Concrete unit 69-carp 4

Water stop

A ___ is a PVC, rubber or stainless steel barrier used to prevent the passage of liquid or gas under pressure through a joint in a concrete slab or wall

Sealant

A ____ is used to prevent air and water from passing through an expansion joint and into a building

Backer rod

A _____ is first forced into the expansion joint to limit the depth of the sealant

Lift

A layer or concrete is also known as a ___

Extends through the slab

An expansion joint in a concrete slab ___

Cement

Concrete is a mixture of ___, fine or course aggregate, and water

28

Concrete samples used to determine compression strength are cured for ___ days

Tower

Freestanding or climber ____ cranes are used to transport concrete to upper levels in concrete buckets

Water to cement ratio

The compression strength of concrete is largely dependent upon its ___

4' to 6'

The maximum free fall distance of concrete is ___

Cold temperatures

What type of conditions are air entraining admixtures used for?

A straightedge on screed rails

While concrete is being placed, cement finishers strike off the concrete with ____

Air entraining

____ admixtures produce microscopic air bubbles in a concrete mixture