scope:

GENERAL

Definition of cellular concrete

Low-density cellular concrete (Fig. 1.1) is defined as concrete made with hydraulic cement, water, and preformed foam to form a hardened material having an oven-dry density of 50 lb/ft³ (800 kg/m³) or less. These mixtures may include aggregate and other material components including, but not limited to, fly ash and chemical admixtures.

This guide provides data and techniques pertaining to the properties and applications of cast-in-place low-density cellular concrete. Common applications of cast-in-place low-density cellular concrete are on roof decks and geotechnical applications. On roof decks, the material provides roofing base, thermal insulation, and drainage slope for flat-roofed industrial and commercial buildings (Fig. 1.2).

In geotechnical applications, the material is applied in thick sections of cellular concrete with low compressive strengths (Fig. 1.3) for the replacement of poor soils, fills for abandoned structures (pipelines), and cellular concrete fills designed, mixed, and placed to meet specific job conditions and functional requirements.

Definition of low-density, controlled low-strength material (LD-CLSM)

Controlled low-strength material (CLSM) is a cementitious material that is in a flowable state at the time of placement, and that has a specified compressive strength of 1200 psi (8.3 MPa) or less at the age of 28 days. This material is discussed further in ACI 229R. Low-density CLSM (LDCLSM) meets this definition, and has a cast density that is controllable from 20 to 50 lb/ft³ (320 to 800 kg/m³). The quantity of preformed foam in the mixture determines the mixture's final density.