Topic
Silica fume
About: Silica fume is a research topic. Over the lifetime, 10177 publications have been published within this topic receiving 173857 citations.
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TL;DR: In this paper, a fire test was conducted on 2 specimens, one of high strength concrete and the other of normal strength concrete, and it was found that the length of the path for moisture to escape also has a significant influence on the spalling of high-strength concrete.
Abstract: A fire test was conducted on 2 specimens, one of high strength concrete and the other of normal strength concrete. At the time of test, sepcimen strengths were 27 and 105 MPa respectively. Details of the beam slabs and the specimens are described. The specimens were tested after 3.5 months of drying in an indoor environment. Explosive spalling was observed in high strength concrete while no spalling occurred in the normal strength concrete. However, spalling in the high strength concrete was confined to a region with 75 mm cover to steel. It was also found that the length of the path for moisture to escape also has a significant influence on the spalling of high-strength concrete.
179 citations
TL;DR: In this paper, the effects of a recently developed shrinkage-reducing admixture on high-performance concrete properties are described, and the results show that the shrinkage reducing admixture effectively reduced shrinkage of highperformance concrete, and resulted in a significant decrease in restrained shrinkage cracking.
177 citations
TL;DR: In this article, an alternative approach for the evaluation of efficiency factor k of a pozzolanic material has been introduced, based on the strength-W/C ratio rule, which calculates efficiency in terms of relative strength and cementitious materials content.
176 citations
01 Jan 2009
TL;DR: In this paper, the authors examined the effect of 5-70 nm SiO2 nanoparticles on the mechanical properties of nano-cement materials and the strength development of portland cement with nano-SiO2 and superplasticizing admixture.
Abstract: The reported research examined the effect of 5-70 nm SiO2 nanoparticles on the mechanical properties of nano-cement materials The strength development of portland cement with nano-SiO2 and superplasticizing admixture was investigated Experimental results demonstrate an increase in the compressive and flexural strength of mortars with developed nanoparticles The distribution of nano-SiO2 particles within the cement paste plays an essential role and governs the overall performance of these products Therefore, the addition of a superplasticizer was proposed to facilitate the distribution of nano-SiO2 particles Superplasticized mortars with 025% of selected nano-SiO2 demonstrated a 16% increase of 1-day compressive strength, reaching 639 MPa; the 28-day strength of these mortars was 959 MPa (vs strength of reference superplasticized mortars of 921 MPa) Increase of 28-day flexural strength of superplasticized mortars with selected nano-SiO2 was 18%, reaching 271 MPa It is concluded that the effective dispersion of nanoparticles is essential to obtain composite materials with improved performance
175 citations
TL;DR: In this paper, a phenomenological model has been proposed with a view to explaining the expanded polystyrene (EPS) concrete particle size effect and predicting its normalized compressive strength according to the concrete (macro) porosity (p) and to the ratio ϕ l c, where (lc) is the width of the EPS concrete matrix fracture process zone (FPZ).
175 citations