A waterproofing additive for cement and/or concrete comprising a pozzolanic material (such as silica fume, refined natural microsilica or metakaolin) modified with a hydrophobic material (such as butyl stearate, calcium stearate, oleic acid or a silicon emulsion).
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Chemical and physico mechanical properties of composite cemeents containing micro and nano silica
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Apr 30, 2020· Sika opens first concrete admixture production plant in Ethiopia: Article ... Nano-Silica influences the properties of recycled concrete: Article Fines content affects packing density in concrete: Article Hydration of cement regenerated from recyclable concrete: ...
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GB2131409A GB08332361A GB8332361A GB2131409A GB 2131409 A GB2131409 A GB 2131409A GB 08332361 A GB08332361 A GB 08332361A GB 8332361 A GB8332361 A GB 8332361A GB 2131409 A GB2131409 A GB 2131409A Authority GB United Kingdom Prior art keywords microsilica weight water reducing agent concrete Prior art date Legal status (The legal status is an …
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The invention relates to a procedure for the admixture of silicon oxide to a hydraulic cement slurry, particularly for well cementing, and is characterized by amorphus silica with particles smaller than 1 micro-metre being mixed with water to a liquid micro-silica, silica flour with particles from 2 to 200 micro-metres being mixed in said liquid micro-silica and the thereby obtained silica ...
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Sika has been producing high quality, innovative technologies for concrete, beginning with the first product named Sika®-1, which is still in the Sika product portfolio today. 20,000 metric tons of Sika concrete admixtures were used in the record-breaking Gotthard base tunnel project.
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This study presents the results of an experimental investigation of the effects of nanosilica (NS) on the strength development, transport properties, thermal conductivity, air-void, and pore characteristics of lightweight aggregate concrete (LWAC), with an oven-dry density <1000 kg/m3. Four types of concrete mixtures, containing 0 wt.%, 1 wt.%, 2 wt.%, and 4 wt.% of NS were prepared. The ...
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ABSTRACT: Materials of the cement concrete consist of sand, rocks, cement, admixtures (nano SiO 2 (NS); silica Fume (SF), Sika Viscocrete 3000 - 20) and water which are main ingredients for producing a mixture of cement concrete. The experimental study was conducted with the combination of statistical analysis and data processing based on the ...
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Sep 01, 2020· Admixtures are materials added to concrete before or during mixing. Most admixtures are chemicals that change some property of the fresh or hardened concrete. Water, aggregates, cementitious materials (pozzolans and hydraulic cements [fly ash, silica fume, slag cement]), and fiber reinforcement are not considered admixtures. Types of chemical admixtures include: air-entraining admixtures ...
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Shotcrete Solutions; Sika is the expert in all sprayed concrete technologies, including both wet and dry spray processes. This allows us to provide the optimum solution for each type of project and application, including the development of our own Aliva sprayed concrete machines.When combined with our research, development and globalized production of specialized sprayed concrete admixtures ...
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The use of a viscosity modifying admixture (VMA) increases the cohesiveness of concrete, thereby reducing the risk of segregation. Sika's Viscoscity Modifying Admixtures meet relevant industry standards per application, such as ASTM C-494, Type S or …
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MECHANICS PROPERTIES OF NANO-SILICA MATERIAL CONCRETE Saloma1, Amrinsyah Nasution2, Iswandi Imran3 and Mikrajuddin Abdullah4 1 Lecturer, Faculty of Civil Engineering, Sriwijaya University, Figure 4 Gradation curve of materials Admixtures Admixtures used in the concrete mix was Sika ViscoCrete 20 HE Material specifications is shown in Table 5
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Jan 01, 2016· 9.1. Introduction. Chemical admixtures are nowadays very important for concrete design, and are essential for the formulation of concrete with a low environmental impact (Flatt et al., 2012).Chemical admixtures can modify the properties of fresh or hardened concrete …
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Apr 01, 1985· Finer than fly ash, this pozzolan increases strength and density, reduces concrete permeability. Microsilica is a mineral admixture composed of very fine solid glassy spheres of silicon dioxide. Most microsilica particles are less than 1 micron (0.00004 inch) in diameter, generally 50 to 100 times finer than average cement or fly ash particles ...
