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Concrete Casting News from the Hill and Griffith Company

Concrete Forms - Types and Selection of Concrete Forms

Posted by Hill and Griffith Company on May 1, 2020 4:24:36 PM

Excerpt from the instructional website, The Constructor.

Bond Breakers

Concrete forms can be defined as a solid barrier that helps to hold the fluid concrete in place until it hardens and acquire a particular shape. The concrete takes the shape of the form or the mold in which it is contained. Now new concrete form systems are developed that provides additional properties like insulation, surface patterns and effects to the concrete cast.

The different types of concrete forms used in concrete casting are:

  1. Wooden Forms
  2. Insulated Concrete Forms
  3. Foam Concrete Forms
  4. Concrete Wall forms
  5. Steel Forms
 
Wooden Concrete Forms

Wooden Concrete Forms

Wooden form is the basic and the most conventional type of concrete form. It is employed mainly for concrete casting that does not exceed 6 inches of height. The wooden form types consist of wooden boards. These are either nailed or screwed together to the desired mold or formwork shape. Special leveling devices are used to properly level or slope the form based on the requirement.

In order to cast concrete with curves or any sort of free-form designs, thinner cross-sections are employed to make the form. Before pouring concrete, the inner surfaces are applied with low-grade oil or any form releasing agent so that concrete does not stick to the surfaces.

If properly cleaned and maintained, these forms are suitable for multiple uses.

Insulated Concrete Forms

The insulated concrete forms (ICF) compromises of hollow blocks made of insulating material that is fit together like building blocks as shown in figure-2. These systems are constructed on the foundation slab. This forms a part of the foundation and the wall systems. Reinforcement is placed within these blocks and filled with concrete of required slump and cast. The form and concrete are placed like a sandwich. This system provides high energy efficiency. Removal of forms is not necessary by implementing ICFs. Once the concrete is filled it need not be removed.

Insulated Concrete Forms

Read More


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

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Bulletins and Technical Papers for Concrete Casting Products

 

Tags: Concrete Form Release Agents, Biodegradable Concrete Form Release, Concrete Release Agents, Concrete Forms, Concrete Form Seasoning, Concrete Casting Supplies, Concrete Pipe, Concrete Form Release, The Constructor Magazine

Formwork Lubricants - Types and Uses of Release Agents for Formworks

Posted by Hill and Griffith Company on Feb 13, 2020 4:51:40 PM

Excerpt from The Constructor Magazine by Kavita Pai

Concrete formwork lubricants are high-quality form seasonings that are applied to the inner surface of a formwork before pouring concrete. Formwork lubricants are also known as form or mold release agents.

Uses of Formwork Lubricants

Release Agents are used for the following reasons:

  1. Application prevents sticking of formwork to the concrete surface thereby permitting easy stripping of formwork after the concrete has hardened.
  2. Protects the formwork and hence the formwork can be reused several times.
  3. Provides good finishing surface of the concrete with minimum defects.
  4. In the case of wooden formwork, prevents water absorption from concrete by the wooden formwork.
  5. Reduces leakage of water during the curing process.
  6. Prevents steel formwork corrosion.

Precast Concrete Form Seasoning 2

The performance of release agents are largely dependent on the type of formwork used. For wooden formwork, straight refined, pale, paraffin-based mineral oil and oil-phase emulsion have been successfully used. The oil that is chosen should be capable of penetrating the wood to some extent while leaving the surface slightly greasy to touch.

There should not be any free release agent on the wood surface. The form release agents that are good for wooden formwork are not always suitable for steel formwork. And hence the choose form release agents based on the type of formwork used for construction.

 

Types of Release Agents:

1. De-Shuttering Oil (DSO)

This is a water-based mold release agent, which produces clean and stain-free, high-quality concrete. It is available in a sprayable form and ready to use as a direct application on required places. It should be applied in light film either by brush or sprayer. If it is over applied, excess release agent should be drained before it dries. Pools of DSO cannot be allowed to dry as it causes surface retardation of concrete.

Advantages of De-Shuttering Oil are as follows:

  • DSO is economical to use.
  • It is non-toxic and non-hazardous.
  • It can be used for all types of concrete formworks.
  • It helps reduce the cleaning efforts before reusing of the formwork.
  • DSO provides a damp proof interface that protects the formwork and ensures even texture and color of concrete.

Read More


More News The Constructor Magazine

Concrete Sweating – Phenomenon, Causes and Prevention

Pre-Concrete Checks for Formwork and Release Agents


Hill and Griffith Customer Service

We're known for our hands-on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water and non-petroleum concrete form release, biodegradable releases, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

Tags: Concrete, Concrete Form Release Agents, Biodegradable Concrete Form Release, Concrete Casting Products, Concrete Release Agents, The Constructor Magazine

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