More stories about Ready-Mixed Concrete

  • A Wisconsin Legend

  • Does New Standard Carry Water?

    As a producer, how can I use the recent changes in ASTM standards to use process water in my concrete? Promoting using process water in concrete is a tedious effort. We turned to three experts to answer this important question. The answer below is supplied by Richard S. Szecsy, PhD, PE, vice...

  • How Long Should it Take?

  • Defining Transportation Unit

    How long must concrete be protected from freezing temperatures, with and without accelerators or admixtures? ASTM’s ready-mixed concrete specification says, “air content of air-entrained concrete when sampled from the transportation unit at the point of discharge” is to be within 1.5% of the...

  • What's in a Name?

  • Concrete Too Salty?

    Does the water for concrete have to be completely void of salt (from seawater)? What happens if it is not?

  • Rev Up Your Engines

  • Insight on C Mixes

    I have an answer for the definition of a C-4 mix (ôDesign Specs for a C-4 Wall,ö February 2002. IÆm working with a concrete contractor who is pouring C-4 for his footings in the morning, setting wall forms, and pouring them with C-4 that same day in winter conditions. What is your opinion of this...

  • What's the Allowable Fly Ash Limit?

    What is the highest percentage of fly ash that can be used in ready-mixed concrete? Is durability the most important issue in determining the limit?

  • Does Intermediate Rounding Decrease Accuracy?

    I have a further question regarding the rounding of compressive strength results (ôHow Precisely Should Labs Round off Compressive Strength Results?ö April, page 26).At our lab, we test 4x8-inch and 6x8-inch concrete cylinders for compressive strength, and we round to the nearest 10 psi according...