Internet Special: NRMCA Adds Two More Topics to TIP Series

NRMCA's Technology in Practice series covers brief technical topics in the popular "What?, Why? And How?" format and are developed as educational topics for ready mixed concrete industry technical personnel. The topics are selected and developed by the NRMCA Research, Engineering and Standards (RES) Committee. NRMCA has released two more topics in the series:

TIP 9 – Density of Structural Lightweight Concrete – discusses the relationship between oven-dry density, equilibrium density and fresh bulk density of lightweight concrete. The density of lightweight concrete is critical when used for design load on structural members, fire rating of building assemblies and overall mass of a structure in seismic conditions. The TIP discusses procedures used in ASTM C567 to calculate or measure the density of lightweight concrete in different moisture conditions and to develop information required in project submittals.

TIP 10 – Mixing Water Quality for Concrete – addresses the process of qualifying non-potable sources of water, such as well water or mixer wash water, for use as mixing water in concrete. It discusses the details of ASTM C1602, Specification for Mixing Water and the testing requirements to qualify non-potable sources of water for use in concrete.