Porogenic Behavior of Water in High-Alumina Castable
This effect occurs because drying preserves part of the interparticle pores originally occupied by water. The fraction of pores obtained in these cases can reach levels higher than 50 affecting the properties of the structure. M. M. Akiyoshi and V. C. Pandolfelli "Effect of curing time on the properties of CAC bonded refractory
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SteelEffects of heat-treating Britannica
SteelSteelEffects of heat-treating Adjusting the carbon content is the simplest way to change the mechanical properties of steel. Additional changes are made possible by heat-treating—for instance by accelerating the rate of cooling through the austenite-to-ferrite transformation point shown by the P-S-K line in the figure. (This transformation is also called the Ar1 transformation
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL SILICA
curing time the samples were allowed to be dried at the temperature of 110°C and then fired at 1000°C 1200°C and 1400°C for 3 hours. The cold strength (CCS CMOR) was measured according to the ASTM C109. Permanent linear changes (PLC) of the samples fired at
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Orthogonal Test Research on the Effect of Curing
The effect of curing pressure curing temperature and curing time on the mechanical properties of the adhesively bonded composite structure of CFRP and Al are studied by means of the Orthogonal Test. Indexed by the fatigue life of the composite structure of CFRP and Al in room temperature environment and by making the direct variance and effect analysis for the test data we have obtained the
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Effect of curing time on the hydration and material
May 23 2020 · Artificial aggregates such as fly ash lightweight aggregates can be used as eco-friendly alternatives to natural aggregates. This work aims to investigate the effect of curing time on the hydration and material properties (voids shrinkage crushing strength and pH) of cold-bonded high-calcium fly ash–Portland cement lightweight aggregate. Fly ash was used as a lightweight material (at
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Effect of Additives and Installation Temperatures on
Dec 01 2016 · Three different mixing and curing tempera-tures 5 20 and 35 °C respectively were ap-plied for both microsilica-gel and silica-sol bonded NCCs in order to understand the effect of installation temperatures on set-behaviour and mechanical properties. An ultrasonic recorder has become an ef-ficient tool to follow the set and hardening
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Effect of Additives and Installation Temperatures on
Dec 01 2016 · Three different mixing and curing tempera-tures 5 20 and 35 °C respectively were ap-plied for both microsilica-gel and silica-sol bonded NCCs in order to understand the effect of installation temperatures on set-behaviour and mechanical properties. An ultrasonic recorder has become an ef-ficient tool to follow the set and hardening
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Mechanical property and phase evolution of the hydrates of
Jan 10 2021 · Fig. 1 presents the CMOR and CCS of the CAC-bonded alumina castables after curing at 30 °C for 24 h and subsequently drying at 110 °C for different periods of time. It can be seen that the demoulding strength of castables is pretty low with CMOR of 0.39 MPa and CCS of 4.06 MPa.
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Effect of curing time on the volume stability of corundum
Oct 15 2020 · This work discusses the relationship between curing time and volumetric stability of CAC-bonded castables. The PLC of the castables fired at 1600 °C decrease from 0.21 to 0.11 with the increase of curing time from 0.5 days to 6 days.
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Urea-formaldehydeWikipedia
Urea-formaldehyde (UF) also known as urea-methanal so named for its common synthesis pathway and overall structure is a nontransparent thermosetting resin or polymer is produced from urea and formaldehyde.These resins are used in adhesives finishes particle board medium-density fibreboard (MDF) and molded objects.. UF and related amino resins are a class of thermosetting resins of
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(PDF) Citric Acid as Anti-Hydration Additive for Magnesia
Effect of curing time on the properties of CAC bonded refractory. Previous work by the authors has shown that the effects of calcium aluminate cement (CAC) and hydratable alumina (HA) can
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Ashort review is presented of prospects for using nanomaterials in various refractory technologies and an estimate is given of existing and future directions of their use for improving the operating properties of refractories. The possibility of controlling material properties at the atomic level makes it possible to create new innovative refractory materials and technology.
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CalciumAluminateCementConcrete(ClassCACConcrete
The high early strength of CAC is largely attributed to the accelerator used. Most of the accelerators commonly used are lithium based and the dosage is not typically in the range of those used for OPC. The dosage is also dependent on the ambient temperature. In addition certain high range water reducers tend to extend the working time of CAC
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Failure Mechanism and Mechanical Properties of a Retard
The tensile period of the retard-bonded agent used for the girder experiment is 8 months and the curing period is 2 years. To assess the influence of stretching period of prestressed tendons on the mechanical properties of the structure the prestressed tendons were stretched according to the dates shown in Table 1 (on 2017.7.18 2017.10.25 and 2017.12.15).
