Precast vs Site cast Concrete

What is Precast Concrete?

Precast Concrete is poured and moulded (form) over rebar or wire and then cured offsite. This involves pouring concrete into pre-made moulds and cured under optimal conditions within the manufacturing plant.

The products are then shipped to the job site where they are assembled.

What is site-cast concrete?

Site-cast concreted is poured, moulded and cured on site. Just as precast concrete, on-site concrete is formed in a mould and then erected in place. One of its benefits over precast slabs is that it doesn’t need to be moved far to be lifted into place. Lastly, precast concrete requires more joints and, therefore, makes it less acceptable for earthquake-prone areas. 

Comparing Precast vs. Site Cast Concrete

The most reliable means to see just how great precast concrete is to highlight the differences between precast and site-cast concrete directly. Here are some critical aspects between the two methods placed side-by-side.

Precast Concrete – Prep Work 

• Excavate the land as required.

On-site poured concrete

• Required excavation and on-site forms to be designed and installed.

Precast Concrete – Weather 

• Utilizes a controlled environment; the climate does not present a factor in forming.

On-site poured concrete

• Unexpected weather circumstances will hinder progress. Cold weather can append cure time.

Precast Concrete –  Strength 

• Stringent strength requirements are met before leaving the plant. Consistency across all precast materials.

On-site poured Concrete

• Variables factor into your final product: temperature, wind, humidity etc. can affect final strength.

Precast Concrete – Quality control 

• The controlled environment prevents any external variables. All concrete must pass rigorous testing. Ideal conditions are maintained.

On-site poured concrete

• Concrete is subjected to external variables and varying conditions. All testing requirements must be performed on-site.