Effects of Microsilica (Silica Fume) on Pore‐Solution
Pore solutions expressed from hydrated Portland cement pastes containing up to 30 microsilica (silica fume) as replacement for cement were analyzed. The presence of microsilica enhances early concentrations of alkalies and hydroxyl ions but after 1 day the effect is reversed and the concentrations of these ions are progressively reduced to
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EFFECTS OF MICROSILICA CONTENT ON THE
Effects of microsilica content on the performances of lightweight castables containing porous periclase-spinel aggregates CeramicsSilikáty 54 (4) (2010) 317 RESULTS The apparent porosity and bulk density of castables sintered at 1600°C is given in Figure 2. With an increase in microsilica content the apparent porosity decreases
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(PDF) Effect of deflocculants on microsilica containing
PDF On Jan 1 2010 Mohamad Hassan Amin published Effect of deflocculants on microsilica containing ultra low Al2O3–SiC–SiO2 refractory castable Find read
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Effect of different additives on the properties of alumina
TPP. Also in this study we investigated the effect of addition of microsilica up to 4 wt. on the properties of alumina-spinel castables. Microsilica is the finest particles in the system and due to suitable distribution of microsilica among other particle the open porosity reduced and
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The effect of nano-size additives on the electrical
May 01 2010 · According to the supplier instruction FS 20 is a suitable dispersant for microsilica containing compositions which has been confirmed through the results of this study . Based on these results the length and shape of deflocculant molecule have a great effect on the dispersion mechanism.
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CiteSeerX — Properties of Suspension and Pastes of
CiteSeerXDocument Details (Isaac Councill Lee Giles Pradeep Teregowda) Microsilica is currently being used in a wide range of refractory castables and its quality influences performance particularly flow and set of castables. In the present work two different types of microsilica "Elkem ASA Materials" (grade 983U) and polish "Silimic " have been investigated.
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Effect of different additives on the properties of alumina
TPP. Also in this study we investigated the effect of addition of microsilica up to 4 wt. on the properties of alumina-spinel castables. Microsilica is the finest particles in the system and due to suitable distribution of microsilica among other particle the open porosity reduced and
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Deflocculants A Detailed Overview
Some clays can be easily deflocculated using compounds which raise pH such as sodium silicate or sodium carbonate as these contain organic material which can react in the presence of an alkaline environment forming deflocculant compounds. Bibliography P. Prampolini Ceramica Informazione 311 1992 pag.88. MOST COMMON DEFLOCCULANTS Sodium
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Deflocculants A Detailed Overview
Some clays can be easily deflocculated using compounds which raise pH such as sodium silicate or sodium carbonate as these contain organic material which can react in the presence of an alkaline environment forming deflocculant compounds. Bibliography P. Prampolini Ceramica Informazione 311 1992 pag.88. MOST COMMON DEFLOCCULANTS Sodium
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A new generation of deflocculants and microsilica used to
An efficient deflocculant for a conventional refractory castable based on a chamotte filler is proposed. Aparticle distribution analysis is given for a dry castable mix containing microsilica and the physicomechanical properties of the conventional refractory castable modified with microsilica and Castament FS40 polycarboxylate deflocculant are studied.
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(PDF) Effect of deflocculant on microsilica containing
The effects of six additives i.e. sodium tripolyphosphate (JPP) sodium hexametaphosphate (SHMP) Rheobuild Darvan Glenium and Castament on rheological behavior of microsilica containing ultra
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(PDF) The effect of deflocculants on the self-flow
The effect of various deflocculants on the castable self-flow vs. deflocculant content (6 wt. water was added to the castable). S. Otroj et al. / Ceramics International 31 (2005) 647–653 651 potential of the system hence reducing the viscosity and The deflocculant absorbed on the powder surfaces not increasing the flowability 5 .
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Properties of Suspension and Pastes of Different Types of
of middle cement castable which contains in its composition with microsilica of low quality may be increased considerably if the right amount of the right deflocculant is added. Keywords microsilica deflocculants pH electric conductivity viscosity rheological properties. 1. INTRODUCTION∗ Presently the traditional refractory castables
Get PriceReference TP-GB-RE-LAF-063 Page 1/12 A NEW BINDER
deflocculant the microsilica filler and the calcium aluminate cement. As an example the interaction between sodium tri-polyphosphate and calcium aluminate in a silica fume containing castable has been studied 1 . Figure 1 shows the evolution of the ionic concentration in the pore solution of the concrete during the early phase after mixing
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The effect of deflocculants on the self-flow
Jan 01 2005 · The deflocculant absorbed on the powder surfaces not only impedes the absorption of the calcium ions but also creates negative charges on the particle surfaces of the matrix suspension resulting in repulsive forces. Hence a better dispersion of the particles is achieved.
