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Self consolidating concrete icf

Self consolidating concrete icf

Are plaster, stucco, and EIFS the same? While there are several parts of the North America where stucco always has a strong presence, there appears to be a general renewed interest in portland cement plaster for building finishes everywhere. The answer requires a thorough explanation. Plaster is the general term for material that is applied to a wall surface in a thin layer. Portland cement-based plaster is such a material that uses portland cement as the binder.

Portland cement plaster is applied either by hand or machine to exterior and interior wall surfaces in two or three coats. It may be applied directly to a solid base such as masonry or concrete walls, or it can be applied to metal lath attached to frame construction, solid masonry, or concrete construction. A vapor permeable, water-resistant building paper separates the plaster and lath from water-sensitive sheathing or framing.

Portland cement plaster has high impact resistance and sheds water, but breathes, allowing water vapor to escape. Exterior insulation finishing systems EIFS consist of a polymer-based laminate that is wet applied, usually in two coats, to rigid insulation board that is fastened to the wall with adhesive, mechanical fasteners, or both. Polymer based PB systems, sometimes known as thin coat, soft coat, or flexible finishes, are the most common. Exterior insulation finishing systems experienced performance problems in the s, including water leakage and low impact resistance.

While the polymer based skin repels water very effectively, problems arise when moisture gets behind the skin—typically via window, door, or other penetrations—and is trapped inside the wall. Trapped moisture eventually rots insulation, sheathing, and wood framing. It also corrodes metal framing and metal attachments. There have been fewer problems with EIFS used over solid bases such as concrete or masonry because these substrates are very stable and are not subject to rot or corrosion.

Clearly, portland cement plaster should not be confused with the exterior insulation and finish systems. The systems may share similarities in application techniques or final appearance, but the systems perform differently in resisting weather, especially wet conditions.

What are appropriate sheathing materials for plaster construction? Rigid sheathing materials are commonly used behind plaster finishes. They are directly attached to support studs then covered with building paper or other weather resistant barrier WRB. Metal lath attached over the sheathing and into the supports carries the plaster.

The weather resistant barrier is intended to resist water penetration, so the sheathing is protected from moisture. That means that many materials are suitable for this application, but the common ones remain plywood, oriented strand board OSB , cement board, and exterior grade gypsum sheathing. In the early s, basic research on stucco systems looked at the then-current practice of using board lumber not panels as sheathing.

These were commonly 6- to 8-inch wide boards attached to support studs at 45 degree angles. During that period, diagonal placement of the boards transitioned to horizontal placement, and was followed by a move to 4-byfoot panels. Both wood and metal lath were common substrates for plaster at least through the teen years of the s. It should also be noted that it is possible to place stucco over open frame construction.

This is accomplished by stretching line wires between studs and adjusting the wire to support paper as the backup to plaster. The paper is supported by the wire creating the backstop for plaster as it is applied to create the wall face. Because this is not as rigid as a board, the open frame method can allow for more variation in the thickness of the plaster. In addition it is important to understand that the open frame must be adequately rigid to resist deformation due to wind or other forces—that often means bracing the frame.

The stucco layer may not be considered as part of the stiffening system. Common sheathing materials today come in 4-byfoot boards. These are readily available building materials of consistent quality and are easy to install over wood or steel frames. The boards assure a more uniform thickness of the plaster layer and add structural rigidity to the building frame.

For a variety of reasons, then, the currently preferred practice in many regions is to use sheathing boards for frame construction. As noted above, sheets of plywood, oriented strand board OSB , cement board, and exterior gypsum sheathing are the most common materials for independent veneer plaster applications.

What are the correct proportions for stucco? Is there a difference between the coats? The brown coat is applied over the scratch coat to prepare the plaster base for the finish coat application. To start with, some systems are made up of two coats and some are three.

The three coats consist of two base coats and one finish coat. The first base coat is called a scratch coat, the second is called a brown coat.

In two coat work, there is a single base coat and a finish coat. The purpose of the first base coat, the scratch coat, is to embed the metal lath and provide a base for the brown coat. The scratch coat gets its name from the fact that it is physically scratched with horizontal marks. These scratches create a key; for the next coat to grab onto and a shelf for moisture to aid in curing of the brown coat. The brown coat covers the first base coat and creates a plane surface, leading to the best possible results for the finish coat.

The finish coat is the thinnest of the coats, and its purpose is to impart a decorative surface to the plaster. Scratch, brown, and finish coats all have slightly different proportions. Each one has a range that is allowed, but all are specified by volume. Another reason is that certain properties of the hardened plaster can be accentuated in each coat. The first coat will provide a hard base for the system without a great deal of shrinkage.

The greater sand content in the second base coat might generate less shrinkage to create a better base for the finish than the first base coat. The finish coat should be hard to resist abrasion and other surface damage. What type of cements can be used to make stucco? There are many types of hydraulic cements that can be used as a binder for stucco, or portland cement plaster.

A hydraulic cement is one that sets and hardens when mixed with water. Cement, along with sand and water, are the basic ingredients of a plaster mix.

The following materials are candidate binders for stucco:

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Slump Flow Test of Self-Consolidating Concrete (SCC) - ASTM C1611



Self consolidating concrete icf

Are plaster, stucco, and EIFS the same? While there are several parts of the North America where stucco always has a strong presence, there appears to be a general renewed interest in portland cement plaster for building finishes everywhere.

