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Flashcards in Concrete Joints + Accesories Deck (16)
0

create a weak section,
direct location of cracking,
@ normal temp/stress.

Control Joint

1

Construction joints should be located @ points of:

min. shear

2

@ 2 successive pours (plane of weakness is created)

Construction joints:

3

Construction joints form point where this can occur

water leakage

4

Formed by tooling wet/sawcutting/premolded sections in framework.
1/4th slab thickness.

Control Joint

5

Water leakage @ Construction Joints can be prevented using

waterstops, inserted 1st pour,
extend into 2nd pour.

6

allow sections move independently,
movement caused by shrinkage or temp changes.
cyclical movement, so must move in two directions.

Expansion joints

7

typ. expansion joint extends through

entire structure,
so no rigid connection between any 2 components of adjacent building sections.

8

typ. 2 pours separated w premolded joint material.

Isolation joints

9

proprietary products applied protect against water/weather/chemicals/dusting/or to harden.

Concrete Sealers

10

these type of sealers do not wear as well as some surface sealers do
can use to stop moisture/alkaline migration through existing slab

penetrating sealer

11

often used to separate columns from slabs and slabs from foundations.

Isolation joints

12

steel plates cast flush w surface.
attached to steel anchor extending into concrete for positive anchorage.
may be welded to rebar.

weld plates

Inserts (anchoring devices)

13

2 types Concrete Sealers

coating or penetrating

14

this type of sealer dries as surface film, made from acrylics, urethanes, epoxies

coating sealer

15

this type of sealer seeps into tiny pores
made of silicone, silanes, siloxanes

penetrating sealer