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Related Concept Videos

Curing of Concrete01:20

Curing of Concrete

415
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
415
Setting Time of Cement01:12

Setting Time of Cement

789
The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
789
Soundness of Cement01:17

Soundness of Cement

622
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
622
Curing Methods01:26

Curing Methods

348
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
348
Porosity in Cement Paste01:18

Porosity in Cement Paste

509
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
509
Types of Cement I01:21

Types of Cement I

432
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
432

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Does Tack Curing Luting Cements Affect the Final Cure?

Daniel Stegall, Daranee Tantbirojn, Jorge Perdigão

    The Journal of Adhesive Dentistry
    |June 6, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Tack curing luting cements minimally impacts final hardness, with slight increases observed in dual-curing and light-curing types. Self-curing cements showed no effect from tack curing, indicating its limited influence on overall material properties.

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    Area of Science:

    • Dental Materials Science
    • Polymer Chemistry
    • Biomaterials Engineering

    Background:

    • Tack curing, a short initial light exposure, aids in excess luting cement cleanup by creating a semi-gel state.
    • Understanding the impact of tack curing on the final degree of cure is crucial for ensuring the longevity and performance of dental restorations.

    Purpose of the Study:

    • To evaluate the effect of tack curing on the final hardness of various luting cements.
    • To compare the influence of tack curing across different luting cement chemistries: dual-curing composite, light-curing veneer, and resin-modified glass-ionomer (RMGI).

    Main Methods:

    • Three cement types were tested: dual-curing composite, light-curing veneer, and RMGI luting cements.
    • Samples underwent tack curing (2-5s) followed by manufacturer-recommended final curing.
    • Vickers hardness was measured at 0.5mm increments after 24h storage at 37°C and 100% humidity.

    Main Results:

    • Hardness significantly decreased with depth in dual-curing and light-curing cements.
    • Tack curing generally increased hardness at depth for these types, with minor exceptions near the surface.
    • Self-curing RMGI cements exhibited no depth-dependent hardness reduction and were unaffected by tack curing.

    Conclusions:

    • Tack curing has a minimal, often slightly positive, effect on the depth of cure for dual-curing and light-curing luting cements.
    • The impact of tack curing on luting cement hardness is generally insignificant, with potential minor surface hardness reduction in some light-curing veneer cements.
    • Self-curing cements are not influenced by tack curing in terms of their final hardness profile.