The answer requires a thorough explanation. Plaster is the general term for material that is applied to a wall surface in a thin layer. Portland cement-based plaster is such a material that uses portland cement as the binder. Portland cement plaster is applied either by hand or machine to exterior and interior wall surfaces in two or three coats. It may be applied directly to a solid base such as masonry or concrete walls, or it can be applied to metal lath attached to frame construction, solid masonry, or concrete construction.

A vapor permeable, water-resistant building paper separates the plaster and lath from water-sensitive sheathing or framing. Portland cement plaster has high impact resistance and sheds water, but breathes, allowing water vapor to escape. Exterior insulation finishing systems EIFS consist of a polymer-based laminate that is wet applied, usually in two coats, to rigid insulation board that is fastened to the wall with adhesive, mechanical fasteners, or both.

Polymer based PB systems, sometimes known as thin coat, soft coat, or flexible finishes, are the most common.

Exterior insulation finishing systems experienced performance problems in the s, including water leakage and low impact resistance. While the polymer based skin repels water very effectively, problems arise when moisture gets behind the skin—typically via window, door, or other penetrations—and is trapped inside the wall.

Trapped moisture eventually rots insulation, sheathing, and wood framing. It also corrodes metal framing and metal attachments. There have been fewer problems with EIFS used over solid bases such as concrete or masonry because these substrates are very stable and are not subject to rot or corrosion.

Clearly, portland cement plaster should not be confused with the exterior insulation and finish systems. The systems may share similarities in application techniques or final appearance, but the systems perform differently in resisting weather, especially wet conditions.

What are appropriate sheathing materials for plaster construction? Rigid sheathing materials are commonly used behind plaster finishes. They are directly attached to support studs then covered with building paper or other weather resistant barrier WRB. Metal lath attached over the sheathing and into the supports carries the plaster.

The weather resistant barrier is intended to resist water penetration, so the sheathing is protected from moisture. That means that many materials are suitable for this application, but the common ones remain plywood, oriented strand board OSB , cement board, and exterior grade gypsum sheathing. In the early s, basic research on stucco systems looked at the then-current practice of using board lumber not panels as sheathing. These were commonly 6- to 8-inch wide boards attached to support studs at 45 degree angles.

During that period, diagonal placement of the boards transitioned to horizontal placement, and was followed by a move to 4-byfoot panels. Both wood and metal lath were common substrates for plaster at least through the teen years of the s. It should also be noted that it is possible to place stucco over open frame construction. This is accomplished by stretching line wires between studs and adjusting the wire to support paper as the backup to plaster.

The paper is supported by the wire creating the backstop for plaster as it is applied to create the wall face. Because this is not as rigid as a board, the open frame method can allow for more variation in the thickness of the plaster. In addition it is important to understand that the open frame must be adequately rigid to resist deformation due to wind or other forces—that often means bracing the frame.

The stucco layer may not be considered as part of the stiffening system. Common sheathing materials today come in 4-byfoot boards. These are readily available building materials of consistent quality and are easy to install over wood or steel frames. The boards assure a more uniform thickness of the plaster layer and add structural rigidity to the building frame.

For a variety of reasons, then, the currently preferred practice in many regions is to use sheathing boards for frame construction. As noted above, sheets of plywood, oriented strand board OSB , cement board, and exterior gypsum sheathing are the most common materials for independent veneer plaster applications. What are the correct proportions for stucco?

Is there a difference between the coats? The brown coat is applied over the scratch coat to prepare the plaster base for the finish coat application. To start with, some systems are made up of two coats and some are three. The three coats consist of two base coats and one finish coat.

The first base coat is called a scratch coat, the second is called a brown coat. In two coat work, there is a single base coat and a finish coat.

The purpose of the first base coat, the scratch coat, is to embed the metal lath and provide a base for the brown coat. The scratch coat gets its name from the fact that it is physically scratched with horizontal marks. These scratches create a key; for the next coat to grab onto and a shelf for moisture to aid in curing of the brown coat. The brown coat covers the first base coat and creates a plane surface, leading to the best possible results for the finish coat. The finish coat is the thinnest of the coats, and its purpose is to impart a decorative surface to the plaster.

Scratch, brown, and finish coats all have slightly different proportions. Each one has a range that is allowed, but all are specified by volume. Another reason is that certain properties of the hardened plaster can be accentuated in each coat. The first coat will provide a hard base for the system without a great deal of shrinkage.

The greater sand content in the second base coat might generate less shrinkage to create a better base for the finish than the first base coat. The finish coat should be hard to resist abrasion and other surface damage. What type of cements can be used to make stucco? There are many types of hydraulic cements that can be used as a binder for stucco, or portland cement plaster. A hydraulic cement is one that sets and hardens when mixed with water. Cement, along with sand and water, are the basic ingredients of a plaster mix.

The following materials are candidate binders for stucco:

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1 Comments

  1. There have been fewer problems with EIFS used over solid bases such as concrete or masonry because these substrates are very stable and are not subject to rot or corrosion. To mould this structure, temporary scaffolding and formwork or falsework was built in the future shape of the structure.

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