Standard blocks

Standard blocks
24 Azar 1349) as the official standard is Iran.
will be.
So to go to Iran should be the last printed and revised standards used.
In preparing this standard is intended to Personnel’s working as much as possible specific requirements of the standard methods and procedures in this country and other countries to create harmony and synchronization.
So all of the facilities and skills available and the present standard necessary experiments were embedded.
Introduction
Hollow concrete blocks or concrete block is a building materials like bricks in a building use and its consumption is increasing gradually. Hollow concrete blocks or concrete to make it that:
A – the use of materials save.
B – transportation and installation of the building is possible by working.
C – due to the relatively high strength and do not need all the space school building will not interfere with the resistance.
D – empty space makes the building less sensitive to heat and cold and heat in other words, is somewhat insulated.
(E) where the provision of good facilities is not possible due to unsuitable soil as well as in areas of high humidity near the sea that is taking blocks the use of brick in the moisture-sensitive Concrete brick, and the results good come prefer.
1 goal
This standard contains specifications and test methods used in the cement block building.
2. Characteristics of Building blocks
Size:
Size hollow concrete blocks should be one of the …
The true size of the nominal size
Width height length width height
Huge 19 30 39 20 30 40
Average 19 20 39 20 20 40
Small 19 10 39 20 10 40
The same measures are appropriate in terms of transportation and handling.
Buyer and seller may agree on concrete blocks with sizes other than listed size to be built.
2.1.2 In the case of hollow concrete block size must comply with the following ratios.
– Total size, empty area of ​​the entire block should be in the same direction, in other words the full size or thickness of the walls of blocks of 2/1 of the total length of the block in the same direction should be less.
– Hollow sections of each block is not more than 50% of its total area.
– Internal and external wall thickness not less than 4 cm in medium and large blocks and small blocks of no less than 3 cm.