Flashcards in Concrete Joints + Accesories Deck (16)
create a weak section,
direct location of cracking,
@ normal temp/stress.
Construction joints should be located @ points of:
@ 2 successive pours (plane of weakness is created)
Construction joints form point where this can occur
Formed by tooling wet/sawcutting/premolded sections in framework.
1/4th slab thickness.
Water leakage @ Construction Joints can be prevented using
waterstops, inserted 1st pour,
extend into 2nd pour.
allow sections move independently,
movement caused by shrinkage or temp changes.
cyclical movement, so must move in two directions.
typ. expansion joint extends through
so no rigid connection between any 2 components of adjacent building sections.
typ. 2 pours separated w premolded joint material.
proprietary products applied protect against water/weather/chemicals/dusting/or to harden.
these type of sealers do not wear as well as some surface sealers do
can use to stop moisture/alkaline migration through existing slab
often used to separate columns from slabs and slabs from foundations.
steel plates cast flush w surface.
attached to steel anchor extending into concrete for positive anchorage.
may be welded to rebar.
Inserts (anchoring devices)
2 types Concrete Sealers
coating or penetrating
this type of sealer dries as surface film, made from acrylics, urethanes, epoxies