Aci 213r-14 Pdf Jun 2026

Structural lightweight aggregate concrete (LWAC) is a vital material in modern construction. It allows engineers to reduce structural dead loads, optimize foundation designs, and improve thermal insulation. The American Concrete Institute (ACI) standardizes the usage of this material in its document .

The cellular structure lowers the crushing strength compared to natural gravel, which influences the maximum compressive strength of the concrete. Core Mechanical Properties of LWAC

| Property | Typical Criteria for Structural Use | | :--- | :--- | | | 1440 to 1850 kg/m³ (90 to 115 lb/ft³) | | 28-Day Compressive Strength | Minimum 17.0 MPa (2500 psi); Common range 21 to 35 MPa (3000 to 5000 psi) | | Unit Weight | Less than 2000 kg/m³ for many structural applications | | Tensile Strength | Varies, but typically lower than normal-weight concrete of equivalent compressive strength | | Modulus of Elasticity | Lower than normal-weight concrete; dependent on density and strength | | Shrinkage | Often similar to or lower than normal-weight concrete | | Fire Resistance | Superior to normal-weight concrete due to lower thermal conductivity |

: Enhanced information on internal curing—a process where saturated lightweight aggregates provide moisture to the cement paste from the inside out—which helps reduce shrinkage and cracking.

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Designing with lightweight concrete requires adjustments to standard structural formulas. ACI 213R-14 highlights several unique mechanical profiles: Compressive Strength

8.1 General Regular maintenance and repair of concrete structures can help to extend their service life.

Reduced dead loads can lead to smaller foundations and supporting members.

A minimum 28-day compressive strength of 17 MPa (2500 psi). Structural lightweight aggregate concrete (LWAC) is a vital

The "14" in the title signifies that the document was approved and published in 2014. It updates previous versions to reflect contemporary testing methods, manufacturing techniques, and structural design codes (such as ACI 318). Definition of Lightweight Concrete

LWAC generally exhibits lower splitting tensile strength than normalweight concrete of equal compressive strength. ACI design codes introduce a modification factor (

Designing with structural lightweight concrete requires modifications to standard ACI 318 structural concrete codes. ACI 213R-14 highlights several key mechanical differences: 1. Modulus of Elasticity ( Eccap E sub c

To fully implement these guidelines into structural calculations or specific job site workflows, sourcing the authorized directly from the American Concrete Institute ensures adherence to current engineering standards. The cellular structure lowers the crushing strength compared

The PDF is also sold through authorized standards resellers. While convenient, be sure to verify these sources are legitimate. Examples include:

| Property / Consideration | Key Provision or Value from ACI 213R-14 | | :--- | :--- | | | Air-dry unit weight of 1440–1850 kg/m³ (90–120 lb/ft³) | | Strength Range | Typically 21–35 MPa (3000–5000 psi); higher possible | | Modulus of Elasticity | Provides equations to estimate lower elastic modulus vs. normal-weight concrete | | Shrinkage & Creep | Discusses how LWA's internal curing can reduce drying shrinkage | | Shear Strength | Lower shear capacity than normal-weight concrete at same strength | | Thermal Conductivity | Superior fire resistance and insulation properties |

: Best practices for handling, placing, finishing, and curing lightweight concrete to prevent common issues like aggregate floatation or moisture loss. Durability

Minimum 2,500 psi (17 MPa), though commercial applications frequently exceed 4,000 to 6,000 psi. 2. Types and Production of Lightweight Aggregates