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Effects of self-curing activator and curing protocol on
Effects of self-curing activator and curing protocol on the bond strength of composite core buildups. Rathke A(1) Balz U Muche R Haller B. Author information (1)Department of Operative Dentistry and Periodontology University of Ulm Germany. andreas.rathke uniklinik-ulm
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Porogenic Behavior of Water in High-Alumina Castable
This effect occurs because drying preserves part of the interparticle pores originally occupied by water. The fraction of pores obtained in these cases can reach levels higher than 50 affecting the properties of the structure. M. M. Akiyoshi and V. C. Pandolfelli "Effect of curing time on the properties of CAC bonded refractory
Get Price
Effects of Cusp Inclination and Light-curing Time on
Purpose To evaluate the effect of cusp inclination and light-curing time on the microshear bond strength (μSBS) between zirconia and a dual-cure self-adhesive composite cement and zirconia. Materials and methods Forty U-shaped specimens with angled surfaces simulating different cusp inclinations (0 degrees 20 degrees and 30 degrees) were fabricated from zirconia blocks (Zenostar
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL SILICA
curing time the samples were allowed to be dried at the temperature of 110°C and then fired at 1000°C 1200°C and 1400°C for 3 hours. The cold strength (CCS CMOR) was measured according to the ASTM C109. Permanent linear changes (PLC) of the samples fired at
Get Price
The Bonding of Optical Elements Techniques and Trouble
Manual for using structural adhesives andoptical cements for the bonding of optical elements. Covers preparation ofthe substrate cement optical elements and adhesives cementing technique uv curing applications and bond failure causes and remedies. From SummersOptical.Technical help with the bonding of optical elements includes descriptions of bond failures in optical adhesivesand cements
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DEVELOPMENT OF A TESTING APPROACH FOR TACK COAT
partially bonded tensile strains will develop at the bottom of the overlay and shear strains promoting rutting will develop in the upper portion of the overlay as shown by Carpenter and Freeman (1986).
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Effect of Bulk-filling on the Bonding Efficacy in Occlusal
Purpose To evaluate the effect of bulk filling Class I posterior cavities on bonding to cavity-bottom dentin. Materials and methods Two flowable "base" bulk-fill composites (Filtek Bulk Fill Flowable SDR) one paste-like "full-body" bulk-fill composite (Tetric EvoCeram Bulk Fill) and one conventional paste-like composite (Filtek Z100) were bonded (G-ænial Bond) to either a flat surface (3
Get PriceEffect of carbon dioxide-air concentration in the rapid
This study deals with the effects of carbon dioxide (CO2)-air concentration in the rapid curing method on the properties of cement-bonded particleboard manufactured using conventional cold pressing as the setting method. The hydration of cement was examined using X-ray diffractometry thermal gravimetry and scanning electron microscopy. The results are as follows (1) The properties of CO2
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(PDF) Citric Acid as Anti-Hydration Additive for Magnesia
Effect of curing time on the properties of CAC bonded refractory. Previous work by the authors has shown that the effects of calcium aluminate cement (CAC) and hydratable alumina (HA) can
Get Price
Contact Corresponding Author Effect of curing time on
Artificial aggregates such as fly ash lightweight aggregates can be used as eco-friendly alternatives to natural aggregates. This work aims to investigate the effect of curing time on the hydration and material properties (voids shrinkage crushing strength and pH) of cold-bonded high-calcium fly ash–Portland cement lightweight aggregate. Fly ash was used as a lightweight material (at 90
Get Price
CalciumAluminateCementConcrete(ClassCACConcrete
The high early strength of CAC is largely attributed to the accelerator used. Most of the accelerators commonly used are lithium based and the dosage is not typically in the range of those used for OPC. The dosage is also dependent on the ambient temperature. In addition certain high range water reducers tend to extend the working time of CAC
Get Price
The Effect of Different Bonding Agent Curing Times on
The type of light curing device did not have any significant effect on dentin margin microleakage (p>0.05). Further-tions irradiated with different curing times (p>0.05). Conclusion QTH and LED curing units in 20 30 and 40s curing time did not have any significant effect on microleakage of class V composite restoration margins.
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