Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
Home > Tools > Frequently Asked Questions
Question: Why is a plastic consistency usually desirable for placing concrete?
Question: How do the requirements of placing affect the selection of proportions of aggregates and cementi...
Question: Can the importance of proper consistency for placing be overemphasized?
Question: How is the selection of mixture proportions affected by the materials to be used and the placing...
Question: Heat of hydration and the importance of controlling it
Question: Maximum temperature limits for hot-weather concreting
Question: What range in slump is recommended for various types of construction?
Question: How is concrete consolidated?
Question: How to Control Mass Concrete Temperature during Construction
Question: What is mass concrete?
Question: If the paste is ample in amount, but is too thin and watery to float the aggregate particles, wh...
Question: How should the concrete be consolidated to obtain a complete filling of the forms and around the...
Question: Does over-vibration cause segregation and loss of air content?
Question: What is the importance of consolidation on strength?
Question: Consolidation of concrete—required or not?
Question: Requirements for durable concrete
Question: The effect of pozzolans on water demand
Question: Requirements for storing and handling aggregate
Question: Why is the workability of concrete important?
Question: How is workability measured and specified?
Question: The ultimate objective in proportioning concrete
Question: What consideration should be given to water that may be lost from concrete between the time it l...
Question: How can segregation of the concrete between the mixer and its final point of placement be prevented?
Question: If the cementitious material paste is not sufficient in amount to float all of the aggregate par...
Question: Can you have too much paste or mortar?
Question: What are the essential requirements of consistency?
Question: How is concrete placed?
Question: Why is consolidation needed?
Question: What is the purpose of finishing and texturing concrete surfaces?
Question: When can the finishing procedure be started?
Question: What is curing?
Question: What is meant by properly cured concrete?
Question: Is there any measure of the completeness or adequacy of curing?
Question: What methods are commonly used to ensure sufficient moisture for curing concrete?
Question: How does the temperature influence curing?
Question: What is the effect of freezing on concrete?
Question: What methods are used for protecting concrete against low temperatures?
Question: Can the heat liberated by the hydrating cement be relied on to give protection during cold weather?
Question: When heated enclosures are used to protect freshly placed concrete, what precautions are necessary?
Question: When water and aggregate are heated, are any limitations necessary?
Question: Are any temperature limitations necessary in curing concrete in hot weather?
Question: How can the effectiveness of curing be measured?
Question: What is the importance of curing on strength?
Question: Does additional curing improve the properties of concrete in other ways than in strength?
Question: What is architectural concrete?
Question: Tolerances for floors supporting operable partitions
Question: Decorative concrete finishes
Question: Placement of welded wire reinforcement (WWR) in a slab-on-ground
Question: Tolerances for concrete slabs supporting steel tanks
Question: Standard on detailing of concrete reinforcement
Question: When is steam curing used?
Question: What test conditions affect the results of compressive strength tests of concrete?
Search other resources on the ACI website for answers to technical questions