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Jacking Force

(Concrete Engineering) The temporary force exerted by the jacking device which introduces tension into the tendons. Jacking Stress In prestress concrete, the maximum stress occurring in a tendon during stressing.

Bleeding, Bleed Water

(Concrete Engineering) A form of segregation in which some of the water in a mix tends to rise to the surface of freshly placed concrete. Known also as water gain.

HRM High Reactivity Metakaolin

(Concrete Engineering) Refined form of an ASTM C618, Class N (natural) pozzolan. A high performance, mineral admixture, similar in performance to silica fume, additionally comparable in cost. Pure white powdered in form will, not effect the natural color or darken concrete as silica fume does. Suitable for high-performance color matching in architectural concrete. Dosage at 5% to 10%, of cement by weight. No bleed water, better finishability, more creamy, cleanup is easier with slightly higher 28 day strengths and 25% - 35% less plasticizer is required than silica fume.

User hierarchy

(Software Engineering) a hierarchical representation of the categories of users that will interact with any type of software

Broaching 2

(english) Multiple shaving, accomplished by pushing a tool with stepped cutting edges along the piece, particularly through holes.

Activation

(english) The changing of the passive surface of a metal to a chemically active state. Contrast with passivation.

Billet

(english) (1) A semi-finished section hot rolled from a metal ingot, with a rectangular cross section usually ranging from 16 to 36 in., the width being less than twice the thickness. Where the cross section exceeds 36 in., the term “bloom” is properly but not universally used. Sizes smaller than 16 in. are usually termed “bars”; a solid semi-finished round or square product which has been hot worked by forging, rolling, or extrusion. (2) A semi-finished, cogged, hot rolled or continuous-cast metal product of uniform section, usually rectangular with radiused corners. Billets are relatively larger than bars.

By Coil

(english) Selling term which refers to product sold in the form of a coil vs. cut plate. "Bi Coil" is also used in production to refer to coils vs. cut plate

Bifluoride Feeder

(english) A machine in the Tin Mill that automatically puts bifluoride into the plater bath.

Bar, Flask

(english) A rib in the cope of a tight flask to help support the sand.

Back-up Balance

(english) Cylinders that supply the force used to hold the back-up rolls up in place.

Thermocline

(Environmental Engineering) The depth at which an inflection point occurs in a lake temperature profile.

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