concrete porosity reduction by colloidal silica

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(PDF) 📄 Concrete porosity reduction by colloidal silica ...

Title: Concrete porosity reduction by Colloidal silica nano technology Authors: Pascal COLLET 1a *, A. Brent Rollins 2b , V alery A NDRES 3c 1 TOT AL SA, place Jean

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CONCRETE POROSITY REDUCTION BY COLLOIDAL SILICA NANO ...

CONCRETE POROSITY REDUCTION BY COLLOIDAL SILICA NANO TECHNOLOGY, PART 2: ONE YEAR RESULTS FROM DJENO WHARF* Alex Brent Rollins, Spray-Lock Concrete Protection, Chattanooga, TN . Pascal Collet, PE, Total EP, Paris, France . Valery Andres, SCP France, Limours, France . ABSTRACT . The permeability of portland cement concrete has a direct impact on durability,

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(PDF) CONCRETE POROSITY REDUCTION BY COLLOIDAL SILICA

concrete porosity reduction by colloidal silica nano technology, part 2: one year results from djeno wharf February 2018 Conference: PCI Convention and National Bridge Conference 2018

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[PDF] CONCRETE POROSITY REDUCTION BY COLLOIDAL SILICA

The concrete was treated with colloidal nano-silica as a mitigation measure due to noncompliance with contract documents. The permeability of portland cement concrete has a direct impact on durability, especially in marine and corrosive environments. The petrochemical industry has specific challenges with concrete durability in marine structures and concrete exposed to sulfurous compounds ...

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ResearchGate

Title: Concrete porosity reduction by Colloidal silica nano technology. Authors: Pascal COLLET1a*, A. Brent Rollins2b, Valery ANDRES3c. 1 TOTAL SA, place Jean Millier La Défense 692078 Paris La ...

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researchgate

CONCRETE POROSITY REDUCTION BY COLLOIDAL SILICA NANO TECHNOLOGY, PART 2: ONE YEAR RESULTS FROM DJENO WHARF* Alex . Brent Rollins, Spray-Lock Concrete Protection, Chattanooga, TN. Pascal Collet, PE ...

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Using Colloidal Nano Silica to Enhance the Performance of ...

It was found that using nano-silica enhances the compressive strength, reduces the total porosity and accelerates the pozzolanic reaction. Keywords Colloidal Nano Silica, Nano Silica, Concrete, Mortar, MIP, TGA 1. Introduction The use of supplementary cementitious materials (SCM) reduces the embodied energy in concrete considerably. Furthermore ...

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What is Colloidal Silica? — Colloidal Silica in Concrete ...

Colloidal Silica has also been shown to have an effective impact on the reduction in Alkali-Silica reaction gel polymerization and expansion. The mechanism behind this increase in resistance to deleterious nature of ASR is recognized as a change in the environment needed for the ASR gel to consume constituents to polymerize. Furthermore, by reducing the pore structure, residual bulk water,

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Low-pressure silica injection for porosity reduction in ...

01/03/2017  1. Low-pressure (20 kPa) silica injection has effectively impregnated cement samples. After 14 days of injection with a nano-silica suspension of 20 wt.% concentration we observed a total reduction of 30% in porosity from the starting value, suggesting this is a potential consolidant for friable or cracked concrete. 2.

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Case Studies — Colloidal Silica in Concrete Association

The colloidal silica-treated concrete showed a significant reduction in moisture vapor transmission, which grew more pronounced with time: 18 percent reduction at 28 days; and . 69 percent reduction at 56 days. At 28 days and 56 days, the treated sample showed significant moisture reduction versus the control. ASTM D4263, Standard Test Method for Indicating Moisture in Concrete by the Plastic ...

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Preparation and properties of nanopore-rich cement-based ...

In this work, original silica particles for aerogel preparation were directly used to form nanopore structure in-situ, specifically, colloidal silica sol was used as the pore-forming agent to produce cement-based porous materials, then the rheological behavior of the fresh CPMs, pore structure, pore-forming mechanism, dry density, compressive strength and thermal conductivity of CPMs were ...

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Cement and concrete additives for durability

In high performance concrete, colloidal silica reacts with free lime in the concrete, porosity is significantly reduced, making the concrete more durable and resistant to chemical attack. Colloidal silica works as a finishing aid for freshly laid concrete and is also used for densification of both fresh and old concrete. The construction industry is always on the lookout for ways to improve ...

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Treatment with nano-silica and bacteria to restore the ...

01/07/2021  Moreover, colloidal nano-silica ... Higher amounts were avoided because of the low porosity of concrete. When the concrete pores are saturated, the further precipitation occurs over the surface of the sample (shown in Fig. 1), which was later brushed and removed (4 days after the application) with pressurized air. However, for the bacterially treated samples, a layer of CaCO 3 was

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What Is the Best Concrete Densifier Bisley International LLC

The larger silicate particles of sodium or potassium silicates work better with low-strength concrete with more porosity. Xeolith® LS450 Lithium Silicate . Colloidal Silica Colloidal silica has the smallest particles and reacts better with concrete with admixtures like pozzolan resulting in less free lime. The reaction is also faster than any of the other types. The disadvantage of colloidal ...

