SEGMENTAL RING SELF-READING STAFF

SEGMENTAL RING Voussoir

Construction

A precast piece of cast iron or concrete used as provisional or final lining on the vault of a tunnel. See Figures 23 and 23a

Figure 23

SEGMENTAL RING

Figure 23a
A 2-to-4-m long cast-steel piece, part of a metal arch and which shows an I-section whose web is strengthened by stiffeners. The segmental rings are assembled together by means of bolts. (Generally these segments are covered in edge by decorative cast-iron parts.) Syn. with CASTSTEEL SEGMENT. See Figure 23b

SEGMENTAL RING

Figure 23b

SEGREGABLE S gr gabilit

Geology and Building Materials

A character of selective dissociation affecting some matter made up of elements of different densities; it is the case of concrete, for example.

SEGREGATED S gr g

Building Materials

Of a material having undergone a segregation.

SEGREGATED CONCRETE B ton s gr g

Defects (Building Materials)

Any concrete presenting honeycombings following a segregation.

SEGREGATION S gr gation

Metallurgy; Building Materials

An imbalance in the chemical composition of the different components of an alloy.
A preferential aggregation of the chemically alike components between them during the solidification phase of an alloy; this separation results in a chemically heterogeneous structure.
A selective dissociation, in distinct heaps, of different previously mixed bodies as a result of vibration, brewing, etc.
A phenomenon of dissociation of the concrete ingredients that can be due to various causes (excessive vibration, carriage, falls from critical height, etc.). Elements are divided and rearranged by order of density. The heaviest aggregates go down to the bottom while conversely,...

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Dictionary of Civil Engineering: English-French