ASTM C1761/C1761M − 15 Standard Specification for Lightweight Aggregate for Internal Curing of Concrete

ASTM C1761/C1761M − 15 Standard Specification for Lightweight Aggregate for Internal Curing of Concrete

Scope
1.1 This specification covers lightweight aggregate intended to provide water for internal curing of concrete.

It includes test methods for determining the absorption and desorption properties of lightweight aggregate.

NOTE 1—Internal curing provides an additional source of water to sustain hydration and substantially reduce the early-age autogenous shrinkage and self-desiccation that can be significant contributors to early-age cracking.

Appendix X1 provides guidance on calculating the quantity of lightweight aggregate for internal curing.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Combining values from the two systems may result in non-conformance.

Some values have only SI units because the inch-pound equivalents are not used in practice.

ASTM C1761/C1761M − 15 Standard Specification for Lightweight Aggregate for Internal Curing of Concrete

Terminology
3.1 Definitions:

3.1.1 For definitions of terms used in this practice, refer to Terminology C125.

3.2 Definitions of Terms Specific to This Standard:

3.2.1 absorption, A72, n—of lightweight aggregate, the increase in mass of a specimen of oven-dry lightweight aggregate due to water penetrating into the permeable pores of the particles after being submerged for 72 h, expressed as percentage of oven-dry mass.