Frequently Asked Questions
Cement & Concrete Technology Home > FAQs

Q: How much cement is needed for a small concrete mixture?
Q: What are the unit weights (densities) of cement and concrete?
Q: On what basis is air content for concrete specified?
Q: What are advantages and disadvantages of the different air tests?
Q: Can we add air-entraining admixture at the jobsite?
Q: What is meant by "saturated surface dry condition" of aggregates?
Q: How can I test for alkali-silica reactivity (ASR)?
Q. What differences can I expect in the behavior and properties of recycled-aggregate concrete compared to concrete made with natural aggregates?
Q: Can I use fibers instead of wire mesh for a concrete slab?
Q: What precautions do I have to take during cold-weather concreting?
Q: What precautions do I have to take during hot-weather concreting?
Q: How do I design for moisture sensitive floor coverings?
Q: What can I do against moisture problems in a new concrete building?
Q: Can rebound hammer reliably measure compressive strength?
Q: Joints: What types are used and where?
Q: What causes concrete to crack?
Q: What effects do deicers have on concrete?
Q: How are fire resistance ratings for concrete determined?
Q: How are exposed-aggregate concrete finishes produced?
Q: What causes efflorescence and how can it be avoided?
Q: Does muriatic acid darken concrete?
Q: How can I remove graffiti from concrete?
Q: What could have caused dark spots in a driveway?
Q:What are supplementary cementitious materials (SCMs) and how do they differ from blended cements?

 
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