What Causes Color Variations in Precast Concrete?

Precast concrete panels come in an unlimited range of variants that allow for all kinds of design concepts and architectural styles. They also enable unprecedented construction versatility, as they come in many sizes and shapes. 

The material allows engineers to develop and control its mass, form, color, and texture, so clients can order bespoke panels for their individual use cases.

Choosing the right color, form, and texture for a building’s exterior is an important factor when it comes to creating a desirable aesthetic for it. The building’s appearance depends on the architect’s use of light and shadow, as well as the intensity of nearby colors in its surroundings. 

Precast concrete panels can be made in multiple colors, which is achieved through factors such as cement influence, aggregate exposure, chemical admixtures, and a few other finishing processes. 

Let’s look at each one.

Influence of Cement

Variations in cement type can heavily influence the color of precast concrete panels. The tone of a panel varies due to the composition of minerals in the cement. 

In order to avoid color pigmentation, architects advise that residential and commercial customers use the same type and brand of cement for all concrete in a given structure.

Aggregate Exposure

Aggregate is an inert granular ingredient and is a primary constituent of precast concrete. The overall color and appearance of precast panels can be manipulated by the color of the aggregate particles. 

If the customer requires a striking appearance, selecting certain pigments and aggregates can create a dynamic precast concrete. Both quantities of fine and coarse aggregates should be carefully controlled during the process to prevent discoloration. 

  

Curing Colored Concrete

In order to maintain color uniformity, proper curing is essential for precast colored concrete. Wet curing can have adverse effects on the color; hence, caution is advised during the application process. 

Color uniformity can be maintained by sandblasting after curing, but this may result in a slightly dull appearance. Precast concrete manufacturers can also deepen the color by using special curing compounds.

Chemical Mixtures and Pigments

Admixtures containing calcium chloride can cause discoloration in colored cement. Moreover, some other coloring agents have a tendency to reduce the air content in the precast concrete, which may require adjustment in the air-entraining agent. The best way to keep a check on these factors is to conduct a slab test before using several concrete panels on the job. 

Pigments are prepared to produce color, without losing the desirable properties of concrete. But they also affect physical properties of hardened concrete if mixed in a ratio that’s more than the weight of the concrete itself. Precautions should be taken in order to produce a fine architectural colored concrete. 

All of these factors should be taken into consideration while coloring precast concrete panels. If you’re looking to add strength and durability to the structure of your home, get in touch with Mohan’s Precast at 718-7399-199 and partner up with a precast concrete expert for a lasting construction project. 

The company specializes in providing precast concrete and cast stone structural elements to both commercial and residential customers across New York. They have been in the industry for more than a decade, and turn clients’ dream projects into reality.