief, not due to an optimized particle size distribution of the binder components of the ternary cementitious system. Instead, it was the result of smaller initial inter-particle spacing caused by lower specific gravities of both FA and SF which, in turn, led to a lower volumetric w/cm. If the mixture design was adjusted to account for these differences, the physical effect would be diminished.

95 citations


Network Information
Related Topics (5)
Compressive strength
64.4K papers, 1M citations
89% related
Ultimate tensile strength
129.2K papers, 2.1M citations
76% related
Fracture mechanics
58.3K papers, 1.3M citations
75% related
Corrosion
152.8K papers, 1.9M citations
74% related
Fracture toughness
39.6K papers, 854.3K citations
74% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023485
2022944
2021621
2020726
2019779