More stories about Water-Cement Ratio

  • Causes of crazing in architectural precast

    What causes crazing on architectural precast products? Does it affect structural integrity, or is it just an aesthetic problem? How do you minimize it without sacrificing the 5000-psi compressive strength usually specified for architectural precast products?

  • Using water reducers in cold weather

    My belief is that increasing the cement content in mixes designed for placement in conditions below 32° F is counterproductive to initial strength gain due to the additional hydration required to generate heat. We use a Type III cement and generally deliver concrete at 60° F at time of placement...

  • Why 0.35 w/c for 4000-psi concrete?

    When pricing concrete, our salespeople have a problem with projects for which there are conflicting specification requirements. Some engineers and architects in our area specify both compressive strength and maximum water-cement ratio, but the water-cement ratios are ridiculously low for the...

  • Cures for paver efflorescence

    We manufacture concrete pavers and are experiencing a severe efflorescence problem. Can we reduce efflorescence by using admixtures such as plasticizers or pozzolans? Or should we use silicone-type water repellents or film-forming sealers on the finished product?