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Concentrate and Ready-to-Use Colloidal Silica Concrete ...

A reactive colloidal silica finishing aid that provides a multitude of immediate and long-term benefits to freshly placed concrete. Concrete surfaces treated with TK-SLAB ASSIST are lubricated for faster and easier finishing and prolonged workability, even when conditions are unfavorable. With 100% reactive technology, TK-SLAB ASSIST yields concrete slabs with higher density, improved ...

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Using Colloidal Nano Silica to Enhance the Performance of ...

It was found that using nano-silica enhances the compressive strength, reduces the total porosity and accelerates the pozzolanic reaction. Keywords Colloidal Nano Silica, Nano Silica, Concrete, Mortar, MIP, TGA 1. Introduction The use of supplementary cementitious materials (SCM) reduces the embodied energy in concrete considerably. Furthermore ...

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What is Colloidal Silica? — Colloidal Silica in Concrete ...

Colloidal Silica has also been shown to have an effective impact on the reduction in Alkali-Silica reaction gel polymerization and expansion. The mechanism behind this increase in resistance to deleterious nature of ASR is recognized as a change in the environment needed for the ASR gel to consume constituents to polymerize. Furthermore, by reducing the pore structure, residual bulk water,

Get price

Effect of Colloidal Nano-Silica on the Mechanical and ...

Effect of Colloidal Nano-Silica on the Mechanical and Durability Performances of Mortar ... The improved durability could be explained by the reduction and refinement in the porosity, which can be attributed to nanofiller effect and pozzolanic reaction of nanosilica. Furthermore, the addition of CNS could reduce the drying shrinkage by densifying the microstructure in the cement paste, which ...

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Case Studies — Colloidal Silica in Concrete Association

The colloidal silica-treated concrete showed a significant reduction in moisture vapor transmission, which grew more pronounced with time: 18 percent reduction at 28 days; and . 69 percent reduction at 56 days. At 28 days and 56 days, the treated sample showed significant moisture reduction versus the control. ASTM D4263, Standard Test Method for Indicating Moisture in Concrete by the Plastic ...

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Colloidal Silica: Cement Enhancing Admixture Product ...

CS in NDOT concrete mix designs. Conclusion Colloidal silica shows promise in its SiO 2 ability to mitigate against ASR when used as a replacement of F-ash at both 2% and 3% levels. The 3% replacement of F-ash -ash blended cement showed the greatest reduction in C1567 expansion. This indicates that CS is a viable option for replacing F-ash to

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Reduction of the calcium leaching rate of cement paste by ...

01/08/2008  The reason of the preservation of such unreacted cement lies partly on the porosity, see Fig. 3, as the three samples with colloidal silica have a lower porosity than the others at t 0, making it more difficult for the aggressive solution to get into them. However, this does not account for the different evolution of the sample CS1 compared to the CS2 and CS3, what should be further studied ...

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Influence of incorporation of nano-silica and recycled ...

30/11/2014  For the casting of concrete specimens, initially, Colloidal NS was mixed with water and stirred properly so that uniform dispersion of silica nano-particles could be achieved. After that, the cement, sand and coarse aggregates were mixed at a low speed for 2 min in a concrete rotary mixture. After mixing for 2 min, the mixture of NS and water was slowly poured and stirred at a low speed for ...

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Treatment with nano-silica and bacteria to restore the ...

01/07/2021  Moreover, colloidal nano-silica ... Higher amounts were avoided because of the low porosity of concrete. When the concrete pores are saturated, the further precipitation occurs over the surface of the sample (shown in Fig. 1), which was later brushed and removed (4 days after the application) with pressurized air. However, for the bacterially treated samples, a layer of CaCO 3 was

Get price

WO2015108990A1 - Addition of colloidal silica to concrete ...

A method of blending concrete is provided wherein there is a determination of a standard volume of water to add to a dry concrete mix to provide hydrated concrete with a desired slump value, and then calculating a substitution volume of an aqueous composition including colloidal silica to be used in place of an eliminated portion of the standard volume of the water, and mixing the substitution ...

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Concentrate and Ready-to-Use Colloidal Silica Concrete ...

A reactive colloidal silica finishing aid that provides a multitude of immediate and long-term benefits to freshly placed concrete. Concrete surfaces treated with TK-SLAB ASSIST are lubricated for faster and easier finishing and prolonged workability, even when conditions are unfavorable. With 100% reactive technology, TK-SLAB ASSIST yields concrete slabs with higher density, improved ...

Get price
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