22 first-level construction engineer construction gold test point block types and strength levels, notes from the first construction master, long press to like + forward + comment for continuous updates, click on my avatar in the Wendang version and send me a private message: 2022
block is A general term for various bricks, stones, and small blocks used in masonry. Classification of
1. fired brick ?
sintered bricks include sintered ordinary bricks (solid bricks), sintered porous bricks and sintered hollow bricks.
(1) Sintered ordinary bricks: 240×115×53
(2) Sintered porous bricks: The holes are perpendicular to the pressure surface during masonry.
(3) Sintered hollow bricks: when laying the holes horizontally
2. block ?
(1) Ordinary concrete small hollow block
(2) Lightweight aggregate concrete Small hollow block
What are the types and strength levels of mortar?
mortar is composed of ingredients and is usually divided into cement mortar , mixed mortar and special mortar.
cement mortar: high strength, good durability; slightly poor fluidity and water retention. Used below the moisture-proof layer or in masonry with high strength requirements.
cement mixed mortar: cement lime mortar is the most widely used. It has certain strength and durability; good fluidity and water retention. The commonly used mortar
for general walls is evaluated by measuring the compressive strength value of a set of three pieces of cube specimens with a side length of 7.07cm after 28 days of standard curing (20±2℃, relative humidity above 90%).
determines the intensity level.
[Dream Interpretation by Zhou Gong] 95% concrete, 90% mortar, the rest are the same
(1) Normal situation: the arithmetic mean of the three strength (accurate to 0.1)
(2) Only one of the maximum or minimum values differs from the middle value If it exceeds 15%, then directly take the middle value as the compressive strength value of the group of test blocks, for example: 9MPa, 10MPa, 12MPa, take 10MPa
(3) If the differences between the maximum and minimum values and the middle value all exceed 15%, then the group The test piece is invalid, such as 8MPa, 10MPa, 12MPa invalid
