According to ACI standards, structural lightweight concrete must meet two specific criteria:
Because lightweight aggregates absorb water before mixing, they act as tiny internal reservoirs. As the concrete hydrates and dries, these pores release water internally. This minimizes autogenous shrinkage and reduces micro-cracking, leading to a highly durable, low-permeability matrix. Thermal Efficiency and Fire Ratings
Special considerations for ensuring consistent quality. 5. Transporting, Placing, and Finishing Handling: Strategies to minimize aggregate segregation.
Meeting these specifications allows engineers to leverage the material's lower self-weight for significant structural benefits, such as reduced dead loads, smaller foundation sizes, and improved seismic performance.
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: Must have a minimum 28-day compressive strength of 2,500 psi (17 MPa) .
Following the ACI 213R-14 guidelines offers significant benefits in construction projects:
| 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 |
2.2 Material Factors Material factors can also affect the durability of concrete. Some of the most common material factors that can affect concrete durability include: Structural Design Considerations (ACI 318 Alignment)
A minimum 28-day compressive strength of 17 MPa (2500 psi).
Providing guidelines so structures can be designed with the same reliability as normal-weight concrete.
ACI 213R-14 PDF covers a wide range of topics related to structural lightweight concrete, including:
Engineers, architects, and contractors frequently search for the to understand how lightweight aggregate concrete (LWAC) differs from normalweight concrete (NWC). This comprehensive guide breaks down the core concepts, structural benefits, mix design principles, and mechanical properties detailed in ACI 213R-14. 1. What is ACI 213R-14? tensile capacity is slightly lower.
The ACI 213R-14 guide is structured to take the reader from foundational concepts through to advanced design applications. The following table provides a breakdown of its key chapters:
This factor directly modifies equations governing shear strength, torsion, and reinforcing bar development lengths. Deflection and Creep
) applied to lightweight concrete when calculating shear and development lengths. Because lightweight aggregates can shear through the particle rather than around it, tensile capacity is slightly lower. Structural Design Considerations (ACI 318 Alignment)