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Jan 30, 2018· Over the past few years, micro silica (mSi) and nano silica (nSi) have been the most used admixtures in continuing research into the areas of civil and agricultural engineering. This paper examines the behavior of 10 mixtures of SCC prepared with binary and ternary dosages through use of Portland cement (CEM I 52.5 R), mSi and nSi.
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A COMPLETE RANGE OF CONCRETE ADMIXTURES. For more than a century, Sika has been producing high quality, innovative admixture technologies for concrete. Sika's first product, appropriately named "Sika 1", was a concrete admixture that allowed for the electrification of tunnels in Europe by waterproofing the concrete that lined the interior.
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Nov 13, 2018· In the cement and concrete field, nano-structural models of Calcium Silicate Hydrate (C-S-H), have allowed researchers to develop particles to improve and increase C-S-H formation.
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Silica Fume and Fly ash - View presentation slides online. Silica Fume and Fly ash
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Elkem EMSAC 500 S is a liquid additive for concrete based on Sika Silica Fume Technology for use in highly durable concrete. Get Price; sika and nano silica concrete admixtures 10463. 7 CHEMICAL AND PHYSICO MECHANICAL PROPERTIES - sika and nano silica concrete admixtures 10463 producing ecological profile concrete or as admixtures . Get Price
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ABSTRACT. The compressive strength, flexural strength, porosity and electrical resistivity properties of cement mortars with nano-Fe 2 O 3 and nano-SiO 2 are studied. Amorphous silica is the main component of pozzolanic materials due to its reaction with calcium hydroxide formed from calcium silicate (C 3 S and C 2 S) hydration. The pozzolanic reaction rate is not only proportional to the ...
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CONCRETE Sika Admixtures Technology EXPERIENCE AND MARKET LEADERSHIP IN CONSTRUCTION CHEMICALS More than 4,000 Sika specialists visit Since 1910 Sika has provided products and systems with a clear mission: to optimise the construction process. We …
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May 18, 2020· Air-entraining admixtures are used to purposely introduce and stabilize microscopic air bubbles in concrete. Based on special surfactants, these admixtures cause tiny air bubbles < 0.3mm in diameter to stabilize within the cement paste. This air helps to prevent the concrete from cracking and scaling as a result of frost action.
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Sika® Plastocrete®-161 water reducing admixture provides an economical and highly effective means of reducing the amount of mixing water required to produce concrete of a certain slump by acting as a dispersant for the cement particles in the mix.
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Sika develops and markets a complete range of admixtures and additives for use in concrete, cement and mortar production. These products enhance specific properties of the fresh and hardened concrete, such as workability, watertightness, durability, or early and final strength.
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Sika Latex Waterproofing Admixture 20L Description Sika Latex is a modified Styrene Butadiene emulsion to be mixed with cement (neat) or cement/ sand mortar for improved adhesion and water resistant properties Sika-Latex is a high quality emulsion that substantially increases the qualities of cement mortars, such as:&nb
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Sika opens first concrete admixture production plant in Ethiopia: Article ... Nano-Silica influences the properties of recycled concrete: Article Fines content affects packing density in concrete: Article Hydration of cement regenerated from recyclable concrete: ...
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Jul 10, 2019· Many studies have evaluated the effects of additives such as nano-silica (NS), micro-silica (MS) and polymer fibers on optimizing the mechanical properties of concrete, such as compressive strength. Nowadays, with progress in cement industry provides, it has become possible to produce cement type I with strength classes of 32.5, 42.5, and 52.5 MPa.
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Dec 18, 2017· The admixture is dosed in two parts per cubic yard: a silica-rich liquid at up to 1 gal. plus a dry catalyst at up to 1 lb. per 100 lbs. of cement. The nano-silica in CoolCure bears the same basic chemical profile as silica sand or silicon dioxide (SiO 2 ), but at one-millionth a typical grain's gradation.
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ment of nano-silica had negative effect on worka-bility of concrete and demand of water also in-creased [10]. In high volume fly ash concrete with nano-silica, cement was replaced 2% and 4% by nano-silica, and in high volume slag concrete nano-silica dosage from 0.5% to 2% by mass of cement was observed to increase the compressive strength
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