Astm C 90 Specifications

The ASTM C90 specification is the most widely used standard for measuring the strength of steel. It was originally developed in 1990 and has been updated several times since then. The latest version, published in 2015, includes a new section on carbon content which is often referred to as “Carbon Max.”

The astm c 90 pdf is a specification that was created by ASTM International. The document outlines the requirements for materials and test methods used in construction, civil engineering, and mechanical engineering.

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Hi, my name is _______ and I write about the latest ASTM C90 specifications. I hope you’ll find this blog helpful in understanding the compressive strength requirements for solid and hollow masonry units, as well as other related topics.

Introduction

Masonry is one of the oldest and most versatile building materials in the world. Modern masonry construction can be traced back to the early Egyptians, who used mud bricks to build their pyramids and temples. Today, masonry is still widely used in a variety of applications, from residential homes to commercial buildings.

There are two main types of masonry units: solid and hollow. Solid masonry units are made of a single piece of material, such as brick or stone. Hollow masonry units are made of two pieces of material that are joined together, such as cinder blocks or concrete pipe.

The American Society for Testing and Materials (ASTM) has published a number of standards that apply to masonry construction. These standards cover everything from the manufacturing of masonry units to the installation of masonry walls.

ASTM C90 Standard Specification for Loadbearing Concrete Masonry Units

This standard covers the manufacture and testing of loadbearing concrete masonry units (CMUs). It includes requirements for compressive strength, absorption, dimensions, warpage, and more.

ASTM C129 Standard Specification for Nonloadbearing Concrete Masonry Units

This standard covers the manufacture and testing of nonloadbearing CMUs. It includes requirements for compressive strength, absorption, dimensions, warpage, and more.

ASTM C-90 Compressive Strength Requirements

This standard sets forth minimum compressive strength requirements for loadbearing CMUs used in structural applications. The compressive strength must be determined using an approved test method specified in the standard.”

What is ASTM C90?

ASTM C90 is a standard specification for load-bearing, solid masonry units. These units are made from fired clay or shale and are used to construct walls, columns, and other load-bearing structures. The specification covers the physical and performance requirements for these units, as well as the methods of manufacture and testing.

The Different Types of Masonry Units

There are many types of masonry units available on the market today. The most common type is the ASTM C90 concrete block. These blocks are made from a mixture of Portland cement, aggregate (usually sand and gravel), water, and other ingredients. The resulting blocks are strong and durable, making them ideal for use in construction projects.

Other types of masonry units include brick, stone, and glass block. Brick is one of the oldest types of masonry units and is still popular today. It is made from fired clay or shale and is typically red or yellow in color. Stone masonry units are made from natural stone such as granite or limestone. Glass block is a newer type of masonry unit that is made from glass that has been formed into blocks.

Compressive Strength Requirements

In order to ensure that masonry units are strong enough to withstand the loads they will be subjected to during their lifetime, the American Society for Testing and Materials (ASTM) has established a series of compressive strength requirements. These requirements are set forth in ASTM C90, Standard Specification for Loadbearing Concrete Masonry Units.

There are two different types of masonry units covered by ASTM C90: solid and hollow. Solid masonry units are made entirely of solid material, while hollow units have voids or cavities within them. The compressive strength requirements for these two types of units differ slightly.

Solid masonry units must have a minimum compressive strength of 2,000 pounds per square inch (psi). This means that when such a unit is subject to a force equal to its own weight, it can withstand that force without crumbling or breaking.

Hollow masonry units must have a minimum compressive strength of 1,800 psi. This is because the voids within the unit act as weak points that can cause the unit to fail under load if they are not properly filled with mortar or grout.

In order to meet these compressive strength requirements, masonry units must be made from high-quality materials and manufactured according to strict standards. In addition, they must be properly installed using sound construction practices.

Water Absorption Requirements

ASTM C90 requires that all solid masonry units have a maximum water absorption of 5%. This means that no more than 5% by weight of the unit can be absorbed by water. For hollow units, the requirements are slightly different. The maximum water absorption for hollow units is 10%, provided that thevoid space within the unit is not greater than 20%.

Compressive Strength Requirements:

According to ASTM C90, the minimum compressive strength requirement for solid masonry units is 2,000 pounds per square inch (psi). For hollow units, the compressive strength must be 1,500 psi. However, if the void space within the unit is greater than 20%, then the compressive strength requirement increases to 2,000 psi.

Definitions:

Solid Masonry Units: A solid masonry unit is defined as a unit that is made entirely of solid material with no voids or cavities.

Hollow Masonry Units: A hollow masonry unit is defined as a unit that contains one or more voids or cavities. These voids may be either internal (within the body of the unit) or external (on the surface of the unit).

Dimensional Tolerances

In order to ensure that masonry units are of the correct size and shape, ASTM C90 establishes dimensional tolerances for solid and hollow units. These tolerances are necessary to control the variation in masonry unit dimensions from batch to batch, and from manufacturer to manufacturer.

Solid Masonry Units:

ASTM C90 defines a solid masonry unit as “a brick whose net cross-sectional area (excluding pore space) is 75 percent or more of its gross cross-sectional area.” In other words, a solid masonry unit is one that is mostly solid, with only a small amount of pore space.

The dimensional tolerances for solid masonry units are as follows:

ufffd Length: ufffd 1/8 inch (3.2 mm)

ufffd Width: ufffd 1/8 inch (3.2 mm)

ufffd Thickness: ufffd 1/16 inch (1.6 mm)

ufffd Diagonal: ufffd 1/4 inch (6.4 mm)

Hollow Masonry Units:

ASTM C90 defines a hollow unit as “a brick whose net cross-sectional area (excluding pore space) is less than 75 percent of its gross cross-sectional area.” In other words, a hollow unit contains a significant amount of pore space. The most common type of hollow unit is the cinder block, which has large holes running through it. Other types of hollow units include perforated bricks and cellular bricks.

The dimensional tolerances for hollow masonry units are as follows: Length: ufffd 3/16 inch (4.8 mm), Width: ufffd 3/16 inch (4.8 mm), Thickness: ufffd 3/32 inch(2.4mm), Diagonal :ufffd 1/2inch(12mm).

Sampling and Testing

In order to determine the compressive strength of masonry units, samples must be taken and tested in accordance with ASTM C90. This standard provides guidance on sampling methods, specimen preparation, and testing procedures.

ASTM C90 defines two types of masonry units: solid and hollow. Solid masonry units are made entirely of mortar or concrete, while hollow units have voids that account for at least 25% of their volume.

To take a representative sample of masonry units, at least 50 units should be selected from each production lot. The sample size may need to be increased if the unit type is not homogeneous (e.g., if there are multiple colors or textures within a single production lot).

Once the sample has been collected, specimens must be prepared for testing in accordance with ASTM C129. This standard specifies the dimensions and tolerances for test specimens, as well as the method for preparing them.

Finally, the specimens can be subjected to compressive strength testing in accordance with ASTM C-90. This standard provides requirements for testing equipment and procedures, as well as minimum compressive strength requirements for different types of masonry units.

By following these standards, engineers can ensure that they are accurately assessing the quality of masonry materials before using them in construction projects.

Conclusion

The above mentioned keywords relate to the ASTM C90 standard for brick masonry. This standard covers the manufacture, testing and quality requirements for solid and hollow masonry units made from clay or shale. The compressive strength requirements specified in this standard are necessary to ensure that the brick masonry is able to withstand the loads it will be subject to during its lifetime.

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