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Showing 1 to 20 of 53 for “"Silica fume"”.
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Sulfate soil stabilisation with silica fume-based binders
… this research examines the viability of using silica fume (a by-product of silicon industry) as a partial replacement of different high/low/non-calcium-based binders to restrict the ettringite formation and suppress the expansion associated thereof. To do so, this study relied on the use of …
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Freeze-thaw durability of high strength silica fume concrete
… concrete with water to cementitious (cement plus silica fume) ratio of 0.25 to 0.32, with and without entrained air, were tested for freeze-thaw durability in accordance with ASTM C666, procedure A (freezing and thawing in water). In addition, another set of similar specimens were moist cured for …
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The effects of utilizing silica fume in Portland cement pervious concrete
Silica fume has long been used as a supplementary cementing material to provide a high density, high strength, and durable building material. Silica fume has a particle size a fraction of any conventional cement, which allows it to increase concrete strength by decreasing the porosity especially …
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The fracture toughness of silica fume concrete using experimental and numerical techniques
… materials. One such material is condensed silica fume (CSF) which is an industrial by-product and until recently was discarded as waste. Research has shown that the addition of CSF to concrete can have the dual benefits of increased strength and improved durability.<br/>In the present study …
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The performance of a blended PFA/GGBS alkali-activated concrete using a silica fume-based activator
… using an alkali source. Nevertheless, sodium silicate is an attractive ‘alkali activator’ but has been reported to contribute up to 75% of the total embodied carbon in AAC. This research reports on the development of an eco-friendly alternative (sodium silicate) activator derived from …
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Complete stress-strain characteristics of high performance concrete
… admixtures such as fly ash, slag cement, and silica fume, ground granulated blast furnace slag, as well as air-entraining agents are commonly used in the field construction. It has been found that high perforinance concrete can improve the workability, ultimate strength and durability of the …
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The influence of high performance matrices on fracture behavior of concrete
… of micro particle pozzolanic materials such as silica fume and fly ash is known to improve the strength of concrete, but its contributions to fracture behavior remains unclear. In this study, the influence of replacing cement by silica fume and fly ash on the cement matrix-coarse aggregate …
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Sorption and desorption of selenium in cement formulations
… (45%, 50%, 55%), three weight percentages of silica fume (0%, 10%, 20%), and three weight percentages of clay (0%, 3%, 5%) were evaluated for their ability to effectively sorb selenium at three pH levels (5.9, 8.7, 12.4). A Type V Portland cement was utilized. Distribution coefficients …
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Monitoring Early Age Cementitious Materials Using Ultrasonic Guided Waves
… (accelerant and retardant), mineral admixtures (silica fume and fly ash), and coarse aggregate (pea gravel). The time of setting and compressive strength of the various mixtures was determined in accordance with ASTM standards. Experimental results provide evidence that the setting times and …
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Co-Extrusion of Cement -Based Materials to Achieve Functionally Graded Microstructure
… amount of montmorillonite, with combination of silica fume, polyethylene glycol and superplasticizer was found to be efficient to reduce air voids in extrudates.
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The influence of binder type and cracking on reinforcing steel corrosion in concrete
… in South Africa (slag, fly ash,and condensed silica fume) and performed under laboratory conditions at 30°C.
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Mitigating alkali silica reaction in recycled concrete
… concrete aggregate (RCA) that had shown alkali silica reaction (ASR) distress was evaluated. It was found that ASR mitigation was needed to prevent continued expansion. Several mitigation methods were evaluated and compared to conventional concrete using the testing procedures of ASTM C …
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Modeling the Time to Corrosion Initiation for Concretes with Mineral Admixtures and/or Corrosion Inhibitors in Chloride-Laden Environments
… and of concretes with fly ash, slag cement, and silica fume and a concrete with silica fume and a corrosion inhibitor are presented. The specimens were built to simulate four exposure conditions typical for concrete bridges located in the coastal region or inland where deicing salts are used. The …
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Chloride binding and desorption mechanism in blended cement containing supplementary cementitious materials exposed to de-icing brine solutions
… materials (SCMs) like fly ash, slag, and silica fume. Results indicated that the type of cation in the brine solution influenced bound chloride levels, with SCMs improving chloride binding capacity. Slag inclusion was effective in promoting chloride binding, while silica fume showed the …
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The Influence of Amorphous, Sub-Micrometer Silica Particles in Cement Pastes and Mortars with Very Low Water-to-Cement Ratios (Ultra-High Performance Concrete)
… the influence of amorphous, sub-micrometer silica particles in UHPCs. The present literature is equivocal about whether silica enhances clinker hydration due to its dissolution and subsequent pozzolanic reaction to calcium–silicate–hydrate phases (C–S–H phases) and/or due to a heterogeneous …
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Durability studies of high performance concrete used for bridge decks
… materials (SCM), such as fly ash, slag, silica fume and metakaolin as single or combined admixtures; normal Portland cement, chemical admixtures, and WV sources of limestone and gravel. Durability evaluations included: electrical indications of chloride penetration, chloride ion diffusion …
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Physical performance and durability evaluation of rubberized concrete
… = 0.35) specimen containing CR with and without silica fume. From test results, it was clearly seen that 10% crumb rubber addition as sand replacement provide good resistance against abrasion. Meanwhile, compressive strength was the most important factor affecting the abrasion resistance, where …
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EFFECT OF CRACK-REDUCING TECHNOLOGIES AND SUPPLEMENTARY CEMENTITIOUS MATERIALS ON SETTLEMENT CRACKING OF PLASTIC CONCRETE AND DURABILITY PERFORMANCE OF HARDENED CONCRETE
… cementitious materials (SCMs) slag cement and silica fume. Some concrete mixtures contained combinations of these technologies, such as supplementary cementitious materials and internal curing. Both crack length and width were measured. The study of durability included 28 concrete mixtures, …
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Sustainable 3D Concrete Printing for Eco-conscious Construction: Recycled Aggregates and Low-carbon Binders
… cementitious materials (SCMs) such as fly ash, silica fume, slag, and metakaolin, while simultaneously increasing the aggregate-to-binder ratio to 1.75. Printable mixtures were developed with 60% of the total binder volume consisting of SCMs. The first three mixtures developed using this …
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Experimental studies of sorption and transport of moisture in cement based materials with supplementary cementitious materials
… and mortars (OPC, OPC + 70% slag and OPC + 10% silica fume) with three different w/b –ratios (w/b) for cement paste (0.6, 0.5, 0.4) and two different w/b for cement mortar (0.5, 0.4). Sorption isotherms were determined for cement pastes and mortars in both hygroscopic and the super-hygroscopic …
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