Masonry Flashcards
1
Q
basic ingredients of modern mortar
A
- cements
- lime
- sands
2
Q
minimum mortar strength
A
12.5 MPa (28 day strength)
3
Q
grout
A
- expanding grout forces out excess water and air
- fills voids in a wall and bonds reinforcement to masonry
- high slump concrete with fine aggregates
4
Q
minimum grout strength
A
17.5 MPa (28 day strength)
5
Q
Best grout method
A
High Lift grouting with expansive admixture
- max pour height = 3.6m
- expanding grout forces out excess water and air
6
Q
Masonry Unit
A
- specialised application of reinforced concrete
- uses masonry a permanent formwork
- reinforcing fitted within open cells
- reinforcing requirements follow those of reinforced concrete
7
Q
masonry unit design strength
A
12 MPa
8
Q
3 functions of structural walls
A
- resist vertical compression
- resist bending from eccentric vertical loads and/or transverse loads (wind, earthquake)
- resist in-plane shear and bending from lateral loads applied to building system in direction parallel with plane of wall
9
Q
minimum clay unit strength
A
brick strength 100MPa
10
Q
Failure of Clay Brick Wall under Vertical Load
A
- Poissons Ratio for mortar Vmortar>Vunit
- causing tension in brick, compression in mortar
- even applying compressive load brick fails from tensile forces because of martar
11
Q
Clay Unit
A
- 100MPa brick strength
- Vmortar > Vunit
12
Q
Concrete Block Prisms
A
- grout poured into concrete blocks
- expansive admixtures - good bonding between reinforcing, concrete framework and grout
- mortar strength = block strength = grout strength (ish)
