Uncategorized

Tips For Getting the Right Concrete Additive

When you are in the market for a concrete additive, it’s important to consider a few things before making a purchase. In this article, you will learn about PVA, SBR, and Accelerators. Depending on what you’re looking for, you may need one of these different types of additives or a combination of both. The best way to choose the right product is to ask as many questions as possible.

Accelerators

When selecting the right concreters, consider the following tips. Most accelerators are chloride-based, meaning that they are cheap but can also be very corrosive. On the other hand, nitrites are more efficient but also cost more, so you should use the latter unless your budget allows for a less corrosive alternative. Calcium chloride is the most common accelerator used in concrete, but you may also want to try calcium formate, which is slightly less corrosive.

Adding to the mix: Using admixtures to get your concrete to do what you  want it to - On-Site Magazine

Superplasticizers

Adding superplasticizers to concrete can increase its strength and reduce its capillary porosity. The latter is responsible for the durability and longevity of concrete. However, the presence of superplasticizers can compromise the efficacy of SPs, which are costly and may not be suitable for all applications. For these reasons, using a combination of superplasticizers and FRCA is an ideal sustainable solution. It is recommended that concrete that has a low capillary porosity be mixed with high-performance SPs.

PVA

Polyvinyl alcohol, or PVA, is a water-soluble polymer. It has excellent mechanical properties and is widely used as an aggregate-surface pretreatment agent, fiber reinforcement, and cement modifier. PVA is an excellent concrete additive because it can be easily added in small quantities without compromising the chemical composition of the cement mix. It is not water-resistant, and may even become slightly alkaline in wet conditions, making it an inappropriate additive for some applications.

SBR

SBR is a polymer that is added to cement in order to improve the characteristics of the concrete. The polymer film suppresses the initial hydration reaction of the cement. In studies, SBR-modified cementitious mixtures were found to have a delayed setting time compared to the cement-only control samples. This property improves the open time of the concrete, which is an important factor for 3D construction.

Air-entrained concrete

To achieve consistent and high levels of air-entrained air in concrete, the dose of air-entrained admixtures should be adjusted to match the particular mix characteristics. The amount of AEA needed depends on the fineness of the aggregate, the concrete mix consistency, and the proportion of water to cement in the mixture. The dosage of AEA must be adjusted accordingly at the plant to optimize air entrainment.

Admixtures with dyes

There are many different types of concrete dyes. Water-based or solvent-based, they can be found in powder, solution, or liquid concentrate. While the range of possible colors is virtually endless, you should be aware that these products do not hold up to ultraviolet light, so they are better kept for interior projects. It is also important to use a UV sealer when using concrete dyes. Listed below are some tips to help you choose the right concrete additive with dyes.

Admixtures with fibres

There are several different types of concrete admixtures available on the market. These include accelerators and set retarders. Typically, you’ll find a combination of both in your mix. While you can choose the type that suits your needs, it’s important to know that some will have different effects. For example, accelerators increase the rate at which the concrete cures, while fibres reduce its shrinkage.