- What is aggregate? - American Concrete Institute
What is aggregate? A What is aggregate? A Aggregate is granular material, such as sand, gravel, crushed stone, crushed hydraulic cement concrete, or air-cooled iron blast-furnace slag, used with hydraulic cement to produce either concrete or mortar It is divided into two groups by size, as coarse aggregate (material retained on the 4 75-mm (No 4) sieve), and fine aggregate (material
- Aggregates for Concrete
Synthetic aggregates may be either byproducts of an industrial process, in the case of blast-furnace slag, or products of processes developed to manufacture aggregates with special properties, as in the case of expanded clay, shale, or slate used for lightweight aggregates Some lightweight aggregates such as pumice or scoria also occur naturally
- ACI 213R-14 Guide for Structural Lightweight-Aggregate Concrete
This guide includes a definition of lightweight-aggregate concrete for structural purposes and discusses, in a condensed fashion, the production methods for and inherent properties of structural lightweight aggregates Current practices for propor-tioning, mixing, transporting, and placing; properties of hardened concrete; and the design of structural concrete with reference to ACI 318 are all
- PowerPoint Presentation
5 4 1 Use of Non-Reactive Aggregate Most obvious and certain (?) way of preventing deleterious AAR Nonreactive aggregates are not available in many locations AAR has occurred with aggregates that test to be “non-reactive” It may be prudent to take further precautions even with “non-reactive” aggregates
- aggregate Topic - American Concrete Institute
Aggregates are the major constituent (ingredient) in concrete, making up 60% to 70% of the volume of concrete Aggregates influence the workability of plastic concrete and also the durability, strength, thermal properties, and density of hardened concrete Particle size divides aggregates into two categories: fine and coarse Most fine aggregates are sand and contain particles smaller than 3 8
- How can the surface or free water carried by the aggregates be determined?
Q How can the surface or free water carried by the aggregates be determined? A Free water is simply the difference between the mass of a sample of wet-saturated aggregate and the mass of the same sample in the saturated-surface-dry condition Standard test methods for surface moisture in fine aggregate are available (ASTM C70)
- topicdetail - American Concrete Institute
The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification 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
- What is an admixture? - American Concrete Institute
What is an admixture? Q What is an admixture? A An admixture is a material other than water, aggregates, cementitious materials, and fiber reinforcement, used as an ingredient of a cementitious mixture to modify its freshly mixed, setting, or hardened properties and that is added to the batch before or during its mixing
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