Problem Clinic

  • Dealing with Cement Shortages

    Lots of things can disrupt the supply of cement but there are some things a ready-mix producer can do to mitigate the problem.

     
  • Onsite Additions for Concrete

    Take several precautions before making any concrete, starting with a trial batch under site conditions.

     
  • The Risks of Low-Cement Concrete

    What precautions should a producer take when making concrete with a ternary blend and only 25% cement?

     
  • Staffing agencies and host employers are jointly responsible for maintaining a safe environment for temporary workers.

    Protecting Temporary Workers: Whose Responsibility is It?

    OSHA recently launched an initiative to protect temporary workers from jobsite hazards. Here is what concrete producers need to know.

     
  • The environment, admixtures, cement, and supplementary materials can affect the window of opportunity for finishing concrete.

    Solving Concrete Finishing Problems

    Two factors impact the ability to finish concrete. The first is available paste in the mixture. The second is the window of time to allow finishing to be complete.

     
  • Should Superplaticizers be added at the Plant or the Jobsite?

    Adding water reducers, including superplasticizers, at the ready-mix plant doesn't limit the ability to measure and control slump. What factors determine where they are added?

     
  • Aggregate Moisture in Concrete

    The moisture condition of aggregate in concrete is very important. The absorption of the aggregate indicates the quantity of water which will be absorbed into the pore structure.

     
  • Preventing Slump Loss

    Many things can cause rapid slump loss. Aggregate, cement chemistry, fly ash sources, and admixtures are culprits.

     
  • Image

    RoMix + RO-396

    RO-396 High Performance Form Release Agent exceeds all VOC regulations and is easy to apply.

     
  • Image

    Coming Up Short

    QUESTION: We have a project where the contractor is constantly complaining we are shorting them on concrete. We have checked yield several times during placements and came up with good results. What should we do next?

     
  • Image

    It's About Time

    We are constantly battling time constrains on ready-mix deliveries and need help extending the time limits on some projects. We can maintain slump with water reducers easily beyond the 60 or 90 minutes allowed in the specifications. What advice can you offer?

     
  • Image

    Your Concrete's Air Content

     
  • Out of Plumb Precast Panels

     
  • Image

    Quality's Costs

    Q: I'm a quality control manager for a mid-size ready-mix producer and am dealing with several quality issues which need resolution. I am having difficulties convincing the owner that he needs to increase funding for the quality system in order to produce more consistent concrete. How can I...

     
  • Image

    Working With Your Lab

    Q: We are experiencing low compressive strength test results on some concrete we supplied to a job. We know it is due to poor testing of the cylinders. How do we convince the contractor and engineer where the issue is?

     
  • Image

    Testing for Air in Concrete

    We retrieved a piece of the material and an air-void analysis showed that the air content met the project spec. What happened?

     
  • Image

    Is Your Aggregate Alkali-Silica Reactive?

    Q: We received a request to submit proof that our aggregates are not alkali-silica reactive. We've never seen this type of request before in our area. They required ASTM C1260 testing, which we completed and failed. What do we do now?

     
  • Image

    Tread Lightly When Going Green

    Q: We operate in an area that does not have many LEED projects. However, we are now seeing more such projects under development, and specifications requiring LEED submittals are becoming more frequent. How can we manufacture concrete to meet these requirements, and how can we make our concrete more...

     
  • Image

    Making a Quality Hire

    Q: We are a small but growing ready-mix producer. We have just decided to open a portable plant to service a multiyear project. We are considering hiring a full-time quality control manager. At what annual production volume does it make sense to make this hire?

     
  • Image

    Lightweight Block As An Alternative

    Q: We are working on a project where the owner is trying to earn LEED credits. So we are trying to convince the structural engineer to use lightweight block. How can we get him to use lightweight block as an alternative?

     
 
 
 
 
 

TCP's Network

Twitter Facebook LinkedIn