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Concrete Knowledge Center - Technical Questions  
   

Topics
Displaying the 3 most asked questions per topic.
Click on a topic to display its top most asked questions


ACI Documents
General information on ACI reports, guides, specifications, test methods, codes and the standardization process
Referencing ACI documents in specifications
ACI Reference Specifications
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Decorative
Issues related to decorative unformed finishes, including: polished, exposed aggregate, stained, and stamped surfaces
Other decorative concrete information sources
Effects of coloring pigments on setting time and air content
Minimizing color variations in decorative concrete
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Floors
Floor and slab on ground issues related to placement, finishing, and curing
ACI standards for floor finishes
Floor finish tolerances — F-numbers versus the 10 ft straightedge method
Fibers and welded-wire reinforcement in slabs-on-ground
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Formwork
Issues related to specifing formed finishes and erecting formwork
Classes A, B, C, and D — formed surfaces
Stripping time for forms
Veins in Aluminum-Formed Walls
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Placement
Concrete construction placement issues, including: weather, ready mixed concrete, site conditions
Maximum temperature limits for hot-weather concreting
Limits on free fall of concrete
Adjustment of Entrained Air at the Job Site
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Repair
Repair of concrete including overlays
Resurfacing a worn concrete floor
Cement-based repair materials
Durability - Carbonation
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Residential
Issues related to concrete used in residential construction, such as slabs-on-ground and foundation walls
Slab-on-ground design
Foundation wall design
Other residential concrete information sources
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Sustainability
Concrete as a sustainable construction material: green construction and LEED™ Certification information
Earning LEED™ points with concrete
ACI information on sustainable development
LEED™ Certification
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Testing
Testing and evaluation of concrete and concrete applications
Estimating in-place concrete strength
Standards for 7-day and 28-day strength test results
Curing strength-test cylinders
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Thermal
Effects of temperature on concrete, including: fire ratings, mass concrete.
What is mass concrete?
Concrete cover required for specific fire rating
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Chapter 12
Development and splices of reinforcement
Development Length Calculation
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Chapter 4
Calcium Chloride Admixtures
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