Construct · 2 fields · 2 citations

Where does retardation collide?

One name. Different field. Different construct. One map.

● jingle · one word, two constructs Nearest construct by meaning·not indexed
retardation2 CONSTRUCTSSet retardationPANG · SET DELAYOptical retardationHECHT · PHASE DELAY

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2014Set retardation2017Optical retardation
2026

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Cement chemistry

Chemically delaying concrete set

In cement chemistry, retardation is the deliberate or incidental slowing of the hydration reactions that make cement set, achieved with chemical retarder admixtures such as sugars or phosphonates that delay the stiffening of fresh concrete. It buys working time for placing and finishing, especially in hot weather or on long hauls. Pang, Boontheung, and Boul's 2014 study in Cement and Concrete Research treats retarder behaviour as a trigger controlling the onset of Portland cement hydration. The referent is the chemically delayed set of a cementitious material, unrelated to chilled dough beyond the shared idea of slowing down.[1]

Unit
The delay in setting time imparted to fresh cement paste or concrete
Recovery means
Hydration and setting proceed once the retarder's effect is overcome
Measured by
Quantified by set-time tests and by calorimetry of the delayed hydration reaction

Optics

Phase delay between polarization components

In optics, retardation (retardance) is the phase difference a birefringent material introduces between two perpendicular polarisation components of light as they travel through it at different speeds; a wave plate is specified by the retardation it produces, such as a quarter-wave or half-wave. It is the working principle behind wave plates and polarisation control. Hecht's Optics (2017) presents retardation and retarders within its treatment of polarisation. The referent is an optical phase delay measured in wavelengths or radians, sharing only the word with chilled dough or delayed concrete.[2]

Unit
The phase delay between polarisation components, in wavelengths or radians
Recovery means
Not applicable
Measured by
Measured with polarimeters and compensators as the induced phase difference versus wavelength

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Nearby collisions

ballistic coefficient1 fields · 1 citationsanchor · standalone constructbirefringence3 fields · 3 citationsinvariant · one construct, three systems

References

  1. Pang, X., Boontheung, P., & Boul, P. J. (2014). Dynamic retarder exchange as a trigger for Portland cement hydration. Cement and Concrete Research, 63, 20–28. https://doi.org/10.1016/j.cemconres.2014.04.007
  2. Hecht, E. (2017). Optics (5th ed.). Pearson. ISBN 9780133977226

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