Free Lime
Free Lime - Related Videos
08:10
Fizzy Extraction of Volatile Organic Compounds Combined with Atmospheric Pressure Chemical Ionization Quadrupole Mass Spectrometry
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Cited by 16 •
2017
Fizzy extraction is a new laboratory technique for analysis of volatile and semivolatile compounds. A carrier gas is dissolved in the liquid sample by applying overpressure and stirring the sample. The sample chamber is then decompressed. The analyte species are liberated to the gas phase due to effervescence.
17:31
Operant Learning of Drosophila at the Torque Meter
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Cited by 26 •
2008
Measuring the yaw torque of tethered Drosophila with the torque meter allows the neuroscientist exquisite control of the stimulus situation of the experimental animal. Together with the unique genetic tools available in the fruit fly, this paradigm is used for a wide variety of neurobiological research.
14:22
Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Cited by 9 •
2013
Radical-based biomimetic chemistry has been applied to building-up libraries necessary for biomarker development.
04:31
Measurement of Metabolic Rate in Drosophila using Respirometry
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Cited by 49 •
2014
Metabolic disorders are among one of the most common diseases in humans. The genetically tractable model organism D. melanogaster can be used to identify novel genes that regulate metabolism. This paper describes a relatively simple method which allows studying the metabolic rate in flies by measuring their CO2 production.
07:12
Measuring O2 Consumption in Drosophila melanogaster Using Coulometric Microrespirometry
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Cited by 1 •
2023
Coulometric respirometry is ideal for measuring the metabolic rate of small organisms. When adapted for Drosophila melanogaster in the present study, measured O2 consumption was within the range reported for wildtype D. melanogaster by previous studies. Per-fly O2 consumption by CASK mutants, which are smaller and less active, was significantly lower than the wildtype.
FAQs
Water can hydrate free lime slowly, converting calcium oxide into calcium hydroxide while releasing heat. If this reaction occurs after the surrounding binder has hardened, the newly formed material can occupy more volume than the original phase. The resulting delayed expansion may generate internal stress, which can appear as cracking or dimensional instability in cementitious products.
The timing of hydration is central to its engineering effect. Early reaction may occur while the binder can accommodate some volume change, but slow hydration after hardening restricts that movement. This creates a greater risk of delayed expansion and cracking. Measuring free lime therefore helps engineers evaluate whether a material is likely to maintain stable dimensions.
Free lime must be considered as a balance rather than an automatically harmful constituent. Controlled amounts can contribute to binder reactivity and strength development, while excessive levels may promote delayed expansion, cracking, or reduced durability. Its measured concentration helps relate chemical composition to the expected performance of clinker, cement, or other lime-based binders.
The measured amount provides an indicator for evaluating clinker burning and the resulting cement quality. Because uncombined calcium oxide can affect later hydration and dimensional stability, its presence connects manufacturing conditions with performance after water is added. Engineers use this relationship to identify material conditions that may require closer quality assessment before application.
Testing indicates whether a cementitious material contains a level of uncombined calcium oxide that could contribute to later volume change. The result supports assessment of dimensional stability rather than serving only as a compositional measurement. Engineers can use it when judging the likelihood of delayed expansion, cracking, and related durability concerns in cement-based products.
Engineers should consider free lime during material qualification and when evaluating cement, clinker, lime-based binders, or other industrial materials intended for cementitious products. The measurement is especially relevant where dimensional stability and durability matter, because excessive free lime may cause delayed expansion and cracking after hardening, potentially affecting the reliability of structural applications.
Free lime analysis supports process control by linking the composition of clinker or binder materials with hydration behavior and later dimensional change. It also contributes to material qualification, allowing engineers to assess cement quality and suitability before use. These evaluations help support safer applications by identifying excessive levels associated with expansion, cracking, or durability loss.