Aci 213r-14 Pdf — [updated]

The ACI 213R-14 is a guide published by the American Concrete Institute (ACI) titled "Guide for Structural Lightweight-Aggregate Concrete." It serves as a comprehensive technical summary of the technology, properties, and design practices for structural lightweight concrete. Key Technical Specifications

1.3 Definitions For the purposes of this guide, the following definitions apply: aci 213r-14 pdf

4.4 Supplementary Cementitious Materials (SCMs) The use of SCMs can affect the durability of concrete. The ACI 213R-14 is a guide published by

3.2 Service Life The service life of a concrete structure should be considered during the design process. Seismic Design (Zone 4): For buildings in California

• Seismic Design (Zone 4): For buildings in California or Japan, reducing dead load by 30% reduces seismic forces proportionally. This allows for smaller shear walls and less rebar.
• Longer Spans: In parking garages or high-rise office towers, reducing the self-weight allows for longer spans between columns, resulting in more rentable space.
• Shipping/Handling: For precast concrete elements (hollow core planks, wall panels), lighter products mean cheaper shipping costs and smaller crane requirements.

• Water Demand: Due to aggregate absorption, the water demand is higher.
• Pre-soaking (Pre-wetting): The guide discusses the necessity of pre-wetting aggregates to control slump loss and ensure adequate curing water, or using "dry-batched" methods.
• Cement Content: Typically requires slightly higher cement content to achieve the same strength as normal-weight concrete due to the lower aggregate stiffness.

3. Mixture Proportioning (Chapter 5)

This is the most dog-eared section in any physical copy. It walks the engineer through the Trial Batch method. It addresses the unique problem of lightweight aggregate: Absorption. Because LWA is porous, it absorbs mixing water. The ACI 213R-14 guide explains the concept of "absorption and surface moisture" and warns against using too much water, which leads to segregation (the lightweight particles floating to the top).