Get Price(PDF) EFFECT OF MICRO-SILICA AND NANO-SILICA ON
The work involves using four types of mixes the first one includes normal mix concrete containing 0 microsilica and 0 nanosilica the second one includes replacing the cement with different percentages of microsilica (7 8 9 ) the third one includes replacing the cement with different percentages of nanosilica (1 2 3 ) and the fourth
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Silica fumeWikipedia
Silica fume also known as microsilica (CAS number EINECS number ) is an amorphous (non-crystalline) polymorph of silicon dioxide silica.It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm.
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The corrosion resistance of microsilica-containing Al2O3
Aug 01 2012 · Microsilica addition in Al 2 O 3 –MgO and Al 2 O 3 –spinel castables helps to improve their flowability and partially accommodate their residual expansion after firing. Nevertheless there is a lack of conclusive statements in the literature regarding the effects of microsilica on one of the main requisites for steel ladle refractories corrosion resistance.
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The corrosion resistance of microsilica-containing Al2O3
Aug 01 2012 · Microsilica addition in Al 2 O 3 –MgO and Al 2 O 3 –spinel castables helps to improve their flowability and partially accommodate their residual expansion after firing. Nevertheless there is a lack of conclusive statements in the literature regarding the effects of microsilica on one of the main requisites for steel ladle refractories corrosion resistance.
Get PriceA new generation of deflocculants and microsilica used to
The effects of six additives i.e. sodium tripolyphosphate (JPP) sodium hexametaphosphate (SHMP) Rheobuild Darvan Glenium and Castament on rheological behavior of microsilica containing ultra
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The effect of nano-size additives on the electrical
May 01 2010 · According to the supplier instruction FS 20 is a suitable dispersant for microsilica containing compositions which has been confirmed through the results of this study . Based on these results the length and shape of deflocculant molecule have a great effect on the dispersion mechanism.
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The Effect of Deflocculants on the Structure and Physical
Content of deflocculant EC mSm/cm 0 2 4 6 8 10 12 pH NT EC FC EC NT pH FS pH Fig. 1. Effect of deflocculant NT and FS content on pH and EC values of aqueous solutions Since in MCC-type castableone of the main binder components is SR the effect of deflocculant content (from 0.125 to 0.5 ) on pH and EC changes in the suspen-
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EFFECTS OF MICROSILICA CONTENT ON THE
Effects of microsilica content on the performances of lightweight castables containing porous periclase-spinel aggregates CeramicsSilikáty 54 (4) (2010) 317 RESULTS The apparent porosity and bulk density of castables sintered at 1600°C is given in Figure 2. With an increase in microsilica content the apparent porosity decreases
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(PDF) 2010- Industrial Ceramics -Effect of deflocculants
2010- Industrial Ceramics -Effect of deflocculants on microsilica containing ultra low Al2O3–SiC–SiO2 refractory castable
Get PriceA new generation of deflocculants and microsilica used to
The effects of six additives i.e. sodium tripolyphosphate (JPP) sodium hexametaphosphate (SHMP) Rheobuild Darvan Glenium and Castament on rheological behavior of microsilica containing ultra
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Development of refractory concrete for extreme conditions
Comparative analysis is provided for the properties of medium-cement refractory concrete with microsilica based on mullite filler in relation to different type of deflocculant. The effect of different deflocculants on refractory concrete structure formation hydration rheology strength and heat resistance is discussed. Corrosion resistance test determined that samples with hybrid
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concrete with microsilica based on mullite filler in relation to different type of deflocculant. The effect of different deflocculants on refractory concrete structure formation hydration rheology strength and heat resistance is discussed. Corrosion resistance test determined that
Get PricePhysical Properties and Chemical Composition of Microsilica
The microsilica generally contain more than 90 silicon dioxide (SiO2). The chemical composition of the silica fumes varies with the type of alloy that is being produced . The acid-soluble chloride content of as-produced and densified silica fume is typically below 0.1 but
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9.1 MICROSILICA IN CONCRETE SYNOPSIS
water demand. This effect has been used to develop a new type of cement based materials which are extremely dense and strong. These new materials are termed DSP referring to "Densified Sy stems containing homogeneously arranged ultra-fine Particles" /10/. The effect of microsilica on the rheology of fresh concrete may
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