Verifi Concrete Quality Blog

Admixture in Transit: What Contractors Need to Know

by Verifi

Concrete producers can use Verifi to add concrete admixtures, such as superplasticizer, to the truck to maintain slump from batching to discharge. Concrete admixtures can be added in transit, so that the concrete arrives on site at the ordered slump and ready to pour. Here are a few things to keep in mind when pouring concrete with Verifi admixture additions.

  1. Superplasticizers increase slump without reducing concrete quality. You can get the slump you want without reducing strength.

  2. Ask for higher slump, not more water. When the slump is lower than desired, most contractors ask for more water: “Give me 20 gallons!”  For concrete trucks with Verifi, ask for higher slump. Verifi will automatically calculate and add the right amount of water or admixture to add to provide the slump you request.

  3. Admixture choice matters. Concrete producers have access to numerous admixtures to help tailor concrete performance to the application. Admixtures are selected based on factors including setting time, strength development, pumpability, and finishability. The right admixture can make a huge difference.  Likewise, the wrong admixture can make for a miserable experience. Verifi works closely with concrete suppliers to select the right admixture.

  4. Ensure concrete is mixed after superplasticizer addition. Superplasticizers require a certain number of revolutions to be fully mixed into the load. Verifi shows the driver the amount of mixing required to ensure concrete is fully mixed. This mixing can occur during transit at agitation drum speed. If done at the jobsite at high drum speed, mixing typically requires 2 minutes or less.

  5. Expect consistent setting time. Adding water to concrete delays setting time. Superplasticizers can be chosen to increase slump without affecting setting time.

  6. Expect better pumpability and finishability. Additions of superplasticizer typically result in better concrete rheology than mixes with water added, which means concrete is less likely to segregate and is easier to pump and finish.

concrete admixtures in transit Verifi

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