Masonry 2 Flashcards
(20 cards)
Describe the focus of Masonry 2.
The focus of Masonry 2 is on the mechanics of masonry under compression and the factors affecting its strength.
Explain how stress distributes in a masonry prism under compression.
Stress is higher in the brick, which is stiff, and lower in the mortar, which is soft, resulting in stress gradients.
Identify what typically fails first in a brick prism under axial load.
The brick typically fails first due to tensile splitting caused by the lateral expansion of mortar.
Define the compressive strength range for North American bricks.
The compressive strength range for North American bricks is from 20 MPa to 100 MPa.
What is the typical strength of mortar used in masonry?
The typical strength of mortar used in masonry is around 10 MPa.
Explain the cause of tensile splitting in brick-mortar prisms.
Tensile splitting in brick-mortar prisms is caused by the lateral expansion of mortar under compression, which puts tensile stress on the bricks.
Describe the significance of A_net being greater than 75% of A_gross in a brick.
If A_net is greater than 75% of A_gross in a brick, A_gross can be used because the cores contribute positively to strength.
Describe how cores improve masonry strength.
Cores allow uniform drying, reduce shrinkage, and enhance bonding.
Explain the comparison of strength between mortar and bricks in a clay prism.
Mortar is significantly weaker than bricks.
Define the unit strength method in masonry.
A method to calculate masonry wall strength based on brick and mortar strengths.
Identify common materials used in concrete block masonry.
Mortar, block, and grout, which often have similar compressive strengths.
How does uniform drying benefit bricks in masonry construction?
It minimizes internal stresses and improves structural integrity.
Discuss the impact of brick type on masonry strength.
The material, manufacturing process, and firing temperature all play a role.
Explain the keying action between mortar and brick and its effect.
It increases load transfer and improves bond strength.
Describe the purpose of prisms in masonry testing.
Prisms are used to simulate real-world composite behavior of masonry walls.
Explain why concrete block prisms exhibit uniform strength distribution.
Concrete block prisms have more uniform strength distribution because mortar, grout, and block often have similar strength properties.
How does the lateral expansion of mortar affect brick integrity?
Lateral expansion of mortar generates tensile stress in the brick, leading to splitting failure.
Identify a structural issue that can arise from using weak mortar in masonry.
Weak mortar may not distribute load properly, leading to early failure.
List the important factors that influence masonry compressive strength.
Important factors affecting masonry compressive strength include unit strength, mortar strength, bond quality, and cross-sectional area.
What impact does firing temperature have on the properties of clay bricks?
Higher firing temperature improves the strength and durability of clay bricks.
